From: owner-utah-astronomy-digest@lists.xmission.com (utah-astronomy-digest) To: utah-astronomy-digest@lists.xmission.com Subject: utah-astronomy-digest V1 #11 Reply-To: utah-astronomy-digest Sender: owner-utah-astronomy-digest@lists.xmission.com Errors-To: owner-utah-astronomy-digest@lists.xmission.com Precedence: bulk utah-astronomy-digest Thursday, May 11 2000 Volume 01 : Number 011 ---------------------------------------------------------------------- Date: Wed, 29 Mar 2000 11:08:00 -0700 From: ("David Dunn") Subject: (utah-astronomy) MPL results. The following web page has the results of the report on the MPL and DS2. http://spaceflight.nasa.gov/spacenews/releases/h00-46.html - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Fri, 31 Mar 2000 07:26:07 -0700 From: "Alyxandra K. MacLeod" Subject: (utah-astronomy) Mails I just wanted to say that I'm rather disappointed that this list is not very popular. In the last few days I've received mails about astronomical subject, but none of them have been posted to the list. This is unfortunate, as I know a number of people who are subscribed to this list but are not getting those mails. I wonder how many others I don't receive? It was my hope that this list would become more of a resource, but it seems most people are bypassing it. Oh well, maybe someday... Cyn - -- "What does that mean?" "It means the Matrix cannot tell you who you are." ICQ #10306498 http://www.utahdogs.com - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Mon, 03 Apr 2000 20:58:12 -0600 From: Alyxandra MacLeod Subject: (utah-astronomy) [Fwd: Hansen Planetarium seeking cashier] - -------- Original Message -------- Subject: Hansen Planetarium seeking cashier Date: Mon, 03 Apr 2000 17:51:35 -0600 From: "P. Wiggins" Reply-To: p.wiggins@m.cc.utah.edu To: c@cashier Hi! There is an 3/4 time cashier position open at Hansen planetarium. The job is posted on the U of U's Human Resources website (http://www.personnel.utah.edu/employ gen.html) under Employment Opportunities General and Clerical. If you have any questions, please call Ann Ellingson at the planetarium at 801-531-4979. Cheers! Patrick :-) - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Wed, 5 Apr 2000 12:21:06 -0600 From: "Kay W. Hargis" Subject: (utah-astronomy) Astro Event of 6-7 April A friend was telling me of some Astro Event 6=7 April and asked me to see if I could find out what it was... I am painting my house and my April Sky & Tel is buried somewhere way down under... Can anyone enlighten me as to what the event is... Thanks.. Kay - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Wed, 5 Apr 2000 12:56:00 -0600 From: ("David Dunn") Subject: (utah-astronomy) April 6th On April 6, Mars passes within 1.1=B0 of Jupiter, with the growing cresce= nt moon lying 3=B0 south of Saturn. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Wed, 5 Apr 2000 13:07:23 -0600 From: "Barney B." <993@prodigy.net> Subject: RE: (utah-astronomy) Astro Event of 6-7 April Could be an interesting "alignment" of planets. APRIL 5 -- WEDNESDAY * Faint Mars appears just 1 degree to the right of Jupiter low in the west at dusk -- less than a finger's breadth at arm's length. Saturn shines to their upper left. Far below them, scan with binoculars shortly after sunset for the hairline crescent Moon. APRIL 6 -- THURSDAY * The crescent Moon shines just to the left or upper left of Saturn, Jupiter, and Mars low in the west during twilight -- a beautiful sight! APRIL 7 -- FRIDAY * Look west for the crescent Moon in twilight. Far to its lower right are Saturn, bright Jupiter, and faint Mars. Less far to the Moon's upper left is orange Aldebaran. Above courtsy of www.skypub.com BB - -----Original Message----- From: owner-utah-astronomy@lists.xmission.com [mailto:owner-utah-astronomy@lists.xmission.com]On Behalf Of Kay W. Hargis Sent: Wednesday, April 05, 2000 12:21 PM To: utah-astronomy@lists.xmission.com Subject: (utah-astronomy) Astro Event of 6-7 April A friend was telling me of some Astro Event 6=7 April and asked me to see if I could find out what it was... I am painting my house and my April Sky & Tel is buried somewhere way down under... Can anyone enlighten me as to what the event is... Thanks.. Kay - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Fri, 07 Apr 2000 07:35:14 -0600 From: "Alyxandra K. MacLeod" Subject: (utah-astronomy) [Fwd: Aurora warning] - -------- Original Message -------- Subject: Aurora warning Date: Thu, 06 Apr 2000 14:17:45 -0600 From: "P. Wiggins" Reply-To: p.wiggins@m.cc.utah.edu To: hpco@aurora /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ MIDDLE LATITUDE AURORAL ACTIVITY WARNING ISSUED: 17:35 UTC, 06 APRIL /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ VALID BEGINNING AT: EFFECTIVE IMMEDIATELY VALID UNTIL: 19:00 UTC ON 07 APRIL HIGH RISK PERIOD: 06 APR (UTC days) MODERATE RISK PERIOD: 06 - 09 APR PREDICTED ACTIVITY INDICES: 50, 20, 25, 15 (06 APR - 09 APR) POTENTIAL MAGNITUDE OF MIDDLE LATITUDE AURORAL ACTIVITY: MODERATE TO HIGH POTENTIAL DURATION OF THIS ACTIVITY: MAIN BELT = 12 TO 18 HOURS MINOR BELT = 18 TO 36 HOURS ESTIMATED OPTIMUM OBSERVING CONDITIONS: NEAR LOCAL MIDNIGHT EXPECTED LUNAR INTERFERENCE: NONE OVERALL OPPORTUNITY FOR OBSERVATIONS FROM MIDDLE LATITUDES: GOOD AURORAL ACTIVITY MAY BE OBSERVED APPROXIMATELY NORTH OF A LINE FROM... OREGON TO SOUTHERN IDAHO AND POSSIBLY PARTS OF SOUTHERN UTAH TO SOUTHERN WYOMING AND POSSIBLY EXTREME NORTHERN REGIONS OF NEBRASKA TO IOWA TO CENTRAL REGIONS OF ILLINOIS, INDIANA AND OHIO TO SOUTHERN PENNSYLVANIA TO NEW JERSEY. RECEIVE REAL-TIME AURORAL ACTIVITY WATCHES AND WARNINGS BASED ON REAL-TIME SOLAR WIND CONDITIONS USING THE SOFTWARE AT: http://solar.spacew.com/swarm SYNOPSIS... A very vigorous interplanetary disturbance impacted the Earth near 16:04 UTC on 06 April. Although we are still in the initial phase of this disturbance, it appears conditions may be setting up nicely for the generation of a minor to major auroral storm. There is also a good chance periods of activity may become visible throughout many middle latitude regions of the night-sectors of North America. PLEASE REPORT OBSERVATIONS OF AURORAL ACTIVITY TO: http://solar.spacew.com/www/auroras.html ESTIMATED AURORAL VISIBILITY FROM THE GROUND, AS WELL AS SPACECRAFT AURORAL IMAGERY AND STATISTICAL PLOTS OF ANTICIPATED ACTIVITY CAN BE FOUND AT: http://www.spacew.com/www/aurora.html ** End of Warning ** - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Fri, 07 Apr 2000 10:29:27 -0600 From: "Alyxandra K. MacLeod" Subject: (utah-astronomy) [Fwd: 12.5" Meade Starfinder dobsonian for sale] - -------- Original Message -------- Subject: 12.5" Meade Starfinder dobsonian for sale Date: Fri, 07 Apr 2000 09:49:00 -0600 From: "P. Wiggins" Reply-To: p.wiggins@m.cc.utah.edu To: c@scopefs FORWARDED from Bob Ritchie at rritchie@inet-1.com FS: It is like new with the Magellan I computer system. It is an F4.5, standard Meade 12.5. It does have a 2" focuser with a 1 1/4 adapter and a mount for a telrad on it. I put it in the ASTROMART classifieds and have received mostly out of state inquires. The scope goes for $795 and the computer is about $300. I would like $850 for both. Bob Ritchie rritchie@inet-1.com - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Wed, 12 Apr 2000 10:07:00 -0600 From: ("David Dunn") Subject: (utah-astronomy) Big Dipper Star Does anyone know about a star that was visible in January, went away, and is back now? One of my co-workers asked me about it. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Wed, 12 Apr 2000 16:29:18 -0600 From: "Reynolds, Rich" Subject: RE: (utah-astronomy) Big Dipper Star Isn't that the one within the Big Dipper? Rich -----Original Message----- From: Dunn.David@amstr.com [mailto:Dunn.David@amstr.com] Sent: Wednesday, April 12, 2000 10:07 AM To: utah-astronomy@lists.xmission.com Subject: (utah-astronomy) Big Dipper Star Does anyone know about a star that was visible in January, went away, and is back now? One of my co-workers asked me about it. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Thu, 13 Apr 2000 12:21:42 PDT From: "David Bennett" Subject: (utah-astronomy) Cool JPL Mars Photos For those who haven't seen these please check out the links below. Dave Bennett MEDIA RELATIONS OFFICE JET PROPULSION LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY NATIONAL AERONAUTICS AND SPACE ADMINISTRATION PASADENA, CALIFORNIA 91109. TELEPHONE (818) 354-5011 http://www.jpl.nasa.gov Contact: Mary Hardin IMAGE ADVISORY April 10, 2000 NEW GLOBAL SURVEYOR IMAGES REVEAL EXOTIC MARTIAN LANDSCAPE Two new photo mosaics, created with images from NASA's Mars Global Surveyor spacecraft now in orbit at Mars, may help scientists understand what materials make up the exotic, multi- layers of the South Pole. Scientists theorize that the thickness and the composition of the layers in the south polar region could hold a record of climate change in a way that is similar to how years of drought and years of plentiful rain change the width of rings in a tree trunk on Earth. Because the south polar terrain is so strange and new to human eyes, no one as yet has an entirely adequate explanation as to what is being seen. The layers may be made up of frozen carbon dioxide, water ice and fine dusts that have been eroded over time. The mosaics were produced by imaging team scientists at the U.S. Geological Survey, Flagstaff, AZ and the California Institute of Technology, Pasadena, CA. The Global Surveyor images are available at http://photojournal.jpl.nasa.gov/new or http://www.msss.com. Mars Global Surveyor is managed by the Jet Propulsion Laboratory for NASA's Office of Space Science, Washington, DC. JPL is a division of the California Institute of Technology in Pasadena. ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Thu, 13 Apr 2000 13:37:04 -0600 From: "P. Wiggins" Subject: Re: (utah-astronomy) Cool JPL Mars Photos David Bennett wrote: > > For those who haven't seen these please check out the links below. > Dave Bennett > The mosaics were produced by imaging team scientists at the > U.S. Geological Survey, Flagstaff, AZ and the California > Institute of Technology, Pasadena, CA. The Global Surveyor images > are available at http://photojournal.jpl.nasa.gov/new or > http://www.msss.com. And don't forget that you can also see them (and a whole lot more) at http://planet.state.ut.us in the "THE NEWEST IMAGES WE'VE FOUND ON THE NET" section. Cheers! Patrick :-) - --- Patrick Wiggins Hansen Planetarium SLC, UT, USA p.wiggins@m.cc.utah.edu 801-531-4952 - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Fri, 14 Apr 2000 09:27:00 -0600 From: ("David Dunn") Subject: RE: (utah-astronomy) Big Dipper Where is it in the big dipper? I haven't heard about it. - ------------------( Forwarded letter 1 follows )--------------------- Date: Wed, 12 Apr 2000 16:29:18 -0600 To: utah-astronomy.lists.xmission.co[utah-astronomy]@CSendb.SMTP3 From: Rich.Reynolds[rreynolds]@acs.utah.edu Sender: owner-utah-astronomy@lists.xmission.com Reply-To: utah-astronomy@lists.xmission.com Subject: RE: (utah-astronomy) Big Dipper Star Isn't that the one within the Big Dipper? Rich -----Original Message----- From: Dunn.David@amstr.com [mailto:Dunn.David@amstr.com] Sent: Wednesday, April 12, 2000 10:07 AM To: utah-astronomy@lists.xmission.com Subject: (utah-astronomy) Big Dipper Star Does anyone know about a star that was visible in January, went away, and is back now? One of my co-workers asked me about it. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Mon, 17 Apr 2000 14:04:25 -0600 From: "Alyxandra K. MacLeod" Subject: (utah-astronomy) [Fwd: RTMC] - -------- Original Message -------- Subject: RTMC Date: Mon, 17 Apr 2000 12:30:25 -0600 From: "Georgia (R7M4)" Reply-To: therookie77@hotmail.com Riverside Telescope Makers Conference (RTMC) The 32nd annual Riverside Telescope Makers Convention will be held May 26th thru May 29th (Memorial Day Weekend). It is held at Camp Oaks, a YMCA camp near Big Bear Lake, California. The conference is a combination of speakers, commercial vendors, a swap meet, and all-night star parties. There are often several scopes in the 30 to 40 inch range to look at during the day and look through at night. As indicated by its title, the emphasis is on Telescope Making. Talented telescope builders bring their latest efforts to show to attendees. About a half dozen of the best efforts are awarded Merit Awards. A special award is also given for the best scope built with found, surplus or otherwise inexpensive materials. Our own Kim Hyatt bas been one of the Judges and also a winner. Several other SLAS members have received awards. There are between 50 and 70 vendors offering new and used telescopes, new and used equipment, software, tee shirts, books, prints and slides and lots of other do-dads. Both Sky & Telescope and Astronomy magazines are there. Celestron, Meade, Lumicon, Televue, Pocono Optics and Orion are just a few of the other big names you will find. Saturday morning starts the Swap Meet which tapers off through the day but sometimes continues again the next day. Any one can sell or buy at the Swap Meet and lots of great bargains are available. Bring lots of cash! You can stay in the dorms, camp in your own tent or one of the shelters (all sites are available First-Come, First-Serve) at Camp Oaks, or stay in town in a motel. You bring your own food or pay for the meal plan which includes 3 meals a day. Eating in the dinning hall is a great opportunity to shmooze with astronomers from every part of the country exchanging ideas about telescopes and clubs. Attendance varies from 800 to 2,300 (day passes are available for walk-ins) depending on the weather and the moon phase. Most years it is warm to hot in the daytime. You need sun screen, a hat and sun glasses. The 7,600 foot elevation can turn cold at night and about once in a while it snows. Bring some warm clothing and extra bedding. Be prepared for any type of weather. Saturday and Sunday nights have drawings for dozen of door prizes including some worth thousands of dollars. People must be present to win. Well worth staying for. In the past several years there have been 15 to 25 SLAS members and 30 to 40 Northern Utahns. Registration Forms for RTMC will be available at the meetings. Discount prices are available if registering before May 1st. We hope to see new SLAS faces at RTMC this year and hope you will enjoy attending this event. Enclosed is a registration form for your convenience. Any further questions can be directed to oursleves. Deloy and Karen Pierce P.O. Box 674 Farmington, UT. 84025 (801) 451-8215 - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Thu, 20 Apr 2000 15:46:03 -0600 From: "Alyxandra K. MacLeod" Subject: (utah-astronomy) Info Chuck sent this to the list... Hi: I just wanted to call your attention to a page put up by Jeff DeTray, describing his experiences making his own eyepieces, using my recent S & T article as a guide: http://www.astronomyboy.com/eyepieces/ Pass the url along to anyone who you feel would benefit from Jeff's project. He has several handy tips on making the housings that I hadn't thought of, and explores a design more complex than the garden-variety symmetrical. While at the site, be sure to check out Jeff's other efforts! Thanks for your time Chuck Hards - -- "What does that mean?" "It means the Matrix cannot tell you who you are." ICQ #10306498 http://www.utahdogs.com - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Fri, 21 Apr 2000 13:04:27 -0600 From: "Alyxandra K. MacLeod" Subject: (utah-astronomy) [Fwd: Tribune Article] - -------- Original Message -------- Subject: Tribune Article Date: Fri, 21 Apr 2000 12:27:01 -0600 From: Karen Pierce Here is the link to the Tribune article. http://www.sltrib.com/2000/Apr/04202000/Science/42664.htm Hope you all enjoy it. Deloy and Karen - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Mon, 24 Apr 2000 07:12:54 -0600 From: "Alyxandra K. MacLeod" Subject: (utah-astronomy) [Fwd: Big sunspot and scope FS] - -------- Original Message -------- Subject: Big sunspot and scope FS Date: Sun, 23 Apr 2000 19:22:00 -0600 From: Patrick Wiggins Reply-To: p.wiggins@m.cc.utah.edu To: c@scopefs 1) Many thanks to whomever cleared the skies just in time for yesterday's Sun party. :-) Those who did not make it to the Sun party might want to grab a solar filter and have a look at our star. Many sunspots to be seen including one big enough to be seen at 1 power. 2) The following comes from Erik Hansen. If you are interested, please reply to him at ehansen@networld.com. For Sale, 20 inch Dobsonian with trailer. Galaxy Optics f4 with QSP enhanced coatings on both primary and secondary. Novak secondary holder and 16 pt floatation cell. Primary has small edge chips that are blackened. Detachable finder bracket for 80 mm finder. Finder scope not included, Telrad base but no telrad. 4 inch secondary. Asking $3500 if sold along wasatch front. Contact, Erik Hansen at ehansen@networld.com or call 801-253-2201 evenings. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Mon, 24 Apr 2000 20:27:55 -0600 From: Alyxandra MacLeod Subject: (utah-astronomy) [Fwd: Star Party] - -------- Original Message -------- Subject: Star Party Date: Mon, 24 Apr 2000 19:08:25 EDT From: KWarner381@aol.com Hi, Just a reminder for those that are interested or signed up. Tomorrow, Tuesday 4/25, Mtn. Shadows Elementary - 5255 W. 7000 S. at dusk. See you there, Ken - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Fri, 28 Apr 2000 13:11:28 -0600 From: "Alyxandra K. MacLeod" Subject: (utah-astronomy) [Fwd: More Tribune Articles] - -------- Original Message -------- Subject: More Tribune Articles Date: Fri, 28 Apr 2000 12:19:32 -0600 From: Karen Pierce Yesterday the following articles were found in the Main section of the newspaper (not the Science Section). Enjoy!!!!!! http://www.sltrib.com/2000/apr/04272000/nation_w/44703.htm AND http://www.sltrib.com/2000/apr/04272000/nation_w/44710.htm Deloy and Karen Pierce - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Sat, 29 Apr 2000 08:55:57 -0600 From: Joe Borgione Subject: (utah-astronomy) EyePiece Selection Advice Hello- I have an 8" newtonian dobs telescope and would like to purchase some new eypieces. Currently I have two; 26mm and 10mm. I particularly enjoy viewing galaxies and I'd like to see more detail of them than I do now. Any recomedations on size/brand of eyepieces? Thanks for any advice- Joe Borigone jborigon@micron.net - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Sat, 29 Apr 2000 22:22:21 -0700 From: "William Kelley" Subject: (utah-astronomy) Fw: spherical mirrors for telescopes This is a multi-part message in MIME format. - ------=_NextPart_000_0012_01BFB229.63460640 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable - ----- Original Message -----=20 From: William Kelley=20 To: utah-astronomy@lists.xmission.com=20 Sent: Saturday, April 29, 2000 5:08 PM Subject: spherical mirrors for telescopes Spherical mirrors can be used instead of parabolic mirrors in Newtonian = telescopes. The mirrors are supported on a ring at their edge and pulled = to a parabola with tension applied inside to flex the mirrors to a very = high quality parabola. The calculations for the proper distribution of = puller tension has been done by an associate of mine- Alan Adler. The = results are available in a simple-to-use form at www.seds.org/TAC . Gary = Seronik of Sky & Tel is assembling an article for publication. Kim Hyatt = has an experimental 13.1" version of this concept. I will be pleased to = respond to questions . Bill Kelley - ------=_NextPart_000_0012_01BFB229.63460640 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----=20
From: William=20 Kelley
Sent: Saturday, April 29, 2000 5:08 PM
Subject: spherical mirrors for telescopes

 
Spherical mirrors can be used instead of = parabolic mirrors=20 in Newtonian telescopes. The mirrors are supported on a ring at their = edge and=20 pulled to a parabola with tension applied inside to flex the mirrors to = a very=20 high quality parabola. The calculations for the proper distribution of = puller=20 tension has been done by an associate of mine- Alan Adler. The results = are=20 available in a simple-to-use form at www.seds.org/TAC . Gary Seronik of = Sky &=20 Tel is assembling an article for publication. Kim Hyatt has an = experimental=20 13.1" version of this concept. I will be pleased to respond to questions = . Bill=20 Kelley
- ------=_NextPart_000_0012_01BFB229.63460640-- - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Mon, 01 May 2000 12:10:37 -0600 From: Alyxandra MacLeod Subject: (utah-astronomy) [Fwd: GPS news] Sending this to the sailing list too as it might prove interesting for sailors as well as astronomers. Cynthia - -------- Original Message -------- Subject: GPS news Date: Mon, 01 May 2000 12:00:20 -0600 From: Patrick Wiggins Reply-To: p.wiggins@m.cc.utah.edu To: c@gps Those who use GPS may want to have a look at: http://www.whitehouse.gov/library/PressReleases.cgi?date=0&briefing=0 It's an announcement saying that effective midnight tonight the government will stop the intentional degradation of the GPS signals. This should make it easier to determine exact locations for certain astronomical observations. Clear skies! Patrick :-) - --- Patrick Wiggins Hansen Planetarium SLC, UT - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Fri, 05 May 2000 07:32:17 -0600 From: "Alyxandra K. MacLeod" Subject: (utah-astronomy) Eta Aquarid A friend at work told me that this "Jupiter Effect" will be causing the meteor shower. Had to set her straight on that one. :) Here's the Deseret News Article: http://deseretnews.com/dn/view/0,1249,165009433,00.html? Cynthia - -- "What does that mean?" "It means the Matrix cannot tell you who you are." ICQ #10306498 http://www.utahdogs.com - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Wed, 10 May 2000 18:05:50 -0600 (MDT) From: Mark Dakins Subject: Re: (utah-astronomy) EyePiece Selection Advice > Hello- > > I have an 8" newtonian dobs telescope and would like to purchase some > new eypieces. Currently I have two; 26mm and 10mm. I particularly > enjoy viewing galaxies and I'd like to see more detail of them than I do > now. Any recomedations on size/brand of eyepieces? > > Thanks for any advice- > > Joe Borigone > jborigon@micron.net I may regret doing this, but here goes. First, all of the following is my opinion, eyepiece selection is a hotly debated topic among amateur astronomers and opinions vary widely. Second, in spite of what I am about to say below, the controling factor on both resolution and brightness of your view of a galaxy is the aperture of your telescope. A (poor) eyepiece can degrade your view below what your scope is capable of providing, but it can not make it better than what your eight inch mirror is capable of providing. That said, general practice for small scopes is to have two to four "magnifications." I say magnifications rather than eyepieces since you can use a good barlow lense to double the effective number of eyepieces. The rule of thumb is to have a low power eyepiece a high power eyepiece and maybe a mid power eyepiece. The low power eyepiece should provides a 7mm exit pupil, this is the lowest power your scope is capable of that uses the whole aperture; below this magnification your scope is no longer an eight inch and you start running the risk of seeing the central obstruction. The exit pupil of an eyepiece is (aperture x eyepiece focal length) / objective focal length The high power magnification should not exceed some magic limit; the one I most often see quoted these days is 50 power per inch of aperture. I personally believe that this number needs a lot of qualification. A well made refractor can easily reach 100 power per inch or more while a large aperture scope (say anything bigger than 12 or 15 inches) will seldom be useful at as much as 50 power per inch. If the magnifications provided by those two eyepieces are too far apart you may need one or more additonal magnifications in between. Brands. This is where the "eyepiece religion" wars are REALLY fought. In my experience there is more difference in quality between supposedly identical eyepieces of a given brand than any of us wish there were. Frequently these differences are greater than those between the averages of two comparable eyepieces by two different manufacturers. That said, you do tend to get what you pay for. You will seldom go wrong buying Televue eyepieces although the best of the Meades (the series 4000s) are nearly as good, the Pentax eyepieces are excellent, and several other manufacturers make good to very good eyepieces. As with telescopes I recommend coming to my star parties, SLAS star parties, or other star parties and try out eyepieces to decide what you need/want/would settle for. Hope this helps. If you have specific questions I can try to address those. Mark - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ Date: Thu, 11 May 2000 09:55:42 -0600 From: Bob_Cavanaugh@3com.com Subject: Re: (utah-astronomy) EyePiece Selection Advice Mark's treatment is excellent,here are some of my thoughts: 1. If you wear eyeglasses, eye relief is a MAJOR consideration. I prefer at least 22mm of eye relief, which eliminates many eyepieces. You also should check if the eyeshield (if any) can roll back. If the eye relief is smaller than say 20mm, you will not be able to utilize the entire field of view 2. These are purely my preferences, but I will list my collection. I use a C8 and a C5: a. Orion 35mm Ultrascopic - I am not sure what the latest incarnation of this one is, but it is great for wide star fields and big objects b. Meade 6.5m Ultrascan - too much power for the 5", but gives great views in the 8 c. Televue 19mm - excellent all-around eyepiece d. University Optics 13mm - no longer available, excellent all-around e. Meade 8.5mm - This baby is the size and weight of a hand grenade, I don't use it much. Good for galaxies and nebulae. I also have the typical 25mm that came with the C5, it is not a bad eyepiece but not on par with my others. I bought my C8 used in the mid-80's and it had (all Celestron Kellners) 40mm, 25mm, and 9mm. My other eyepieces blow these ones away, mainly because of eye relief. I can't see much out of any of these except the 40mm, I can usually see NOTHING out of the 9, unless the moon is full. I also have a University Optics Klee shorty Barlow, which I don't use on anything smaller than the 8. To echo Mark's qualifiers, most of my visual work is done between 60-120X. Only with really good conditions do I push it any further. I would much rather see a bright sharp but smaller image than a large dim and fuzzy one (Unless I am looking at Halley's :-) Mark Dakins on 05/10/2000 06:05:50 PM Please respond to utah-astronomy@lists.xmission.com To: utah-astronomy@lists.xmission.com cc: (Bob Cavanaugh/MTN/US/3Com) Subject: Re: (utah-astronomy) EyePiece Selection Advice > Hello- > > I have an 8" newtonian dobs telescope and would like to purchase some > new eypieces. Currently I have two; 26mm and 10mm. I particularly > enjoy viewing galaxies and I'd like to see more detail of them than I do > now. Any recomedations on size/brand of eyepieces? > > Thanks for any advice- > > Joe Borigone > jborigon@micron.net I may regret doing this, but here goes. First, all of the following is my opinion, eyepiece selection is a hotly debated topic among amateur astronomers and opinions vary widely. Second, in spite of what I am about to say below, the controling factor on both resolution and brightness of your view of a galaxy is the aperture of your telescope. A (poor) eyepiece can degrade your view below what your scope is capable of providing, but it can not make it better than what your eight inch mirror is capable of providing. That said, general practice for small scopes is to have two to four "magnifications." I say magnifications rather than eyepieces since you can use a good barlow lense to double the effective number of eyepieces. The rule of thumb is to have a low power eyepiece a high power eyepiece and maybe a mid power eyepiece. The low power eyepiece should provides a 7mm exit pupil, this is the lowest power your scope is capable of that uses the whole aperture; below this magnification your scope is no longer an eight inch and you start running the risk of seeing the central obstruction. The exit pupil of an eyepiece is (aperture x eyepiece focal length) / objective focal length The high power magnification should not exceed some magic limit; the one I most often see quoted these days is 50 power per inch of aperture. I personally believe that this number needs a lot of qualification. A well made refractor can easily reach 100 power per inch or more while a large aperture scope (say anything bigger than 12 or 15 inches) will seldom be useful at as much as 50 power per inch. If the magnifications provided by those two eyepieces are too far apart you may need one or more additonal magnifications in between. Brands. This is where the "eyepiece religion" wars are REALLY fought. In my experience there is more difference in quality between supposedly identical eyepieces of a given brand than any of us wish there were. Frequently these differences are greater than those between the averages of two comparable eyepieces by two different manufacturers. That said, you do tend to get what you pay for. You will seldom go wrong buying Televue eyepieces although the best of the Meades (the series 4000s) are nearly as good, the Pentax eyepieces are excellent, and several other manufacturers make good to very good eyepieces. As with telescopes I recommend coming to my star parties, SLAS star parties, or other star parties and try out eyepieces to decide what you need/want/would settle for. Hope this helps. If you have specific questions I can try to address those. Mark - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. - - To unsubscribe from utah-astronomy, send an email to "majordomo@xmission.com" with "unsubscribe utah-astronomy" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message. ------------------------------ End of utah-astronomy-digest V1 #11 *********************************** - To unsubscribe to $LIST, send an email to "majordomo@xmission.com" with "unsubscribe $LIST" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.