Bryce Canyon trip - Look for gegenschien please
For those of you going to Bryce, I would appreciate it you would look gegnschien at the following predicted opportunities computed for Salt Lake City. Bryce times, az and alts should be similar: Date MDT Az Alt 09/07/2007 01:00:00 171 42 09/08/2007 01:00:00 171 43 09/09/2007 01:00:00 171 43 09/10/2007 01:00:00 171 44 09/11/2007 01:00:00 171 44 For those of you who have not seen it, here are some photos: http://www.swisseduc.ch/stromboli/volcano/photoastro/gegenschein-en.html?id=... http://www.swisseduc.ch/stromboli/volcano/photoastro/gegenschein-en.html http://antwrp.gsfc.nasa.gov/apod/ap061226.html - Kurt P.S. - This may post twice; my email server does not appear to be working right. Earlier in the year, I posted a gegenschien sighting opportunity calendar. http://members.csolutions.net/fisherka/astronote/astromath/2007GegenschienEp... _______________________________________________ Sent via CSolutions - http://www.csolutions.net
At Bryce Canyon NP in June I had an interesting conversation with John Dobson regarding the gegenschein. I've always understood that the source of both the zodiacal light and gegenschein is sunlight reflected from interplanetary comet dust. In his characteristic way, John said, "NO!" According to John, the source is actually reflected sunlight from dust-size fused silica (glass) beads blasted from the surface of the Moon by impacts. Recently, I read a similar explanation at some website that I cannot now locate. Has anyone else heard this theory and know how well accepted it is? Does anyone know of other sources for the theory? (Not that I don't trust John Dobson, of course.) Also, for either theory, does anyone know at what distance the dust/glass is supposed to be from Earth that reflects the sunlight? Kim -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Kurt Fisher Sent: Wednesday, September 05, 2007 12:41 PM To: utah-astronomy@mailman.xmission.com Subject: [Utah-astronomy] Bryce Canyon trip - Look for gegenschien please For those of you going to Bryce, I would appreciate it you would look gegnschien at the following predicted opportunities computed for Salt Lake City. Bryce times, az and alts should be similar: Date MDT Az Alt 09/07/2007 01:00:00 171 42 09/08/2007 01:00:00 171 43 09/09/2007 01:00:00 171 43 09/10/2007 01:00:00 171 44 09/11/2007 01:00:00 171 44 For those of you who have not seen it, here are some photos: http://www.swisseduc.ch/stromboli/volcano/photoastro/gegenschein-en.html?id= 11 http://www.swisseduc.ch/stromboli/volcano/photoastro/gegenschein-en.html http://antwrp.gsfc.nasa.gov/apod/ap061226.html - Kurt P.S. - This may post twice; my email server does not appear to be working right. Earlier in the year, I posted a gegenschien sighting opportunity calendar. http://members.csolutions.net/fisherka/astronote/astromath/2007GegenschienEp hemerisSLC.html _______________________________________________ Sent via CSolutions - http://www.csolutions.net _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com ______________________________________________________________________ This e-mail has been scanned by Cut.Net Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on Cut.Nets Content Service, visit http://www.cut.net ______________________________________________________________________ Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM
I'm guessing that the dust is at the anti-solar Langrangian point. And if it's glass beads, then imaging might benefit from a polarizing filter... I'm at work now so no time to research the distance question. Good post Kim. On 9/6/07, Kim <kimharch@cut.net> wrote:
At Bryce Canyon NP in June I had an interesting conversation with John Dobson regarding the gegenschein. I've always understood that the source of both the zodiacal light and gegenschein is sunlight reflected from interplanetary comet dust. In his characteristic way, John said, "NO!" According to John, the source is actually reflected sunlight from dust-size fused silica (glass) beads blasted from the surface of the Moon by impacts. Recently, I read a similar explanation at some website that I cannot now locate. Has anyone else heard this theory and know how well accepted it is? Does anyone know of other sources for the theory? (Not that I don't trust John Dobson, of course.) Also, for either theory, does anyone know at what distance the dust/glass is supposed to be from Earth that reflects the sunlight?
That would have been my first guess, but I really don't have that much background in orbital dynamics. I'm hoping to get a new tracking platform operational by this weekend so that I can try some imaging, including the zodiacal light and gegenschien. Kim -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Thursday, September 06, 2007 1:28 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Bryce Canyon trip - Look for gegenschien please I'm guessing that the dust is at the anti-solar Langrangian point. And if it's glass beads, then imaging might benefit from a polarizing filter... I'm at work now so no time to research the distance question. Good post Kim. On 9/6/07, Kim <kimharch@cut.net> wrote:
At Bryce Canyon NP in June I had an interesting conversation with John Dobson regarding the gegenschein. I've always understood that the source of both the zodiacal light and gegenschein is sunlight reflected from interplanetary comet dust. In his characteristic way, John said, "NO!" According to John, the source is actually reflected sunlight from dust-size fused silica (glass) beads blasted from the surface of the Moon by impacts. Recently, I read a similar explanation at some website that I cannot now locate. Has anyone else heard this theory and know how well accepted it is? Does anyone know of other sources for the theory? (Not that I don't trust John Dobson, of course.) Also, for either theory, does anyone know at what distance the dust/glass is supposed to be from Earth that reflects the sunlight?
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com ______________________________________________________________________ This e-mail has been scanned by Cut.Net Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on Cut.Nets Content Service, visit http://www.cut.net ______________________________________________________________________ Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM
You have a decent planetarium program, right? Just compare the positions Kurt posted for the gegenschien and compare those to the sun's position on the same day. They should be approximately opposite in the sky. Gegenschien means "counterglow". The zodiacal light should be fairly easy right now, although Venus will be a huge overexposed blob for any imaging attempts in the morning hours once the moon is out of the picture. On 9/6/07, Kim <kimharch@cut.net> wrote:
That would have been my first guess, but I really don't have that much background in orbital dynamics.
I'm hoping to get a new tracking platform operational by this weekend so that I can try some imaging, including the zodiacal light and gegenschien.
I understand the positional issue for the gegenschien, and thanks for the information. I plan to print reference charts for tomorrow and Saturday from my planetarium program (SkyMap Pro). I'm still wondering about the "glass bead" theory. -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Thursday, September 06, 2007 3:22 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Bryce Canyon trip - Look for gegenschien please You have a decent planetarium program, right? Just compare the positions Kurt posted for the gegenschien and compare those to the sun's position on the same day. They should be approximately opposite in the sky. Gegenschien means "counterglow". The zodiacal light should be fairly easy right now, although Venus will be a huge overexposed blob for any imaging attempts in the morning hours once the moon is out of the picture. On 9/6/07, Kim <kimharch@cut.net> wrote:
That would have been my first guess, but I really don't have that much background in orbital dynamics.
I'm hoping to get a new tracking platform operational by this weekend so that I can try some imaging, including the zodiacal light and gegenschien.
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com ______________________________________________________________________ This e-mail has been scanned by Cut.Net Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on Cut.Nets Content Service, visit http://www.cut.net ______________________________________________________________________ Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM
So, if I've done this right, the anti-solar point should be about midway and north of a line between Neptune and Uranus. Correct? -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Thursday, September 06, 2007 3:22 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Bryce Canyon trip - Look for gegenschien please You have a decent planetarium program, right? Just compare the positions Kurt posted for the gegenschien and compare those to the sun's position on the same day. They should be approximately opposite in the sky. Gegenschien means "counterglow". The zodiacal light should be fairly easy right now, although Venus will be a huge overexposed blob for any imaging attempts in the morning hours once the moon is out of the picture. On 9/6/07, Kim <kimharch@cut.net> wrote:
That would have been my first guess, but I really don't have that much background in orbital dynamics.
I'm hoping to get a new tracking platform operational by this weekend so that I can try some imaging, including the zodiacal light and gegenschien.
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com ______________________________________________________________________ This e-mail has been scanned by Cut.Net Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on Cut.Nets Content Service, visit http://www.cut.net ______________________________________________________________________ Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM
Kurt, do you happen to have also RA/DEC coordinates available? -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Kurt Fisher Sent: Wednesday, September 05, 2007 12:41 PM To: utah-astronomy@mailman.xmission.com Subject: [Utah-astronomy] Bryce Canyon trip - Look for gegenschien please For those of you going to Bryce, I would appreciate it you would look gegnschien at the following predicted opportunities computed for Salt Lake City. Bryce times, az and alts should be similar: Date MDT Az Alt 09/07/2007 01:00:00 171 42 09/08/2007 01:00:00 171 43 09/09/2007 01:00:00 171 43 09/10/2007 01:00:00 171 44 09/11/2007 01:00:00 171 44 For those of you who have not seen it, here are some photos: http://www.swisseduc.ch/stromboli/volcano/photoastro/gegenschein-en.html?id= 11 http://www.swisseduc.ch/stromboli/volcano/photoastro/gegenschein-en.html http://antwrp.gsfc.nasa.gov/apod/ap061226.html - Kurt P.S. - This may post twice; my email server does not appear to be working right. Earlier in the year, I posted a gegenschien sighting opportunity calendar. http://members.csolutions.net/fisherka/astronote/astromath/2007GegenschienEp hemerisSLC.html _______________________________________________ Sent via CSolutions - http://www.csolutions.net _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com ______________________________________________________________________ This e-mail has been scanned by Cut.Net Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on Cut.Nets Content Service, visit http://www.cut.net ______________________________________________________________________ Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.1/963 - Release Date: 8/20/2007 5:44 PM
participants (3)
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Chuck Hards -
Kim -
Kurt Fisher