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Ziggy943
Carpal Tunnel
Reged: 08/11/06
Posts: 1823
Loc: Utah
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Inspired by the beautifull Ganymede occultation and eclipse of Europa the night of the 18th of September (19th UT) I went out hoping to see the Io occultation of Europa tonight.
Location, location, location. The first event we observed at our clubs observatory. Seeing there was pretty darn good and allowed high enough powers to distiguish the moon discs. Tonight was just the opposite.
I had to drop to 128x with a 10mm in order to maintain an image. Not enough to see the discs as the crossed.
The second event tonight will be the eclipse at 10:41 MDT. I'll be out again for that. Seeing doesn't need to be nearly as good to see Europa fade out. It will have to better than now if there is to be any chance of seeing the shape of the shadow.
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May your skies always be clear,
Ziggy
www.slas.us
4" Mak
#1, 160mm F8 TEC (born 1-18-2007, 27 lbs, 45.5" long), on AP900
6" F17.5 (D&G lens) (first light 6-7-2008)
9" F/14.9 Alvan Clark (1915), on Byers 812
14.25 F/5.5 Newt in a roll off observatory
Others, that have come and gone
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tigerroach
professor emeritus
Reged: 08/13/08
Posts: 508
Loc: Houston, TX
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Ha! Sorry I missed this thread. I should have placed my post in here instead of starting a new one.
I will be looking for more of these events while they last, and hope to see an eclipse...
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Brian
TeleVue TV-102, Gibralter alt-az mount
Webster 14.5" f/4.3 truss dob *under construction*
Canon 10x30 & 15x50 IS binocs
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Centaur
Pooh-Bah
Reged: 07/12/04
Posts: 1464
Loc: Chicago
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Here are some more timings Ive calculated for mutual events among Galilean satellites visible at nighttime from portions of North America over the next week. They are all partial events, and do not involve mutual shadow coverings (which would be true eclipses.) The distinction between occultations and transits may not be significant for partial events. But when an object appears covered by one with a larger angular diameter, that is an occultation; the converse is a transit. The timings are all CDT (UT-5). During the first two events, the satellite being transited will simultaneously be eclipsed by the shadow of Jupiter, making observation quite unlikely.
Verification of these timings by observers would be appreciated.
Ganymede will be in eclipse by the shadow of Jupiter during this event.
2009 OCT 26 at 20:12:40 CDT Io begins partial transit of Ganymede
2009 OCT 26 at 20:14:04 CDT Io covers 12% of diameter of Ganymede
2009 OCT 26 at 20:15:28 CDT Io ends partial transit of Ganymede
Io will be in eclipse by the shadow of Jupiter during this event.
2009 OCT 29 at 16:37:37 CDT Europa begins partial transit of Io
2009 OCT 29 at 16:39:29 CDT Europa covers 85% of diameter of Io
2009 OCT 29 at 16:41:22 CDT Europa ends partial transit of Io
Europas shadow will be transiting Jupiter during this event.
2009 OCT 29 at 21:03:54 CDT Ganymede begins partial occultation of Io
2009 OCT 29 at 21:06:53 CDT Ganymede covers 48% of diameter of Io
2009 OCT 29 at 21:09:55 CDT Ganymede ends partial occultation of Io
2009 OCT 30 at 22:54:47 CDT Ganymede begins partial occultation of Europa
2009 OCT 30 at 22:58:53 CDT Ganymede covers 67% of diameter of Europa
2009 OCT 30 at 23:02:59 CDT Ganymede ends partial occultation of Europa
2009 OCT 31 at 22:37:36 CDT Io begins partial occultation of Europa
2009 OCT 31 at 22:40:06 CDT Io covers 51% of diameter of Europa
2009 OCT 31 at 22:42:37 CDT Io ends partial occultation of Europa
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For astronomical graphics, including
monthly wallpaper calendar, visit:
www.CurtRenz.com/astronomical
Curt Renz - "Centaur"
Edited by Centaur (10/27/09 01:02 AM)
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