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Centaur
2012-Sep-28, 06:20 PM
Australians will be treated to a lunar occultation of Jupiter during the early morning of 2012 OCT 06. This will begin as a nighttime event for observers in southwestern Australia and a daytime event for observers in southeastern Australia. Adelaide and Melbourne are on the graze path.

For my more detailed article and my three related charts with graphics and data, please click: www.CurtRenz.com/moon

Photos and descriptions of the event would be welcome additions to this thread.

Robert Tulip
2012-Sep-29, 08:07 AM
Wow Curt this diagram http://www.curtrenz.com/moon17.html showing how Jupiter will suddenly appear in the predawn sky in Perth from behind the dark part of the moon is totally amazing. I have informed the West Australian newspaper (assuming they knew already). Thanks. I will watch from Canberra, but this one would be worth a trip to Perth! Should get the TV stations and local radio to cover it.

Centaur
2012-Sep-29, 04:48 PM
Wow Curt this diagram http://www.curtrenz.com/moon17.html showing how Jupiter will suddenly appear in the predawn sky in Perth from behind the dark part of the moon is totally amazing. I have informed the West Australian newspaper (assuming they knew already). Thanks. I will watch from Canberra, but this one would be worth a trip to Perth! Should get the TV stations and local radio to cover it.

I'm glad that you're appreciative, Robert, but Canberra is too far north for an occultation. For Canberra observers there will merely be a close daytime conjunction. In the case of Perth, the Sun will have just begun to rise when Jupiter emerges from behind the Moon. Telescopic observers in Adelaide and Melbourne will see a daytime graze as lunar hills and valleys appear to pass across the disk of Jupiter. Only folks south of the graze path will witness both an immersion and emersion.

Robert Tulip
2012-Sep-30, 03:28 AM
Everywhere will see a close night time conjunction on 5-6 October, from the time of Jupiter's rise with the moon around midnight. I commented at Perth Astronomy Blog (http://www.blogger.com/comment.g?blogID=2479583&postID=4959807685668169382). Sunrise in Perth on 6 October is 5.47am, three minutes before the appearance of Jupiter from behind the moon. Jupiter will still be readily visible in daylight. Shame it is not at night. What about Albany (https://maps.google.com.au/maps?oe=&q=map+Albany&ie=UTF-8&hq=&hnear=0x2a391986cdb08f67:0x400f6382479c070,Albany+ WA&gl=au&ei=6r9nUPbeN4uZiAfQyIHYDw&ved=0CCIQ8gEwAA)?

Centaur
2012-Sep-30, 04:04 AM
What about Albany?

For Albany, Western Australia immersion will occur during nighttime at 04:50:40 UT+8 and emersion at 05:58:12 with the Sun 3.5° above the horizon. Say “Hi” to all of my friends in Albany!

Centaur
2012-Sep-30, 04:43 AM
My occultation timings are for the center of Jupiter. Here are a couple of polynomials I developed for determining the graze path and graze times for Jupiter’s center. The formulae are only good between eastern longitudes 133° and 147°. The only input is eastern longitude in decimal degrees. The results are latitude in decimal degrees and Universal Time in decimal hours.

L = 140 – Eastern Longitude

Latitude = –35.657762 + 0.445514 L – 0.000873 L² (possible error ±0.0069°)
Hour UT = 22.029556 – 0.013550 L – 0.000500 L² (possible error ±0.0006 hr)

Robert Tulip
2012-Sep-30, 05:27 AM
How frustrating. Maybe Antarctica is the only place to see Jupiter emerge at night?

Other possibilities are http://en.wikipedia.org/wiki/Kerguelen and http://en.wikipedia.org/wiki/Heard_Island_and_McDonald_Islands
except Heard and McDonald are uninhabited.

Centaur
2012-Sep-30, 05:59 AM
How frustrating. Maybe Antarctica is the only place to see Jupiter emerge at night?


Much of Antarctica will be in perpetual sunlight, while the Moon and Jupiter remain beneath the horizon due to their northern declination.

Book a trip to Geraldton, Western Australia. Immersion will occur during nighttime at 04:58:45 UT+8 and emersion at 05:39:57 with the Sun still 3.6° beneath the horizon.

I'm going to take advantage of your other idea and canoe from the USA to Heard Island. Both immersion and emersion will occur at night, albeit with the Moon and Jupiter fairly low. But during emersion the Sun will be 27° beneath the horizon. :dance:

Robert Tulip
2012-Sep-30, 04:04 PM
Message from Geraldton Astronomy Group (http://www.facebook.com/geroastro/posts/422578081125513#!/geroastro) "Sure will be! Have been waiting all year for this occultation :) "

Robert Tulip
2012-Oct-07, 02:05 PM
Message from Geraldton Astronomy Group (http://www.facebook.com/geroastro/posts/422578081125513#!/geroastro) "Sure will be! Have been waiting all year for this occultation :) "

Check these amazing photos of Jupiter next to the moon on 6 October, from Geraldton Astronomy Group

http://sphotos-c.ak.fbcdn.net/hphotos-ak-ash3/c156.0.403.403/p403x403/35442_424910177558970_294123919_n.jpg
http://sphotos-b.ak.fbcdn.net/hphotos-ak-ash4/c100.0.403.403/p403x403/311268_424908464225808_802366487_n.jpg
http://sphotos-g.ak.fbcdn.net/hphotos-ak-ash4/c100.0.403.403/p403x403/253153_424905774226077_1010347259_n.jpg

Centaur
2012-Oct-07, 06:19 PM
Check these amazing photos of Jupiter next to the moon on 6 October, from Geraldton Astronomy Group


Thanks for sharing those photos, Robert. It's good to know that folks in Western Australia had fair weather and a good observation session.

Robert Tulip
2012-Oct-15, 10:34 PM
Curt - Jupiter is retrograde for the rest of 2012 and is tracking the south lunar node. This suggests that lunar occultations of Jupiter are possible on 2 November, 29 November and 26 December.
As well, Venus crosses the North Node on 11 December.

Can you confirm if occultations will happen on these dates, and if so, where best viewing might be?

Many thanks.

Centaur
2012-Oct-15, 11:20 PM
Curt - Jupiter is retrograde for the rest of 2012 and is tracking the south lunar node. This suggests that lunar occultations of Jupiter are possible on 2 November, 29 November and 26 December.
As well, Venus crosses the North Node on 11 December.

Can you confirm if occultations will happen on these dates, and if so, where best viewing might be?

Many thanks.

Robert, the following information is from the Astronomical Tables of the Sun, Moon and Planets by Jean Meeus.

The current series of Jupiter occultations runs every month from 2012 JUN 17 to 2013 FEB 18.

NOV 02 – S Atlantic, S Africa
NOV 29 – S America, Atlantic, S Africa
DEC 26 – S America, S Atlantic, SW Africa
JAN 22 – Pacific, S America
FEB 18 – S Indian Ocean, S Australia (The one for you!)

On DEC 11 the Moon will appear to pass south of Venus for all observers. No Venus occultation will occur until a single event in 2013.

SEP 08 – Pacific, S America