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Kon Dealer
professor emeritus


Reged: 01/05/11

Loc: Cambridge UK
Shadow transit? new
      #5533373 - 11/22/12 05:02 AM

There was a gap in the clouds and rain last night so I nipped out with my Kson 102ED and had a quick look (or so I thought it would be) at Jupiter. There was a small ink-black circle low down and to the left (as I saw it) on Jupiter.
3 moons were visible out to the right.
Was it a "floater"?(I have a few), dirt on the EP? (no it didn't rotate). I watched it on and off for about 90 minutes then a distinct orb appeared next to Jupiter shortly after the dark spot disappeared.

My first shadow transit?


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Asbytec
Guy in a furry hat
*****

Reged: 08/08/07

Loc: La Union, PI
Re: Shadow transit? new [Re: Kon Dealer]
      #5533394 - 11/22/12 05:54 AM

Sounds just like a transit. If the dark spot disappeared, followed by a brighter orb behind it...sounds like you observed a transit. Congratulations. In December, when Jupiter passes opposition, the shadow/orb timing will reverse. The orb will cross the limb first, then the shadow.

There are a lot of sources on Jupiter's moons. Here's one, it even shows the shadows.

http://www.skyandtelescope.com/observing/objects/javascript/jupiter

Edited by Asbytec (11/22/12 06:10 AM)


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Kon Dealer
professor emeritus


Reged: 01/05/11

Loc: Cambridge UK
Re: Shadow transit? new [Re: Asbytec]
      #5533409 - 11/22/12 06:25 AM

Thanks Asbytec. The link was spot on for what I observed.
Yeh


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Asbytec
Guy in a furry hat
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Reged: 08/08/07

Loc: La Union, PI
Re: Shadow transit? new [Re: Kon Dealer]
      #5533434 - 11/22/12 07:01 AM



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David E
Post Laureate
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Reged: 05/25/06

Loc: North Carolina
Re: Shadow transit? new [Re: Asbytec]
      #5533531 - 11/22/12 08:39 AM

Sounds like it to me too. I find shadow transits easier to see than moon transits most of the time. Try Calsky.com. Go to Planets, Jupiter, Apparent View/Data and set the time for when you observed. That will show you the positions of the Moons, shadows, and GRS.

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azure1961p
Postmaster
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Reged: 01/17/09

Loc: USA
Re: Shadow transit? new [Re: David E]
      #5533654 - 11/22/12 10:08 AM

Yes a transit. Caught an Io transit last night at 2am Est.

Pete


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Centaur
Vendor
*****

Reged: 07/12/04

Loc: Chicago
Re: Shadow transit? new [Re: Kon Dealer]
      #5533947 - 11/22/12 01:13 PM

Quote:

My first shadow transit?




Yes, Kon; congratulations! Now for your second and third. There are transits of Europa and its shadow across Jupiter occurring right now for Europeans, Asians, Australians and New Zealanders. There will be transits of Io and its shadow across Jupiter tomorrow night for observers in the Americas and Europe.

Each day I update my timetable and preview graphics for that night's events involving Jupiter's Galilean satellites. They can be seen at: www.CurtRenz.com/jupiter

Edited by Centaur (11/22/12 01:34 PM)


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MrMxyzptlk
member


Reged: 08/19/12

Re: Shadow transit? new [Re: Centaur]
      #5534039 - 11/22/12 02:28 PM

Yesterday there was a Ganymede transit with shadow from around 19:00 UTC. I observed it too, but I was planing for it with SkyTools. Tonight there was a Europa Shadow transit (still ongoing, but there are only a few minutes left), on the morning of Nov 24th from around 1:27 UTC (I say around because of the coordinate differences) there is an Io transit, another Io shadow transit on the 25th from 19:56 with a maximum at 21:01 UTC.

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Dave Mitsky
Postmaster
*****

Reged: 04/08/02

Loc: PA, USA, Planet Earth
Re: Shadow transit? new [Re: MrMxyzptlk]
      #5534136 - 11/22/12 04:00 PM

I observed the transits of the GRS, Io's shadow, and Io this morning through the 17" f/15 classical Cassegrain (162 to 360x) at the ASH Naylor Observatory. The seeing was very good and I was able to follow Io through a fair part of its transit. I observed Jupiter off and on until Io made its egress.

Dave Mitsky


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Bill Weir
Carpal Tunnel
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Reged: 06/01/04

Loc: Metchosin (Victoria), Canada
Re: Shadow transit? new [Re: azure1961p]
      #5534719 - 11/23/12 01:30 AM

Quote:

Yes a transit. Caught an Io transit last night at 2am Est.

Pete




Didn't notice the GRS? It would have still been there. Was showing some students at the school observatory the GRS using my 6". I pointed out that a shadow transit looked like it would be starting soon but clouds rolled in before it could start.

Congrats to the first time transit observer especially seeing as you didn't know it was going on and spotted it. Your skills are growing. Nice.

Bill


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REC
Post Laureate
*****

Reged: 10/20/10

Loc: NC
Re: Shadow transit? [Re: Bill Weir]
      #5536861 - 11/24/12 09:19 AM

There was a small black ink dot on the lower part of Jupiter last night while out for a quick view about 10pm. I had the 80mm out at 100x. Good banding as well:)

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