Europa and BA
Posted 15 November 2012 - 11:54 AM
I knew the GRS would transit around 1630UT and that Europa would be in eclipse during that period. What I did not expect to see was Europa's shadow nearly dead center in oval BA as it rounded Jupiter's trailing limb around 1500 UT tonight 15 Nov 2012.
15 Nov 1530 UT: Europa is nearly on the trailing limb as the GRS comes round into view. Oval BA and Europa's shadow leading the GRS. Europa's shadow appeared to be dead center in Oval BA. Seeing about 7 or 8 of 10, transparency mag 5.
1550 UT, Europa is visible in the limb darkening south of and trailing the GRS. It is just south of the darker belt trailing the GRS. Europa's shadow and BA are near the meridian with the shadow approaching the leading edge of BA.
1610UT, Europa no longer visible and oval BA and the shadow are just past the meridian. During the best seeing, it appears Europa's shadow is on BA's leading edge. It does appear Europa orbits just a bit faster than Jupiter's rotation. Seeing is less favorable 6 to 7/10, transparency mag 5.
Wow, twice back to back amazing views. This occurred about noon US eastern time, but it was visible here in Asia. The event just ended, so waiting and hoping someone imaged it.
Sketch will be posted later.
Posted 15 November 2012 - 08:27 PM
Posted 15 November 2012 - 08:39 PM
Yea, usually got to wait a few days, but yes...like browsing the imaging forum. It's nice to confirm those things that are hard to see.
Posted 15 November 2012 - 09:37 PM
Now I have another one to look for.
Posted 16 November 2012 - 02:44 AM
As for images, I might expect ALPO to post a few soon enough. Chris Go images around the same time I observe. He may have captured it, along with a few other amateur imagers in the area.
Posted 16 November 2012 - 05:31 PM
No matching pictures yet for this, and so far only one of the Io/GRS/Shadow train.
But while pictures will maybe show more detail, I am delighted to have seen it myself.
Even thought the image did get reflected off of a mirror..
Posted 16 November 2012 - 08:55 PM
It's always nice to see the object for yourself, IMO, reflected or otherwise. Images are certainly beautiful and an art form of sorts, per se. But, I get more kick from visual, ancient photon or not.
Eddgie, images posted on ALPO! Yea!
Posted 17 November 2012 - 10:34 AM
I like your visual account Norme its funny that you captured it like that saith was rounding the bend.
Posted 17 November 2012 - 11:46 AM
Posted 17 November 2012 - 12:36 PM
Posted 17 November 2012 - 03:29 PM
Excellent sketch of this rare event. I'm glad you were able to catch this.
Thanks for posting. Dean
Posted 18 November 2012 - 04:59 PM
A great observation and sketch--and impeccable timing. I remember the past couple of apparitions when Oval BA was hard to detect. You've got it with a bulls eye.
Posted 18 November 2012 - 10:40 PM