Jump to content


Photo

Another Uranus IR685 f20 8/20/13

  • Please log in to reply
7 replies to this topic

#1 sfugardi

sfugardi

    Gemini

  • -----
  • Posts: 3066
  • Joined: 30 Sep 2006
  • Loc: CT

Posted 20 August 2013 - 08:33 AM

Under good seeing but poor transparency with a bright mooon, I was able to collect some new Uranus data. My plan was to go a little higher than f22 by switching the 2x barlow glass onto the longer 1.8x body, however, I outsmarted myself and grabbed the new 2x which is more like 1.6x at this point (tried on Neptune but still too much for the IR). By the time, I realized it the sky was brightening. So attached is a 1680sec capture at 5fps at approx f20 using IR685.

Regards,
Steve

Attached Files



#2 sfugardi

sfugardi

    Gemini

  • -----
  • Posts: 3066
  • Joined: 30 Sep 2006
  • Loc: CT

Posted 20 August 2013 - 08:35 AM

So, you will notice that I left off the N pole indication due to the fact that the drift test and WinJupos do not seem to agree. I must be missing something basic on the orientation. Any simple advice would be greatly appreciated.

Regards,
Steve

Attached Files



#3 Pete Gorczynski

Pete Gorczynski

    Messenger

  • *****
  • Posts: 425
  • Joined: 09 May 2008
  • Loc: Oxford, CT USA

Posted 20 August 2013 - 09:15 AM

Steve,

Try http://pds-rings.set.../viewer2_ura.pl to get the correct orientation. There is also a viewer for Neptune to which John Boudreau turned me on to.

Also I think tonight we may have an excellent oppotunity for good seeing in CT, but don't wait too long because I expect fog to roll in late. Have you tried to image at prime focus? Sure, the image scale is small, but both Uranus and Neptune are low surface brightness objects. I think using a barlow spreads out what little light is available too much.

Regards,

Pete G.

#4 lcd1080

lcd1080

    Viking 1

  • -----
  • Posts: 999
  • Joined: 03 Jun 2010
  • Loc: Maryland, USA

Posted 20 August 2013 - 10:11 AM

Another high quality effort Steve! As for grabbing the new 2x don't feel bad, at 4 in the morning my IQ regularly slips to a level where that kind of mistake is to be expected.

Pete

#5 sfugardi

sfugardi

    Gemini

  • -----
  • Posts: 3066
  • Joined: 30 Sep 2006
  • Loc: CT

Posted 20 August 2013 - 10:21 AM

Pete G, thanks for the info link. I tried to pull out the new Neptune data from last night looking for your limb brightening but no luck. I found Triton easily. At only 4fps for the IR data, there is no chance for a barlow. I'll compile the RGB data and post later. Wow the CSC looks excellent all night. I hope I have some energy left.

Pete, Thanks! It's tough getting 2hrs of sleep and waking up at 1am...

Regards,
Steve

Attached Files



#6 CPellier

CPellier

    Viking 1

  • -----
  • Posts: 902
  • Joined: 07 Aug 2010

Posted 20 August 2013 - 05:31 PM

Hi Steve, the orientation of WinJupos seems correct to me as well ;).
The planet is quite well circular but I think it lacks frame stacking. 2000 is not a lot on Uranus ;)

#7 sfugardi

sfugardi

    Gemini

  • -----
  • Posts: 3066
  • Joined: 30 Sep 2006
  • Loc: CT

Posted 20 August 2013 - 09:59 PM

Christophe, thanks for verifying the orientation. I can go back and try stacking 3 or 4K out of the 8K collected. Here's my IR-RGB Neptune pasted back onto the prior Ir stretched image,

Regards,
Steve

Attached Files



#8 sfugardi

sfugardi

    Gemini

  • -----
  • Posts: 3066
  • Joined: 30 Sep 2006
  • Loc: CT

Posted 20 August 2013 - 10:28 PM

Here's a 4000frame restack out of the 8403frames. The detail is not much different from the last 2K stack and does not seem to line up with the expected belt direction

Regards,
Steve

Attached Files








Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics