Return to the Cloudy Nights Telescope Reviews home page


Astrophotography and Sketching >> Solar System Imaging & Processing

Pages: 1
CPellier
scholastic sledgehammer


Reged: 08/07/10

Uranus with details, 13 and 16 august
      #6033018 - 08/18/13 02:48 PM

Hi all,
Two nights of good seeing allowed me to capture as well some details on Uranus. For this I use the Baader RG610 filter, which works better than the IR685 for my 250 mm telescope (more light, better resolution).
The best result, with 2012 comparison, shows the brightening on the north pole (in reality, this is a belt, but unresolved), and the equatorial belt:



The IR685 Baader shows only a faint EB:



And a RG610 image from the 13th, less good however:



All the images are taken from extremely long SER files (30-40 mn), a perfectly collimated 250 gregorian working at F/32. Some 10K raw frames are stacked each time, exposures range from 150 ms to 200 ms.
For each session I take a drift image that helps to find the correct orientation of the images, but if you can spot some moons at the same time, it works well.


Post Extras: Print Post   Remind Me!   Notify Moderator  
azure1961p
Postmaster
*****

Reged: 01/17/09

Loc: USA
Re: Uranus with details, 13 and 16 august new [Re: CPellier]
      #6033407 - 08/18/13 06:49 PM

Beautiful contrasty work!

Pete


Post Extras: Print Post   Remind Me!   Notify Moderator  
rolo
Pooh-Bah
*****

Reged: 01/14/07

Loc: GA, USA
Re: Uranus with details, 13 and 16 august new [Re: CPellier]
      #6033443 - 08/18/13 07:18 PM

Excellent work and impressive with 250mm scope.! How long is your exposure for the drifted image or is it a series of short exposures combined?

Post Extras: Print Post   Remind Me!   Notify Moderator  
CPellier
scholastic sledgehammer


Reged: 08/07/10

Re: Uranus with details, 13 and 16 august new [Re: rolo]
      #6033501 - 08/18/13 07:52 PM

Thanks Pete,
Thanks Rolando, the drift is obtained from a single movie (where I drift the planet in RA) and made as a dark frame under Registax.


Post Extras: Print Post   Remind Me!   Notify Moderator  
John Boudreau
scholastic sledgehammer
*****

Reged: 04/06/08

Loc: Saugus, MA
Re: Uranus with details, 13 and 16 august new [Re: CPellier]
      #6033546 - 08/18/13 08:28 PM

Fine results Christophe!

Have you been using a dispersion corrector with the 610? Although I think that it's not truly necessary with the 685 it may be worthwhile with the wider effective bandpass of the 610/camera combination.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Kokatha man
Postmaster
*****

Reged: 09/13/09

Loc: "cooker-ta man" downunda...
Re: Uranus with details, 13 and 16 august new [Re: John Boudreau]
      #6033559 - 08/18/13 08:36 PM

More good work with Uranus there Christophe..!

Post Extras: Print Post   Remind Me!   Notify Moderator  
DesertRat
Postmaster
*****

Reged: 06/18/06

Loc: Valley of the Sun
Re: Uranus with details, 13 and 16 august new [Re: CPellier]
      #6034486 - 08/19/13 12:28 PM

Splendid images Christophe! Expert technique and processing. Thanks for sharing!

Glenn


Post Extras: Print Post   Remind Me!   Notify Moderator  
CPellier
scholastic sledgehammer


Reged: 08/07/10

Re: Uranus with details, 13 and 16 august new [Re: DesertRat]
      #6034785 - 08/19/13 03:30 PM

Thank you Glenn and K Man !
John, I did not use the ADC. I assume this is not necessary with the RG610 - at least at an elevation of nearly 50.
This could be discussed, but as my ADC (ASH model) blocks a small part of near IR I'm not ready to lose photons on such a hard target... !


Post Extras: Print Post   Remind Me!   Notify Moderator  
sfugardi
Post Laureate


Reged: 09/30/06

Loc: CT
Re: Uranus with details, 13 and 16 august new [Re: CPellier]
      #6035530 - 08/19/13 10:42 PM

Christophe, excellent Uranus detail! How do you capture the drift with the camera? I try to orient Uranus to drift left with the base unplugged but haven't been able to image it. Last time out I had a histogram avg of 38% using the IR685 at f22/5fps. Tonight I will try to stretch to f25 and see if it can stay at 5fps. Your capture at f32 is very impressive. Thanks for sharing everything. If I get some good data, Ill post tomorrow.

Regards,
Steve


Post Extras: Print Post   Remind Me!   Notify Moderator  
CPellier
scholastic sledgehammer


Reged: 08/07/10

Re: Uranus with details, 13 and 16 august new [Re: sfugardi]
      #6037079 - 08/20/13 06:27 PM

Thanks Steve,
I start the movie when the planet is on one side of the CCD, then drift it in RA (I don't care what sense is it since I know where is celestial south). When arriving at the other side of the screen, I stop the drift and let the planet alone for a few seconds (by this way I get two balls at each ends of the light path).
I process it as a dark frame in Registax ("made dark"), strongly enhance the luminosity, and reduce it to 33 %.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
2 registered and 15 anonymous users are browsing this forum.

Moderator:  TG, Starman81, bilgebay, WOBentley 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 486

Jump to

CN Forums Home




Cloudy Nights Sponsor: Astronomics