Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Pickerings triangle testing PI SpectophotometricColourcalibration module

  • Please log in to reply
5 replies to this topic

#1 pyrasanth

pyrasanth

    Fly Me to the Moon

  • *****
  • topic starter
  • Posts: 6,277
  • Joined: 08 Jan 2016

Posted 24 November 2022 - 08:45 AM

When I was learning how to use my CEM70G I took some data in the region of pickerings triangle. The mount was a bit out of sync so it put the target a bit off center however I did manage to capture some useable data that I caught in July of this year but I did not process until now.

 

This is 50 60 second subs taken with the RASA V2 on the ASI2600 MC Pro using the Optolong LE-enhance filter.

 

I used this data as an opportunity to test the new SpectophotometricColourcalibration module in PI. I knew I would have loads of faint stars so I downloaded the full Gaia 60 Gb+ database.

 

The best result with the new module was obtained by removing the stars from the raw integrated image and calibrating those stars from the newly created stars only image. This gave an even star background and gave a very nice set of star colours. I just used the Sony filter data as a possible match for the module which seemed to work okay however accuracy is expected to be off.

 

One issue not connected with the module is that I I could not get an astrometric solution with the WBPP module & I had to add the solution from ASTAP. I guess this is all down to the settings in WBPP. Unless you have WCS data you can't use the new module as obviously it needs the location to define the star data.

 

I then used DBE on the star extracted background and gave the star layer a small stretch thus not allowing the stars to blow out too much.

 

I think it produced a good image for under an hour of data- so next season I will go back and complete properly and on target.

 

The Astrobin image is here https://www.astrobin.../full/6s1ppl/0/

 

Comments invited as always.

 

Pickerings_RGB_CN.jpg


Edited by pyrasanth, 24 November 2022 - 08:46 AM.

  • Jim Thommes, rwstanley, elmiko and 3 others like this

#2 Jose_Salcedo

Jose_Salcedo

    Ranger 4

  • -----
  • Posts: 323
  • Joined: 20 Sep 2020
  • Loc: Porto, Portugal

Posted 24 November 2022 - 12:24 PM

Could you please share the settings that you used in the SPCC user interface? Thank you!


  • pyrasanth likes this

#3 pyrasanth

pyrasanth

    Fly Me to the Moon

  • *****
  • topic starter
  • Posts: 6,277
  • Joined: 08 Jan 2016

Posted 24 November 2022 - 02:08 PM

Could you please share the settings that you used in the SPCC user interface? Thank you!

There are some prerequitsites needed to get SPCC to work. The RGB image needs to have a WCS plate solve solution into its headers. I also suggest you download the full Gaia database which is about 64 GB of data- takes sometime but is worth the effort especially with long focal length instruments that may have few stars in the field of view.

 

The settings I use are as in the screenshot below. However you will need to modify from the drop downs what filters and camera you use- these will differ for every user. My settings have been set around the sensor and not the filter- so the results will not be as accurate as being able to select the exact filter brand and sensor.

 

SPCC.JPG


Edited by pyrasanth, 24 November 2022 - 02:09 PM.

  • Jim Thommes likes this

#4 Jose_Salcedo

Jose_Salcedo

    Ranger 4

  • -----
  • Posts: 323
  • Joined: 20 Sep 2020
  • Loc: Porto, Portugal

Posted 25 November 2022 - 09:30 AM

Thank you very much. I am still not clear on using "Ideal QE Curve" or the appropriate curve for the 2600MC sensor.

 

Best regards



#5 RonaldNC

RonaldNC

    Viking 1

  • -----
  • Posts: 597
  • Joined: 25 Jun 2019
  • Loc: Fuquay Varina, NC

Posted 25 November 2022 - 12:48 PM

Thank you very much. I am still not clear on using "Ideal QE Curve" or the appropriate curve for the 2600MC sensor.

 

Best regards

There's extensive documentation on their website.  However, they recommend using "Ideal QE Curve" for all OSC cameras.

Ron


  • Jose_Salcedo likes this

#6 Jose_Salcedo

Jose_Salcedo

    Ranger 4

  • -----
  • Posts: 323
  • Joined: 20 Sep 2020
  • Loc: Porto, Portugal

Posted 30 November 2022 - 08:12 AM

Thank you very much, Ron.




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics