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

NGC 7331 & NGC 1501 - more short exposure fun

This topic has been archived. This means that you cannot reply to this topic.
14 replies to this topic

#1 MvZ

MvZ

    Surveyor 1

  • *****
  • topic starter
  • Posts: 1,884
  • Joined: 03 Apr 2007

Posted 15 October 2015 - 04:11 AM

Hi All,

 

The deepsky fun continues with some more short exposure imaging. I again used the IMX249 camera for luminance (the sensor is like the IMX174, but slower - which doesn't matter for deepsky though - however, I currently prefer to have the longer cables that the gige camera allows me to use).

 

For the the image of NGC1501 I used about 1800 exposures of 1 second each, and combined them with some color data made with the ASI224 camera (2300 exposures of 1 second each).

 

Funny to see the ASI224 (as the ASI174) runs much cooler than the Blackfly IMX249; with an outside temperature of about 3C, the ASI measured around 10C, while the point grey blackfly was quite hot at 24C. Probably all due to the aluminium 'cooling block' that are the ASI camera's, the blackfly is tiny but there is no way it can get rid of the heat. I should probably use the ASI174 again next time (perhaps with a slightly longer and more flexible USB2 cable instead)...

 

All images recorded with the 16" Dobson on EQ platform. Processing in AS!2, post-processing in Photoshop.

 

20151010_2100_NGC7331.jpg

http://www.astrokraa...100_NGC7331.jpg

 

20151010_224525_85_sigma__DS_ngc1501_g4_

http://www.astrokraa...1501_g4_ap1.jpg

 



#2 Quaternion

Quaternion

    Viking 1

  • -----
  • Posts: 531
  • Joined: 08 Dec 2011

Posted 15 October 2015 - 05:10 AM

Wow.  I was going  to get an ASI224MC for planetary, but I didn't realize you could also do deep sky with it. Thanks for sharing and of course for your AS!2 software.



#3 Rick J

Rick J

    Cosmos

  • *****
  • In Memoriam
  • Posts: 8,376
  • Joined: 01 Mar 2008

Posted 15 October 2015 - 01:08 PM

Well done.  When I take 1" exposures I find some in sharp focus some really bad and most sort of focused.  Is you seeing steady enough to allow most of the frames to be used?  I'd need to take many hours worth to get 1800 usable one second frames on a typical night.

 

Rick



#4 bill w

bill w

    Voyager 1

  • *****
  • Posts: 11,347
  • Joined: 26 Mar 2005

Posted 15 October 2015 - 11:37 PM

beautiful 7331



#5 astronomy25

astronomy25

    Sputnik

  • -----
  • Posts: 30
  • Joined: 27 Jul 2014

Posted 16 October 2015 - 12:37 AM

spectacular ngc7331.
may I ask what kind of platform eq uses??

#6 Magellanico

Magellanico

    Ranger 4

  • -----
  • Posts: 379
  • Joined: 09 Jul 2005

Posted 16 October 2015 - 06:27 PM

Both images are amazing. The nebula is worthy. Keep posting more.



#7 chrysalis

chrysalis

    ISS

  • *****
  • Posts: 29,213
  • Joined: 10 Aug 2013

Posted 17 October 2015 - 06:34 AM

Triple wow on 1501 !!! :bow:



#8 JoseBorrero

JoseBorrero

    Soyuz

  • *****
  • Posts: 3,742
  • Joined: 04 Sep 2009

Posted 17 October 2015 - 07:52 AM

superb! :waytogo:    Emil Can you show how a single frame look?  Thanks!


Edited by JoseBorrero, 17 October 2015 - 07:53 AM.


#9 RandallK

RandallK

    Gemini

  • -----
  • Posts: 3,031
  • Joined: 10 Nov 2006

Posted 17 October 2015 - 06:01 PM

Ooooooooh!



#10 MvZ

MvZ

    Surveyor 1

  • *****
  • topic starter
  • Posts: 1,884
  • Joined: 03 Apr 2007

Posted 19 October 2015 - 02:29 PM

Thanks all!

 

>Is you seeing steady enough to allow most of the frames to be used?

In this case I could use many frames (80% or so), but I'm pretty sure the seeing wasn't that great. It does of course help a lot to pick targets that are (very) high up in the sky. In this case, NGC 7331 was at more than 70 degrees altitude!

I do have to watch out for the slightest bit of wind though, as this typically 'destroys' many more exposures than the seeing (the 16" Dob is rather tall, so even a small breeze can mess things up quite a bit).

 

I use a platform by Equatorial Platforms (an aluminium platform). Quite expensive, but stable. It's not mine actually, it's from Rik.

 

Single frames:

single_ngc1501_colour_imx224_1s.jpg
http://www.astrokraa...r_imx224_1s.jpg

 

single_ngc1501_imx249_1s.jpg

http://www.astrokraa...1_imx249_1s.jpg

 

single_ngc7331_imx249_1s.jpg

http://www.astrokraa...1_imx249_1s.jpg

 

 

As you can see, it takes quite a bit of stacking and processing... 

 

These frames are uncorrected (no darks, no row noise correction, the color image has been debayered - 2x2 superpixel - but NOT color corrected.. I process the color images raw of course using bayer drizzle in AS!2)



#11 Alterf

Alterf

    Viking 1

  • *****
  • Posts: 881
  • Joined: 07 Apr 2006

Posted 19 October 2015 - 03:08 PM

Ah, thanks for the frames.  Very informative!

 

Val



#12 JoseBorrero

JoseBorrero

    Soyuz

  • *****
  • Posts: 3,742
  • Joined: 04 Sep 2009

Posted 21 October 2015 - 06:24 AM

Thanks :waytogo:



#13 J.P.M

J.P.M

    Gemini

  • *****
  • Posts: 3,351
  • Joined: 14 Nov 2006

Posted 23 October 2015 - 05:32 AM

Beautiful work!



#14 josh smith

josh smith

    Fly Me to the Moon

  • *****
  • Posts: 5,366
  • Joined: 13 Oct 2013

Posted 24 October 2015 - 09:13 AM

Pretty awesome stuff there!

#15 Mert

Mert

    Cosmos

  • *****
  • Posts: 8,252
  • Joined: 31 Aug 2005

Posted 24 October 2015 - 03:17 PM

Great stuff Emil, very inspiring work!

You have a great combination there, excellent optics and excellent processing

software. AS!2 is really amazing.




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