A Space & astronomy forum. SpaceBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » SpaceBanter.com forum » Others » Astro Pictures
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

ASTRO: NGC 2903



 
 
Thread Tools Display Modes
  #1  
Old March 15th 07, 08:05 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
external usenet poster
 
Posts: 3,085
Default ASTRO: NGC 2903

Stefan and I imaged this guy about the same time. I had taken something
low in the sky just before and had set the blue exposure time to 7
minutes to compensate for the loss of blue low in the sky. I forgot to
reset to 5 when shooting this one. This means I got blue data in the
dimmer parts of the image that didn't show much color data at all in the
red and green images. Thus, the faint outer arms as well as the
companion to the east (left) came out too blue where really faint. I've
spent three days trying to fix it. Not being a photoshop expert it
hasn't gone well. I just have had my fill and posting where I'm at.
Think I have 2903 about right but the companion UGC 5086 has a red
center and blue halo I doubt is correct. Fixing that screws up 2903
unless I isolate it and adjust only one which I don't like to do. Other
faint galaxies show the same problem. LEDA 1648681 below 2903 is
another example.

Aladin says I picked up a QSO but it also says it is mag 20.9V. No way
this shot went anywhere near that deep. The star barely shows on the
Red POSS 2 plate though shows about like my shot on the blue. My
software puts it at 19.0 which looks right to me. So is the QSO hiding
behind a 19th mag star? It's B 0929+218 for those curious enough to
look it up.

14" [email protected]/10, L=6x5' RG=3x5' B=3x7' all binned 2x2, STL-11000XM,
Paramount ME

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

Attached Thumbnails
Click image for larger version

Name:	NGC2903LUM6X5RG3X5B3X7R.jpg
Views:	251
Size:	218.8 KB
ID:	533  
Ads
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
ASTRO: NGC 2903 Stefan Lilge Astro Pictures 4 March 17th 07 06:36 AM
Astro: NGC 2903 Rick Johnson[_2_] Astro Pictures 5 December 26th 06 05:59 PM
Unsung NGC 2903 [email protected] Amateur Astronomy 12 May 3rd 06 08:30 PM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] Astronomy Misc 0 September 30th 04 02:23 AM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] SETI 0 September 30th 04 02:23 AM


All times are GMT +1. The time now is 06:26 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2004-2018 SpaceBanter.com.
The comments are property of their posters.