#1  
Old 12-01-2021, 11:54 PM
TrevorW
Registered User

TrevorW is offline
 
Join Date: Aug 2006
Location: Western Australia
Posts: 7,852
Ngc3532

NGC 3532, also commonly known as the Pincushion Cluster, Football Cluster, the Black Arrow Cluster and the Wishing Well Cluster, is an open cluster some 405 parsecs from Earth in the constellation Carina.
Distance: 1,321 ly (405 pc)
Constellation: Carina
Apparent magnitude (V): 3

QHY8 CCD 55 min in 10 frames DSS PS CS2
Attached Thumbnails
Click for full-size image (ngc3532 55 10f 6d 5fl v7a.jpg)
230.8 KB44 views
Reply With Quote
  #2  
Old 13-01-2021, 07:43 AM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Sydney
Posts: 22,060
Nice shot.
Reply With Quote
  #3  
Old 13-01-2021, 07:57 AM
gregbradley's Avatar
gregbradley
Registered User

gregbradley is offline
 
Join Date: Feb 2006
Location: Sydney
Posts: 17,877
Lovely Trevor.

I think this is the open cluster that was so beautiful in a visual session recently.

Greg.
Reply With Quote
  #4  
Old 13-01-2021, 09:47 AM
Placidus (Mike and Trish)
Narrowing the band

Placidus is offline
 
Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 3,719
Hopefully constructive thoughts: I think you've got excellent data there, but the processing is letting you down. Easily fixed.


The cluster stars are blue-white. That's good. But the background Milky Way stars are the same colour. They can't all be OB stars! Have a look at some of Mike Sidonio's wide-field shots where the Milky Way stars are, as they should be, quite orange, like golden sand.


Secondly, you've pushed the background (too much curves) too hard, so that the background is gritty/blotchy instead of near black, and the main cluster stars, instead of being sparkling gems, are bloated spheres.


You should not need to use any noise reduction at all on an image like this.



These things should be very easy to fix.


Very best,
Mike
Reply With Quote
  #5  
Old 13-01-2021, 10:09 AM
TrevorW
Registered User

TrevorW is offline
 
Join Date: Aug 2006
Location: Western Australia
Posts: 7,852
Actually that's not blotchy IMO there's a lot of background nebula in that region so I needed to apply aggressive curve to bring that out, the halo effect was applied by Starfilter Lite, attached is a little less aggressive image less halo effect
Attached Thumbnails
Click for full-size image (ngc3532 55 10f 6d 5fl v6.jpg)
215.9 KB22 views
Reply With Quote
  #6  
Old 13-01-2021, 10:54 AM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Sydney
Posts: 22,060
I like the fact you've pushed the background to show the red neb but why did you want to bring up star halos? Is that a plugin?
Reply With Quote
  #7  
Old 13-01-2021, 11:00 AM
Placidus (Mike and Trish)
Narrowing the band

Placidus is offline
 
Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 3,719
That's hugely better now

For what its worth, here's our Ha LRGB version: https://photos.smugmug.com/Category/...ach%204096.jpg. You are right about the nebulosity. Notice the large number of red giants in the cluster itself. They are just starting to become differentiated in your repro.

Last edited by Placidus; 13-01-2021 at 11:12 AM.
Reply With Quote
  #8  
Old 13-01-2021, 11:26 AM
TrevorW
Registered User

TrevorW is offline
 
Join Date: Aug 2006
Location: Western Australia
Posts: 7,852
Thanks forthe advice, how many hrs data in your capture, very nice
Reply With Quote
  #9  
Old 13-01-2021, 12:51 PM
Placidus (Mike and Trish)
Narrowing the band

Placidus is offline
 
Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 3,719
Quote:
Originally Posted by TrevorW View Post
Thanks forthe advice, how many hrs data in your capture, very nice

Ta. H-alpha 5 hrs. RGB 26 minutes each. Aspen CG16M. 20 inch PlaneWave.

Last edited by Placidus; 13-01-2021 at 03:15 PM.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 10:14 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Testar
Advertisement