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: Comet Garradd



 
 
Thread Tools Display Modes
  #1  
Old September 1st 11, 07:29 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
external usenet poster
 
Posts: 3,085
Default ASTRO: Comet Garradd

I'm late with this one. Processing it gave me fits. Normally I find it
easy to remove the stars with a data rejection stacking once the images
are aligned on the comet's core. I found that impossible due to the
dense star background. Getting rid of the comet is easy with a gradient
tool and a bit of cloning out what little remains. I finally got rid of
the stars in the luminance frame but the color frame was far more
difficult. After days of swearing I finally managed it. I'm now way
behind on my normal processing backlog.

I debated on how to handle the ton of stars seen through the comet's
tail. I ended up blocking the vast majority of the faint ones. Just
detracted too much from the comet. So only the brighter were allowed to
show with the fainter ones masked out in the star field image.

This one seems to be a case of too much aperture picking up too many stars.

Comet's color wasn't nearly as strong as on some other posted images.
Probably needed more color but the clouds had other ideas unfortunately.

All those stars made for a larger file than I'd like but when I lowered
the compression the comet didn't fair very well.

14" LX200R @ f/10, L=30x1' RGB=10x1', STL-11000XM, Paramount ME
--
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:	GARRADD-L30X1RGB10X1.JPG
Views:	499
Size:	669.4 KB
ID:	3711  
Ads
  #2  
Old September 2nd 11, 10:34 PM
WA0CKY WA0CKY is offline
Senior Member
 
First recorded activity by SpaceBanter: Feb 2008
Posts: 689
Default

Quote:
Originally Posted by Rick Johnson[_2_] View Post
I'm late with this one. Processing it gave me fits. Normally I find it
easy to remove the stars with a data rejection stacking once the images
are aligned on the comet's core. I found that impossible due to the
dense star background. Getting rid of the comet is easy with a gradient
tool and a bit of cloning out what little remains. I finally got rid of
the stars in the luminance frame but the color frame was far more
difficult. After days of swearing I finally managed it. I'm now way
behind on my normal processing backlog.

I debated on how to handle the ton of stars seen through the comet's
tail. I ended up blocking the vast majority of the faint ones. Just
detracted too much from the comet. So only the brighter were allowed to
show with the fainter ones masked out in the star field image.

This one seems to be a case of too much aperture picking up too many stars.

Comet's color wasn't nearly as strong as on some other posted images.
Probably needed more color but the clouds had other ideas unfortunately.

All those stars made for a larger file than I'd like but when I lowered
the compression the comet didn't fair very well.

14" LX200R @ f/10, L=30x1' RGB=10x1', STL-11000XM, Paramount ME
--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".
I see in fuzzing out the stars for the comet composite I did so in a way that created two false "jets" in the coma. I did it differently and they are mostly gone now.

Rick
Attached Thumbnails
Click image for larger version

Name:	GARRADD-L30X1RGB10X1r.jpg
Views:	86
Size:	669.4 KB
ID:	3712  
  #3  
Old September 3rd 11, 08:53 PM posted to alt.binaries.pictures.astro
George[_6_]
external usenet poster
 
Posts: 124
Default ASTRO: Comet Garradd



"Rick Johnson" wrote in message
. com...

I'm late with this one. Processing it gave me fits. Normally I find it
easy to remove the stars with a data rejection stacking once the images
are aligned on the comet's core. I found that impossible due to the
dense star background. Getting rid of the comet is easy with a gradient
tool and a bit of cloning out what little remains. I finally got rid of
the stars in the luminance frame but the color frame was far more
difficult. After days of swearing I finally managed it. I'm now way
behind on my normal processing backlog.

I debated on how to handle the ton of stars seen through the comet's
tail. I ended up blocking the vast majority of the faint ones. Just
detracted too much from the comet. So only the brighter were allowed to
show with the fainter ones masked out in the star field image.

This one seems to be a case of too much aperture picking up too many stars.

Comet's color wasn't nearly as strong as on some other posted images.
Probably needed more color but the clouds had other ideas unfortunately.

All those stars made for a larger file than I'd like but when I lowered
the compression the comet didn't fair very well.

14" LX200R @ f/10, L=30x1' RGB=10x1', STL-11000XM, Paramount ME
--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

HI Rick. Don't beat yourself up too badly. That's the best image of it
I've seen to date. Good work.

George

 




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
Comet Garradd Visits M71 Marty[_3_] Amateur Astronomy 17 August 28th 11 07:57 PM
Comet Garradd again... Marty[_3_] Amateur Astronomy 14 August 27th 11 06:45 AM
Comet Garradd Anybody? Marty[_3_] Amateur Astronomy 5 August 11th 11 09:10 PM
ASTRO: comet C/2007 E1 Garradd astrobry Astro Pictures 2 April 24th 07 12:44 AM


All times are GMT +1. The time now is 10:44 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright 2004-2020 SpaceBanter.com.
The comments are property of their posters.