A Space & astronomy forum. SpaceBanter.com

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

Low Surface Brightness IC 302



 
 
Thread Tools Display Modes
  #1  
Old April 18th 16, 06:42 AM
WA0CKY WA0CKY is offline
Senior Member
 
First recorded activity by SpaceBanter: Feb 2008
Posts: 689
Default Low Surface Brightness IC 302

IC 302 is a low surface brightness spiral in eastern Cetus. It's distance is a bit vague. Redshift puts it at 261 million light-years but the median of one set of Tully-Fisher measurements say 181 million light-years while the average says 194 million light-years. The redshift distance is likely severely compromised by its motion through space as it implies a size of 176,500 light-years. Quite a large value for a low surface brightness galaxy. The Tully-Fisher measurements imply a size of 122,000 to 131,000 light-years. Still large but at least in the reasonable range.

NED and Seligman classify it as SB(rs)bc. The bar is obvious. The northern arm coming from the ring is well defined with lots of star clouds. The southern arm is quite fuzzy and rather straight. One paper (http://iopscience.iop.org/article/10.1086/521358/pdf ) describes this galaxy as: "From the global distribution of optical_light, this galaxy appears asymmetric. Our images show an apparently multiple set of faint southern arms and a strong southern dust lane. The red central region, including the bar, and the bluer ring and arms are emphasized in the B-I color index map."

This galaxy somehow managed to escape detection until Stephane Javelle found it on December 15, 1892. Yet another image compromised by poor seeing and transparency. Pretty much the norm unfortunately. NED had nothing much on the field so no annotated image this time.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

Rick
Attached Thumbnails
Click image for larger version

Name:	IC0302L4X10RGB2X10.JPG
Views:	609
Size:	334.0 KB
ID:	6196  Click image for larger version

Name:	IC0302L4X10RGB2X10CROP125.JPG
Views:	275
Size:	85.1 KB
ID:	6197  
  #2  
Old April 19th 16, 09:19 PM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default Low Surface Brightness IC 302

Rick,

IC 302 looks very faint indeed in Guide 9. Remarkable that you could get
such a good picture of this galaxy.

Stefan


"WA0CKY" schrieb im Newsbeitrag ...


IC 302 is a low surface brightness spiral in eastern Cetus. It's
distance is a bit vague. Redshift puts it at 261 million light-years
but the median of one set of Tully-Fisher measurements say 181 million
light-years while the average says 194 million light-years. The
redshift distance is likely severely compromised by its motion through
space as it implies a size of 176,500 light-years. Quite a large value
for a low surface brightness galaxy. The Tully-Fisher measurements
imply a size of 122,000 to 131,000 light-years. Still large but at
least in the reasonable range.

NED and Seligman classify it as SB(rs)bc. The bar is obvious. The
northern arm coming from the ring is well defined with lots of star
clouds. The southern arm is quite fuzzy and rather straight. One paper
(http://iopscience.iop.org/article/10.1086/521358/pdf ) describes this
galaxy as: "From the global distribution of optical_light, this galaxy
appears asymmetric. Our images show an apparently multiple set of faint
southern arms and a strong southern dust lane. The red central region,
including the bar, and the bluer ring and arms are emphasized in the B-I
color index map."

This galaxy somehow managed to escape detection until Stephane Javelle
found it on December 15, 1892. Yet another image compromised by poor
seeing and transparency. Pretty much the norm unfortunately. NED had
nothing much on the field so no annotated image this time.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

Rick


--
WA0CKY

 




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
Low Surface Brightness IC 239 WA0CKY Astro Pictures 0 February 22nd 16 08:20 AM
IC 1158 A Somewhat Low surface brightness spiral WA0CKY Astro Pictures 0 October 5th 15 06:34 AM
NGC 5300 A low surface brightness spiral WA0CKY Astro Pictures 1 June 14th 15 08:05 PM
surface brightness and photons [email protected] Amateur Astronomy 22 April 15th 05 01:42 AM
Surface brightness of Mars M. Tettnanger Amateur Astronomy 4 September 3rd 03 08:42 PM


All times are GMT +1. The time now is 12:53 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 SpaceBanter.com.
The comments are property of their posters.