Go Back   IceInSpace > General Astronomy > Observational and Visual Astronomy
Register FAQ Calendar Today's Posts Search

Reply
 
Thread Tools Rate Thread
  #1  
Old 22-08-2006, 09:15 AM
GrahamL's Avatar
GrahamL
pro lumen

GrahamL is offline
 
Join Date: Jun 2006
Location: ballina
Posts: 3,265
ngc ? 4945/4976

Hey there all

I was wondering how bright these pair are to view through a 10" newt ?
I spent a good hour trying to track them down last night without luck
c80 and c 84 were very bright and easy to see and I'm pretty sure I kept comeing back to the right field but there just wasn't anything there to see ?

I do have a rather nasty older style burn a hole in the road type street light out front which is pretty close to were i was looking .
Reply With Quote
  #2  
Old 22-08-2006, 09:36 AM
janoskiss's Avatar
janoskiss (Steve H)
Registered User

janoskiss is offline
 
Join Date: Jan 2005
Location: Sale, VIC
Posts: 6,033
4945 should be doable in a 10" from semi-dark skies. It's edge on, so surface brightness is relatively high.
Reply With Quote
  #3  
Old 22-08-2006, 12:21 PM
Starkler's Avatar
Starkler (Geoff)
4000 post club member

Starkler is offline
 
Join Date: Sep 2004
Location: Melbourne
Posts: 4,900
4945 is dead easy from dark skies, but a bit harder to see from suburban skies due to the fact that its fairly large, and doesnt have a bright core.
Reply With Quote
  #4  
Old 22-08-2006, 12:48 PM
sheeny's Avatar
sheeny (Al)
Spam Hunter

sheeny is offline
 
Join Date: Jun 2005
Location: Oberon NSW
Posts: 14,437
G'Day this is from my observations on Sunday night with 20 x80 T binoculars. I too have a burn a hole in the raod streetlight to content with (I hid around the corner from the other two!)

C83, NGC4945: Galaxy, just visible with direct vision. Clear with averted vision.

NGC4945A: Not visible. star visible with averted vision?

NGC4976: Not visible. star visible with averted vision?

You should be able to pick up NGC4945 easily in your dob, but it is edge on so it will appear as a fuzzy line not a disc.

Al.
Reply With Quote
  #5  
Old 22-08-2006, 05:47 PM
mickoking's Avatar
mickoking
Vagabond

mickoking is offline
 
Join Date: Sep 2005
Location: China
Posts: 1,477
NGC 4945 can sometimes be a bit tricky. It is bright but is also quite large and you can completely miss it if you are expecting something smaller. It is not too difficult in a 200mm Dob, even from an outer suburban location. NGC 4975 is much smaller but has a higher surface brightness than 4945 and thru my 300 Dob looks a bit like a very distant Globular cluster.
Reply With Quote
  #6  
Old 26-08-2006, 08:44 AM
GrahamL's Avatar
GrahamL
pro lumen

GrahamL is offline
 
Join Date: Jun 2006
Location: ballina
Posts: 3,265
Showed up easily at glens last night even in binocs

I sure was optimistic from home with the light from town directly below
Reply With Quote
  #7  
Old 26-08-2006, 09:26 AM
sheeny's Avatar
sheeny (Al)
Spam Hunter

sheeny is offline
 
Join Date: Jun 2005
Location: Oberon NSW
Posts: 14,437
Quote:
Originally Posted by mickoking
NGC 4945 can sometimes be a bit tricky. It is bright but is also quite large and you can completely miss it if you are expecting something smaller. It is not too difficult in a 200mm Dob, even from an outer suburban location. NGC 4975 is much smaller but has a higher surface brightness than 4945 and thru my 300 Dob looks a bit like a very distant Globular cluster.
Interesting comment. Might explain why I had no problems with binocs but its not so easy in a bigger scope!

Al.
Reply With Quote
  #8  
Old 26-08-2006, 09:27 AM
sheeny's Avatar
sheeny (Al)
Spam Hunter

sheeny is offline
 
Join Date: Jun 2005
Location: Oberon NSW
Posts: 14,437
Quote:
Originally Posted by nightstalker
Showed up easily at glens last night even in binocs

I sure was optimistic from home with the light from town directly below
So are you going to have another go from home? It would be interesting to see how you go this time!

Al.
Reply With Quote
  #9  
Old 26-08-2006, 10:32 AM
GrahamL's Avatar
GrahamL
pro lumen

GrahamL is offline
 
Join Date: Jun 2006
Location: ballina
Posts: 3,265
Yes I will sheeny, but not to early in the night as well as "ole blazer" out front most of the towns sporting fields lie directly below this area of sky
I don't think it I'll see it to be honest the , background light is very close to the galaxys methinks so the two blend in perfectly.. which is prolly why despite looking .. and ..looking last week in the right spot I could never pick up any subtle changes that would give it away... but you never know
Reply With Quote
  #10  
Old 26-08-2006, 11:20 AM
sheeny's Avatar
sheeny (Al)
Spam Hunter

sheeny is offline
 
Join Date: Jun 2005
Location: Oberon NSW
Posts: 14,437
Yeah well, night lit sporting fields aren't astro friendly!!!

I thought the light pollution where I live was pretty bad - but maybe it isn't so bad afterall. I hate it though, just the same!

Al.
Reply With Quote
Reply

Bookmarks


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 11:52 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement