Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
sgottlieb
sage
Reged: 07/22/07
Posts: 237
Loc: SF Bay area
|
Re: Listings for brightest star magnitudes in clus
08/05/08 10:40 PM
|
|
|
Quote:
I've seen open cluster data which listed the visual magnitude of the *fifth* brightest member. I assume this was done so as to indicate at what limit your instrument should reach in order to get at least some resolution into stars. I believe this was done by some compiler decades ago (Shapley, perhaps?), and is no longer continued.
George Abell listed galaxy cluster magnitudes using the 10th brightest cluster member, though I don't recall seeing this for clusters. Makes sense, though, particularly for globulars.
--------------------
Steve Gottlieb
18" f/4.3 Starmaster
Adventures In Deep Space - New article on MASH planetaries
7500+ NGC/IC Visual Descriptions
NGC/IC Project
|
|
0 registered and 3 anonymous users are browsing this forum.
Moderator: matt, Olivier Biot
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Rating:
Thread views: 221
|
|
|
|
|
|
|
Previous
Index
Next
Flat
Edit
Reply
Quote
