Quote:

---

Dave Chadsey wrote:

Quote:

---

As far as naming confusion goes, that's always been there. For instance, when you refer to Messier 51 do you mean NGC 5194 (also known as PGC 47404, Lord Rosse's Galaxy, and MCG-08-25-012) or do you mean the smaller galaxy known as NGC 5195, PGC 47413, etc.?

---

M51A is NGC 5194 and M51B is NGC 5195. However, these are catalog numbers with some official "sanction" if you will. The Caldwell numbers have no more validity than my "Knisely" numbers would. The Caldwell list contains quite a number of interesting and challenging targets for the deep-sky enthusiast and most are well worth pursuing as a follow-on to the Messier list. However, it would be best if the objects themselves were referred to using standard catalog numbers (this isn't prejudice; it is just standard scientific convention). Clear skies to you.

---

Exactly so.

Dave Mitsky

--------------------
Chance favors the prepared mind.
De gustibus non est disputandum.

Post Extras