Deep Sky Object in Spring
Omega Cluster (NGC5139 in Centaurus)

Date & Time: Feb 24 2001, 26:46 JST(+0900), 15min. Exp.
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with IDAS LPS-P1 Light-pollution cut filter
Auto-guided with TAKAHASHI JP Equatorial & Meade Pictor 201XT
Camera: VIXEN VX-1
Film: Konica NEW Centuria 800
Location: Ooizumi vil., Yamanashi pref.

NGC5139 / Globular Cluster, type VIII
R.A.13h 26m 48.0s (2000.0)
Dec.-47° 29' 00" (2000.0)
Apparent Size36.3'
Real Size160 light yrs.
Distance16,000 light yrs.
The Omega Cluster, NGC5139, is the largest globular cluster in heavens. The apparent size is over half of degree. But the cluster culminates at only 7 degrees around Tokyo; it needs extremely clear sky to enjoy the splendid cluster at the Northern Hemisphere. The cluster has the magnitude of 3.7; you can detect it with naked eyes under dark night. The omega cluster forms the constellation of Centaurus as a star of omega Centauri, registered as a normal star before discovered that it was a globular cluster.
You can resolve individual stars in the outer region only with binoculars, and the view through small scopes should be extremely splendid.



Copyright(c) 2001 by Naoyuki Kurita, All rights reserved.
To top page To Deepsky in Spring index Centaurus