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.
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.
|NGC5139 / Globular Cluster, type VIII|
|R.A.||13h 26m 48.0s (2000.0)|
|Dec.||-47° 29' 00" (2000.0)|
|Real Size||160 light yrs.|
|Distance||16,000 light yrs.|
You can resolve individual stars in the outer region only with binoculars, and the view through small scopes should be extremely splendid.