NGC 2158 (Lund 205, Cr 81) Open Cluster in Gemini

Located at: RA 06 hours 07 minutes 26 seconds, Dec +24 degrees 05 minutes 48 seconds

Size: 5.0' Magnitude: 8.6 Class: II 3 r

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

  ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 420 minutes (42 x 10 minute subs), 01/14/15/2009; seeing 2.6-3.6 FWHM per CCDStack

Processing:

CCDStack 1.4.1, Photoshop 7.0

Location:

 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes:

This image replaces an unfiltered 125 minute sequence from 01/19/2006. This rich little open cluster forms a close pair with M 35 (M 35 is centered in this image, about 26 minutes to the NNE).

See the 14.5" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 2158

NGC 2158 = Mel 40 = Cr 81
06 07 26 +24 05.8
V = 8.6;  Size 5

17.5": 30-35 stars resolved, unusually rich, compact, about 5' diameter.  The 
appearance is similar to a resolved globular cluster.  Located 30' SW of M35.

13": ~15-20 stars, mottled clump near SE edge.

8": few stars resolved over haze.

Discovered by WH (VI 17). Listed as a globular in the RNGC.  This is an old open 
cluster (> 1 billion years old).

- by Steve Gottlieb