NGC 1857 (Lund 159, Cr 61) Open Cluster in Auriga

Located at: RA 05 hours 20 minutes 06 seconds, Dec +39 degrees 20 minutes 36 seconds

Size: 5.0' (10') Magnitude: 7.0 Class: I 3 m

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -25c, camera control MaxIm DL 4.56

Image:

Red (Hoya 25A) filter, 150 minutes (15 x 10 minute subs), 01/23/2007

Processing:

CCDStack 1.1, Photoshop 7.0

Location:

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

Notes: This open cluster is centered on the bright star (SAO 57903, 6.5 magnitude) in the center of this image. The cluster is also on the southern periphery of the larger open cluster Czernik 20 (18', mag --, Cl: IV 1 p).

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 10 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 1857
NGC 1857 = Cr 61 = Mel 32 = OCL-428
05 20 06 +39 20.6
V = 7.0;  Size 6

13.1": 50-60 stars resolved surrounding mag 7.5 SAO 57903 near the center.  This 
is a very pleasing cluster and is rich in faint mag 13/14 stars.

- by Steve Gottlieb