M 48 (NGC 2548, Lund 439) Open Cluster in Hydra

Located at: RA 08 hours 13 minutes 44 seconds, Dec -05 degrees 45 minutes 00 seconds

Size: 54'* (30') Magnitude: 5.8 Class: I 3 r

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56

Image:

Lumicon Deep Sky filter, 240 minutes (24 x 10 minute subs), 03/20/21/2008; seeing 2.7-4.0 FWHM per CCDStack

Processing:

CCDStack 1.3.2, Photoshop 7.0

Location:

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

Notes:*

M 48 is listed at 54 minutes in size ... way more than my imaging field of about 31' x 46' ... so the cluster members overfill this field. Notice three small 16th magnitude galaxies on eastern (left) side of the cluster.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 30 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 2548

NGC 2548 = M48 = Cr 179
08 13 43 -05 45.0
V = 5.8;  Size 54

13.1": about 125 stars in a large 40' field with no distinct borders.  A rich 
chain of stars oriented SSW-NNE passes through the center.  Includes a number of 
brighter mag 10 stars and many double stars.

- by Steve Gottlieb