M 103 (NGC 581, Lund 46, Cr 14) Open Cluster in Cassiopea

Located at: RA 01 hours 33 minutes 22 seconds, Dec +60 degrees 39 minutes 30 seconds

Size: 6.0' Magnitude: 7.4 Class: II 2 m

North is up

West to the right

Telescope:

14.5" f5 Newtonian reflector

Camera:

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

Image:

Lumicon Red filter, 310 minutes (31 x 10 minute subs), 09/25/26/2012; seeing 3.5-4.3 FWHM per CCDStack

Processing:

CCDStack 2.66.4490.32361, Photoshop CS5.1

Location:

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

Notes:

This is the 14.5" version ... see here for the 8" version ... I shot M 103 (and several other objects) while the nearly full moon interfered with imaging NGC 7479. I am noticing that the 14.5" blooms fainter stars than the 8", and makes longer, thus harder to process out, blooms ... as you can see around  the 'brighter' stars, it is very hard to process out all the artifacts created by the blooms. See this (one of 31) unprocessed 10 minute sub of this sequence ... no processing, just converted to .jpg format.

From the the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 581

NGC 0581 = M103 = Cr 14
01 33 22 +60 39.5
V = 7.4;  Size 6

13.1": 50-60 stars in cluster, fairly rich.  Includes several bright stars in a 
distinctive triangular wedge shape (mag 7.3 SAO 11822, mag 8.9 SAO 11824, mag 
8.3 SAO 11826 and mag 8.3 SAO 11829) with a bright orange star E of center.

- by Steve Gottlieb