GALLERY

M103 (NGC 581), Open Cluster in Cassiopeia

LRGB combination (Click for a larger view 1800 x 1800 px)

 

Details

M103 (NGC 581), Open Cluster type 'd', in Cassiopeia

Discovered by Pierre Mechain in 1781.

Messier 103 (also known as M103, or NGC 581) is an open cluster where a few thousand stars formed in the constellation Cassiopeia.It is one of the "latest additions" (together with M101 and 102) to his catalog, which Charles Messier included from Pierre Mechain's report. The number of proven cluster members has been given as 40 by Wallenquist, while Becvar has 60, and Archinal and Hynes (2003) give a modern number of 172 member stars. M103 is one of the more remote open clusters in Messier's catalog, at about 8000 to 9500 light years and ranging about 15 light years apart. M103 is about 25 million years old.

Right Ascension 01 : 33.2 (h:m)
Declination +60 : 42 (deg:m)
Distance 8 - 9.5 (kly)
Visual Brightness 7.4 (mag)
Apparent Dimension 6 (arc min)

Seeing: Pickering 8 rating - Very Good
Optic(s): RC 12" with Astro-Physics corrector @ f/5.4
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik LRGB set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-08-19
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 12 min, R = 9 min, , G = 9 min, , B = 9 min, subs. 3 min, Bin 1, Total Exposure Time - 39 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided
Processing:

PixInsight / PS

GALLERY


All Contents copyright Velimir Popov unless otherwise noted.