M67 - Open Cluster in Cancer

Posted by ayiomamitis
on Tuesday, February 8, 2011


by Anthony Ayiomamitis

Open cluster NGC 2682 is one of two major open clusters in Cancer (along with M44). It is one of the oldest known clusters with estimates ranging from 3.2 to 10 billion years of age (a recent study suggests 4.0 billion years of age). It has an apparent diameter similar to that of the full moon and is comprised of approximately 500 member stars including 200 white dwarfs. The dominant member stars include SAO 98178 (mag 7.83) lying to the northeast and several stars to the south whose magnitudes range from 9.77 to 10.8 (all yellow giants are characteristic of the advanced age of the cluster). The cluster was discovered by Johann Gottfried Koehler prior to 1779 and independently rediscovered and catalogued by Messier in 1780. The cluster lies than two degrees from Acubens (α-Cancrii, mag 4.25) and lies overhead around midnight during winter. 

Technical Details:

Date: Feb 5-6, 2011 @ 23:05 - 01:10 UT+2


Location: Athens, Greece (38.2997° N, 23.7430° E)

Equipment: AP 160 f/7.5 StarFire EDF, AP 1200GTO GEM, SBIG ST-10XME, SBIG CFW10, SBIG LRGB + IR-block

Integrations: LRGB @ 30:30:30:30 using 3-/6-min subs, 1x1 binning, 1.16" per pixel, CCD @ -30.0° C

Further Details: http://www.perseus.gr/Astro-DSO-NGC-2682.htm


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