Astrophotography by Anthony Ayiomamitis

Deep Sky Object Image Gallery

Open star clusters are widely distributed in our galaxy and represent a loose collection of stars which number from a few dozen to a few hundred stars and are weakly-held gravitationally. Perhaps the three most famous such open clusters are the Pleiades (M45) in Taurus, the Beehive (M44) in Cancer and the double cluster in Perseus. They are all characterized with a handful of hot and white prominent stars and nebular material surrounding these stars.

Note: The open cluster NGC 7686 in Andromeda is a bright but poorly populated cluster comprised of at most 50 member stars which surround the bright orange star HIP 115996 (mag 6.19). It lies at a distance of 3260 light-years away with an apparent diameter of 14'. It is poorly detached from the background and which can make its observation difficult. This cluster was discovered in Herschel in 1787. NGC 7686 lies in the northeast section of Andromeda and seven degrees to the east of -And (mag 3.86). The cluster is best observed using low magnifications during late summer and early fall when it is placed directly overhead when looking due east.

Please click on the image below to display in higher resolution (1200 x 900)

Image Details
NGC 7686 - Open Cluster in Andromeda
Imaging Details
NGC Number:
7686

Common Name(s):
N/A

Other Designations:
Cr 456, OCL 251

Object Type:
Open Cluster

Object Classif:
III 2 p

Constellation:
Andromeda

RA / Dec:
23h 29m 52s /
49 08' 48"


Distance:
3260 light-yrs

Object Size:
14' x 14'

Magnitude:
5.6
Date:
Aug 20, 2007
00:00 - 02:10 UT+3


Location:
Athens, Greece

Equipment:
AP 160 f/7.5 StarFire EDF
AP 1200GTO GEM
SBIG ST-2000XM
SBIG CFW10
SBIG LRGB + IR-block


Integrations:
Lum :  030 min (10 x 3 min)
Red :  030 min (05 x 6 min)
Green :  030 min (05 x 6 min)
Blue :  030 min (05 x 6 min)
Dark :  135 min (15 x 3+6 min)
Flat :  ~ 36,500 ADU
Binning :  1x1 (Lum),  1x1 (RGB)

Temperatures:
Ambient : + 28.4 C
CCD Chip : - 05.0 C

Software:
CCDSoft V5.00.182
AIP4Win V2.1.19
Photoshop CS2