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: Open cluster NGC 1647 in Taurus depicted below is a bright and rich open cluster comprised of over 100 member stars which are well interspersed and detached from the background sky. The cluster is dominated by many mag 8 and mag 9 stars with its brightest star being mag 8.3 (SAO 94100). The cluster spans 40 arc-minutes in diameter, lies 1760 light-years away and has been estimated to be about 145 million years-old. The cluster is best observed using low magnifications (50-100x) during winter when it is directly overhead and can be found to lie just to the northeast of Aldebaran (-Tau, mag 0.87). NGC 1647 was discovered by Friedrich Wilhelm Herschel (1738-1822) in 1784.

Note: There exist faint traces of nebulosity around the brighter stars and which may be misinterpreted as light pollution.

Please click on the image below to display in higher resolution (1200 x 950)

Image Details
NGC 1647 - Open Cluster in Taurus
Imaging Details
NGC Number:
1647

Common Name(s):
N/A

Other Designations:
Cr 54, OCL 457

Object Type:
Open Cluster

Object Classif:
II 2 r

Constellation:
Taurus

RA / Dec:
04h 45m 57s /
19 06' 36"


Distance:
1760 light-yrs

Object Size:
40'

Magnitude:
6.4
Date:
Nov 04-05, 2010
23:40 - 01:50 UT+2


Location:
Athens, Greece

Equipment:
AP 160 f/7.5 StarFire EDF
AP 1200GTO GEM
SBIG ST-10XME
SBIG CFW10
SBIG LRGB filters


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)
Binning :  1x1 (Lum),  1x1 (RGB)

Image Scale:
1.16" per pixel

Temperatures:
Ambient : + 16.0 C
CCD Chip : - 25.0 C

Software:
CCDSoft V5.00.201
CCDStack V1.6.0.5
eXcalibrator V1.0.3.0
Aladin V6
Photoshop CS2