sponsored by psychohistorian.org


Deep Sky Observer's Companion – the online database


Welcome, guest!

If you've already registered, please log in,

or register an observer profile for added functionality.


log in to manage your observing lists























Full database:

Entire DOCdb database of 18,816 objects.



NGC 7039 (16,607 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




finder chart

altitude today

altitude (year)


½°, , in DOCdb

Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/yivumoo/public_html/show_object.php on line 167

show browsing

NGC 7039

NGC 7039, Cl Collinder 431, C 2109+454, Ocl 203.0, COCD 495, h 2107, GC 4645

RA: 21h 10m 48s
Dec: +45° 37′ 0″

Con: Cygnus
Ch: MSA:1106, U2:85, SA:9

Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 42m

Mag: B=8.06, V=7.6

Size: 14′
PA: ?

History and Accurate Positions for the NGC/IC Objects (Corwin 2004)

NGC 7039 is a very large cluster about 20 arcmin long and 7 arcmin wide. Though JH says it is "Extended from nf to sp," it is actually extended from the southwest (sp) to the northeast (nf). I suspect this is a simple error on JH's part, though visual observers might want to have a look at the cluster to be sure.

The position that JH gives is for SAO 50547 on the northeastern edge of the cluster. On POSS1, DSS, and GSC, there are two overlapping concentrations of stars within the cluster. The position in the main table is for a point midway between the centers of these concentrations.

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 7.0 mag open cluster.

Modern observations

MacRobert, Alan M

MacRobert calls this cluster "a large faint well-resolved sprinkling of stardust, elongated east-northeast to west-southwest. Its nearly half a degree across; its 50 stars are magnitude 11 and fainter."

Brian Skiff

15cm - vrich fld @ 50x, but looks like abs hole. BS, 17Jun1991, Anderson Mesa.

25cm - smlr than but sim to oc I1369 1deg S. cl lies btwn two m7.5 *s. 20 *s

in 10'x5' area, spreads to 20'x7 w/40 *s, most are m11-12. BS,


Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

Named DSOs

Object search

First search phrase


Second search phrase

Type of object to include:

open cluster
globular cluster
planetary nebula
bright nebula
dark nebula
galaxy cluster
asterism & stars

The Bug Report

DOCdb is still in beta-release.

Known issues, feature requests, and updates on bug fixes, are here:

> Bug Report


Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!

> Contact us


DOCdb is a free online resource that exists to promote deep sky observing.

You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.

> Find out more

Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.