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 6871 (16,037 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 6871

NGC 6871, Cl Collinder 413, C 2004+356, Ocl 148.0, Ocl 148, COCD 476, h 2067, GC 4548

RA: 20h 06m 0s
Dec: +35° 47′ 0″

Con: Cygnus
Ch: MSA:1149, U2:119, SA:9

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

(reference key)

Type: open cluster, 22pn

Mag: B=5.43, V=5.2

Size: 29′
PA: ?


This cluster is possibly a member of the Cygnus OB 3 Association.

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 25' and the class as 4 3 p.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 6.0 mag open cluster.

Modern observations

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "5.2M; 20' diameter; 15-plus 7M members; large and sparse; bright star in the NE portion is 5.5M 27 CYG."

MacRobert, Alan M

MacRobert notes that although this cluster is catalogued as having only 15 stars very loosely spread over 20', "there's clearly more going on here, perhaps in the cluster's background. Two bright pairs in the cluster's middle are each surrounded closely by many fainter stars, more and more of them the longer you look. Here's a place to use high power."

Hartung, E.J. (1968) Astron.Obj.South.Tel

Hartung notes "a large field is needed for this bright scattered cluster on a profuse starry ground; it includes the bright orange 27 Cyg and amongst others an unequal pair (7.0 9.5; 11 arcsec, 300 deg), and is a good object for small apertures."

Brian Skiff

6cm - not vdistinct from Milky Way. nine brtr *s strung Swd from 27 Cyg. two

nice pairs on N side, N one colored. 27 Cyg orangish.

15cm - interesting mult * reminiscent of far-southern oc @ 80x. two grps nr m7

*s: Srn one incl nine *s as f as line of three m14 *s aligned E-W to S

of brtst; Nrn grp has six *s, fntst on S edge. BS, 15Oct1990, Anderson


25cm - brilliant @ 47x. 90x shows an array or close colored mult *s. on N is

27 Cyg. in center are br pairs, many w/close comps.

30cm - a rich fld w/dk areas to E&W. 80 *s or so in 25' diam cl.

Contemporary observations

Magda Streicher

(no date)

Alldays (22.50S, 20.12E, 770m).

12-inch f/10 SCT (95x, 218x)

Stars display a beautiful combination of various magnitude stars. Open feeling with two groups N and S. The southern grouping is more densted with more stars which had open spaces in between. Very busy star field and a few stars show up as double. Just 11' SW from 29 Cygni

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.