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 6847 (15,936 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

Warning: fopen(/home/yivumoo/public_html/logs/showobject/20220120.txt): failed to open stream: Disk quota exceeded in /home/yivumoo/public_html/show_object.php on line 168

Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/yivumoo/public_html/show_object.php on line 181

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/yivumoo/public_html/show_object.php on line 182

show browsing

NGC 6847

NGC 6847, LBN 151, Sh 2-97, LBN 066.74+00.86, II 202, GC 4527

RA: 19h 56m 37.7s
Dec: +30° 12′ 46″

Con: Cygnus
Ch: MSA:1172, U2:119, SA:8


(reference key)

Type: open cluster

Mag: B=14.72, V=13.06

Size: 30′
PA: ?

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

NGC 6847 may be the cluster and HII region 1 degree north and 30 seconds west of WH's single position. There is certainly nothing near his place, and these objects may well be the ones he saw. They are immersed in a fairly large star cloud in the Milky Way, which might have led to WH's comments about the surround area. His full description, given by Dreyer in the Collected Papers of 1912, reads, "A resolvable nebulous patch; there are great numbers of them in this neighborhood like forming nebulae; but this is the strongest of them; they are evidently congeries of small stars."

Another possibility is raised by Dreyer's note in the NGC, "Not noticed by d'A, who has 2 observations of GC 5947 = m 403 [= NGC 6842, a planetary]." Is N6842 the object that WH saw? It is just 2 minutes of time preceding and 3 arcmin south of his position. There may be enough stars around the nebula to lead to WH's description, but I suspect not.

Two other possibilities are nearby on the POSS prints. First is a clump of stars about 20 arcmin north of WH's position. The second is another clump about 55 arcmin south. Neither of these, however, has "great numbers" of similar clumps nearby.

Dreyer notes that Bigourdan found no nebulosity at WH's place, though he searched the area four times. His one micrometric observation (I haven't reduced it) probably points at a double or multiple star. There are many of them around.

Finally, using the POSS1 overlays, I thought that this might be identical to " NGC 6846 " (which see). However, the overlay copies RNGC's 2 degree error in the declination for N6846 so that it lands on top of the cluster and HII region I noted at the beginning of this story. N6846 is not these objects, though as I said, N6847 might just be.

Historical observations

William Herschel (c.1784)

Synonyms: H II-202

Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "A resolvable nebulous patch of stars." In the Notes, Dreyer quotes from the Register: "Sweep 239, July 17, 1784. 'A resolvable nebulous patch; there are great numbers of them in this neighbourhood like forming nebulae, but this is the strongest of them; they are evidently congeries of small stars.' According to Bigourdan, there is no second class nebula here; a region rich in stars, but if there is any nebulosity about it, it is very diffused (4 obs.)." in the Notes to the NGC, Dreyer comments that it was not noticed by d'Arrest.

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NF DC.

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.

Warning: Unknown: open(/tmp/sess_4cc9b128e2ea38e5fb006c9f3a986f91, O_RDWR) failed: Disk quota exceeded (122) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct () in Unknown on line 0