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 5731 (12,582 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 5731

NGC 5731, IC 1045, LEDA 52409, MCG+07-30-047, UGC 9460, III 658, h 1868, GC 3980

RA: 14h 40m 9.1s
Dec: +42° 46′ 45″

Con: Bo÷tes
Ch: MSA:606, U2:77, SA:7

Ref: SIMBAD, Corwin

(reference key)

Type: galaxy (in pair), S

Mag: B=14, V=?

Size: 1.584′ x 0.407′
PA: 116°

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

NGC 5731; is it IC 1045? See NGC 5730 for a CGCG confusion. See IC 1045 for a Swift confusion. The identity with NGC 5731 is not in doubt, but there is some concerning IC 1045.

Historical observations

William Herschel (c.1784)

Synonyms: H III-658

Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "Two [NGC 5730 & NGC 5731] Both vF, vS, E in different directions, 2 or 3' distant in parallel, each south of a small star."

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 14.5 mag galaxy. Their coded description reads EON,IRRPERIPH,HISB EQDKLN SUSP,B KN OR* F END.

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.