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 5820 (12,786 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/20200706.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 5820

NGC 5820, Arp 136, LEDA 53511, MCG+09-25-001, UGC 9642, II 756, h 1898, GC 4029, GC 4025

RA: 14h 58m 40.05s
Dec: +53° 53′ 9″

Con: Bo÷tes
Ch: MSA:569, U2:50, SA:2


(reference key)

Type: galaxies (interacting), E/S0

Mag: B=13, V=?

Size: 1.819′ x 1.445′
PA: 97°

Historical observations

William Herschel

Synonyms:H II-756

Discovered in 1788 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "pB, pL, iF, resolvable."

Webb, T.W. (1893)

In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "faint, guide to 7.5 mag pair following, from which a straight line of small stars extends."

Published comments

Arp (1966)

Listed as No. 136 in Arp's "Atlas of Peculiar Galaxies" (Astrophysical Journal Supplement, vol. 14, 1966.) He remarks "faint streamers off one end of eastern galaxy."

Burnham's Celestial Handbook

Burnham calls it a 12.8 mag elliptical galaxy in Bootes, measuring 0.7' x 0.3', which is bright, elongated, suddenly brighter in the middle, with faint extensions on the southeastern side. A bright double star, Sh 191, lies 8' east.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 13.0 mag galaxy. Their coded description reads SLEL,BM.

Modern observations

Steve Coe

Steve Coe, using a 13" f/5.6, notes: "Pretty bright, pretty small, elongated 1.5 X 1 in PA 90 and much brighter in the middle at 100X. Raising the power to 220X shows off a stellar nucleus. There are two very faint companions to the east."

Brian Skiff

= Arp 136

RC3: V=12.5/13.0

NGC: pa90.

star cats: 7'.97 WNW of primary of ADS 9474 (V=6.8,7.6; 41"; 343)

15cm - f, W of wide pair.

- mod f & vsm W of wide pair of *s. 35"x25", elong E-W w/mod sharp concen

to consp *ar nuc. BS, 15May1991, Texas Star Party.

25cm - vsm, pa90?, 0'.7x0'.3. sm, sharp, prob *ar nuc. well-def halo.

30cm - found 8' W of nice m6.5 1' dbl. quite sm, sl less than 1' diam w/mottled

halo. 20" core. fair concen.

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_f69f4d00ef7e10d0aea2f30f72030d1e, 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