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 6115 (13,702 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




finder chart

altitude today

altitude (year)


½°, , in DOCdb

show browsing

NGC 6115

NGC 6115, C 1620-518, Cl Ruprecht 118, Ocl 960, h 3625, GC 4179

RA: 16h 24m 36s
Dec: −51° 58′ 0″

Con: Norma
Ch: MSA:1498, U2:432, SA:22

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

(reference key)

Type: open cluster, 12p

Mag: B=10.29, V=9.8

Size: 3′
PA: ?

Historical observations

John Herschel (1847) Cape Observations

Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a part of the milky way, so immensely rich as to be one cast cluster of clusters."

Published comments

Sulentic & Tifft (1973)

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

Vogt. N. & Moffat, AFJ (1973)

Ruprecht 118

Vogt. N. & Moffat, AFJ (1973), "Southern Open Star Clusters III." Astron.Astrophys.Suppl., 10, 135-193. [image, table]

"Assuming five of the observed stars to be members of a group .. we derive d = 1.34 kpc, earliest Sp = B8 .These parameters are very tentative. The reality of the cluster is somewhat doubtful."

Contemporary observations

Auke Slotegraaf

1993 May 24

Ruprecht 118

Observing with a 6-inch f/8.6 Newtonian on 24/05/93 at 52x & 72x, this cluster shows as a ghostly sheen of nebulous light to the east of Ru 116. One star in the cluster, near the western edge, can be seen -- it is 11..12th mag. The rest of the cluster is an unresolved nebulous glow, extended east-west. It was not easily seen, and lost at 144x.

Ru 116 and Ru 118 forms a very nice contrasting pair, just like the binocular view of M46 & M47 or NGC 2477 & NGC 2451.

Magda Streicher

(no date)

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

12-inch f/10 SCT (76x, 218x)

Start again with Gamma and draw an imaginary line 2o right south east to discover a feast of clusters. The centre of attention is NGC 6115 that displays a rich scattering of faint stars accompany three Ruprecht clusters in a very busy star field. Try to sort out this bundle of joy is quite a challenge. They all mingle well with each other in the northern fringes of the rich Norma cloud. Round splash of faint stars, next to Ruprecht 118 to its east. Field very busy to the SE. Ruprecht 116 seen as a faint gathering of stars about 6' to the SW seen easier.

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.