sponsored by psychohistorian.org

DOCdb

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.

List:

log in to manage your observing lists

 browse:

 

 position:

 

 next:

 

 options:

summary

rename

prune

trim

remove

close

copy

combine

plan

bookmark

load

new

delete

marathon

favourite!

Full database:

Entire DOCdb database of 18,816 objects.

 browse:

 position:

NGC 6249 (14,079 of 18,816)

 next:

oc gc pln bn dn gx gxcl ast aka lost

Object:

list

bookmark

finder chart

altitude today

altitude (year)

 search:

½°, , in DOCdb

show browsing

NGC 6249

NGC 6249, Cl Collinder 319, C 1654-447, Ocl 994, COCD 389, h 3655, GC 4251

RA: 16h 57m 36s
Dec: −44° 49′ 0″

Con: Scorpius
Ch: MSA:1460, U2:407, SA:22

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

(reference key)

Type: open cluster, 22m

Mag: B=8.72, V=8.2

Size: 5′
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 "cluster VIII class, coarse, p rich, stars 9..12th mag." On a second occassion he called it "VII class, p rich, loose irregular figure, large and small stars, 9..15th mag, 10' long, 7' broad."

NGC/IC Dreyer (1888, 1895, 1908)

The NGC records it as "pretty rich, very little compression, irregular outline, stars large and small."

Published comments

Bailey, S.I. (1913)

Bailey, examining a Bruce plate (Harvard Annals, Vol 72, No 2), describes it as "Milky Way, coarse cluster of a dozen pretty bright stars, and many faint stars, diameter 10'."

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 7' and the class as 2 2 p.

It is detached from the surrounding starfield, and is weakly concentrated towards the centre. There is a moderate range of stellar magnitudes present, although there are only about 30 stars in the cluster.

Vogt, N. & Moffat, A.F.J. (1972/3)

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

d = 1.03 kpc, earliest Sp = B3.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 9.5 mag open cluster.

Modern observations

Steve Coe

Steve Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty bright, pretty small, not compressed, 15 stars at 100X.

Contemporary observations

Auke Slotegraaf

1982

A 15.5-inch telescope working at 220 power shows this strange gathering as more like an asterism of 10 stars than an open cluster. It is difficult to see which stars are cluster members and which are field stars. Centering on the cluster's position, one sees four stars forming a False Cross-asterism, to the northwest a tiny parallelogram made up of four stars, and to its northeast 3 stars lying in a curve. Dotted around these are many, much fainter stars.

Magda Streicher

(no date)

16-inch f/10 SCT (127x)

Lovely medium cluster with about 15 stars in a horse shoe shape. The open side is more or less to the east. Show a more prominent part to the north and fainter but more dense part to the SE. Nice grouping more or less 6' in size, which is outstanding against the background star field.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

Named DSOs

Object search

First search phrase

    and

Second search phrase

Type of object to include:

open cluster
globular cluster
planetary nebula
bright nebula
dark nebula
galaxy
galaxy cluster
asterism & stars
unverified/lost
nova

The Bug Report

DOCdb is still in beta-release.

Known issues, feature requests, and updates on bug fixes, are here:

> Bug Report

Feedback

Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!

> Contact us

Help!

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.