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 6568 (15,011 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


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 6568

NGC 6568, Cl Collinder 369, C 1809-216, Ocl 28.0, COCD 434, VII 30, h 1998, h 3735, GC 4388

RA: 18h 12m 42s
Dec: −21° 36′ 0″

Con: Sagittarius
Ch: MSA:1392, U2:339, SA:22

Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 41m

Mag: B=?, V=8.6

Size: 12′
PA: ?

Historical observations

William Herschel (c.1784)

Synonyms: H VII-030

Discovered in 1786 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of pS scattered stars, above 15' diameter."

John Herschel (1847) Cape Observations

Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "cluster VIII, loose, scattered, fills field, is decidedly richer than any part of the milky way that has occurded to-night."

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 15' and the class as 3 1 m.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 8.5 mag open cluster.

Doig, P. (1925)

Journal BAA, 36, Nov, p58

L coarse cluster of irr.form.

Modern observations

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "8.5M; 13' diameter; 50-plus members; large, scattered group 35' SSW of 4M Mu SGR; 10' to the ESE is 5.5M 14 SGR and TL-3, the "HSL Chain"."

Steve Coe

Steve Coe, observing with a 13" f/5.6, notes: "Pretty bright, large, pretty rich, somewhat compressed, 33 stars within 10 arcmin at 100X, a nice globular of pretty faint stars."

Contemporary observations

Auke Slotegraaf

1998 July 31

Location: Jonkershoek Nature Reserve, Assegaaibosch Station

Date: 1998 July 31 / August 01, 01:00-02:40 SAST

11x80 tripod-mounted binoculars (9.5 mag stars at times not easy)

Sky conditions: Mediocre (transp. low, seeing average, dew) The skies are showing the effects of the combination of pollution (mainly from a nearby wood-processing plant) and a stable inversion layer, turning daytime skies grey-blue, and night skies ashen.

With 9.5 mag stars at times difficult, this cluster wasn't noticed while sweeping. Determined its position with care, and it still did not yield.

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.