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 6569 (15,018 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 6569

NGC 6569, Dunlop 619, Cl VDBH 260, ESO 456-77, GCl 91, C 1810-318, Bennett 106, II 201, h 3736, GC 4389

RA: 18h 13m 38.88s
Dec: −31° 49′ 35.2″

Con: Sagittarius
Ch: MSA:1414, U2:377, SA:22

Ref: SIMBAD, SEDS

(reference key)

Type: globular cluster

Mag: B=10.78, V=9.47

Size: 6.4′
PA: ?

Historical observations

William Herschel (c.1784)

Synonyms: H II-201

Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "F, pL, lbM, r."

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 "globular, pB, L, R, glbM, 4' diam, resolved into stars 15m." On a second occassion he called it "globular, vB, L, R, gbM, 3' diam, resolved. In milky way." His third observation was recorded as "globular, pB, R, vglbM, 3.5' diam, resolved." On July 16, 1836 he noted: "Found in equatorial [5-inch refractor] in a zone review for double stars, where it appeared as a F R neb 1' diam."

Published comments

Hinks, A.R. (1911)

Hinks, A. R. (1911) On the galactic distribution of gaseous nebulae and of star clusters. MNRAS, 71(8), 693-701.

List 6: "NGC numbers of clusters classed as globular, not in Bailey's catalogue"

Bailey, S.I. A catalogue of bright clusters and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.

Helwan Obs. Bulletin No 21 (1920)

Globular cluster 1.5' diameter. Near edge of plate.

Helwan Obs. Bulletin No 22 (1921)

2'x2', globular cluster, rather sparse in centre.

Shapley, H. (1930) "Star Clusters" Harvard Obs. Monographs No. 2

p 22: There are a few individual globular clusters, NGC 4372, NGC 6144 and NGC 6569 that are in or near recognized dark or luminous nebulae. … NGC 6569 is in a rich star field in Sagittarius but may also be involved in wisps of obscuring nebulosity."

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 10.5 mag globular cluster.

Melotte, P.J. (1915)

A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.

Harris, W.E. (1997)

RA 18 13 38.9 (2000) Dec -31 49 35 Integrated V magnitude 8.55 Central surface brightness, V magnitudes per square arcsecond 18.08 Integrated spectral type G1: Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 1.27 Core radius in arcmin .37. ["Catalog Of Parameters For Milky Way Globular Clusters", compiled by William E. Harris, McMaster University. (Revised: May 15, 1997; from http://www.physics.mcmaster.ca/Globular.html; Harris, W.E. 1996, AJ, 112, 1487) ]

Modern observations

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10M; 2' diameter; unresolved, bright, round glow with little center brightness; double star B-1353 nearby; 6.5M star 10' due S is hopeless DBL ST B-1353 (0.1" separation; both 7M)."

Steve Coe

Steve Coe, observing with a 13" f/5.6, notes: "Bright, large, round, resolved 12 stars with a very grainy backround at 165X."

Contemporary observations

Auke Slotegraaf

1993 April 30

30/04/93: Observing with a 6-inch f/8.6 Newtonian, this cluster appears as a faint, nebulous extended haze, not small, can be seen at 52x. There is a 7th mag star South.

Magda Streicher

1997 August 05

12-inch Meade, 40mm eyepiece, 53' fov. 1997-08-05, fair sky conditions "A hazy small faint globular cluster difficult to determine. Uneven disk situated in a beautiful medium starfield." [Magda Streicher, Pietersburg 23-53S, 29-28E]

(no date)

12-inch f/10 SCT (EP: 2-inch 40mm SW 76x 53' fov; 2-inch 14mm UW 218x 23' fov; 2-inch 8.8mm UW 346x 15' fov)

A hazy, small, globular cluster difficult to determine. Slightly getting brighter to a wide core, but could not resolve its stars. The edges however show again a slightly sandy and ruff texture. Lovely white 7th magnitude star 8' arc minutes straight south in the field of view (76x). William Herschel discovered this globular in 1784 with an 18 speculum.

Tom Bryant

2008-07-03 00:00:00

Observing site: Pinnacles overlook

Telescope: C-8

[18h 13m 36s, -31 50' 0"] A compact cluster whose stars made resolution difficult.

Richard Ford

2012 September, 15th

Location:Night Sky Caravan Park,Bonnievale.

Sky Conditions:Whole Milky Way is visible.The sky is clean.

Atmosphere stable with little interference.

Instrument:12-inch Dobsonian.

This globular cluster looks like a soft snowball that is vaguely out of focus and that the stars in this cluster is unresolved and no resolution is seen in this globular cluster.The nucleus of this cluster is very condensed in the center.This globular cluster measures 4.3'*4.3'.Chart:No.322,NSOG Vol.2.

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.