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 6830 (15,913 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 6830

NGC 6830, Cl Collinder 406, C 1948+229, Ocl 125, COCD 470, VII 9, h 2052, GC 4516

RA: 19h 51m 0s
Dec: +23° 06′ 0″

Con: Vulpecula
Ch: MSA:1195, U2:162, SA:8

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

(reference key)

Type: open cluster, 22p

Mag: B=8.41, V=7.9

Size: 5′
PA: ?

Historical observations

William Herschel (c.1784)

Synonyms: H VII-009

Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a large cluster of pretty compressed stars most of one size."

Published comments

Roslund, C. (1960)

Roslund, C. (1960) Remarks on Some New and Some Known Galactic Clusters. PASP, 72(426), 205. [1960PASP...72..205R]

"The brightest star is of type A1 II, followed by a B8 II-III star and middle and late B stars on the main sequence."

Raab, S. (1922)

Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.

Discussed, based of F-A plates.

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 10' and the class as 4 2 m.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 9.0 mag open cluster.

Photo index

Photo Index by Jim Lucyk: Vehrenberg's Atlas of DS Splendors (3ed) p207, 213.

Melotte, P.J. (1915)

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

Modern observations

Geldorp, Michael (IAAC)

Observer: Michael Geldorp Your skills: Intermediate (some years) Date/time of observation: 10/13/1999 19.25 UT Location of site: Alphen ad Rijn, Netherlands (Lat 52.09N, Elev ) Site classification: Suburban Sky darkness: 4.5 Limiting magnitude Seeing: III I-V Seeing Scale (I best) Moon presence: None - moon not in sky Instrument: 8" F/6 Dobsonian Magnification: 49X, 98X, 203X, 244X Filter(s): none Object(s): NGC 6830 Category: Open cluster. Class: Constellation: Vul Data: mag 7.9 size 12'.0 Position: RA 19:51 DEC +23:04

Description: Little cluster in a rich starfield. Formed just like a cross in a cross. About a dozen star were resolved in the inner portions. At 203X many stars were seen at the threshold ob visibility. Hard to tell were the cluster ends and the milky way resumes.

There is a sketch on this object on my homepage -- Optional related URLs: http://home.wxs.nl/~geldo006/home.html

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "9M; 8' diameter; fairly tight group of 20-plus 11M and dimmer members; 0.5 degree N of 5M 12 VUL."

Walter Scott Houston

Houston notes that large binoculars are adequate for this cluster. Its brightest stars are magnitude 9, and in all there are perhaps a score brighter than 13, over an area 8' across.

Houston notes that a 10-inch should show this 8th mag cluster as having about 20 stars spread over 12'. He writes: "The cluster is also an interesting binocular object that is surprisingly easy to locate, considering the rather rich Milky Way background."

Brian Skiff

Hoag: brtst * nr center V=9.88/0.28.

8cm - easy @ 20x. sm, diffuse, but hisfcbr. gran to partially res. BS,

15Sep1982, Anderson Mesa.

15cm - 5' diam. brtst * on E, 15 *s like four-legged spider.

- mod f cl only mod-well detached from fld. 6' diam w/35 *s @ 140x. brtr

*s on E and some fntr ones on W form fairly consp X w/arms NE-SW and

NW-SE. brtst * m9.5 is first * SE of `cen *' of X. not well condensed

overall. from N edge of cl NEwd is rel dk area; S&W semicircle is rich

in m12-14 *s. BS, 5Sep1989, Anderson Mesa.

Contemporary observations

Magda Streicher

(no date)

16-inch f/10 SCT (127x)

Field scattered with cluster member in a multitude of magnitude stars. Middle part of the cluster shows of a distinctive cross shape that flares out in the busier northern section of the field. Faint members spray out quite far into the western part of the field. An asterism of brighter stars within the cluster standing out relatively prominent towards the east.

2006 July 18

Pietersburg

16-inch f/10 SCT (95x, 127x)

Conditions: Good

The cluster is medium rich in similar magnitude stars, and stand out in a nice way against the background star field. With care the stars form a letter X with the NW-SE bar the more outstanding. Star strings point out into the other direction NE-SW as well. I would say that the SW string is the more sparce bar. Two 9 and 9.5 Magnitude stars is situated just outside the SE cluster edge. The NE part is consist of the more fainter stars. Field scattered with cluster member in a multitude of magnitude stars. Middle part of the cluster shows of a distinctive cross shape that flares out in the busier northern section of the field. An asterism of a few stars within the cluster standing out relatively prominent towards the east.

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.