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 6933 (16,307 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 6933

NGC 6933, GC 5965

RA: 20h 33m 38.18s
Dec: +07° 23′ 14.4″

Con: Delphinus
Ch: MSA:1265, U2:209, SA:16

Ref: Corwin (2004), NGC/IC

(reference key)

Type: star (single)

Mag: B=?, V=?

Size: ?
PA: ?

History and Accurate Positions for the NGC/IC Objects (Corwin 2004)

NGC 6933 is usually taken as the double star centered a few arcsec northeast of Schultz's position. However, it is clear from Schultz's detailed note in his monograph that his object is actually the single southwestern star of the pair. He says of his object that it "... forms an elongated triangle with 2 stars north: star 9.5 mag preceding, star 10 mag following." His position, from 11 settings in RA and 8 in Dec on two different nights, agrees exactly with that measured on the DSS. The identification with the single star is not in doubt.

Why did Schultz think it nebulous, though? His notes on the sky conditions give us clues. On 14 September 1865, his note reads, "Strong gale; images very unsteady," while on 26 August 1867, he has, "Aurora; sky first very fine, soon clouding." However, his description of the nebula itself reads, "Nebula is nearly stellar, its nebulous atmosphere scarcely perceptible; yet it looks quite differently from the surrounding stars, and has a peculiarly flickering light."

By the time Schultz found this object, he was an experienced observer. His description reminds me of several of JH's descriptions of "nebulous atmospheres" around stars, stars which today show no sign at all of any accompanying nebulosity.

Published comments

Sulentic & Tifft (1973)

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

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.