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Deep Sky Observer's Companion – the online database

 

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NGC 6644 (15,193 of 18,816)

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NGC 6644

NGC 6644, ESO 522-33, HD 170839, Hen 2-408, PK 008-07 2, PN G008.3-07.3, PN VV' 417, PN VV 188, PN Sa 2-343, Wray 16-415

RA: 18h 32m 34.64s
Dec: −25° 07′ 44″

Con: Sagittarius
Ch: MSA:1391, U2:340, SA:22

Ref: SIMBAD

(reference key)

Type: planetary nebula

Mag: B=?, V=9.6

Size: ?
PA: ?

Historical observations

NGC/IC Dreyer (1888, 1895, 1908)

This 12th magnitude planetary nebula was discovered by Pickering, who described it as "stellar".

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag planetary nebula.

Modern observations

Steve Coe

Steve Coe, observing with a 13" f/5.6, notes: "Pretty bright, very small, round, bright middle with a stellar nucleus of about 13th mag at 285X. This planetary is about three time the size of the Airy disk."

Contemporary observations

Auke Slotegraaf

1985

With a 15.5-inch telescope, the nebula forms a right-angled triangle with two bright stars lying to its east. It appears moderately bright, but is considerably fainter than the two stars of the triangle. It is difficult to determine wether this object really is the planetary, because very close to it lies another star-like object, which is still fainter. Under moderate skies both objects show a disc and it is hard to discriminate between the two.

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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.