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NGC 6933 (16,307 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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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.

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