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Type: stars (two)
Mag: B=?, V=?
NGC 7804 is a double star. Dreyer, in a note in NGC itself, says that "von Engelhardt in 4 obs could only see a D* without nebulosity." Once Burnham turned the 36-inch at Lick on the object, the question was settled for Dreyer. His IC1 note is quite firm: "To be struck out, only a F double star without nebulosity (Burnham)." This is indeed what we see today.
The discoverer of this object, Schweizer, is not otherwise known to me. Perhaps someone can do some biographical digging. He was probably an observer at Moscow as the observation comes originally, according to the NGC note, from the "Obs. de Moscou," Vol II, book 2, pp 115 and 119.
Schweizer's description of this object reads: "very faint, double star, nebulous?" Dreyer notes that this entry should be struck out, as Burnham observed only a faint double star, without nebulosity.
Publ.Lick.Obs. Volume 2. "Observations of Nebulae with the 36-inch Refractor of the Lick Observatory", p 168.
I examined this region very carefully on two nights. The faint pair mentioned was found; but there was no trace of nebulosity about it, or anywhere in the vicinity. I measured the double star as follows 55.6deg, 9.79''. 12.5 & 13.0. .... [comparing positions] showed that it was certainly the object taken for a nebula by Schweizer and observed by Bredechin..."
(Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads ** DC.
The Messier objects
The Bennett objects
The Caldwell list
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