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Mag: B=?, V=?
NGC 7143 is a curving line of five stars at JH's position. He suspected that the object might be a nebulous double star, but the Birr Castle observers saw no nebulosity here. Hence, Dreyer has a short note in the NGC saying that the object is probably only a very faint double. On the POSS1 and DSS, however, the asterism is a striking object, and I can easily see why JH picked it up while sweeping. His double star is probably the brighter northeastern pair; Wolfgang's position applies to this pair.
Lord Rosse and his observers did talk about a small cluster in two of their observations, however, and I'm a bit surprised that Dreyer did not include a number in NGC for it.
Sir John Herschel described this object as very faint, possibly a double star, perhaps involved in nebulosity. Dreyer notes that nothing was seen at Birr Castle in 6 observations, and that it is probably only a very faint double star.
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads **,NONEB S.
The Messier objects
The Bennett objects
The Caldwell list
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