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RA: 23h 10m 41.09s
Dec: +14° 23′ 8.9″
Ch: MSA:1233, U2:213, SA:17
Ref: Corwin (2004)
Type: star (single)
Mag: B=?, V=?
NGC 7504 may be a star, as first noted by Reinmuth. It was one of eleven nebulae found by Marth one night late in the summer of 1864 (his date reads "1864.67"), and the only one not clearly a galaxy. The other ten have a systematic offset in their positions estimated by Marth of -1.0 seconds in RA, and +0.6 arcmin in Dec from the modern positions. Applying these to his position for N7504 moves the position a bit closer to the star that Wolfgang and I chose as Marth's possible object. However, it is still further from its modern position than most of Marth's other objects from that same night.
So, I am not at all sure of the identification of N7504 with this star. There are other galaxies in the area that Marth could have seen, but none have positions suggesting digit errors in Marth's position.
The RNGC (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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