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Mag: B=?, V=?
NGC 7210 is lost. There are notes about it in GC and NGC. Dreyer has a note in LdR's 1880 monograph that the object is the only nebula found by JH in Sweep 103 (I scanned JH's 1833 list between 14 hours and 8 hours, and found no others). In addition, JH marked both RA and Dec with double colons; he apparently had reason to doubt the position. Finally, his north polar distance is one degree less in the 1833 list than it is in GC (Dreyer adopts the GC position for NGC) -- this was apparently not noticed by anyone who tried to find N7210. Unfortunately, there is nothing matching JH's description at either position.
For the record, that description reads, "eF, R, bM, ill-defined; a vF double star 45 deg np 4 arcmin dist points just to it." I scanned the POSS1 prints for several degrees around JH's nominal position, but found no galaxy in the area with a faint double where JH placed it.
So, even with two positions and a striking description, the object remains at large.
Recorded by Sir John Herschel as extremely faint, round, brighter towards the middle with a very faint double star North-West.
An observer using the 72-inch f/8.8 speculum telescope at Birr Castle searched in vain for the object on three occasions.
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NF DC.
The Messier objects
The Bennett objects
The Caldwell list
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