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RA: 12h 56m 29.8s
Dec: +27° 56′ 23″
Con: Coma Berenices
Ch: MSA:653, U2:149, SA:7
Type: galaxy, C
Mag: B=15.7, V=14.7
Size: 0.5′ x 0.5′
NGC 4817. The NGC position, and that in the Comptes Rendus list, are wrong; while the offsets in Bigourdan's big table, and the position reduced from them, are correct. I have not found a correction in any of Bigourdan's errata lists, so I assume that he did not catch the error, or chose to not mention it.
In any case, the reduced position falls exactly on a faint galaxy. Bigourdan's note about the star northeast is correct, so the identification is not in doubt.
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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