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Identity uncertain; probably the Spindle Galaxy

Proper NamesMay correspond to the Spindle Galaxy, or possibly the Pinwheel Galaxy
Messier NumberM102 (may be a duplicate of M101)
NGC/IC NumberProbably NGC 5866, but possibly NGC 5457, or one of several other candidates
ConstellationProbably either Draco or Ursa Major
Right Ascension15h 6m 30s
Declination+55° 45' 48"
Distancec.39,200,000 light years
c.12,000,000 parsecs
MagnitudeApparent: +10.8
Absolute: -19.6
DiameterApparent: 6.5'
Actual: c.74,000 light years
Hubble TypeS0 Spiral Galaxy (probably Lenticular)
Optimum VisibilityMay (Usually visible from northern latitudes)
NotesThe galaxy intended by Messier as number 102 in his Catalogue has not been identified with certainty. Perhaps its most likely identity is the Spindle Galaxy, NGC 5866, and where specific values are given above, they refer to that galaxy. It has also been proposed that M102 might simply be a duplicate of M101, the Pinwheel Galaxy, and a number of other candidate galaxies have also been put forward.