M102 is one of the most recent additions, or corrections, to the Messier Catalog.
Due to some sloppy book keeping, this was considered a duplicate entry for Messier 101 up until 2017 when Nasa identified that galaxy NGC 5866 was the most likely candidate Messier was trying to identify.
Capture details for Messier 102
Integration: 0.6 hours
Avg. Moon age: 6.48 days
Avg. Moon phase: 40.50%
Astrometry.net job: 3372430
RA center: 15h 5′ 46″
DEC center: +55° 50′ 45″
Pixel scale: 0.718 arcsec/pixel
Orientation: 121.228 degrees
Field radius: 0.354 degrees