|Right Ascension|| 11 : 56.5 (h:m)
|Declination|| +55 : 08 (deg:m)
|Distance|| 60000 (kly)
|Visual brightness|| 11.8 (mag)
|Apparent dimension||2.3x2.0 (arc min)|
NGC 3982 was discovered by William Herschel on April 14, 1789, and mis-classified as planetary nebula, as can be seen from his catalog entry in his fourth object group and his numbering H IV.62.
It is a member of the Ursa Major Cloud or Cluster of Galaxies, which also contains M 109.
NGC 3982 is receding from us at 1109 km/sec, which corresponds to a recession velocity of 1187 km/sec from the center of our Milky Way.
Our image was obtained by Norbert Stapper on April 22, 1998, 21:38 UT, with a Celestron 8 (f=2m), LPR-Filter, and ST-7 high Res. CCD camera, 3 exposures of 5 minutes each and one of 15 minutes exposure time. At this time, the supernova had a brightness of about 12.5-12.7 magnitudes. In addition to the SN, the spiral arms of NGC 3982 are clearly visible in this image.
Hartmut Frommert [contact]