NGC 6891 (also PK 54-12.1) is a magnitude +10.5 planetary nebula located 7200 light years away in the constellation Delphinus. The planetary nebula is a very young nebula and has a diameter of only 0.35 arcmin. The central star HD 192563 is of magnitude +12.5 with a surface temperature is around 85,000 degrees K.
The planetary nebula was discovered by English astronomer Ralph Copeland using a 15-inch Grubb refractor at the Dun Echt observatory, Scotland (or from Arequipa?, Andes) on the 22nd September 1884.
Right ascension 20h 15m 08.8s, Declination +12° 42' 16"
