NGC 657

NGC 657 is a open cluster located in the constellation Cassiopeia. Some key stats include:

NGC:NGC 657
Type:open cluster
Constellation:Cassiopeia
Right Ascension:01:43:20.80
Declination:55:50:11.00
Major axis:3 '

Right Ascension units = HH:MM:SS.SS
Declination units = DD:MM:SS.SS
PN = planetary nebula