NGC 646
NGC 646 is a galaxy pair located in the constellation Hydrus. Some key stats include:
| NGC: | NGC 646 |
| Type: | galaxy pair |
| Constellation: | Hydrus |
| B-magnitude (blue): | 14.3 |
| Right Ascension: | 01:37:25.50 |
| Declination: | -64:53:47.00 |
| Major axis: | 1.51 ' |
| Minor axis: | 1.02 ' |
| Angle (major axis): | 121° |
Right Ascension units = HH:MM:SS.SS
Declination units = DD:MM:SS.SS
PN = planetary nebula