Messier Index/M75
Messier 75 (also known as M75 or NGC 6864) is a w:globular cluster in the w:constellation Sagittarius. It was discovered by w:Pierre Méchain in w:1780 and included in w:Charles Messier's catalog of w:comet-like objects that same year.
| Messier 75 | |
|---|---|
| Observation data (w:J2000 epoch) | |
| Class | I |
| Constellation | Sagittarius |
| Right ascension | 20h 06m 04.75s[1] |
| Declination | -21° 55′ 16.2″[1] |
| Distance | 67.5 kly[citation needed] (20.7 kpc) |
| Apparent magnitude (V) | +9.18[1] |
| Apparent dimensions (V) | 6′.8 |
| Physical characteristics | |
| Mass | kg ( M) |
| Radius | 67 ly[2] |
| Other designations | M75, NGC 6864, GCl 116[1] |
M75 is at a distance of about 67,500 w:light years away from w:Earth and its apparent size on the sky translates to a true radius of some 67 w:light years. It is classified as class I, meaning it is one of the more densely concentrated globular clusters known. The w:absolute magnitude of M75 is about -8.5 or some 180,000 more luminous than the w:Sun.