M15
globular cluster · Pegasus · 6.4ᵐ
A globular cluster with an extraordinarily dense core — it probably harbours an intermediate-mass black hole.
Notable facts
About 1/3 the apparent diameter of the Moon.
In brief
Which constellation is M15 in?
M15 lies in Pegasus.
Is M15 visible to the naked eye?
6.4ᵐ — visible with binoculars.
When is the best time to observe M15?
Best observed in August.
Data
- RA / Dec (J2000)
- 21h 30m · +12° 10′
- Type
- globular cluster
- Constellation
- Pegasus
- How to observe
- 6.4ᵐ — visible with binoculars
- Angular size
- 12′
- Designation
- M15 · NGC 7078
Observing tip
In binoculars it is a fuzzy ball; a 100–150 mm telescope starts to resolve individual stars around the edges.
Altitude above the horizon by latitude
| Latitude | Maximum altitude | Rise azimuth |
|---|---|---|
| +60° | 42° | 65° |
| +55° | 47° | 68° |
| +45° | 57° | 73° |
| +30° | 72° | 76° |
| 0° | 78° | 78° |
| −35° | 43° | 75° |
Geometric altitude at upper culmination, atmospheric refraction not included. Positive latitudes are in the northern hemisphere.
Culmination time by month
| Month | Culmination |
|---|---|
| January | 13:44 |
| February | 11:37 |
| March | 09:52 |
| April | 07:59 |
| May | 06:04 |
| June | 03:58 |
| July | 01:54 |
| August | 23:53 |
| September | 22:00 |
| October | 20:11 |
| November | 18:11 |
| December | 16:02 |
Upper culmination in local solar time — no time-zone or daylight-saving correction applied.