M30
globular cluster · Capricornus · 7.5ᵐ
A Messier catalogue object — globular cluster in Capricornus.
Notable facts
About 1/3 the apparent diameter of the Moon.
In brief
Which constellation is M30 in?
M30 lies in Capricornus.
Is M30 visible to the naked eye?
7.5ᵐ — visible with binoculars.
When is the best time to observe M30?
Best observed in August.
Data
- RA / Dec (J2000)
- 21h 40m · −23° 11′
- Type
- globular cluster
- Constellation
- Capricornus
- How to observe
- 7.5ᵐ — visible with binoculars
- Angular size
- 11′
- Designation
- M30 · NGC 7099
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° | 7° | 142° |
| +55° | 12° | 133° |
| +45° | 22° | 124° |
| +30° | 37° | 117° |
| 0° | 67° | 113° |
| −35° | 78° | 119° |
Geometric altitude at upper culmination, atmospheric refraction not included. Positive latitudes are in the northern hemisphere.
Culmination time by month
| Month | Culmination |
|---|---|
| January | 13:55 |
| February | 11:48 |
| March | 10:02 |
| April | 08:09 |
| May | 06:15 |
| June | 04:08 |
| July | 02:05 |
| August | 00:04 |
| September | 22:10 |
| October | 20:22 |
| November | 18:21 |
| December | 16:12 |
Upper culmination in local solar time — no time-zone or daylight-saving correction applied.