Globular cluster · Capricornus
M30
Also known as: NGC 7099
mag 7.511′ across
About
M30 is a globular cluster of magnitude 7.5 in Capricornus, about 11′ across.
How to find it
- M30 is in the constellation Capricornus.
- Best evenings: around early October it is highest at about 9 pm (10 pm in summer time); a month earlier, two hours later.
- Where on Earth: it is seen well, at least 10° up, from south of 57° N.
When it rises and sets tonight, how high it climbs and how much the Moon gets in the way are worked out in your browser for your place.
What you will see
- EyesNot visible to the naked eye.
- Binoculars (10×50)A small fuzzy star.
- Telescope (6–8 inch)Resolves into a swarm of stars at medium power, with a dense core.
For a dark country sky with no Moon. From a city, faint galaxies and nebulae can disappear completely.
Facts
| Designations | M30, NGC 7099 |
|---|---|
| Type | Globular cluster |
| Magnitude | 7.5The smaller the number, the brighter. |
| Apparent size | 11′the full Moon is 31′ across |
| Surface brightness | ≈ 21.3 mag/arcsec²Estimate from the magnitude and size, per square arcsecond. |
| Constellation | Capricornus |
| Right ascension (J2000) | 21h 40m 22.0s |
| Declination (J2000) | −23° 10′ 45″ |
More in Capricornus
Sources and credits
Catalog data: OpenNGC by Mattia Verga, CC BY-SA 4.0, and d3-celestial by Olaf Frohn, BSD 3-Clause. All data sources →