NGC 6624
| NGC 6624 | |
|---|---|
| 300px
The globular cluster NGC 6624. Credit Hubble Space Telescope
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| Observation data (J2000 epoch) | |
| Constellation | Sagittarius |
| Right ascension | 18h 23m 41s |
| Declination | −30° 21′ 39″ |
| Distance | 25.8 ± 1.1 kly (7.91 ± 0.34 kpc) |
| Apparent magnitude (V) | 7.6 |
| Apparent dimensions (V) | 8.8 arcminutes[1] |
| Physical characteristics | |
| Metallicity | -0.56 ± 0.27[2] dex |
NGC 6624 is a globular cluster in the constellation Sagittarius. It was discovered on 24 June 1784 by the astronomer William Herschel. It has an apparent magnitude of 7.6.[3] Six pulsars are known in NGC 6624. The first of these to be discovered was PSR J1823-3021A. This globular cluster also contains 4U 1820-30, a low-mass X-ray binary with an orbital period of only 11.5 minutes.
NGC 6624 is visible as a hazy spot with a small telescope, and appears as a star-like object with binoculars. Its core appears significantly condensed.[1] It is located 0.8 degrees southeast of the star Delta Sagittarii,[4] and is about 1.17 kpc (3.8 kly) from the Galactic center.[2]
References
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