NGC 6624 information

NGC 6624
NGC 6624
	The globular cluster NGC 6624. Credit Hubble Space Telescope
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
Physical characteristics
Metallicity	= -0.56 ± 0.27 dex
Other designations	ESO 457-11, GCl 93, CD−30 15631, CPD−30 5486, HD 168943
	See also: Globular cluster, List of globular clusters

NGC 6624 is a globular cluster in the constellation Sagittarius. It was discovered on 24 June 1784 by the astronomer William Herschel. It is given an apparent magnitude of 7.6 to 8.5.^[4] 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,^[5] and is about 1.17 kpc (3.8 kly) from the Galactic Center.^[2]

^ ^a ^b O'Meara, Steve (2007). Steve O'Meara's Herschel 400 Observing Guide. Cambridge: Cambridge University Press. p. 236. ISBN 978-0-521-85893-9.
^ ^a ^b Sofue, Yoshiaki (1998-08-31). The Central Regions of the Galaxy and Galaxies. Netherlands: Kluwer Academic Publishers. p. 37. ISBN 978-0-7923-5061-3.
^ "NGC 6624". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-19.
^ It is given a diameter of 6 to 8.5 arcminutes, and class VI with stars magnitude 14 and dimmer. It is less than a degree southeast of star Delta Sagittarii. O'Meara, Stephen James (2007). Deep Sky Companions: Hidden Treasures. Cambridge University Press. p. 452. ISBN 978-1-139-46373-7.
^ Bakich, Michael E. (2010). 1001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers. Patrick Moore's Practical Astronomy Series. Springer. p. 249. doi:10.1007/978-1-4419-1777-5. ISBN 978-1-4419-1776-8.

[O'Meara-1] O'Meara, Steve (2007). Steve O'Meara's Herschel 400 Observing Guide. Cambridge: Cambridge University Press. p. 236. ISBN 978-0-521-85893-9.

[Sofue-2] Sofue, Yoshiaki (1998-08-31). The Central Regions of the Galaxy and Galaxies. Netherlands: Kluwer Academic Publishers. p. 37. ISBN 978-0-7923-5061-3.

[3] "NGC 6624". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-19.

[O'Meara2-4] It is given a diameter of 6 to 8.5 arcminutes, and class VI with stars magnitude 14 and dimmer. It is less than a degree southeast of star Delta Sagittarii. O'Meara, Stephen James (2007). Deep Sky Companions: Hidden Treasures. Cambridge University Press. p. 452. ISBN 978-1-139-46373-7.

[Bakich-5] Bakich, Michael E. (2010). 1001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers. Patrick Moore's Practical Astronomy Series. Springer. p. 249. doi:10.1007/978-1-4419-1777-5. ISBN 978-1-4419-1776-8.

NGC 6624 information

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