NGC 6624 explained

NGC 6624
Epoch:	J2000
Dist Ly:	25.8+/-
Appmag V:	7.6
Size V:	8.8 arcminutes^[1]
Constellation:	Sagittarius
Metal Fe:	-0.56 ± 0.27
Names:	^[2]

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.^[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 1.17abbr=onNaNabbr=on from the Galactic Center.^[5]

References

• Robert Burnham, Jr, Burnham's Celestial Handbook: An observer's guide to the universe beyond the solar system, vol 3, p. 1557

External links

• • NGC 6624

Notes and References

1. Book: O'Meara , Steve . Steve O'Meara's Herschel 400 Observing Guide . . 2007 . Cambridge . 236 . 978-0-521-85893-9.
2. NGC 6624. 2021-02-19.
3. 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.

   Book: O'Meara , Stephen James . Deep Sky Companions: Hidden Treasures . Cambridge University Press . 2007 . 452 . 978-1-139-46373-7.

4. Book: Bakich , Michael E. . 1001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers . Springer . Patrick Moore's Practical Astronomy Series . 2010 . 249 . 10.1007/978-1-4419-1777-5 . 978-1-4419-1776-8.
5. Book: Sofue , Yoshiaki . The Central Regions of the Galaxy and Galaxies . . 1998-08-31 . Netherlands . 37 . 978-0-7923-5061-3.