NGC 6624
| NGC 6624 | |
|---|---|
 The globular cluster NGC 6624. CreditHubble Space Telescope | |
| Observation data (J2000epoch) | |
| Constellation | Sagittarius |
| Right ascension | 18h23m41s |
| Declination | −30° 21′ 39″ |
| Distance | 25.8 ± 1.1kly(7.91 ± 0.34kpc) |
| Apparent magnitude(V) | 7.6 |
| Apparent dimensions(V) | 8.8arcminutes[1] |
| Physical characteristics | |
| Metallicity | = -0.56 ± 0.27[2]dex |
| Other designations | ESO 457-11, GCl 93,CD−30 15631,CPD−30 5486,HD168943[3] |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
NGC 6624is aglobular clusterin the constellationSagittarius.It was discovered on 24 June 1784 by the astronomerWilliam Herschel.It is given anapparent magnitudeof 7.6 to 8.5.[4] Sixpulsarsare known in NGC 6624. The first of these to be discovered was PSR J1823-3021A. This globular cluster also contains4U 1820-30,alow-mass X-ray binarywith 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 starDelta Sagittarii,[5]and is about 1.17kpc(3.8kly) from theGalactic Center.[2]
References
[edit]- ^ab O'Meara, Steve (2007).Steve O'Meara's Herschel 400 Observing Guide.Cambridge:Cambridge University Press.p. 236.ISBN978-0-521-85893-9.
- ^ab Sofue, Yoshiaki (1998-08-31).The Central Regions of the Galaxy and Galaxies.Netherlands:Kluwer Academic Publishers.p. 37.ISBN978-0-7923-5061-3.
- ^"NGC 6624".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2021-02-19.
- ^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 starDelta Sagittarii. O'Meara, Stephen James (2007).Deep Sky Companions: Hidden Treasures.Cambridge University Press. p. 452.ISBN978-1-139-46373-7.
- ^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.ISBN978-1-4419-1776-8.
- Robert Burnham, Jr,Burnham's Celestial Handbook: An observer's guide to the universe beyond the solar system,vol 3, p. 1557
External links
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