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NGC 7492 
Summary
NGC 7492 is a globular cluster[1] in the constellation Aquarius. It was discovered by the astronomer William Herschel on September 20, 1786.[5] It resides in the outskirts of the Milky Way, about 80,000 light-years away, more than twice the distance between the Sun and the center of the galaxy, and is a benchmark member of the outer galactic halo.[6] The cluster is immersed in, but does not kinematically belong to, the Sagittarius Stream.[7]
| NGC 7492 | |
|---|---|
 NGC 7492 with legacy surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Aquarius |
| Right ascension | 23h 08m 26.7s[1] |
| Declination | −15° 36′ 39″[1] |
| Distance | 24,500 kpc (80,000×103 ly)[2] |
| Apparent magnitude (V) | 11.2 |
| Apparent dimensions (V) | 4.2′ |
| Physical characteristics | |
| Absolute magnitude | 0.38±0.04[3] |
| Metallicity | = -1.69[4] dex |
| Estimated age | 12 Gyr[2] |
| Other designations | GCl 125, MWSC 3705 |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
NGC 7492 possess a tidal tail 3.5 degrees long,[8] embedded into an over-density of stars which may be the remnants of a disrupted dwarf galaxy.[9] The shape of the cluster is flattened rather than spherical, likely due to dynamical interaction with the Milky Way.[10]
References edit
- ^ a b c "NGC 7492". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-09-30.
- ^ a b Ultraviolet Imaging Telescope (UVIT) observation of the Galactic Globular Cluster NGC 7492
- ^ Variable stars in the globular cluster NGC 7492, New discoveries and physical parameter determination
- ^ ULTRAVIOLET PROPERTIES OF GALACTIC GLOBULAR CLUSTERS WITH GALEX. II. INTEGRATED COLORS
- ^ Seligman, Courtney. "New General Catalogue objects: NGC 7450 - 7499". cseligman.com. Retrieved 2021-10-02.
- ^ Koch, Andreas; Xu, Siyi; Rich, R. Michael (2019), "Chemical composition of the outer halo globular cluster Palomar 15", Astronomy & Astrophysics, 627: A70, arXiv:1907.02071, Bibcode:2019A&A...627A..70K, doi:10.1051/0004-6361/201935467, S2CID 195798995
- ^ The globular cluster NGC 7492 and the Sagittarius tidal stream: together but unmixed
- ^ Navarrete, C.; Belokurov, V.; Koposov, S. E. (2017), "The Discovery of Tidal Tails around the Globular Cluster NGC 7492 with Pan-STARRS1", The Astrophysical Journal, 841 (2): L23, arXiv:1705.04324, Bibcode:2017ApJ...841L..23N, doi:10.3847/2041-8213/aa72e1, S2CID 59384819
- ^ Sollima, A.; Martínez Delgado, D.; Muñoz, R. R.; Carballo-Bello, J. A.; Valls-Gabaud, D.; Grebel, E. K.; Santana, F. A.; Côté, P.; Djorgovski, S. G. (2018), "A survey for dwarf galaxy remnants around 14 globular clusters in the outer halo", Monthly Notices of the Royal Astronomical Society, 476 (4): 4814–4829, arXiv:1802.09255, doi:10.1093/mnras/sty539
- ^ MASS SEGREGATION AND TIDAL TAILS OF THE GLOBULAR CLUSTER NGC 7492