NGC 7492
| NGC7492 | |
|---|---|
 NGC 7492 withlegacy surveys | |
| Observation data (J2000epoch) | |
| Constellation | Aquarius |
| Right ascension | 23h08m26.7s[1] |
| Declination | −15° 36′ 39″[1] |
| Distance | 24,500kpc(80,000×103ly)[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 7492is aglobular cluster[1]in theconstellationAquarius.It was discovered by the astronomerWilliam Herschelon September 20, 1786.[5]It resides in the outskirts of theMilky 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 outergalactic halo.[6]The cluster is immersed in, but does notkinematicallybelong to, theSagittarius Stream.[7]
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 theMilky Way.[10]
References[edit]
- ^abc"NGC 7492".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2021-09-30.
- ^abUltraviolet 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.Retrieved2021-10-02.
- ^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,S2CID195798995
- ^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,S2CID59384819
- ^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
