NGC 7492
Coordinates: 23h 08m 26.7s, −15° 36′ 39″
NGC 7492 | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Aquarius |
Right ascension | 23h 08m 26.7s[1] |
Declination | −15° 36′ 39″[1] |
Distance | 24,500 kpc (80,000×10 3 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 |
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 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[]
- ^ 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.
- ^ Chemical composition of the outer halo globular cluster Palomar 15, 2019, arXiv:1907.02071
- ^ The globular cluster NGC 7492 and the Sagittarius tidal stream: together but unmixed
- ^ THE DISCOVERY OF TIDAL TAILS AROUND THE GLOBULAR CLUSTER NGC 7492 WITH PAN-STARRS1, 2017, arXiv:1705.04324
- ^ A survey for dwarf galaxy remnants around fourteen globular clusters in the outer halo, 2018, arXiv:1802.09255
- ^ MASS SEGREGATION AND TIDAL TAILS OF THE GLOBULAR CLUSTER NGC 7492
- Globular clusters
- Aquarius (constellation)
- NGC objects