NGC 7492
Coordinates: 23h 08m 26.7s, −15° 36′ 39″
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.
- S2CID 195798995
- ^ The globular cluster NGC 7492 and the Sagittarius tidal stream: together but unmixed
- S2CID 59384819
- ^ MASS SEGREGATION AND TIDAL TAILS OF THE GLOBULAR CLUSTER NGC 7492