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
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	${\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}$ = -1.69[4] dex
Estimated age	12 Gyr[2]
Other designations	GCl 125, MWSC 3705
See also: Globular cluster, List of globular clusters

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

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