GJ 625

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AC 54 1646-56
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension  16h 25m 24.6233s[1]
Declination 54° 18′ 14.7658″[1]
Apparent magnitude (V) 10.17
Spectral type M2.0V
Proper motion (μ) RA: 432.073±0.064[1] mas/yr
Dec.: −171.668±0.059[1] mas/yr
Parallax (π)154.4710 ± 0.0273[1] mas
Distance21.114 ± 0.004 ly
(6.474 ± 0.001 pc)
Other designations
GJ 625, HIP 80459, AC +54 1646, G 202-48, G 226-7, G 225-62, LSPM J1625+5418, NLTT 42804, PLX 3740.03, TYC 3878-1193-1, 2MASS J16252459+5418148
Database references

GJ 625 (AC 54 1646-56) is a red dwarf star of spectral type M2.0V, located in the constellation Draco, 21.1 light-years from Earth.[1]

Planetary system[edit]

On May 18, 2017, a planet was detected orbiting AC 54 1646-56 by the HARPS-N telescope.[2] The planet, AC 54 1646-56b (GJ 625b), orbits on the inner edge of the circumstellar habitable zone of its star, and may support liquid water.

The GJ 625 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 2.82±0.51 M 0.078 14.628±0.013


  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Suárez Mascareño, A.; et al. (2017). "HADES RV Programme with HARPS-N at TNG. V. A super-Earth on the inner edge of the habitable zone of the nearby M dwarf GJ 625". Astronomy and Astrophysics. 605. A92. arXiv:1705.06537. Bibcode:2017A&A...605A..92S. doi:10.1051/0004-6361/201730957.