Gliese 163

Gliese 163 is an M3.5V red dwarf located 49 light years (15.0pc) from the sun, in the constellation Dorado.[3] Its coordinates in the night sky are RA 04h 9m 16s and Dec. -53°22'. It has a visual magnitude of 11.8 and an absolute magnitude of 10.9.[3] Other stellar catalog names for it include HIP 19394 and LHS 188.

Gliese 163
Observation data
Epoch J2000      Equinox J2000
Constellation Dorado
Right ascension  04h 09m 15.663s
Declination −53° 22′ 25.31″
Apparent magnitude (V) 11.8
Characteristics
Spectral type M3.5V
Astrometry
Absolute magnitude (MV)10.9
Other designations
GJ 163, HIP 19394, LHS 188.
Details
Mass0.40 ± 0.02[1] M☉
Temperature3500 ± 100[1] K
Metallicity [Fe/H]0.1 ± 0.1[1] dex
Rotation61.0±0.3 d[2]
Age0.77 ± 0.03[1] Gyr
Database references
SIMBADdata

Planetary system
Artist concept of a red dwarf surrounded by three planets.

In September 2012, astronomers using the HARPS instrument announced the discovery of two planets orbiting Gliese 163.[4][5] One planet, Gliese 163 c, with an orbital period of 26 days, and a minimum mass of 7.2 Earth masses, was considered potentially in the habitable zone, although hotter than Earth. A second planet, Gliese 163 b, was also announced, with a period of 1 day. It would be too hot to be considered habitable. Evidence was also found for a third planet orbiting further out than c and b.[4][5] In June 2013, it was concluded that at least 3 planets orbit around the star with fourth planet being a possibility.[1]

The Gliese 163 planetary system[6][7][8][9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.0334 ± 0.0019 MJ 0.06069 ± 0.0001 8.633 ± 0.00155 0.0106 ± 0.05 — —
e 0.012 MJ 0.10 19.46 ± 0.02 0.32 ± 0.17 — —
c 6.8 M⊕ 0.1254 ± 0.0001 25.645 ± 0.0235 0.094 ± 86[~ 1] — —
f 0.023 MJ 0.33 108.4 ± 0.5 0.41 ± 0.15 — —
d 0.06945 ± 0.0092 MJ 1.02689 ± 0.0086 600.895 ± 7.56 0.399 ± 0.077 — —

Notes
  1. So at http://exoplanet.eu/, but eccentricity of an elliptic orbit cannot be equal or exceed 1. (Maybe 0.094 ± 0.086 ?) (At Bonfils et al. (2013), Table 2: 0.099 ± 0.086).
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References
  1. Tuomi, M.; Anglada-Escudé, G. (2013). "Up to four planets around the M dwarf GJ 163". Astronomy & Astrophysics. 556: A111. arXiv:1306.1717. doi:10.1051/0004-6361/201321174.
  2. Suárez Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society, 452 (3): 2745–2756, arXiv:1506.08039, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441.
  3. Staff (September 20, 2012). "LHS 188 -- High proper-motion Star". Centre de données astronomiques de Strasbourg (Strasbourg astronomical Data Center). Retrieved September 20, 2012.
  4. Méndez, Abel (August 29, 2012). "A Hot Potential Habitable Exoplanet around Gliese 163". University of Puerto Rico at Arecibo (Planetary Habitability Laboratory). Retrieved September 20, 2012.
  5. Redd, Nola Taylor (September 20, 2012). "Newfound Alien Planet a Top Contender to Host Life". Space.com. Retrieved September 20, 2012.
  6. "Planet Gj 163 b". Extrasolar Planets Encyclopaedia. Retrieved 2013-06-15.
  7. "Planet Gj 163 c". Extrasolar Planets Encyclopaedia. Retrieved 2013-06-15.
  8. "Planet Gj 163 d". Extrasolar Planets Encyclopaedia. Retrieved 2013-06-15.
  9. Bonfils, X.; Lo Curto, G.; Correia, A. C. M.; Laskar, J.; Udry, S.; Delfosse, X.; Forveille, T.; Astudillo-Defru, N.; Benz, W.; Bouchy, F.; Gillon, M.; Hébrard, G.; Lovis, C.; Mayor, M.; Moutou, C.; Naef, D.; Neves, V.; Pepe, F.; Perrier, C.; Queloz, D.; Santos, N. C.; Ségransan, D. (5 August 2013). "The HARPS search for southern extra-solar planets". Astronomy & Astrophysics. 556: A110. arXiv:1306.0904. Bibcode:2013A&A...556A.110B. doi:10.1051/0004-6361/201220237.
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