Gliese 163

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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
Mass 0.40 ± 0.02[1] M
Temperature 3500 ± 100[1] K
Metallicity [Fe/H] 0.1 ± 0.1[1] dex
Age 0.77 ± 0.03[1] Gyr
Database references
SIMBAD data

Gliese 163 is an M3.5V red dwarf located 49 light years (15.0pc) from the sun, in the constellation Dorado.[2] 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.[2] Other stellar catalog names for it include HIP 19394 and LHS 188.

Planetary system[edit]

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.[3][4] One planet, Gliese 163 c, with an orbital period of 26 days, was considered potentially in the habitable zone, although hotter than Earth. With a mass estimated as 72 times that of earth, it would be a gas giant. A second planet, Gliese 163 b, with a period of 1 days, would be too hot to be considered habitable. Evidence was also found for a third planet orbiting further out than c and b.[3][4] In June of 2013, it was concluded that at least 3 planets orbit around the star with fourth planet being a possibility. [5]

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 earth masses MJ 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[edit]

  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).

References[edit]

  1. ^ a b c d http://arxiv.org/pdf/1306.1717.pdf
  2. ^ a b Staff (September 20, 2012). "LHS 188 -- High proper-motion Star". Centre de données astronomiques de Strasbourg (Strasbourg astronomical Data Center). Retrieved September 20, 2012. 
  3. ^ a b 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. 
  4. ^ a b Redd, Nola Taylor (September 20, 2012). "Newfound Alien Planet a Top Contender to Host Life". Space.com. Retrieved September 20, 2012. 
  5. ^ http://arxiv.org/abs/1306.1717
  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. ^ http://arxiv.org/abs/1306.0904