Gliese 180

Source: Wikipedia, the free encyclopedia.
Gliese 180
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 04h 53m 49.97992s[1]
Declination −17° 46′ 24.3093″[1]
Apparent magnitude (V) 10.894[2]
Characteristics
Spectral type M2V[3] or M3V[4]
U−B color index 1.155[2]
B−V color index 1.549[2]
V−R color index 1.018[2]
R−I color index 1.205[2]
J−H color index 0.553[2]
J−K color index 0.815[2]
Distance
38.972 ± 0.007 ly
(11.949 ± 0.002 pc)
Absolute magnitude (MV)10.48[2]
Details
Gyr
TYC 5903-680-1, 2MASS J04534995-1746235,[8]
[RHG95] 838
Database references
Exoplanet Archive
data
ARICNSdata

Gliese 180 (often shortened to GJ 180), is a small

arcseconds per year.[10]

The

rotation period of about 65 days.[6] The star has 43% of the Sun's mass and 42% of the radius of the Sun. It is radiating just 2.4%[3] of the luminosity of the Sun from its photosphere at an effective temperature of 3,634 K.[5]

Planetary system

Gliese 180 is known to have at least two

mean motion resonance that is stabilizing the orbits. The habitable zone of this star, by the criteria of Kopparapu and associates (2013), ranges from 0.12 AU out to 0.24 AU, which thus includes planet 'c'.[13]

According to the Planetary Habitability Laboratory (PHL) in Puerto Rico, both

c worlds in the system may be classifiable as potentially habitable planets. Planets Gliese 180 b and Gliese 180 c have minimum masses of 6.4 and 8.3 Earth masses, respectively.[14]
However, Dr Mikko Tuomi, of the UK's University of Hertfordshire, whose team identified the planets, disagreed, stating:

"The PHL adds some sort of an “extended HZ”, which I, frankly, do not know how it’s calculated, but that adds some areas of potential habitability to the inner and outer edges of the HZ as we have defined it. They included the inner companion of the GJ 180 system (planet b) that we consider too hot to be potentially habitable.”[14]

However, as of 2022, the PHL lists only planets c and d, not b, as potentially habitable.[15]

The Gliese 180 planetary system[13][12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b
 		≥6.49±0.68 M🜨 0.092±0.003 17.133±0.003 0.07±0.04 — —
с
 (unconfirmed) 		≥6.4+3.7
−4.1 M🜨 		0.129+0.007
−0.017 		24.329+0.052
−0.066 		0.09+0.20
−0.09 		— —
d
 		≥7.56±1.07 M🜨 0.309±0.010 106.300±0.129 0.14±0.04 — —

See also

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    doi:10.1111/j.1365-2966.2009.16182.x
    .
  3. ^
    S2CID 102351979
    . A68.
  4. ^
    doi:10.1086/114146
    .
  5. ^
    doi:10.1051/0004-6361/202038787
    , A22.
  6. ^
    S2CID 119237202
    , A13
  7. ^
    S2CID 119385780
    .
  8. ^ "L 736-30". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-15.
  9. S2CID 119257644
    .
  10. Bibcode:1979lccs.book.....L
    .
  11. S2CID 118425326
    , 93.
  12. ^
    S2CID 210064560
    .
  13. ^
    S2CID 32965505
    .
  14. ^ a b Sutherland, Paul (March 5, 2014). "Habitable planets common around red dwarf stars". Sen. Sen Corporation Ltd.
  15. ^ "The Habitable Exoplanets Catalog". Planetary Habitability Laboratory. University of Puerto Rico at Arecibo. Retrieved 4 December 2022.
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