Gliese 180

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Star
Gliese 180
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Eridanus
Right ascension 04 h 53 m 49.98 s
declination -17 ° 46 ′ 24.3 ″
Apparent brightness 10,894 mag
Typing
Known exoplanets 2
B − V color index (1,549) 
U − B color index (1,155) 
R − I index (1,205) 
Spectral class M2 V
Astrometry
Radial velocity −14.55 ± 0.24 km / s
parallax 83.70 ± 0.30  mas
distance 39  ly
12  pc
Proper movement 
Rec. Share: (408.5)  mas / a
Dec. portion: (−644.5)  mas / a
Physical Properties
Dimensions 0.43  M ☉
Luminosity

0.013  L ☉

Effective temperature 3,371  K
Other names
and catalog entries
Gliese catalog FY 180 [1]
Hipparcos catalog HIP 22762 [2]
Tycho catalog TYC 5903-680-1 [3]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J04534995-1746235 [4]
Other names LHS 1712

Gliese 180 (also GJ 180 ) is a red dwarf in the constellation Eridanus , which is around 39 light years from the sun . The star presumably has a planetary system with two known exoplanets . Like all red dwarfs, Gliese 180 is significantly poorer in mass and less luminous than the sun. Its mass is 43% of the solar mass , its luminosity 1.3% of the solar luminosity .

Planetary system

Based on measured data of the Échelle spectrograph HARPS and UVES the ESO , an international team of astronomers published under the direction of Mikko Tuomi from the University of Hertfordshire at the beginning of March 2014, the discovery of eight Exoplanetenkandidaten six sun near red dwarfs, including Gliese 180th

Both possible planets are super-earths with a minimum mass of 6.4 or 8.3 Earth masses , which orbit their central star in a little more than 17 or 24 days. According to the exploration team, at least the outer planet, Gliese 180 c , is in the star's habitable zone . According to the Planetary Hability Laboratory ( PHL ) of the University of Puerto Rico at Arecibo , the inner planet Gliese 180 b could also orbit in the habitable zone of Gliese 180. Since only the minimum mass of the planet candidates is known, it cannot be said whether Gliese 180 b and c are actually rock planets or small gas planets .

Gliese planetary system 180
Planet
(by distance from the star) 		Discovery
(year) 		Mass
(in M ♁ ) 		Cycle time
(in days) 		Major semi-axis
(in AU ) 		eccentricity
Gliese 180 b 2014 6.4 17.38 0.103 0.11
Gliese 180 c 2014 8.3 24,329 0.129 0.09

Individual evidence

  1. ↑ a b c d e f g SIMBAD: GJ 180. Accessed July 7, 2018 .
  2. ↑ a b c d e f g h i Tuomi, M .; Jones, HRA; Barnes, JR; Anglada-Escude, G .; Jenkins, JS: Bayesian search for low-mass planets around nearby M dwarfs. Estimates for occurrence rate based on global detectability statistics . arxiv : 1403.0430 .
  3. ^ A b University of Puerto Rico at Arecibo: Stars with Multiple Habitable Planets Might be Common. Retrieved July 29, 2015 .
  4. ↑ Sen.com, March 5, 2014: Habitable planets common around red dwarf stars. Retrieved July 29, 2015 .
  5. ^ The Extrasolar Planets Encyclopaedia: Planet GJ 180 b. Retrieved July 29, 2015 .
  6. ^ The Extrasolar Planets Encyclopaedia: Planet GJ 180 c. Retrieved July 29, 2015 .