Pi Mensae

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Stern
π Mensae
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Table Mountain
Right ascension 05 h 37 m 9.89 s
declination -80 ° 28 ′ 8.8 ″
Apparent brightness 5.67 likes
Typing
Known exoplanets 2
B − V color index +0.60 
U − B color index +0.11 
R − I index +0.19 
Spectral class G0 V
Astrometry
Radial velocity (+10.73 ± 0.15) km / s
parallax (54.71 ± 0.07)  mas
distance (59.59 ± 0.08)  Lj
(18.27 ± 0.02)  pc  
Proper movement 
Rec. Share: (+311.19 ± 0.13)  mas / a
Dec. portion: (+1048.85 ± 0.14)  mas / a
Physical Properties
Dimensions 1.1  M ☉
radius 1.1  R ☉
Luminosity

1.4  L ☉

Effective temperature (6037 ± 45)  K.
Metallicity [Fe / H] +0.08 ± 0.03
Age 3.0 +1.4−1.3Bill.  A
Other names
and catalog entries
Bayer name π canteens
Cordoba Survey CD −80 ° 195
Bright Star Catalog HR 2022 [1]
Henry Draper Catalog HD 39091 [2]
Gliese catalog FY 9189 [3]
Hipparcos catalog HIP 26394 [4]
SAO catalog SAO 258421 [5]
Tycho catalog TYC 9386-2614-1 [6]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J05370988-8028090 [7]
Other names LHS 208 • PPM 376576

π Mensae ( Pi Mensae , π Men ), also known as HD 39091 , is a star about 60 light-years away with an apparent magnitude of 5.7 mag.

Substellar companions

The star is orbited by a substellar object with the systematic name Pi Mensae b or HD 39091 b , which could be an exoplanet. It was discovered using the radial velocity method ( Butler  et al., 2001) and has an orbital period of 5.7 years. The orbit has a major semi-axis of approx. 3.1  AU with an eccentricity of 0.64. The minimum mass M · sin (i) of the object is 10 Jupiter masses.

In 2018 the discovery of the planet Pi Mensae c was announced. Its orbital period is around 6.27 days and its mass is around 5 Earth masses. Together with LHS 3844 b, it was the first exoplanet to be discovered using data from the TESS space telescope.

Individual evidence

  1. ↑ a b pi. Men. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on November 5, 2018 .
  2. ↑ a b c d e f g h i j Huang et al. (2018): TESS Discovery of a Transiting Super-Earth in the π Mensae System ; in: The Astrophysical Journal Letters 868 (2)
  3. ↑ pi Men c. In: Extrasolar Planets Encyclopaedia . Retrieved November 5, 2018 .
  4. ↑ a b c Bright Star Catalog