Pi Mensae
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 |
|||||||||||||||||||||
|
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
- ↑ a b pi. Men. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on November 5, 2018 .
- ↑ 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)
- ↑ pi Men c. In: Extrasolar Planets Encyclopaedia . Retrieved November 5, 2018 .
- ↑ a b c Bright Star Catalog