HD 89707

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Star
HD 89707
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Water snake
Right ascension 10 h 20 m 49.98 s
declination -15 ° 28 ′ 47.7 ″
Apparent brightness 7.17 likes
Typing
Spectral class G1 V
Astrometry
Radial velocity (82.5 ± 0.4) km / s
parallax (30.55 ± 0.58)  mas
distance (106.8 ± 2.0)  Lj
(32.73 ± 0.62)  pc  
Visual absolute brightness M vis +4.60 mag
Proper movement 
Rec. Share: (−218.99 ± 0.53)  mas / a
Dec. portion: (295.88 ± 0.53)  mas / a
Physical Properties
radius 1.14  R ☉
Effective temperature 5940  K
Other names
and catalog entries
Bonn survey BD −14 ° 3093
Henry Draper Catalog HD 89707 [1]
Hipparcos catalog HIP 50671 [2]
SAO catalog SAO 155919 [3]
Tycho catalog TYC 6060-202-1 [4]Template: Infobox star / maintenance / specification of the TYC catalog
Other names GJ 9325 • LTT 3799
annotation
  1. ↑ Calculated from apparent brightness and distance.

HD 89707 is a main sequence star of spectral class G1 in the constellation Water Snake , about 113  light years from Earth . With an apparent magnitude of 7.19 mag, it can no longer be seen with the naked eye, even under optimal observation conditions. The star has a spectroscopic companion that is believed to be a brown dwarf .

Spectroscopic companion

HD 89707 is orbited by a spectroscopic companion with an orbital period of 297.7 days on a strongly elliptical orbit with an eccentricity of 0.95. It is assumed that the companion is a brown dwarf.

Sources and individual references

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ Pulkovo radial velocities for 35493 HIP stars
  3. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  4. ↑ Halbwachs et al .: Exploring the brown dwarf desert with Hipparcos ; in: Astronomy and Astrophysics, Vol. 355, pp. 581ff. (2000), bibcode : 2000A & A ... 355..581H
  5. ↑ Ribas, Ignasi; Jordi, Miralda-Escudé: The eccentricity-mass distribution of exoplanets: signatures of different formation mechanisms? ; in: Astronomy and Astrophysics, Vol. 464, Issue 2, pp. 779ff. (2007), bibcode : 2007A & A ... 464..779R