HD 112758

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Double star
HD 112758
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Virgin
Right ascension 12 h 59 m 1.56 s
declination -09 ° 50 ′ 2.6 ″
Apparent brightness 7.59 likes
Typing
B − V color index +0.80 
U − B color index +0.35 
R − I index +0.43 
Spectral class G9 V
Astrometry
Radial velocity (+4.2 ± 0.3) km / s
parallax (46.44 ± 0.37)  mas
distance (70.2 ± 0.6)  ly
(21.5 ± 0.2)  pc
Proper movement 
Rec. Share: (−826.17 ± 0.55)  mas / a
Dec. portion: (+192.97 ± 0.42)  mas / a
Physical Properties
radius 0.79  R ☉
Effective temperature 5250  K
Other names
and catalog entries
Bonn survey BD −9 ° 3595
Henry Draper Catalog HD 112758 [1]
Gliese catalog FY 491 [2]
Hipparcos catalog HIP 63366 [3]
SAO catalog SAO 139081 [4]
Tycho catalog TYC 5536-983-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J12590162-0950029 [6]
Other names LHS 2656

HD 112758 is a main sequence star in the constellation Virgo, about 69  light years from Earth . With an apparent magnitude of 7.56 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 red dwarf .

Spectroscopic companion

The originally estimated minimum mass of 35 Jupiter's masses left open the possibility that the companion could be a brown dwarf . However, later investigations with the inclusion of Hipparcos measurements showed that it is most likely a stellar companion. These studies revealed a mass of (0.20 ± 0.04)  M ☉ , wherein the minimum mass 3σ within the interval in 0.032 M ☉ lay.
The orbit of the spectroscopic companion has a period of (103.26 ± 0.03) days and an eccentricity of (0.139 ± 0.010).

Web links

Individual evidence

  1. ↑ a b c d e f g h HD 112758. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed November 16, 2018 .
  2. ↑ Pulkovo radial velocities for 35493 HIP stars
  3. ↑ Halbwachs et al .: Exploring the brown dwarf desert with Hipparcos ; in: Astronomy and Astrophysics, Vol. 355, pp. 581ff. (2000), bibcode : 2000A & A ... 355..581H
  4. ↑ 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