Gamma Virginis

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Double star
γ Virginis
Observation
dates equinox :  J2000.0 , epoch : J2000.0
AladinLite
Constellation Virgin
Right ascension 12 h 41 m 39.6 s
declination -01 ° 26 ′ 58 ″
Apparent brightness  2.7 likes
Astrometry
parallax (84.53 ± 1.18) mas
distance  (38.6 ± 0.5) ly
((11.8 ± 0.2) pc )
orbit 
period (168.93 ± 0.30) a
Major semi-axis 3 ", 662 ± 0", 013
eccentricity 0.8825 ± 0.0010
Orbit inclination 148 °, 82 ± 0 °, 43
Argument of the node 213 °, 79 ± 0 °, 72
Epoch of the periastron 2005.44 ± 0.07
Argument of the periapsis 73 °, 78 ± 0 °, 60
Individual data
Names A; B.
Typing:
Spectral class A. F0 V
B. F0 V
Other names
and catalog entries
Bayer name γ Virginis
Flamsteed name 29 Virginis
Bonn survey BD −0 ° 2601
SAO catalog SAO 138917 [1]
Hipparcos catalog HIP 61941 [2]
Bright Star Catalog HR 4825 HR 4826
Henry Draper Catalog HD 110379 HD 110380
Tycho catalog TYC 4949-1120-1 [3] TYC 4949-1120-2 [4]
WDS catalog WDS 12417-0127
Further designations: Gliese 482 • Σ 1670
  LHS 2604 LHS 2605

γ Virginis ( Gamma Virginis , γ Vir ) is a binary star consisting of two almost equally bright main sequence stars with magnitudes of 3.48  mag and 3.50 mag, both of which belong to the spectral type F0. The apparent overall brightness is 2.7 mag. The system is approximately 38.6  light years from the sun .

The system has a period of 169 years, during which the angular distance between the two components fluctuates between 0.3 "and 6.2". Outside the period of closest approach, it is a popular object with amateur astronomers, while at the time of closest approach, a larger device is needed for separation. The two components last reached their closest convergence in 2005; since then they have moved away from each other and in 2019 is again 2.8 ".

The star bears the historical proper name Porrima (name of an Italian goddess of birth). As a star close to the ecliptic, it can be covered by the moon and (rarely) planets.

The IAU has the historical proper names on July 20, 2016 Porrima defined as standardized proper name for the star HR 4825th The second star HR 4826 therefore has no proper name.

Web links

Individual evidence

  1. ↑ Bulletin of the IAU Working Group on Star Names, No. 1, July 2016. (PDF) Retrieved November 9, 2016 (English, 184 KiB).