Gamma Virginis

Starbox begin
name = Gamma Virginis A/BStarbox observe
epoch = J2000
ra = 12^h 41^m 39.6^s
dec = -1° 26′ 58″
appmag_v = 2.74 (3.48/3.50)
constell = VirgoStarbox character
class = F0 V/F0 V
b-v = 0.36
u-b = -0.05
variable = unknownStarbox astrometry
radial_v = -20
prop_mo_ra = -616.66
prop_mo_dec = 60.66
parallax = 84.53
p_error = 1.18
absmag_v = 2.38 (3.12/3.14)Starbox visbin
name=Gamma Virginis B
period = 171.37
axis = 3.746
eccentricity = 0.881
inclination = 146.05
node = 31.78
periastron = 1836.433Starbox catalog
names = Porrima, Arich, 29 Virginis, Gl 482 A/B, HR 4825/4826, BD -00°2601, HD 110379/110380, LHS 2604, LTT 4843/4844, GCTP 2924.00, SAO 138917, GC 17270, ADS 8630, CCDM 12417-0127, LFT 937/938, HIP 61941, TD1 16433.

Gamma Virginis (γ Vir / γ Virginis) is a star in the constellation Virgo. It also has the traditional names Porrima and Arich.

Gamma Virginis is a binary star, consisting of two stars of approximately equal apparent magnitudes 3.48 and 3.50, and of spectral type F0V. With an orbital period of 168.68 years (calculated by Heintz at Sproul Observatory in 1990) until the beginning of the 1990s it was an easy object for amateur astronomers, but now the smaller apparent distance between the stars requires a larger telescope. The last time they were at periapsis was in 1836. The distance will again be wide enough in 2020 to view with a small telescope. The star system has a combined apparent magnitude of 2.9. The system is 32 light years away from the Sun.

As Gamma Virginis is close to the ecliptic, it can be occulted by the Moon and (extremely rarely) by planets.

Changes of distance and position angle

This table shows the apparent distance between the two stars and their relative position angle: first three columns show data predicted from an orbit calculated in 1937, the next three columns show observations reported by the Hanwell Community Observatory.

External links

* [http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD+110379&Radius=10&CooEqui=2000&output.bib=&output.mes=o.catall%2C&output.mesdisp=N&Frame1=FK5&Equi1=2000.0&Epoch1=2000.0&Frame2=none&Equi2=1950.0&Epoch2=1950.0&Frame3=none&Equi3=2000.0&Epoch3=2000.0&FrameList=FK5&EquiList=2000.0&EpochList=2000.0&Bibyear1=1983&Bibyear2=2005&output.mesdisp=A SIMBAD Query results for HD 110379]
* [http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD+110380&Radius=10&CooEqui=2000&output.bib=&output.mes=o.catall%2C&output.mesdisp=N&Frame1=FK5&Equi1=2000.0&Epoch1=2000.0&Frame2=FK4&Equi2=1950.0&Epoch2=1950.0&Frame3=G&Equi3=2000.0&Epoch3=2000.0&FrameList=FK5&EquiList=2000.0&EpochList=2000.0&Bibyear1=1983&Bibyear2=2005&output.mesdisp=A SIMBAD Query results for HD 110380]