Gamma Virginis
 Porrima in Virgo. |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 41m 39.64344s |
| Declination | –01° 26′ 57.7421″ |
| Apparent magnitude (V) | 2.74 (3.650/3.560) |
| Characteristics | |
| Spectral type | F0 V/F0 V |
| U−B color index | -0.05 |
| B−V color index | 0.36 |
| Variable type | unknown |
| Astrometry | |
| Radial velocity (Rv) | -19.5 km/s |
| Proper motion (μ) |
RA: –614.76 mas/yr Dec.: 61.34 mas/yr |
| Parallax (π) | 85.58 ± 0.60mas |
| Distance | 38.1 ± 0.3 ly (11.68 ± 0.08 pc) |
| Absolute magnitude (MV) | 2.38 (3.12/3.14) |
| Orbit | |
| Companion | Gamma Virginis B |
| Period (P) | 168.93 ± 0.30 yr |
| Semi-major axis (a) | 3.662 ± 0.013" |
| Eccentricity (e) | 0.8825 ± 0.0010 |
| Inclination (i) | 148.82 ± 0.43° |
| Longitude of the node (Ω) | 213.79 ± 0.72° |
| Periastron epoch (T) | 2005.438 ± 0.067 |
| Details | |
| Mass | 1.56 M☉ |
| Surface gravity (log g) | 4.26 cgs |
| Temperature | 6,757 K |
| Metallicity [Fe/H] | –0.07 dex |
| Age | 1.14 Gyr |
| Other designations | |
| γ Vir A: HD 110379, HR 4825, LFT 937, LTT 4843 | |
| γ Vir B: HD 110380, HR 4826, LFT 937, LTT 4844 | |
| Database references | |
| SIMBAD | data |
Gamma Virginis (γ Virginis, abbreviated Gamma Vir, γ Vir), also named Porrima, is a binary star system in the constellation of Virgo.
γ Virginis (Latinised to Gamma Virginis) is the star's Bayer designation.
The traditional name Porrima derives from Ancient Rome, Porrima (also known as Antevorta) was one of the Camenae or goddesses of prophecy. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included Porrima for this star.
In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Laouiyet al Aoua, which was translated into Latin as Angulus Latratoris, meaning 'the angle of the barker'. This star, along with Beta Virginis (Zavijava), Eta Virginis (Zaniah), Delta Virginis (Auva) and Epsilon Virginis (Vindemiatrix), were Al ʽAwwāʼ, the Barker.
In Chinese, 太微左垣 (Tài Wēi Zuǒ Yuán), meaning Left Wall of Supreme Palace Enclosure, refers to an asterism consisting of Gamma Virginis, Eta Virginis, Delta Virginis, Epsilon Virginis and Alpha Comae Berenices. Consequently, Gamma Virginis itself is known as 太微左垣二 (Tài Wēi Zuǒ Yuán èr, English: the Second Star of Left Wall of Supreme Palace Enclosure.), representing 東上相 (Dōngshǎngxiāng), meaning The First Eastern Minister. 東上相 (Dōngshǎngxiāng), westernized into Shang Seang by R.H. Allen and the meaning is "the High Minister of State".
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