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Star in the constellation Grus From Wikipedia, the free encyclopedia
Sigma2 Gruis is a binary star[3] system in the southern constellation of Grus. Its apparent visual magnitude is 5.86.[2] The pair had an angular separation of 2.7 arc seconds along a position angle of 265°, as of 1991.[10] Located around 215 ly (66 pc) distant, the white-hued primary component is an A-type main-sequence star of spectral type A1V,[4] a star that is currently fusing its core hydrogen.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Grus |
Right ascension | 22h 36m 58.85405s[1] |
Declination | −40° 35′ 27.7272″[1] |
Apparent magnitude (V) | 5.86[2] (5.91 + 10.04)[3] |
Characteristics | |
Spectral type | A1 V[4] |
U−B color index | +0.06[2] |
B−V color index | +0.06[2] |
Astrometry | |
Radial velocity (Rv) | +15.0±2.9[5] km/s |
Proper motion (μ) | RA: +44.56[1] mas/yr Dec.: −70.07[1] mas/yr |
Parallax (π) | 15.19 ± 0.53 mas[1] |
Distance | 215 ± 7 ly (66 ± 2 pc) |
Absolute magnitude (MV) | +1.76[6] |
Details[7] | |
σ2 Gru A | |
Mass | 2.15 M☉ |
Luminosity | 17.5[6] L☉ |
Surface gravity (log g) | 4.36±0.14 cgs |
Temperature | 9,549±325 K |
Rotational velocity (v sin i) | 80.9±0.7[8] km/s |
Age | 255 Myr |
Other designations | |
Database references | |
SIMBAD | data |
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