Sigma2 Gruis

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.

For other stars with this Bayer designation, see σ Gruis.

Sigma² Gruis

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
σ2 Gru, CD−41°14963, HD 214150, HIP 111643, HR 8602, SAO 231217, WDS J22370-4035[9]
Database references
SIMBAD	data