Sigma1 Gruis

For other stars with this Bayer designation, see σ Gruis.
Sigma1 Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 36m 29.30230s[1]
Declination −40° 34′ 57.7391″[1]
Apparent magnitude (V) 6.26[2]
Characteristics
Spectral type A3 Vn[2]
B−V color index +0.12[2]
Astrometry
Radial velocity (Rv)+6.9±3.4[3] km/s
Proper motion (μ) RA: +46.00[4] mas/yr
Dec.: −72.64[4] mas/yr
Parallax (π)14.2651 ± 0.0751 mas[1]
Distance229 ± 1 ly
(70.1 ± 0.4 pc)
Absolute magnitude (MV)+2.11[5]
Details[6]
Mass2.00 M☉
Radius2.0[7] R☉
Luminosity12[5] L☉
Surface gravity (log g)4.24±0.14 cgs
Temperature9,230±314 K
Rotational velocity (v sin i)163.4±2.0[8] km/s
Age194 Myr
Other designations
σ1 Gru, CD−41° 14959, FK5 3811, HD 214085, HIP 111594, HR 8600, SAO 231211[9]
Database references
SIMBADdata

Sigma1 Gruis, a Latinization of σ1 Gruis, is a star in the constellation Grus. It is a dim, white-hued star near the lower limit for visibility to the naked eye with an apparent visual magnitude of 6.26.[2] This object is located 229 light-years (70.1 pc) distant from the Sun based on parallax.[1] The radial velocity of this star is poorly constrained, but it appears to be drifting further away at the rate of +7 km/s.[3]

This is an A-type main-sequence star with a stellar classification of A2 Vn; a star that is currently fusing its core hydrogen. It has a relatively high rate of spin as indicated by the 'n' suffix, showing a projected rotational velocity of 163 km/s.[8] This object is 194 million years old with double the mass[6] and radius of the Sun.[7] The star is radiating 12[5] times the luminosity of the Sun from its photosphere at an effective temperature of 9,230 K.[6] It is a source of X-ray emission, which may indicate it has an unseen stellar companion.[10]

  1. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Evans1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Diaz2011 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).