Theta Gruis

Theta Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 23h 06m 52.73046s[1]
Declination −43° 31′ 13.2857″[1]
Apparent magnitude (V) 4.28[2] (4.51 + 6.84 + 7.80)[3]
Characteristics
Spectral type kF3VhF5mF5(II-III)[4] + ? + G2V[3]
U−B color index +0.16[2]
B−V color index +0.42[2]
Astrometry
Radial velocity (Rv)+9.6[5] km/s
Proper motion (μ) RA: −47.17[1] mas/yr
Dec.: −13.49[1] mas/yr
Parallax (π)24.73 ± 0.45 mas[1]
Distance132 ± 2 ly
(40.4 ± 0.7 pc)
Absolute magnitude (MV)+1.25[6]
Details
θ Gru A
Luminosity27[6] L☉
Rotational velocity (v sin i)64[7] km/s
Other designations
θ Gru, CD−44° 15149, HD 218227, HIP 114131, HR 8787, SAO 231444[8]
Database references
SIMBADdata

Theta Gruis, Latinized from θ Gruis, is a triple star[3] system in the southern constellation of Grus. Its combined apparent visual magnitude is 4.28,[2] which is bright enough to be seen with the naked eye. The system contains a magnetic Delta Delphini-like[9] F5 star with a close fainter companion, plus a more distant G2 main sequence star.[3]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Nicolet1978 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gray1989 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference uesugi_fukuda70 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Renson2009 was invoked but never defined (see the help page).