Nu Gruis

Nu Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 28m 39.21034s[1]
Declination −39° 07′ 54.4505″[1]
Apparent magnitude (V) 5.47[2]
Characteristics
Spectral type G9 III[3]
B−V color index +0.95[2]
Astrometry
Radial velocity (Rv)+10.6[4] km/s
Proper motion (μ) RA: +37.43[5] mas/yr
Dec.: −160.51[5] mas/yr
Parallax (π)11.6404 ± 0.1235 mas[1]
Distance280 ± 3 ly
(85.9 ± 0.9 pc)
Absolute magnitude (MV)+0.76[6]
Details
Radius9.68+0.30
−0.26[1] R☉
Luminosity51.9+0.3
−0.7[1] L☉
Surface gravity (log g)2.63±0.08[7] cgs
Temperature4,893±24[7] K
Metallicity [Fe/H]−0.41±0.02[7] dex
Other designations
ν Gru, CD−39° 14723, FK5 845, HD 212953, HIP 110936, HR 8552, SAO 213850, WDS J22287-3908[8]
Database references
SIMBADdata

ν Gruis, Latinised as Nu Gruis, is a solitary,[9] yellow-hued star in the southern constellation of Grus. It is visible to the naked eye with an apparent visual magnitude of 5.47.[2] The distance to this star, as determined using an annual parallax shift of 11.6 mas as seen from the Earth,[1] is 280 light years. It is drifting further away with a heliocentric radial velocity of +11 km/s.[4]

This is an evolved G-type giant star with a stellar classification of G9 III,[3] a star that has used up its core hydrogen and has expanded. At present it has ten[1] times the radius of the Sun and is radiating 52[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,893 K.[7] It has a visual magnitude 12.50 companion, not visible even through binoculars, located at an angular separation of 21.70 arc seconds along a position angle of 74°, as of 2011.[10]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference gcrv1953 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Alves2015 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 Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).