Lambda Gruis

Lambda Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 06m 06.88568s[1]
Declination −39° 32′ 36.0659″[1]
Apparent magnitude (V) 4.47[2]
Characteristics
Evolutionary stage giant
Spectral type K3 III[3]
U−B color index +1.628[2]
B−V color index +1.369[2]
Astrometry
Radial velocity (Rv)+38.80[4] km/s
Proper motion (μ) RA: −23.80[1] mas/yr
Dec.: −124.58[1] mas/yr
Parallax (π)13.47 ± 0.22 mas[1]
Distance242 ± 4 ly
(74 ± 1 pc)
Absolute magnitude (MV)+0.12[5]
Details[6]
Mass2.4 M☉
Radius22.3 R☉
Luminosity155 L☉
Surface gravity (log g)2.13 cgs
Temperature4,269 K
Other designations
λ Gru, CD−40° 14639, FK5 1581, HD 209688, HIP 109111, HR 8411, SAO 213543[7]
Database references
SIMBADdata

Lambda Gruis, Latinized from λ Gruis, is a solitary,[8] orange-hued star in the southern constellation of Grus. With an apparent visual magnitude of 4.47,[2] it is visible to the naked eye as a faint point of light. The distance to this star, as determined using an annual parallax shift of 13.47 mas as seen from the Earth,[1] is around 242 light years. It is drifting further away with a radial velocity of +39 km/s,[4] having come to within 183 light-years some 805,000 years ago.[5]

This is an evolved K-type giant star with a stellar classification of K3 III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. It has about 2.4 times the mass of the Sun and has expanded to 22.3 times the Sun's radius. The star is radiating 155 times the Sun's luminosity from its photosphere at an effective temperature of 4,269 K.[6]

  1. ^ a b c d e f 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 Jennens1975 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Cruzalebes2010 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).