Xi Pavonis

Xi Pavonis
Location of ξ Pavonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pavo
Right ascension 18h 23m 13.64610s[1]
Declination −61° 29′ 37.9364″[1]
Apparent magnitude (V) 4.35[2]
Characteristics
Spectral type K4III[3]
U−B color index +1.55[4]
B−V color index +1.46[2]
Astrometry
Radial velocity (Rv)+12.2±0.9[5] km/s
Proper motion (μ) RA: −5.985[1] mas/yr
Dec.: −0.538[1] mas/yr
Parallax (π)7.3600 ± 0.3753 mas[1]
Distance440 ± 20 ly
(136 ± 7 pc)
Absolute magnitude (MV)−1.16[2]
Orbit[6]
Period (P)2,214 d
Eccentricity (e)0.26
Periastron epoch (T)2,418,076.2 JD
Argument of periastron (ω)
(secondary)		187.2°
Semi-amplitude (K1)
(primary)		17.9 km/s
Details
Radius54.82+0.32
−3.92[1] R☉
Luminosity729±42[1] L☉
Temperature4,051+153
−117[1] K
Other designations
GLE 2, ξ Pav, CPD−61°6140, FK5 686, GC 25045, HD 168339, HIP 90098, HR 6855, SAO 254226, CCDM J18232-6130AB, WDS J18232-6130AB[7]
Database references
SIMBADdata

ξ Pavonis, Latinised as Xi Pavonis, is a triple star[8] system in the southern constellation of Pavo. It is visible to the naked eye as a faint star with a combined apparent visual magnitude of 4.35[2] The system is located approximately 440 light-years from the Sun based on parallax,[1] and it is drifting further away with a radial velocity of +12 km/s.[5]

This system forms the double star GLE 2, whose companion's magnitude is 8.6 with a 3.3″ angular separation, which was discovered by Australian amateur astronomer Walter Gale[9] in 1894. The primary component is itself a single-lined spectroscopic binary[10][11] with an orbital period of 6.06 years and an eccentricity of 0.26.[6] The visible member of this inner pair is an aging giant star with a stellar classification of K4III.[2]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference XHIP was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference MermiliodUBV was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Pourbaix2004 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).
  9. ^ Cite error: The named reference Argyle2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference CCDM was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Malkov2012 was invoked but never defined (see the help page).