Xi Pavonis

Triple star system in the constellation Pavo

Xi Pavonis
Observation data Epoch J2000 Equinox J2000
Location of ξ Pavonis (circled)
Constellation	Pavo
Right ascension	18^h 23^m 13.64610^s^[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 (R_v)	+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]
Distance	440 ± 20 ly (136 ± 7 pc)
Absolute magnitude (M_V)	−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

Radius	54.82+0.32 −3.92^[1] `R`_☉
Luminosity	729±42^[1] `L`_☉
Temperature	4,051+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
SIMBAD	data

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]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d ^e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
^ Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1975mcts.book.....H.
^ Mermilliod, J. C. (2006). "Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
^ ^a ^b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
^ ^a ^b Pourbaix, D.; et al. (2004). "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits". Astronomy & Astrophysics. 424: 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213.
^ "ksi Pav". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-08.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
^ Argyle, Bob (August 2008). "Double Star of the Month". The Webb Deep-Sky Society. Retrieved 2019-10-08.
^ Dommanget, J.; Nys, O. (2002). "CCDM (Catalog of Components of Double & Multiple stars) (Dommanget+ 2002)". VizieR On-line Data Catalog: I/274. Originally Published in: Observations et Travaux 54. 1274. Bibcode:2002yCat.1274....0D. Vizier catalog entry
^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. Vizier catalog entry

Constellation of Pavo

Stars

Bayer	α (Peacock) β γ δ ε ζ η θ ι κ λ μ¹ μ² ν ξ ο π ρ σ τ υ φ¹ φ² ω
Variable	R V X Y SX AR BD KZ MW NU NZ V346 V347
HR	6586 6624 6634 6740 6760 6796 6805 6808 6828 6899 6908 6939 6996 7004 7012 7015 7022 7027 7111 7130 7161 7221 7278 7320 7383 7434 7435 7455 7498 7513 7527 7531 7558 7579 7587 7588 7644 7663 7691 7707 7732 7838 7872 7959 8019 8061 8073 8081 8125 8159
HD	161475 162521 164427 175007 175167 176522 179419 181433 186302 190984 192887 195190 195772 196050
Other	Gliese 693 SCR 1845−6357 SCR 1826−6542