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ξ Puppis
	Location of ξ Puppis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Puppis
Right ascension	07h 49m 17.65567s
Declination	−24° 51′ 35.2305″
Apparent magnitude (V)	3.35
Characteristics
Spectral type	G6 Iab-Ib
U−B color index	+1.18
B−V color index	+1.25
Astrometry
Radial velocity (Rv)	+2.7 km/s
Proper motion (μ)	RA: −4.81 mas/yr ; Dec.: −0.89 mas/yr
Parallax (π)	2.72 ± 0.21 mas
Distance	1,200 ± 90 ly ; (370 ± 30 pc)
Absolute magnitude (MV)	–3.89
Details
Mass	9.9 ± 1.0 M☉
Radius	124 R☉
Luminosity	6,824±641 L☉
Surface gravity (log g)	1.21±0.14 cgs
Temperature	4,712±125, 4,925 K
Metallicity [Fe/H]	+0.13 dex
Rotational velocity (v sin i)	9.2 km/s
Age	23 Myr
Other designations
	Azmidi, Azmidiske, Asmidiske, ξ Puppis, ξ Pup, Xi Pup, 7 Puppis, CCDM J07493-2452A; CPD−24 2939, FK5 1204, GC 10562, HD 63700, HIP 38170, HR 3045, IDS 07451-2437 A, PPM 253258, SAO 174601, WDS J07493-2452A.
Database references
SIMBAD	data

Xi Puppis (ξ Puppis, abbreviated Xi Pup, ξ Pup) is a multiple star system in the southern constellation of Puppis. With an apparent visual magnitude of 3.35,^[2] it is one of the brighter members of this constellation. Based on parallax measurements made during the Hipparcos mission, it is located approximately 1,200 light-years (370 parsecs) from the Sun, with a 7.5% margin of error.^[1]

The system consists of a spectroscopic binary, designated Xi Puppis A,^[8] together with a third companion star, Xi Puppis B. A's two components are themselves designated Xi Puppis Aa (formally named Azmidi /ˈæzmɪdi/)^[9] and Ab.

Nomenclature

ξ Puppis (Latinised to Xi Puppis) is the system's Bayer designation. The designations of the two constituents as Xi Puppis A and B, and those of A's components - Xi Puppis Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).^[10]

The system was sometimes known as Asmidiske (Azmidiske), a misspelling and misplacement of Aspidiske (from the Greek for 'little shield), the traditional name of Iota Carinae.^[11] In 2016, the IAU organized a Working Group on Star Names (WGSN)^[12] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.^[13] It approved the name Azmidi for the component Xi Puppis Aa on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.^[9]

Properties

Because of the distance of this system from the Earth, its visual magnitude is reduced by 0.73 as a result of extinction from the intervening gas and dust.^[14]

Xi Puppis A presents as a yellow supergiant of spectral class G6 with a luminosity 8,300 times that of the Sun.^[11]

The 13th-magnitude companion, Xi Puppis B, is about 5 arcseconds distant and is a Sun-like star that orbits at least 2000 AU away with an orbital period of at least 26,000 years.^[11]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
^ ^a ^b ^c ^d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
^ ^a ^b ^c ^d Lyubimkov, Leonid S.; et al. (February 2010), "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society, 402 (2): 1369–1379, arXiv:0911.1335, Bibcode:2010MNRAS.402.1369L, doi:10.1111/j.1365-2966.2009.15979.x, S2CID 119096173
^ Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institute of Washington D.C. Bibcode:1953GCRV..C......0W.
^ ^a ^b ^c Luck, R. Earle (2014-06-01). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137. ISSN 0004-6256. Xi Puppis' database entry at VizieR.
^ ^a ^b ^c McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society, 471: 770–791, arXiv:1706.02208, doi:10.1093/mnras/stx1433, ISSN 0035-8711 Xi Puppis' database entry at VizieR.
^ De Medeiros, J. R.; Udry, S.; Burki, G.; Mayor, M. (2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics. 395: 97–98. arXiv:1312.3474. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214.
^ "Washington Double Star Catalog". United States Naval Observatory. Retrieved 20 June 2018.
^ ^a ^b "Naming Stars". IAU.org. Retrieved 18 June 2018.
^ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
^ ^a ^b ^c Kaler, James B., "ASMIDISKE (Xi Puppis)", Stars, University of Illinois, retrieved 2018-06-20
^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
^ "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 5. Retrieved 2018-07-14.
^ Luck, R. E. (May 1, 1982), "The chemical composition of late-type supergiants. IV - Homogeneous abundances and galactic metallicity trends", Astrophysical Journal, Part 1, 256: 177–188, Bibcode:1982ApJ...256..177L, doi:10.1086/159895