Xi Puppis

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ξ Puppis
Puppis constellation map.svg
Red circle.svg
Location of ξ Puppis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 49m 17.65567s[1]
Declination −24° 51′ 35.2305″[1]
Apparent magnitude (V) 3.35[2]
Spectral type G6 Iab-Ib[3]
U−B color index +1.18[2]
B−V color index +1.25[2]
Radial velocity (Rv)+2.7[4] km/s
Proper motion (μ) RA: −4.81[1] mas/yr
Dec.: −0.89[1] mas/yr
Parallax (π)2.72 ± 0.21[1] mas
Distance1,200 ± 90 ly
(370 ± 30 pc)
Absolute magnitude (MV)–4.73[5]
Mass9.9 ± 1.0[3] M
Luminosity60,000[6] L
Surface gravity (log g)1.21 ± 0.09[3] cgs
Temperature4,880 ± 150[3] K
Metallicity [Fe/H]+0.24[7] dex
Rotational velocity (v sin i)9.2[8] km/s
Age23[3] 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

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,[9] together with a third companion star, Xi Puppis B. A's two components are themselves designated Xi Puppis Aa (also named Azmidi[10]) and Ab.


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).[11]

The system was sometimes known as Asmidiske (Azmidiske), a mis-spelling and misplacement of Aspidiske (from the Greek for 'little shield), the traditional name of Iota Carinae.[12] In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[14] 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.[10]


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.[5]

Xi Puppis A presents as a yellow supergiant of spectral class G6 with a luminosity 8,300 times that of the Sun.[12]

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.[12]


  1. ^ 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:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 
  2. ^ 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 
  3. ^ a b c d e 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:0911.1335Freely accessible, Bibcode:2010MNRAS.402.1369L, doi:10.1111/j.1365-2966.2009.15979.x 
  4. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institute of Washington D.C. Bibcode:1953GCRV..C......0W. 
  5. ^ a b 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 
  6. ^ Reimers, D.; Huensch, M.; Schmitt, J. H. M. M.; Toussaint, F. (1996). "Hybrid stars and the reality of "dividing lines" among G to K bright giants and supergiants". Astronomy and Astrophysics. 310: 813. Bibcode:1996A&A...310..813R. 
  7. ^ Malagnini, M. L.; Morossi, C.; Buzzoni, A.; Chavez, M. (2000). "Observations and Atmospheric Parameters of Super-Metal-rich Candidates". The Publications of the Astronomical Society of the Pacific. 112 (777): 1455. Bibcode:2000PASP..112.1455M. doi:10.1086/317714. 
  8. ^ 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. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214. 
  9. ^ "Washington Double Star Catalog". United States Naval Observatory. Retrieved 20 June 2018. 
  10. ^ a b "Naming Stars". IAU.org. Retrieved 18 June 2018. 
  11. ^ 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:1012.0707Freely accessible [astro-ph.SR]. 
  12. ^ a b c Kaler, James B., "ASMIDISKE (Xi Puppis)", Stars, University of Illinois, retrieved 2018-06-20 
  13. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016. 
  14. ^ "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 5. Retrieved 2018-07-14. 

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