Xi Puppis

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Xi Puppis
Diagram showing star positions and boundaries of the Puppis constellation and its surroundings
Cercle rouge 100%.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
Distance 1,200 ± 90 ly
(370 ± 30 pc)
Absolute magnitude (MV) –4.73[5]
Mass 9.9 ± 1.0[3] M
Surface gravity (log g) 1.21 ± 0.09[3] cgs
Temperature 4,880 ± 150[3] K
Age 23[3] Myr
Other designations
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 (Xi Pup, ξ Puppis, ξ Pup) is a star 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. It is a yellow supergiant. It has the traditional name Asmidiske (Azmidiske), a misplacement and mistransliteration of Aspidiske, the traditional name of ι Carinae. Based on parallax measurements made during the Hipparcos mission, it is located approximately 1,200 light-years (370 parsecs) away, with a 7.5% margin of error.[1] Because of the distance of this star from the Earth, its visual magnitude is reduced by 0.73 as a result of extinction from the intervening gas and dust.[5]

Asmidiske has a 13th magnitude companion at an apparent distance of 5".1 while it may also be a spectroscopic binary.


  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:0708.1752free to read, 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:0911.1335free to read, 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 

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