Chi Puppis

χ Puppis
Location of χ Puppis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 57m 40.10678s[1]
Declination −30° 20′ 04.4491″[1]
Apparent magnitude (V) 4.79[2]
Characteristics
Spectral type A5 II[3] or A7 III[4] or A2 Vv[5]
U−B color index +0.16[2]
B−V color index +0.151±0.012[6]
Astrometry
Radial velocity (Rv)+30.0±0.5[7] km/s
Proper motion (μ) RA: −8.643[1] mas/yr
Dec.: +6.055[1] mas/yr
Parallax (π)1.7957 ± 0.1890 mas[1]
Distanceapprox. 1,800 ly
(approx. 560 pc)
Absolute magnitude (MV)−3.07[6]
Details
Radius30.39+1.53
−1.70[1] R☉
Luminosity3,116±374[1] L☉
Surface gravity (log g)2.17[8] cgs
Temperature7,823+229
−190[1] K
Rotational velocity (v sin i)39.2±0.3[9] km/s
Other designations
chi Pup, NSV 3830, CD−29°5236, FK5 1210, GC 10774, HD 65456, HIP 38901, HR 3113, SAO 198636, GSC 07120-02422[10]
Database references
SIMBADdata

χ Puppis, Latinised as Chi Puppis, is a single[11] star in the southern constellation of Puppis. It has a white hue and is faintly visible to the eye at night with an apparent visual magnitude of 4.79.[2] The star is located at a distance of approximately 1,800 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +30 km/s.[7] O. J. Eggen listed this star as a member of the Hyades Stream based on its space motion.[12]

There has been some disagreement as to the stellar classification of Chi Puppis. In 1962, W. Buscombe classified it as A2Vvar,[13] matching a variable A-type main-sequence star. However, P. S. Conti in 1965 considered that to be a misclassification on the basis of its B-V color index. He considers it of later type A5.[14] In their study of the nearby open cluster NGC 2483, M. P. Fitzgerald and A. F. J. Moffat used the same class, A2Vv.[5] In 1979, Nancy Houk assigned it to class A7 III,[4] indicating it may be an A-type giant star. Finally, R. O. Gray and associates found a class of A5 II,[3] matching a bright giant.

In his star atlas Neue Uranometrie, Friedrich Wilhelm Argelander labelled this star as χ Argo. It was probably labelled as χ by Bayer in the original Uranometria, although Bayer's chart is somewhat fanciful. Nicolas-Louis de Lacaille changed Bayer's designations in Argo Navis and applied χ to the star now called χ Carinae.[15]

  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 Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray_et_al_2001a was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1979 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Fitzgerald_Moffat_1975 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Gray_et_al_2001b was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Díaz_et_al_2011 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggen1996 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Buscombe1962 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Conti1965 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Hoffleit_Warren_1991 was invoked but never defined (see the help page).