Kappa Pyxidis

Kappa Pyxidis
Diagram showing star positions and boundaries of the Pyxis constellation and its surroundings
Location of κ Pyxidis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pyxis
Right ascension 09h 08m 02.88045s[1]
Declination –25° 51′ 30.7303″[1]
Apparent magnitude (V) 4.56[2]
Characteristics
Spectral type K4/K5III[3]
U−B color index +1.87[2]
B−V color index +1.61[2]
Astrometry
Radial velocity (Rv)−44.7±2.8[4] km/s
Proper motion (μ) RA: 35.65±0.41[1] mas/yr
Dec.: 0.30±0.27[1] mas/yr
Parallax (π)5.82 ± 0.55[1] mas
Distance560 ± 50 ly
(170 ± 20 pc)
Absolute magnitude (MV)−1.53[5]
Details
Luminosity965[6] L☉
Surface gravity (log g)1.44±0.22[7] cgs
Temperature3,931±31[7] K
Metallicity [Fe/H]−0.22±0.08[7] dex
Other designations
κ Pyx, CPD−25° 4067, GC 12614, HD 78541, HIP 44824, HR 3628, SAO 177002, PPM 255695, CCDM J09080-2552AB, WDS J09080-2552AB
Database references
SIMBADdata

Kappa Pyxidis, Latinized from κ Pyxidis, is a single[8] star in the constellation of Pyxis, with an apparent magnitude of +4.62. This is an orange K-type giant. Approximately 500 light years from Earth, it shines with a luminosity approximately 965 times that of the Sun and has a surface temperature of 4031 K.[6] It is a variable star of uncertain type, changing brightness with an amplitude of 0.0058 in visual magnitude over a period of 8.5 days.[9] A magnitude 10 visual companion is 2.1 arcseconds distant from it.[10]

Kappa Pyxidis is moving through the Galaxy at a speed of 53.7 km/s relative to the Sun. It will come closest to the Sun 2.6 million years from now when it will brighten to magnitude 3.34 from a distance of 308 light years.[11]

References

  1. 1 2 3 4 5 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.
  2. 1 2 3 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. ↑ Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  4. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. ↑ 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.
  6. 1 2 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  7. 1 2 3 Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769.
  8. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  9. ↑ Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331: 45. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.
  10. ↑ Privett, Grant; Jones, Kevin (2013). The Constellation Observing Atlas. New York, New York: Springer Science & Business Media. p. 168. ISBN 9781461476481.
  11. ↑ Kappa Pyxidis (HIP 44824)
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