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κ Pyxidis

Location of κ Pyxidis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Pyxis
Right ascension	09 08 02.88015
Declination	–25° 51′ 30.7331″
Apparent magnitude (V)	4.62
Characteristics
Spectral type	K4III
U−B color index	+1.87
B−V color index	+1.594±0.004
Astrometry
Radial velocity (Rv)	−44.7±2.8 km/s
Proper motion (μ)	RA: +34.771 mas/yr Dec.: +0.009 mas/yr
Parallax (π)	6.3116 ± 0.2408 mas
Distance	520 ± 20 ly (158 ± 6 pc)
Absolute magnitude (MV)	−1.53
Details
Radius	66.70+0.34 −2.34 R☉
Luminosity	927±40 L☉
Surface gravity (log g)	1.44±0.22 cgs
Temperature	3,931±31 K
Metallicity	−0.22±0.08 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
SIMBAD	data

Kappa Pyxidis, Latinized from κ Pyxidis, is a single, orange-hued star in the southern constellation of Pyxis. It is visible to the naked eye as a faint point of light with an apparent visual magnitude of +4.62. The star is located approximately 520 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −45 km/s and may come as close as 308 light-years in around 2.6 million years. It is moving through space at the rate of 53.7 km/s relative to the Sun and is following an orbit through the Milky Way galaxy with a large eccentricity of 0.68

This is an aging giant with a stellar classification of K4III, having exhausted the supply of hydrogen at its core then expanded and cooled. At present it has 67 times the radius of the Sun. 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. The star radiates 927 times the luminosity of the Sun from its bloated photosphere at an effective temperature of 3,931 K. A magnitude 10 visual companion is located at an angular separation of 2.1 arcseconds.

References

1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. ^ 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, S2CID 119257644.
3. ^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins Catalog of Revised MK Types for the Cooler Stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
4. 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.
5. ^ 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, S2CID 59451347, A61.
6. ^ 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, S2CID 54940439.
7. "kap Pyx". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-14.
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, S2CID 14878976.
9. Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.
10. Privett, Grant; Jones, Kevin (2013), The Constellation Observing Atlas, New York, New York: Springer Science & Business Media, p. 168, Bibcode:2013coa..book.....P, ISBN 9781461476481.

v t e Constellation of Pyxis
List of stars in Pyxis Pyxis in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η θ κ λ Variable T RZ TY UZ VW VY WX XX AK CS HR 3384 3597 HD 73267 77338 Other Gliese 317 Gliese 318
Exoplanets Gliese 317 b HD 73256 b HD 73267 b
Star clusters NGC 2627 Pyxis globular cluster
Nebulae K 1-2 NGC 2818
Galaxies	NGC 2613 2663 Other Hen 2-10
Category

• K-type giants
• Bayer objects
• Pyxis
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects