Astronomy:Kappa Chamaeleontis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Chamaeleon[1] |
| Right ascension | 12h 04m 46.471s[2] |
| Declination | −76° 31′ 08.62″[2] |
| Apparent magnitude (V) | 5.024[3] |
| Characteristics | |
| Spectral type | K4III[4] |
| U−B color index | +1.78[5] |
| B−V color index | +1.49[5] |
| Astrometry | |
| Radial velocity (Rv) | −2.19±0.19[4] km/s |
| Proper motion (μ) | RA: −77.818[2] mas/yr Dec.: 45.738[2] mas/yr |
| Parallax (π) | 6.4916 ± 0.0843[2] mas |
| Distance | 502 ± 7 ly (154 ± 2 pc) |
| Absolute magnitude (MV) | −0.78[1] |
| Details | |
| Mass | 1.4[6] M☉ |
| Radius | 45.2+1.7−1.2[2] R☉ |
| Luminosity | 472.0+29.5−15.8[2] L☉ |
| Surface gravity (log g) | 0.90+0.07−0.02[2] cgs |
| Temperature | 3,914+47−8[2] K |
| Rotational velocity (v sin i) | <1.0[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Chamaeleonitis is a single[8] star in the southern constellation of Chamaeleon. Its name is a Bayer designation that is Latinized from κ Chamaeleonitis, and abbreviated Kappa Cha or κ Cha. This object is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.024.[3] The distance to this object is approximately 490 light-years, based on the star's parallax.[2] It is drifting closer with a radial velocity of −2 km/s.[4]
This is an aging K-type giant star with a stellar classification of K4III,[4] having exhausted the supply of hydrogen at its core then cooled and expanded to its current size of 45[2] times the Sun's radius. It is a candidate periodic microvariable, with its brightness fluctuating by 0.005 magnitude at the rate of 0.25664 cycles per day.[9] The star is 1.4[6] times as massive as the Sun and is radiating 472 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,914 K.[2]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H.
- ↑ 4.0 4.1 4.2 4.3 4.4 de Medeiros, J. R. et al. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.
- ↑ 5.0 5.1 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J.
- ↑ 6.0 6.1 Chandler, Colin Orion et al. (2016). "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars". The Astronomical Journal 151 (3): 59. doi:10.3847/0004-6256/151/3/59. Bibcode: 2016AJ....151...59C.
- ↑ "kap Cha". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=kap+Cha.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society 331 (1): 45–59. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K.
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