Astronomy:Phi Capricorni

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Short description: Star in the constellation Capricornus
Phi Capricorni
Location of φ Capricorni (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Capricornus
Right ascension  21h 15m 37.900s[1]
Declination −20° 39′ 06.10″[1]
Apparent magnitude (V) +5.16[2]
Characteristics
Evolutionary stage horizontal branch (86%)[3]
Spectral type K0 II-III[4]
B−V color index +1.15[2]
Astrometry
Radial velocity (Rv)−4.5±0.5[5] km/s
Proper motion (μ) RA: +13.850[1] mas/yr
Dec.: −2.682[1] mas/yr
Parallax (π)4.8754 ± 0.1154[1] mas
Distance670 ± 20 ly
(205 ± 5 pc)
Absolute magnitude (MV)−1.16±0.107[6]
Details
Mass2.63[7] M☉
Radius35[8] R☉
Luminosity447[7] L☉
Surface gravity (log g)1.77[6] cgs
Temperature4,490±25[7] K
Metallicity [Fe/H]−0.15[6] dex
Rotational velocity (v sin i)3.8[9] km/s
Age1.24[7] Gyr
Other designations
φ Cap, 28 Cap, BD−21°5974, HD 202320, HIP 104963, HR 8127, SAO 190173[10]
Database references
SIMBADdata

Phi Capricorni is a solitary[11] star in the southern constellation of Capricornus. Its name is a Bayer designation that is Latinized from φ Capricorni, and abbreviated Phi Cap or φ Cap. This star is visible to the naked eye with an apparent visual magnitude of +5.16.[2] Based upon an annual parallax shift of 5.07 mas as seen from the Earth,[1] the star is located approximately 670 light years from the Sun, give or take 20 light years. Because of its proximity to the ecliptic, it is subject to lunar occultation.[12]

This is an evolved, orange-hued K-type giant/bright giant star with a stellar classification of K0 II-III[4] It shows an infrared excess, which may be due to leftover material from a mass-loss event.[9] The star has an estimated 2.63 times the mass of the Sun,[7] and radiates 447 times the solar luminosity from its photosphere at an effective temperature of 4,490 K.[7] Phi Capricorni is around 1.24[7] billion years old and is spinning with a projected rotational velocity of 3.8 km/s.[9]

Chinese Name

In Chinese, 十二國 (Shíer Guó), meaning Twelve States, refers to an asterism which is represent twelve ancient states in the Spring and Autumn period and the Warring States period, consisting of φ Capricorni, ι Capricorni, 38 Capricorni, 35 Capricorni, 36 Capricorni, χ Capricorni, θ Capricorni, 30 Capricorni, 33 Capricorni, ζ Capricorni, 19 Capricorni, 26 Capricorni, 27 Capricorni, 20 Capricorni, η Capricorni and 21 Capricorni.[13] Consequently, the Chinese name for φ Capricorni itself represents the state Chu (楚),[14] together with ε Ophiuchi in Right Wall of Heavenly Market Enclosure (asterism).[15][16]

R. H. Allen had the opinion that φ Capricorni, together with χ Capricorni, represented the state Wei (魏).[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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.
  2. ↑ 2.0 2.1 2.2 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa 27: 11, Bibcode: 1968MNSSA..27...11C. 
  3. ↑ Stock, Stephan; Reffert, Sabine; Quirrenbach, Andreas (2018). "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search". Astronomy and Astrophysics 616: A33. doi:10.1051/0004-6361/201833111. Bibcode: 2018A&A...616A..33S. 
  4. ↑ 4.0 4.1 Houk, N.; Smith-Moore, M. (1988), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, 4, Bibcode: 1988mcts.book.....H. 
  5. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 6.2 Park, Sunkyung et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal 146 (4): 73, doi:10.1088/0004-6256/146/4/73, Bibcode: 2013AJ....146...73P. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L. 
  8. ↑ Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  9. ↑ 9.0 9.1 9.2 Fekel, Francis C.; Watson, Lyndon C. (November 1998), "A Search for Lithium-Rich Giants among Stars with Infrared Excesses", The Astronomical Journal 116 (5): 2466–2474, doi:10.1086/300614, Bibcode: 1998AJ....116.2466F. 
  10. ↑ "phi Cap". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=phi+Cap. 
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  12. ↑ Schmidtke, P. C.; Africano, J. L. (January 2011), "KPNO Lunar Occultation Summary. III", The Astronomical Journal 141 (1): id. 10, doi:10.1088/0004-6256/141/1/10, Bibcode: 2011AJ....141...10S. 
  13. ↑ Script error: The function "in_lang" does not exist. 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  14. ↑ Script error: The function "in_lang" does not exist. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 4 日
  15. ↑ Script error: The function "in_lang" does not exist. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 24 日
  16. ↑ 16.0 16.1 Allen, Richard Hinckley (1963), "Capricornus", Star Names, Their Lore and Meaning, Dover, https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Capricornus*.html, retrieved 2017-05-09. 



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