Mu Capricorni

Mu Capricorni
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Capricornus
Right ascension 21h 53m 17.770s[1]
Declination −13° 33′ 06.37″[1]
Apparent magnitude (V) +5.081[2]
Characteristics
Evolutionary stage main sequence
Spectral type F2 V[3]
U−B color index +0.012[2]
B−V color index +0.367[2]
Astrometry
Radial velocity (Rv)−21.5[4] km/s
Proper motion (μ) RA: +310.526 mas/yr[1]
Dec.: +12.627 mas/yr[1]
Parallax (π)37.3377±0.1107 mas[1]
Distance87.4 ± 0.3 ly
(26.78 ± 0.08 pc)
Absolute magnitude (MV)+2.96±0.04[5]
Details
Mass1.437±0.04[1] M☉
Radius1.722±0.035[1] R☉
Luminosity5.56±0.04[1] L☉
Surface gravity (log g)4.077+0.028
−0.005[1] cgs
Temperature6,755+2
−5[1] K
Metallicity [Fe/H]−0.14[5] dex
Rotational velocity (v sin i)69.3±3.5[6] km/s
Age1.80±0.34[1] Gyr
Other designations
μ Cap, 51 Cap, BD−14°6149, FK5 1577, GJ 838.5, GJ 9761, HD 207958, HIP 108036, HR 8351, SAO 164713[7]
Database references
SIMBADdata

Mu Capricorni is a solitary,[8] yellow-white hued star in the southern constellation of Capricornus. Its name is a Bayer designation that is Latinized from μ Capricorni, and abbreviated Mu Cap or μ Cap. The star is visible to the naked eye with an apparent visual magnitude of +5.08.[2] Based upon an annual parallax shift of 37.57 mas as seen from the Earth,[1] the star is located at a distance of 87.4 light-years (26.8 pc) from the Sun. It is drifting closer with a line of sight velocity of −21.5 km/s.[4] The proximity of this star to the ecliptic means it is subject to lunar occultation.[9]

This is an ordinary F-type main sequence star with a stellar classification of F2 V,[3] which indicates it is generating energy through hydrogen thermonuclear fusion at its core. It is an estimated 1.8[1] billion years old and is spinning with a projected rotational velocity of 69 km/s.[6] The star has 1.44 times the mass of the Sun and 1.72 times the Sun's radius.[1] It is radiating 5.56 times the luminosity of the Sun from its photosphere at an effective temperature of 6,755 K.[1]

In Chinese, 哭 (Kū), meaning Crying, refers to an asterism consisting of μ Capricorni and 38 Aquarii.[10] Consequently, the Chinese name for μ Capricorni itself is 哭一 (Kū yī, English: the First Star of Crying.).[11] From this Chinese name, the name Kuh has appeared.[12]

References

  1. ^ a b c d e f g h i j k l m n Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d Gutierrez-Moreno, A.; et al. (1966), "A system of photometric standards", Publicaciones Departamento de Astronomia, Universidad de Chile, 1: 1, Bibcode:1966PDAUC...1....1G.
  3. ^ a b Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
  4. ^ a b Wilson, Ralph Elmer (1953), General catalogue of stellar radial velocities, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W
  5. ^ a b Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
  6. ^ a b Reiners, Ansgar (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911, S2CID 8642707
  7. ^ "mu. Cap", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-05-13.
  8. ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  9. ^ Evans, D. S.; Edwards, D. A. (August 1981), "Photoelectric observations of lunar occultations. XII", Astronomical Journal, 86: 1277–1287, Bibcode:1981AJ.....86.1277E, doi:10.1086/113008.
  10. ^ (in Chinese) 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.
  11. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 5 日 Archived 2011-05-21 at the Wayback Machine
  12. ^ Allen, Richard Hinckley (1963), "Capricornus", Star Names, Their Lore and Meaning, Dover, retrieved 2017-05-09.
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