Mu Capricorni

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

Mu Capricorni is a solitary, 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. Based upon an annual parallax shift of 37.57 mas as seen from the Earth, 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. The proximity of this star to the ecliptic means it is subject to lunar occultation.

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

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

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 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. 1 2 3 4 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. 1 2 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. 1 2 Wilson, Ralph Elmer (1953), General catalogue of stellar radial velocities, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W
  5. 1 2 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. 1 2 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.