Celaeno (star)

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Celaeno, 16 Tau
M45map.jpg
Celaeno is found just above Electra (map right).
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 03h 44m 48.2154s[1]
Declination +24° 17′ 22.093″[1]
Apparent magnitude (V) +5.448
Characteristics
Spectral type B7IV
U−B color index –0.33[2]
B−V color index –0.046[2]
Astrometry
Radial velocity (Rv) +2.9[3] km/s
Proper motion (μ) RA: 20.73[1] mas/yr
Dec.: –44.00[1] mas/yr
Parallax (π) 7.53 ± 1.23[4] mas
Distance approx. 430 ly
(approx. 130 pc)
Details
Mass ~9 - 10 M
Radius 4.4[5] R
Surface gravity (log g) 3.9[6] cgs
Temperature 12,800[6] K
Rotational velocity (v sin i) 185[7] km/s
Other designations
16 Tauri, HR 1140, HD 23288, BD+23 505, HIP 17489, SAO 76126, GC 4475.[8]

Celaeno (Celeno or 16 Tauri) is a star in the constellation Taurus and a member of the Pleaides open cluster of stars. Celaeno has been called the "Lost Pleiad" by Theon the Younger.[9] Star gazers often only see six of the seven Pleiades sisters with the unaided eye because Celaeno, with an apparent magnitude of +5.45, requires clear, dark skies to be observed.

16 Tauri is a blue-white B-type subgiant with an apparent magnitude of +5.45. It is approximately 430 light years from Earth;[4] about the same distance as the Pleiades. The interstellar extinction of this star is fairly small at 0.05 magnitudes.[10] The projected rotational velocity of the equator is 185 km/s.[7] It is over four times the radius of the Sun and has a surface temperature of 12,800 K.[5][6]

Namesakes[edit]

USS Celeno (AK-76) was a United States Navy Crater class cargo ship named after the star.

References[edit]

  1. ^ a b c d Perryman, M. A. C. et al. (1997), "The Hipparcos Catalogue", Astronomy & Astrophysics 323: L49–L52, Bibcode:1997A&A...323L..49P 
  2. ^ a b Johnson, H. L.; Morgan, W. W. (1953). "Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas". Astrophysical Journal 117: 313–352. Bibcode:1953ApJ...117..313J. doi:10.1086/145697. 
  3. ^ Wilson, Ralph Elmer (1953). General catalogue of stellar radial velocities. Carnegie Institution of Washington. Retrieved 2007-05-14. 
  4. ^ a b Makarov, Valeri V. (December 2002). "Computing the Parallax of the Pleiades from the Hipparcos Intermediate Astrometry Data: An Alternative Approach". The Astronomical Journal 124 (6): 3299–3304. Bibcode:2002AJ....124.3299M. doi:10.1086/344683. 
  5. ^ a b Pasinetti-Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (November 2000). "Catalogue of Stellar Diameters (CADARS) (Pasinetti-Fracassini+ 2001)". VizieR On-line Data Catalog: II/224. Retrieved 2009-10-10. 
  6. ^ a b c Wolff, Sidney C. (December 1990). "Luminosities, masses, and ages of B-type stars". Astronomical Journal 100: 1994. Bibcode:1990AJ....100.1994W. doi:10.1086/115654. 
  7. ^ a b Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 11–17, 2002). "Rotational velocities of B stars". In K. S. Cheng, K. C. Leung, T. P. Li. Proceedings, Stellar astrophysics - a tribute to Helmut A. Abt. Sixth Pacific Rim Conference. Xi'an, China: Kluwer Academic Publishers. pp. 165–172. ISBN 1-4020-1683-2.  Vizier table J/ApJ/573/359.
  8. ^ "Celeno". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-10-10. 
  9. ^ Allen, Richard Hinckley (1899). Star-names and their meanings. G. E. Stechert. p. 407. Retrieved 2009-10-10. 
  10. ^ Breger, M. (August 1984). "The Pleiades cluster. I - Polarization and reddening of the brighter stars". Astronomy and Astrophysics 137 (1): 145–148. Bibcode:1984A&A...137..145B.