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 Pleiades open cluster of stars. Celaeno has been called the "Lost Pleiad" by Theon the Younger.[9]

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

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

References

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