119 Tauri

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119 Tauri
119 Tauri(english)new.png
The sky position of 119 Tauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 05h32m12.753s
Declination +18°35′39.24″
Apparent magnitude (V) +423-4.54[1]
Characteristics
Spectral type M2Iab-Ib
U−B color index +2.21
B−V color index +2.07
Variable type SRc
Astrometry
Radial velocity (Rv) +23.75 km/s
Proper motion (μ) RA: 1.86 mas/yr
Dec.: −4.48 mas/yr
Parallax (π) 1.82 ± 0.26 mas
Distance 1,802 ly
(549 pc)
Absolute magnitude (MV) −4.477
Details
Mass 8.0[1] M
Radius 601[1] R
Luminosity 43,000[1] L
Surface gravity (log g) -0.21[1] cgs
Temperature 3,400[1] K
Metallicity 0.0[1]
Other designations
CE Tauri, HR 1845, HD 36389, BD+18°875, HIP 25945, SAO 94628, GC 6841
Database references
SIMBAD data

119 Tauri is a star in the constellation Taurus. It is one of the largest stars known, having a diameter about 600 times that of the Sun. Because it is near the ecliptic, CE Tau is periodically occulted by the moon and its angular diameter can be measured very accurately.[2] It is also close enough that its distance can be determined accurately by parallax and so the actual diameter can be determined directly.

119 Tauri is a M-type red supergiant with a mean apparent magnitude of +4.32. It is approximately 1,800 light years from Earth. The star is classified as a semiregular variable star and its brightness varies from magnitude +4.23 to +4.54 with a period of 165 days.[3] With a colour index of +2.07, this star has been identified as the second reddest in the night sky to shine consistently at a naked eye brightness well above the 5th magnitude.[4] Down to a limiting magnitude of +5, it is superseded in redness only by the Garnet Star (Mu Cephei). 119 Tauri lies 4.6 degrees off the ecliptic. This makes it a candidate for occultations by the Moon and (extremely rarely) by one of the bright planets. The star's angular diameter and a linear radius of 450 Solar radii have been measured in three colors by lunar occultation.[5]

See also[edit]

Notes[edit]

  1. ^ a b c d e f g Cruzalèbes, P.; Jorissen, A.; Rabbia, Y.; Sacuto, S.; Chiavassa, A.; Pasquato, E.; Plez, B.; Eriksson, K. et al. (2013). "Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER". arXiv:1306.3288v1 [astro-ph.SR].
  2. ^ Wasatonic, R. & Guinan, E. F. (1998). "Variations of Luminosity, Radius, and Temperature of the Pulsating Red Supergiant CE Tauri". Information Bulletin on Variable Stars 4629: 1. Bibcode:1998IBVS.4629....1W. 
  3. ^ 119 Tau (119 Tauri=CE Tauri) – Written by Jim Kaler
  4. ^ "Realm of the majestic ruby star in Taurus" by A. Ahad, October 19, 2004.
  5. ^ White, N. M. (1980). "The occultation of 119 Tauri and the effective temperatures of three M supergiants". The Astrophysical Journal 242: 646. Bibcode:1980ApJ...242..646W. doi:10.1086/158501.