T Tauri
Star in constellation Taurus / From Wikipedia, the free encyclopedia
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This article is about the particular star. For the class of variable stars, see T Tauri stars.
Not to be confused with Tau Tauri or Theta Tauri.
T Tauri is a variable star in the constellation Taurus, the prototype of the T Tauri stars. It was discovered in October 1852 by John Russell Hind. T Tauri appears from Earth amongst the Hyades cluster, not far from ε Tauri, but it is actually 420 light-years behind it and not a member of the cluster. The cloud to the west of the system is NGC 1555, known more commonly as Hind's Variable Nebula.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Taurus |
Right ascension | 04h 21m 59.43445s[1] |
Declination | +19° 32′ 06.4182″[1] |
Apparent magnitude (V) | 10.27[2] |
Characteristics | |
Spectral type | G5V:e |
U−B color index | +0.80[2] |
B−V color index | +1.22[2] |
Variable type | T Tauri |
Astrometry | |
Radial velocity (Rv) | +24.6[3] km/s |
Proper motion (μ) | RA: +15.51[1] mas/yr Dec.: -13.67[1] mas/yr |
Parallax (π) | 6.9290 ± 0.0583 mas[4] |
Distance | 471 ± 4 ly (144 ± 1 pc) |
Orbit[5] | |
Primary | T Tau N |
Companion | T Tau S |
Period (P) | 4200+5000 −3400 yr |
Semi-major axis (a) | 2.9+5.4 −1.7″ |
Eccentricity (e) | 0.7+0.2 −0.4 |
Inclination (i) | 52+4 −5° |
Longitude of the node (Ω) | 156 ± 11° |
Periastron epoch (T) | B 1967+25 −47 |
Argument of periastron (ω) (secondary) | 48+34 −25° |
Orbit[5] | |
Primary | T Tau Sa |
Companion | T Tau Sb |
Period (P) | 27 ± 2 yr |
Semi-major axis (a) | 85+4 −2 mas |
Eccentricity (e) | 0.56+0.07 −0.09 |
Inclination (i) | 20+10 −6° |
Longitude of the node (Ω) | 92+26 −36° |
Periastron epoch (T) | JD 2450131+208 −288 (1996 Feb 17) |
Argument of periastron (ω) (secondary) | 48+34 −25° |
Details | |
T Tau Sa | |
Mass | 2.12 ± 0.10[5] M☉ |
Age | 0.4[6] Myr |
T Tau Sb | |
Mass | 0.53 ± 0.06[5] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
Close
Although this system is considered to be the prototype of T Tauri stars, a later phase in a protostar's formation, it is a very atypical T Tauri star.[7]