HL Tauri
Star in constellation Taurus / From Wikipedia, the free encyclopedia
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HL Tauri (abbreviated HL Tau) is a young T Tauri star[5] in the constellation Taurus, approximately 450 light-years (140 pc) from Earth[1] in the Taurus Molecular Cloud.[6] The luminosity and effective temperature of HL Tauri imply that its age is less than 100,000 years.[7] At apparent magnitude 15.1,[3] it is too faint to be seen with the unaided eye. It is surrounded by a protoplanetary disk marked by dark bands visible in submillimeter radiation that may indicate a number of planets in the process of formation.[2] It is accompanied by the Herbig–Haro object HH 150, a jet of gas emitted along the rotational axis of the disk that is colliding with nearby interstellar dust and gas.[8]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Taurus |
Right ascension | 04h 31m 38.437s[3] |
Declination | +18° 13′ 57.65″[3] |
Characteristics | |
Evolutionary stage | Pre-main-sequence star |
Spectral type | Class K9 |
Apparent magnitude (V) | 15.1 |
B−V color index | 0.92 |
V−R color index | 0.89 |
J−H color index | 1.45 |
J−K color index | 3.21 |
Variable type | T Tauri |
Astrometry | |
Proper motion (μ) | RA: +8.0±6.0[4] mas/yr Dec.: -21.8±5.8[4] mas/yr |
Distance | 450[1] ly (140 pc) |
Database references | |
SIMBAD | data |