HL Tauri
HL Tauri (abbreviated HL Tau) is a young T Tauri star in the constellation Taurus, approximately 450 light-years (140 pc) from Earth in the Taurus Molecular Cloud. The luminosity and effective temperature of HL Tauri imply that its age is less than 100,000 years. At apparent magnitude 15.1, 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. 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.
Atacama Large Millimeter Array image of HL Tauri | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 31m 38.437s |
| Declination | +18° 13′ 57.65″ |
| 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 mas/yr Dec.: -21.8±5.8 mas/yr |
| Distance | 450 ly (140 pc) |
| Database references | |
| SIMBAD | data |
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