Back TW Hydrae AST TW de l'Hidra Femella Catalan TW Hydrae German TW Hydrae Spanish تیدبلیو مار باریک Persian TW Hydrae Finnish TW Hydrae French TW Hydrae ID TW Hydrae Italian うみへび座TW星 Japanese
 Inner region of TW Hydrae protoplanetary disc Credit: S. Andrews, B. Saxton, ALMA (see description) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 01m 51.9054s[1] |
| Declination | −34° 42′ 17.0316″[1]> |
| Apparent magnitude (V) | 11.27 ± 0.09[2] |
| Characteristics | |
| Evolutionary stage | Pre-main-sequence |
| Spectral type | K6[2] |
| U−B color index | -0.33[3] |
| B−V color index | 0.67[2] |
| J−H color index | 0.659[2] |
| J−K color index | 0.92[2] |
| Variable type | T Tauri |
| Astrometry | |
| Radial velocity (Rv) | 13.40 ± 0.8[2] km/s |
| Proper motion (μ) | RA: −68.389 ± 0.054[1] mas/yr Dec.: −14.016 ± 0.059[1] mas/yr |
| Parallax (π) | 16.6428 ± 0.0416 mas[1] |
| Distance | 196.0 ± 0.5 ly (60.1 ± 0.2 pc) |
| Details | |
| Mass | 0.8[4] M☉ |
| Radius | 1.11[5] R☉ |
| Luminosity (bolometric) | 0.28[note 1] L☉ |
| Temperature | 4,000[5] K |
| Age | 8[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
TW Hydrae is a T Tauri star approximately 196 light-years away[1] in the constellation of Hydra (the Sea Serpent). TW Hydrae is about 80% of the mass of the Sun, but is only about 5-10 million years old. The star appears to be accreting from a face-on protoplanetary disk of dust and gas, which has been resolved in images from the ALMA observatory. TW Hydrae is accompanied by about twenty other low-mass stars with similar ages and spatial motions, comprising the "TW Hydrae association" or TWA, one of the closest regions of recent "fossil" star-formation to the Sun.
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