W Hydrae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | Template:RA |
| Declination | Template:DEC |
| Apparent magnitude (V) | 7.7 - 11.6[2] |
| Characteristics | |
| Spectral type | M7.5e-M9ep[3] |
| Apparent magnitude (J) | -1.7[4] |
| Variable type | Mira |
| Astrometry | |
| Parallax (π) | 10.18±2.36 mas[5] |
| Distance | Script error: No such module "val". ly (Script error: No such module "val". pc)[5] |
| Details | |
| Mass | Script error: No such module "val".[6] Template:Solar mass |
| Radius | Template:Solar radius calculatorScript error: No such module "Su".[7]Template:Efn Template:Solar radius |
| Luminosity | Script error: No such module "val".[6] Template:Solar luminosity |
| Temperature | 3,000[6] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| W Hya, CCDM J13491-2822A, HD 120285, RAFGL 1650, CPD-27° 4792, HIP 67419, SAO 181981, AAVSO 1343-27, IRAS 13462-2807, GC 18659, TYC 6728-19-1. | |
| Database references | |
| SIMBAD | data |
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W Hydrae is a Mira-type variable star in the constellation Hydra. The star is nearly located within the Solar neighborhood, at 320 light years from the Solar System. It has a visual apparent magnitude range of 5.6 to 10. In the near-infrared J band it has a magnitude of -1.7,[4] is the 7th brightest star in the night sky, and is even brighter than Sirius.
Water and dust masers
The star also shows signs of intense water emissions, indicative of the presence of a wide disk of dust and water vapour.[8] Such emissions cover a zone spanning between 10.7 Astronomical Units (within Saturn's orbital zone) and 1.2 parsecs (or nearly 247,500 Astronomical Units, as far away as the Oort Cloud in Solar System).
Notes
References
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External links
- AAVSO Variable Star of the Month. April 2008: W Hya
- W HyaScript error: No such module "Unsubst". at AAVSO (chart #8585EPX)
