WISEA J1141−3326
From Wikipedia, the free encyclopedia
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 41m 57.47s |
| Declination | −33° 26′ 34.57″ |
| Characteristics | |
| Evolutionary stage | sub-brown dwarf |
| Spectral type | Y0[1] |
| Astrometry | |
| Proper motion (μ) | RA: -910.9 ±1.9 mas/yr[2] Dec.: -76.4 ±1.8 mas/yr[2] |
| Parallax (π) | 104.0±2.9 mas[2] |
| Distance | 31.4 ± 0.9 ly (9.6 ± 0.3 pc) |
| Details[1] | |
| Mass | 3–8 MJup |
| Surface gravity (log g) | 3.75–4.25 cgs |
| Temperature | 460±79[2] K |
| Age | 0.1–1.0 Gyr |
| Other designations | |
| CNS5 2863, WISEA J114156.67-332635.5, WISE J114156.71-332635.8 | |
| Database references | |
| SIMBAD | data |
WISEA J1141−3326 (WISE J114156.67-332635.5, W1141) is a Y-dwarf, which means it is one of the coldest directly imaged astronomical objects.[3] It is likely a free-floating planetary-mass object.[1]
W1141 was discovered in 2014 from data of the Wide-field Infrared Survey Explorer and at first the spectral type was estimated to be Y0, but no spectroscopic confirmation was present at the time.[3] In 2017 a spectrum from Gemini South was published, confirming it as a Y0 spectral type. This work found it to be metal-rich, between 100 Myrs and 1 Gyr young and low-mass (3–8 MJ). It has a tangential velocity of about 41 km/s.[1] It was found that this object overlapped with a background galaxy in early observations, which contaminated its apparent brightness and led to the false conclusion of a blue color.[4]