WD 0806−661 B
JWST image of WD 0806−661 B and its white dwarf star | |
| Discovery | |
|---|---|
| Discovered by | Luhman et al. |
| Discovery date | 2011 |
| Direct imaging | |
| Designations | |
| Ahra, GJ 3483 B | |
| Orbital characteristics | |
| 2,500 AU | |
| Star | WD 0806−661 |
| Physical characteristics | |
| 1.17±0.07 RJ | |
| Mass | 7–9 MJ |
| 4.2–4.3 cgs | |
| Temperature | 325-350 K |
| Atmosphere | |
| Composition by volume | H2, He dominated, detected: H2O, NH3, CH4 |
WD 0806-661 B, formally named Ahra, is a planetary-mass companion of the white dwarf star WD 0806−661, or Maru.
This object was discovered in 2011 by the Spitzer Space Telescope. It has a mass of between 7-9 MJ, putting it as a gas giant planet. At the time of its discovery, WD 0806-661 b was the coldest brown dwarf ever discovered, with a temperature of 325-350 Kelvin (52-77 °C or 125-170 °F) and also had the largest separation from its star at about 2,500 AU at the time of its discovery. The photometric colors of the object suggest it is metal-poor.
As of 2021, WD 0806-661 b is a potential target for study from the James Webb Space Telescope.