WD 0806−661 B
WD 0806-661 B, also formally named Ahra, is a planetary-mass companion of the white dwarf star WD 0806−661, or Maru.
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 | |
Mean radius | 1.12 RJ |
| Mass | 7-9 MJ |
| 16.17 g (Estimate) | |
| Temperature | 325-350 K |
This object was discovered in 2011 by the Spitzer Space Telescope. It has a mass of between 7-9 MJ, putting it in between the sizes of a gas giant planet and a brown dwarf. 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.
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