| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Monoceros |
| Right ascension | 07h 22m 27.29s[1] |
| Declination | -05° 40′ 30.0″[1] |
| Characteristics | |
| Spectral type | T9[2] |
| Astrometry | |
| Parallax (π) | 246 ± 33[1] mas |
| Distance | approx. 13 ly (approx. 4.1 pc) |
| Details | |
| Mass | 0.005–0.038[1] M☉ |
| Radius | 0.085–0.12[1] R☉ |
| Luminosity (bolometric) | 9.8×10−7[1] L☉ |
| Temperature | 480-560[1] K |
| Age | (assumed) 0.2–10 billion[1] years |
| Other designations | |
|
WISEPA J072227.27-054029.9[3]
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| Database references | |
| SIMBAD | data |
UGPS J072227.51-054031.2 (designation often abbreviated to UGPS 0722-05) is a brown dwarf of late T type, located approximately 4.1 parsecs (13 light-years) from Earth.[1] The astronomical object was discovered by Philip Lucas at the University of Hertfordshire and announced in 2010. The discovery image was taken on 28 November 2006 by the UKIRT Infrared Deep Sky Survey (UKIDSS) with a recovery image confirming the object's proper motion on 2 March 2010.[1] The reported distance is derived from the current measured parallax of 246 milliarcseconds. The object was initially reported to be at an even closer distance of 2.9 parsecs, which would have placed it among the ten nearest stars to the Sun[4] but later measurements revealed that the object was in fact located at a greater distance than initially thought, at 4.1+0.6
−0.5 parsecs.[1]
The object is roughly the volume of Jupiter, but is estimated to have 5-40 Jupiter masses (MJ).[1] This would make it less massive than ε Indi Ba. Sub-brown dwarfs have a mass of less than about 13 Jupiter masses. Infrared spectra shows the object contains water vapor and methane and has a surface temperature of approximately 480–560 Kelvin.[1]
Ken Croswell in the New Scientist describes UGPS 0722-05 as a "dark sun" for any hypothetical observers, orbiting around such a cool brown dwarf, in their "daytime" sky.[5]
Coordinates: 07h 22m 27.29s, −05° 40′ 30.0″
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