Luhman 16
.png) The Luhman 16 binary brown dwarf is the yellow disc at the center of this 7 January 2010 WISE image. The individual brown dwarfs are not resolved. |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Vela |
| Right ascension | 10h 49m 18.723s |
| Declination | −53° 19′ 09.86″ |
| Characteristics | |
| Spectral type | A: L7.5 B: T0.5 ± 1 |
| Apparent magnitude (i (DENIS filter system)) | 14.94±0.03 |
| Apparent magnitude (J (2MASS filter system)) | 10.73±0.03 |
| Apparent magnitude (J (DENIS filter system)) | 10.68±0.05 |
| Apparent magnitude (H (2MASS filter system)) | 9.56±0.03 |
| Apparent magnitude (KS(2MASS filter system)) | 8.84±0.02 |
| Apparent magnitude (KS(DENIS filter system)) | 8.87±0.08 |
| Astrometry | |
| Proper motion (μ) |
RA: −2754.77±0.09 mas/yr Dec.: 358.72±0.09 mas/yr |
| Parallax (π) | 500.51 ± 0.11mas |
| Distance | 6.516 ± 0.001 ly (1.9980 ± 0.0004 pc) |
| Orbit | |
| Period (P) | ~45 yr |
| Eccentricity (e) | 0 |
| Inclination (i) | 95° |
| Details | |
| Luhman 16A | |
| Mass | 0.04–0.05 M☉ |
| Temperature | 1350 K |
| Luhman 16B | |
| Mass | 0.03–0.05 M☉ |
| Temperature | 1210 K |
| Position (relative to A) | |
| Component | B |
| Angular distance | 1.5″ |
|
Observed separation (projected) |
3 AU |
| Other designations | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
Coordinates: 
10h 49m 18.723s, −53° 19′ 09.86″
Luhman 16 (WISE 1049−5319, WISE J104915.57−531906.1) is a binary brown-dwarf system in the southern constellation Vela at a distance of approximately 6.5 light-years (2.0 pc) from the Sun. These are the closest known brown dwarfs and the closest system found since the measurement of the proper motion of Barnard's Star in 1916, and the third-closest known system to the Sun (after the Alpha Centauri system and Barnard's Star). The primary is of spectral type L7.5 and the secondary of type T0.5 ± 1 (and is hence near the L–T transition). Luhman 16 A and B orbit each other at a distance of about 3 AU with an orbital period of approximately 25 years.
The brown dwarfs were discovered by Kevin Luhman, astronomer from Pennsylvania State University and a researcher in Penn State's Center for Exoplanets and Habitable Worlds, from images made by the Wide-field Infrared Survey Explorer(WISE) Earth-orbiting satellite—NASA infrared-wavelength 40 cm (16 in) space telescope, a mission that lasted from December 2009 to February 2011; the discovery images were taken from January 2010 to January 2011, and the discovery was announced in 2013 (the pair are the only two objects announced in the discovery paper). The system was found by comparing WISE images at different epochs to reveal objects that have high proper motions.
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