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Luhman 16

Luhman 16
Luhman 16
WISE image of Luhman 16. In the GMOS image in the inset, it is resolved into a pair.
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Vela
Right ascension 10h 49m 18.771s[2]
Declination −53° 19′ 09.8779″[2]
Apparent magnitude (V) 16.20[3]
Characteristics
Spectral type A: L7.5[4]
B: T0.5 ± 1[4]
Apparent magnitude (i (DENIS filter system)) 14.94±0.03[5]
Apparent magnitude (J (2MASS filter system)) 10.73±0.03[5]
Apparent magnitude (J (DENIS filter system)) 10.68±0.05[5]
Apparent magnitude (H (2MASS filter system)) 9.56±0.03[5]
Apparent magnitude (KS (2MASS filter system)) 8.84±0.02[5]
Apparent magnitude (KS (DENIS filter system)) 8.87±0.08[5]
Astrometry
Proper motion (μ) RA: −2768.511+0.056
−0.030 mas/yr[2]
Dec.: 358.472+0.027
−0.047 mas/yr[2]
Parallax (π)500.993 ± 0.050 mas[2]
Distance6.5102 ± 0.0006 ly
(1.9960 ± 0.0002 pc)
Orbit[2]
Period (P)26.55±0.08 yr
Semi-major axis (a)3.52 AU
Eccentricity (e)0.344±0.001
Inclination (i)79.92±0.008°
Longitude of the node (Ω)130.02±0.01°
Periastron epoch (T)2018.060±0.003
Argument of periastron (ω)
(secondary)		136.67±0.09°
Details[6][7][8]
Luhman 16A
Mass0.034 M☉
Mass35.4±0.2[2] MJup
Radius~0.85[note 1] RJup
Luminosity0.0000219[8] L☉
Temperature1350 K
Rotation6.94 hours[9]
Luhman 16B
Mass0.028 M☉
Mass29.4±0.2[2] MJup
Radius~1.04[note 1] RJup
Luminosity0.0000209[8] L☉
Temperature1210 K
Rotation5.28 hours[9]
Position (relative to A)[5]
ComponentB
Angular distance1.5″
Projected separation3 AU
Other designations
LUH 16,[1] Luhman–WISE 1,[1] WISE J104915.57−531906.1,[5] DENIS-P J104919.0−531910,[10] 2MASS J10491891−5319100,[10] IRAS Z10473-5303,[1] AKARI J1049166−531907,[1] GSC2.2 S11132026703,[1] GSC2.3 S4BM006703,[1] TIC 119862115,[10] GJ 11551[11]
Database references
SIMBADThe system
A
B
Luhman 16 is located in the constellation Vela.
Luhman 16 is located in the constellation Vela.
   Luhman 16
Location of Luhman 16 in the constellation Vela

Luhman 16 (also designated WISE 1049−5319 or WISE J104915.57−531906.1) is a binary brown-dwarf system in the southern constellation Vela at a distance of 6.51 light-years (2.00 parsecs) 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,[12][13] 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).[14] The masses of Luhman 16 A and B are 35.4 and 29.4 Jupiter masses, respectively, and their ages are estimated to be 400–800 million years.[2] Luhman 16 A and B orbit each other at a distance of about 3.5 astronomical units[5] with an orbital period of approximately 26.6 years.[2]

  1. ^ a b c d e f g h Cite error: The named reference Mamajek2013 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Bedin2024 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference ucac4 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Burgasser2013 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h i Cite error: The named reference Luhman2013 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Boffin2014 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Kniazev2013 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Garcia2017 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Apai2021 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference simbad was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference CNS5 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference PennState was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Plait was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Sahlmann2015 was invoked but never defined (see the help page).


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