WISE J0521+1025

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Coordinates: Sky map 05h 21m 26.349s, +10° 25′ 27.41″

WISE J0521+1025
Observation data
Epoch 2012.773[1]      Equinox J2000
Constellation Orion
Right ascension 05h 21m 26.349s[1]
Declination 10° 25′ 27.41″[1]
Spectral type T7.5[1]
Apparent magnitude (J (2MASS)) 15.262[1]
Apparent magnitude (H (2MASS)) 15.222 ± 0.103[1]
Apparent magnitude (Ks (2MASS)) 14.665[1]
Apparent magnitude (w1 (WISE)) 14.098 ± 0.031[1]
Apparent magnitude (w2 (WISE)) 12.286 ± 0.026[1]
Apparent magnitude (w3 (WISE)) 10.306 ± 0.085[1]
Proper motion (μ) RA: +232 ± 9[1] mas/yr
Dec.: -418 ± 6[1] mas/yr
Distance 16.3 ± 4.2[1] ly
(5.0 ± 1.3[1] pc)
Other designations
WISE J052126.29+102528.4[1]
WISE J0521+1025[1]
Database references

WISE J0521+1025 is a nearby brown dwarf of spectral type T7.5, located in constellation Orion [~ 1] at approximately 5.0 pc (16.3 ly) from Earth.[1]

It is also the nearest known T dwarf in the northern sky.[1]

History of observations[edit]

WISE J0521+1025 was discovered by Bihain et al. by selection of sources with colours typical for T dwarfs from WISE All-Sky source catalogue and checking them for high proper motion using older surveys: 2MASS, DENIS, SDSS, SSS, DSS and UKIDSS. Three objects among about ten candidates, including WISE J0521+1025, were selected for spectroscopic follow up with Large Binocular Telescope (LBT). October 9, 2012 Bihain et al. carried out follow up observations of WISE J0521+1025 with near-Infrared spectrograph LUCI 1 on LBT. June 25, 2013 Astronomy & Astrophysics received the discovery paper, which was accepted for publication 10 July 2013.[1]


Distance of WISE J0521+1025 was estimated by Bihain et al. using mean absolute magnitudes of single T7.5 dwarfs, derived by Dupuy & Liu (2012) from trigonometric parallaxes:[2] 5.0 ± 1.3 pc (16.3 ± 4.2 ly).[1]

See also[edit]

Two other T dwarfs, announced in Bihain et al (2013):


  1. ^ It is the nearest known star/brown dwarf in this constellation.


  1. ^ a b c d e f g h i j k l m n o p q r s t Bihain, Gabriel; Scholz, Ralf-Dieter; Storm, Jesper; Schnurr, Olivier (2013). "An overlooked brown dwarf neighbour (T7.5 at d~5pc) of the Sun and two additional T dwarfs at about 10pc". arXiv:1307.2722Freely accessible. 
  2. ^ Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". The Astrophysical Journal Supplement. 201 (2): 19. arXiv:1201.2465Freely accessible. Bibcode:2012ApJS..201...19D. doi:10.1088/0067-0049/201/2/19.