WISE J0457-0207

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Coordinates: Sky map 04h 57m 46.114s, −02° 07′ 19.59″

WISE J0457-0207
Observation data
Epoch 2012.770[1]      Equinox J2000
Constellation Orion
Right ascension 04h 57m 46.114s[1]
Declination −02° 07′ 19.59″[1]
Characteristics
Spectral type T2[1]
Apparent magnitude (J (2MASS)) 14.897 ± 0.040[1]
Apparent magnitude (H (2MASS)) 14.198 ± 0.046[1]
Apparent magnitude (H (UKIDSS)) 14.190 ± 0.003[1]
Apparent magnitude (Ks (2MASS)) 14.022 ± 0.055[1]
Apparent magnitude (K (UKIDSS)) 13.975 ± 0.003[1]
Apparent magnitude (w1 (WISE)) 13.391 ± 0.026[1]
Apparent magnitude (w2 (WISE)) 12.443 ± 0.025[1]
Apparent magnitude (w3 (WISE)) 11.020 ± 0.114[1]
Astrometry
Proper motion (μ) RA: 82 ± 9[1] mas/yr
Dec.: -97 ± 8[1] mas/yr
Distance 40.8 ± 10.1[1] ly
(12.5 ± 3.1[1] pc)
Other designations
WISE J045746.08-020719.2[1]
WISE J0457-0207[1]

WISE J0457-0207 is a nearby brown dwarf of spectral type T2, located in constellation Orion at approximately 12.5 pc (40.8 ly) from Earth.[1]

History of observations[edit]

WISE J0457-0207 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 J0457-0207, were selected for spectroscopic follow up with Large Binocular Telescope (LBT). October 8, 2012 Bihain et al. carried out follow up observations of WISE J0457-0207 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[edit]

Distance of WISE J0457-0207 was estimated by Bihain et al. using mean absolute magnitudes of single T1/T2 dwarfs, derived by Dupuy & Liu (2012) from trigonometric parallaxes:[2] 12.5 ± 3.1 pc (40.8 ± 10.1 ly).[1]

WISE J0457-0207 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Bihain et al. (2013) 12.5 ± 3.1 40.8 ± 10.1 [1]

Non-trigonometric estimates are marked in italic. The best estimate is marked in bold.

See also[edit]

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

References[edit]

  1. ^ a b c d e f g h i j k l m n o p q r s t u v Bihain, Gabriel; Ralf-Dieter Scholz, Jesper Storm, Olivier Schnurr (2013). "An overlooked brown dwarf neighbour (T7.5 at d~5pc) of the Sun and two additional T dwarfs at about 10pc". arXiv:1307.2722. Bibcode 2013arXiv1307.2722B.
  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:1201.2465. Bibcode:2012ApJS..201...19D. doi:10.1088/0067-0049/201/2/19.  edit