WISE 1800+0134

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Coordinates: Sky map 18h 00m 26.60s, +01° 34′ 53.1″

WISEP J180026.60+013453.1
Observation data
Epoch 2010.22[1]      Equinox J2000[1]
Constellation Ophiuchus
Right ascension  18h 00m 26.60s[1]
Declination 01° 34′ 53.1″[1]
Spectral type L7.5[1]
Apparent magnitude (J (2MASS filter system)) 14.30 ± 0.04[1]
Apparent magnitude (H (2MASS filter system)) 13.12 ± 0.04[1]
Apparent magnitude (KS (2MASS filter system)) 12.42 ± 0.03[1]
Proper motion (μ) RA: 220 ± 20[1] mas/yr
Dec.: −360 ± 20[1] mas/yr
Parallax (π)124.89 ± 3.24[2] mas
Distance26.1 ± 0.7 ly
(8.0 ± 0.2 pc)
Mass0.04–0.074 M
Luminosity10−4.5 ± 0.3 L
Temperature1430 ± 100 K
Other designations
WISEP J180026.60+013453.1[1]
2MASS J18002648+0134565[1]
DENIS J180026.4+013457[1]
DENIS-P J180026.4+013457[3]
Database references
WISE 1800+0134 is located in 100x100
WISE 1800+0134

WISEP J180026.60+013453.1 (designation is abbreviated to W1800+0134[1]) is a brown dwarf of spectral class L7.5,[1] located in constellation Ophiuchus at approximately 29 light-years from Earth.[1]


WISEP J180026.60+013453.1 was discovered in 2011 by Gizis et al. from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satelliteNASA infrared-wavelength 40 centimetres (16 in)) space telescope, which mission lasted from December 2009 to February 2011. There are also precovery identifications of this object in Two Micron All-Sky Survey (2MASS) data (observed on 2000 September 23) and in the 3rd release of the DENIS database (close in time to the 2MASS observation).[1] On 2011 June 22 Gizis et al. had conducted near-infrared spectroscopy with SpeX spectrograph, mounted on the 3 m Infrared Telescope Facility (IRTF), located at the Mauna Kea Observatory in Hawaii.[1] In 2011 Gizis et al. published a paper in The Astronomical Journal, where they presented discovery of a newfound by WISE L-type brown dwarf WISEP J180026.60+013453.1 (a single discovery, presented in the article).[1]

Physical properties[edit]

WISEP J180026.60+013453.1 has temperature 1430 ± 100 K and luminosity 10−4.5 ± 0.3 Solar luminosities (the estimates are based on the object's spectral class (L7.5)).[1] Mass estimates, determined from this temperature, are 0.04,[note 1] 0.05,[note 2] and 0.074[note 3] Solar masses, anyway below the hydrogen-burning limit, which implies that WISEP J180026.60+013453.1 is not a true star, but only a substellar object, that is a brown dwarf.[1]

Failed test for binarity[edit]

WISEP J180026.60+013453.1 was tested spectroscopically for L + T binarity, and the binarity was not revealed.[1] Common proper motion companions also were not found.[1]

See also[edit]


  1. ^ For an assumed age 0.5 Gyr.
  2. ^ For an assumed age 1 Gyr.
  3. ^ For an assumed age 5 Gyr.


  1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y Gizis, John E.; Burgasser, Adam J.; Faherty, Jacqueline K.; Castro, Philip J.; Shara, Michael M. (2011). "WISEP J180026.60+013453.1: A nearby late-L Dwarf near the Galactic Plane". The Astronomical Journal. 142 (5): 171. arXiv:1109.0054. Bibcode:2011AJ....142..171G. doi:10.1088/0004-6256/142/5/171.
  2. ^ Gizis, John E.; et al. (2015). "Properties of the Nearby Brown Dwarf WISEP J180026.60+013453.1". The Astronomical Journal. 150 (6). 179. arXiv:1509.04690. Bibcode:2015AJ....150..179G. doi:10.1088/0004-6256/150/6/179.
  3. ^ "2MASS J18002648+0134565 -- Infrared source". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-12-24.