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
Distance 28.7 ± 3.3[1] ly
(8.8 ± 1.0[1] pc)
Mass 0.04—0.074 M
Luminosity 10−4.5 ± 0.3 L
Temperature 1430 ± 100 K
Other designations
WISEP J180026.60+013453.1[1]
2MASS J18002648+0134565[1]
DENIS J180026.4+013457[1]
DENIS-P J180026.4+013457[2]
Database references

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 cm (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 Hawai'i.[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]


Trigonometric parallax of WISEP J180026.60+013453.1 is not yet measured. Therefore, there are only distance estimates of this object, obtained by indirect — spectrophotometric — means (see table).

WISEP J180026.60+013453.1 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Gizis et al. (2011) 8.8 ± 1.0 28.7 ± 3.3 [1]

Non-trigonometric distance estimates are marked in italic.

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]

L-type brown dwarfs, presented in Kirkpatrick et al. (2011):[3]

L-type brown dwarf, presented in Castro & Gizis (2012):[4]

L-type brown dwarf, presented in Gizis et al. (2012):[5]

M-type brown dwarf, presented in Kirkpatrick et al. (2011):[3]


  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 z aa ab 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.  edit
  2. ^ "2MASS J18002648+0134565 -- Infra-Red source". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-12-24. 
  3. ^ a b Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Mainzer, A.; Eisenhardt, Peter R.; McLean, Ian S.; Thompson, Maggie A.; Bauer, James M.; Benford, Dominic J.; Bridge, Carrie R.; Lake, Sean E.; Petty, Sara M.; Stanford, S. A.; Tsai, Chao-Wei; Bailey, Vanessa; Beichman, Charles A.; Bloom, Joshua S.; Bochanski, John J.; Burgasser, Adam J.; Capak, Peter L.; Cruz, Kelle L.; Hinz, Philip M.; Kartaltepe, Jeyhan S.; Knox, Russell P.; Manohar, Swarnima; Masters, Daniel; Morales-Calderon, Maria; Prato, Lisa A.; Rodigas, Timothy J.; Salvato, Mara; Schurr, Steven D.; Scoville, Nicholas Z.; Simcoe, Robert A.; Stapelfeldt, Karl R.; Stern, Daniel; Stock, Nathan D.; Vacca, William D. (2011). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". The Astrophysical Journal Supplement 197 (2): 19. arXiv:1108.4677v1. Bibcode:2011ApJS..197...19K. doi:10.1088/0067-0049/197/2/19.  edit
  4. ^ Castro, Philip J.; Gizis, John E. (2012). "Discovery of a Late L Dwarf: WISEP J060738.65+242953.4". The Astrophysical Journal 746 (1): 3. arXiv:1110.4351. Bibcode:2012ApJ...746....3C. doi:10.1088/0004-637X/746/1/3.  edit
  5. ^ Gizis, John E.; Faherty, Jacqueline K.; Liu, Michael C.; Castro, Philip J.; Shaw, John D.; Vrba, Frederick J.; Harris, Hugh C.; Aller, Kimberly M.; Deacon, Niall R. (2012). "Discovery of an Unusually Red L-type Brown Dwarf". The Astronomical Journal 144 (4): 94. arXiv:1207.4012. Bibcode:2012AJ....144...94G. doi:10.1088/0004-6256/144/4/94.  edit