WISEPA J195246.66+724000.8

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Coordinates: Sky map 19h 52m 46.61s, +72° 40′ 00.61″

WISEPA J195246.66+724000.8
Observation data
Epoch MJD 55590.99[1]      Equinox J2000[1]
Constellation Draco
Right ascension 19h 52m 46.61s[1]
Declination 72° 40′ 00.61″[1]
Spectral type T4[1]
Apparent magnitude (J (2MASS filter system)) 15.086±0.045[1]
Apparent magnitude (H (2MASS filter system)) 14.728±0.077[1]
Apparent magnitude (KS (2MASS filter system)) 14.650±0.078[1]
Proper motion (μ) RA: −220±69[1] mas/yr
Dec.: −347±72[1] mas/yr
Distance~ 44.4[1] ly
(~ 13.6[1] pc)
Other designations
WISEPA J195246.66+724000.8[1]
WISE J1952+7240[1]
WISE 1952+7240[1]

WISEPA J195246.66+724000.8 (designation abbreviated to WISE 1952+7240, or WISE J1952+7240) is a brown dwarf of spectral class T4,[1] located in constellation Draco at approximately 44 light-years from Earth.[1]


WISE 1952+7240 was discovered in 2011 by J. Davy Kirkpatrick 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. In 2011 Kirkpatrick et al. published a paper in The Astrophysical Journal Supplement, where they presented discovery of 98 new found by WISE brown dwarf systems with components of spectral types M, L, T and Y, among which also was WISE 1952+7240.[1][note 1]


Trigonometric parallax of WISE 1952+7240 is not yet measured. Therefore, there are only distance estimates of this object, obtained by indirect — spectrofotometric — means (see table).

WISE 1952+7240 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Kirkpatrick et al. (2011) ~13.6 ~44.4 [1]

Non-trigonometric distance estimates are marked in italic.


  1. ^ This 98 brown dwarf systems are only among first, not all brown dwarf systems, discovered from data, collected by WISE: six discoveries was published earlier (however, also listed in Kirkpatrick et al. (2011)) in Mainzer et al. (2011) and Burgasser et al. (2011), and the other discoveries was published later.


  1. ^ a b c d e f g h i j k l m n o p q r s 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:1108.4677v1Freely accessible. Bibcode:2011ApJS..197...19K. doi:10.1088/0067-0049/197/2/19.