WISE 2220−3628

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Coordinates: Sky map 22h 20m 55.31s, −36° 28′ 17.4″

WISE J222055.31−362817.4
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Grus
Right ascension 22h 20m 55.31s[1]
Declination −36° 28′ 17.4″[1]
Spectral type Y0[1]
Apparent magnitude (J (MKO-NIR filter system)) 20.38 ± 0.17[1]
Apparent magnitude (H (MKO-NIR filter system)) 20.81 ± 0.30[1]
Distance ~ 26.4[1] ly
(~ 8.1[1] pc)
Other designations
WISE J222055.31−362817.4,[1]
WISE 2220−3628[1]

WISE J222055.31−362817.4 (designation abbreviated to WISE 2220−3628) is a brown dwarf of spectral class Y0,[1] located in constellation Grus at approximately 26 light-years from Earth.[1]


WISE 2220−3628 was discovered in 2012 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 2012 Kirkpatrick et al. published a paper in The Astrophysical Journal, where they presented discovery of seven new found by WISE brown dwarfs of spectral type Y, among which also was WISE 2220−3628.[1]


Y-class dwarfs are among the coldest of all brown dwarfs.[1]


Trigonometric parallax of WISE 2220−3628 is not yet measured. Therefore, there are only distance estimates of this object, obtained by indirect — spectrofotometric — means (see table).

WISE 2220−3628 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Kirkpatrick et al. (2012), Table 8 8.1 26.4 [1]

Non-trigonometric distance estimates are marked in italic.

See also[edit]

The other six discoveries of brown dwarfs, published in Kirkpatrick et al. (2012):[1]


  1. ^ a b c d e f g h i j k l m n o p q Kirkpatrick, J. D.; Gelino, C. R.; Cushing, M. C.; Mace, G. N.; Griffith, R. L.; Skrutskie, M. F.; Marsh, K. A.; Wright, E. L.; Eisenhardt, P. R.; McLean, I. S.; Mainzer, A. K.; Burgasser, A. J.; Tinney, C. G.; Parker, S.; Salter, G. (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". The Astrophysical Journal 753 (2): 156. arXiv:1205.2122. Bibcode:2012ApJ...753..156K. doi:10.1088/0004-637X/753/2/156.  edit