Epoch J2000 Equinox J2000
|Right ascension||22h 20m 55.31s|
|Declination||−36° 28′ 17.4″|
|Apparent magnitude (J (MKO-NIR filter system))||20.38 ± 0.17|
|Apparent magnitude (H (MKO-NIR filter system))||20.81 ± 0.30|
|Distance||~ 26.4 ly
(~ 8.1 pc)
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 satellite — NASA 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.
Y-class dwarfs are among the coldest of all brown dwarfs.
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|||
Non-trigonometric distance estimates are marked in italic.
The other six discoveries of brown dwarfs, published in Kirkpatrick et al. (2012):
- WISE 0146+4234 (Y0)
- WISE 0350-5658 (Y1)
- WISE 0359-5401 (Y0)
- WISE 0535-7500 (≥Y1)
- WISE 0713-2917 (Y0)
- WISE 0734-7157 (Y0)
- 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.
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