WISEPC J014807.25-720258.7

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Coordinates: Sky map 01h 48m 07.4s, −72° 02′ 58.87″

WISEPC J014807.25-720258.7
Observation data
Epoch MJD 55580[1]      Equinox J2000[1]
Constellation Hydrus
Right ascension 01h 48m 07.4s[1]
Declination −72° 02′ 58.87″[1]
Spectral type T9.5[1][2][3]
Apparent magnitude (J (MKO filter system)) 18.96 ± 0.07[1]
Apparent magnitude (H (MKO filter system)) 19.22 ± 0.04[1]
Proper motion (μ) RA: 1257 ± 38[4] mas/yr
Dec.: -8 ± 33[4] mas/yr
Parallax (π) 60 ± 16[4] mas
Distance approx. 50 ly
(approx. 17 pc)
Mass 13 (13—21)[2] MJup
Radius 1.04 (0.96—1.04)[2] RJup
Surface gravity (log g) 4.50 (4.50—4.75)[2] cgs
Temperature 500[2] K
Other designations
WISEPC J014807.25-720258.7[1]
WISEPC J0148−7202[2]
WISE J0148-7202[1]
WISE 0148-7202[1]

WISEPC J014807.25-720258.7 (designation is abbreviated to WISE 0148-7202) is a brown dwarf of spectral class T9.5,[1][2][3] located in constellation Hydrus at approximately 54 light-years from Earth.[4]

History of observations[edit]


WISE 0148-7202 was discovered in 2011 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. WISE 0148-7202 has two discovery papers: Kirkpatrick et al. (2011) and Cushing et al. (2011), however, basically with the same authors and published nearly simultaneously.[1][2]

  • Kirkpatrick et al. 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 0148-7202.[1][~ 1]
  • Cushing et al. presented discovery of seven brown dwarfs — one of T9.5 type (WISE 0148-7202), and six of Y-type — first members of the Y spectral class, ever discovered and spectroscopically confirmed, including "archetypal member" of the Y spectral class WISE 1828+2650.[2] These seven objects are also the faintest seven of 98 brown dwarfs, presented in Kirkpatrick et al. (2011).[1]


Currently the most accurate distance estimate of WISE 0148-7202 is a trigonometric parallax, measured using Spitzer Space Telescope and published in 2013 by Trent Dupuy and Adam Kraus: 0.060 ± 0.016 arcsec, corresponding to a distance 16.7+6.1
pc, or 54.4+19.8

WISE 0148-7202 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Kirkpatrick et al., 2011, Table 6
~ 12.1 ~ 39.5 [1]
Cushing et al., 2011, Table 7
Kirkpatrick et al., 2012, Tables 4 & 8
~ 9.2 ~ 30.0 [3]
Dupuy & Kraus (2013) 60 ± 16[~ 2] 16.7+6.1

Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.

Space motion[edit]

WISE 0148-7202 has proper motion of about 1257 milliarcseconds per year.[4]

WISE 0148-7202 proper motion estimates

Source μ,
P. A.,
Kirkpatrick et al. (2011) 1108 94 1106 ± 355 -73 ± 332 [1]
Dupuy & Kraus (2013) 1257 ± 38 90.4 ± 1.5 1257 ± 38 -8 ± 33 [4]

The most accurate estimates are marked in bold.

Physical properties[edit]

The object's temperature estimate is 500 K.[2]

See also[edit]

The other six discoveries of brown dwarfs, published in Cushing et al. (2011):[2]


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


  1. ^ a b c d e f g h i j k l m n o p 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
  2. ^ a b c d e f g h i j k l Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Mainzer, A.; Marsh, Kenneth A.; Beichman, Charles A.; Burgasser, Adam J.; Prato, Lisa A.; Simcoe, Robert A.; Marley, Mark S.; Saumon, D.; Freedman, Richard S.; Eisenhardt, Peter R.; Wright, Edward L. (2011). "The Discovery of Y Dwarfs using Data from the Wide-field Infrared Survey Explorer (WISE)". arXiv:1108.4678v1 [astro-ph.SR]. Bibcode 2011ApJ...743...50C. doi:10.1088/0004-637X/743/1/50. edit
  3. ^ a b c 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
  4. ^ a b c d e f g h Dupuy, Trent J.; Kraus, Adam L. (2013). "Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects". arXiv:1309.1422v1 [astro-ph.SR]. Bibcode 2013arXiv1309.1422D.