WISE J0254+0223

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Coordinates: Sky map 02h 54m 09.62s, +02° 23′ 58.85″

WISEPA J025409.45+022359.1
Observation data
Epoch MJD 55588.27[1]      Equinox J2000[1]
Constellation Cetus
Right ascension 02h 54m 09.62s[1]
Declination 02° 23′ 58.85″[1]
Spectral type T8[1]
Apparent magnitude (Y (MKO filter system)) 16.999±0.014[2]
Apparent magnitude (J (2MASS filter system)) 16.557±0.156[1]
Apparent magnitude (J (MKO filter system)) 15.916±0.008[2]
Apparent magnitude (H (2MASS filter system)) 15.884±0.199[1]
Apparent magnitude (H (MKO filter system)) 16.29±0.02[2]
Apparent magnitude (KS (2MASS filter system)) >16.006[1]
Apparent magnitude (K (MKO filter system)) 16.73±0.05[2]
Proper motion (μ) RA: 2588±27[3] mas/yr
Dec.: 273±27[3] mas/yr
Parallax (π) 135 ± 15[3] mas
Distance approx. 24 ly
(approx. 7.4 pc)
Other designations
WISEPC J025409.45+022359.1[4]
WISEPA J025409.45+022359.1[1]
WISE J0254+0223[1]
PSO J043.5395+02.3995[5]
PSO J043.5+02[5]

WISEPA J025409.45+022359.1 (designation is abbreviated to WISE 0254+0223) is a brown dwarf of spectral class T8,[1][6] located in constellation Cetus at approximately 24.2 light-years from Earth.[3]

History of observations[edit]


WISE 0254+0223 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 0254+0223 has two discovery papers: Scholz et al. (2011) and Kirkpatrick et al. (2011) (the first was published earlier).[4][1]


Currently the most accurate distance estimate of WISE 0254+0223 is a trigonometric parallax, measured using Spitzer Space Telescope and published in 2013 by Trent Dupuy and Adam Kraus: 0.135 ± 0.015 arcsec, corresponding to a distance 7.4+0.9
, or 24.2+3.0

WISE 0254+0223 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Scholz et al. (2011) (preprint version 1) 5.5+1.4
Scholz et al. (2011) 5.5+2.3
Kirkpatrick et al. (2011), Table 6 ~ 6.9 ~ 22.5 [1]
Kirkpatrick et al. (2011), Table 7 165±46 6.1+2.3
Liu et al. (2011) 7.2±0.7 23.5±2.3 [5]
Liu et al. (2011) 171±45 5.8+2.1
Scholz et al. (2012) 165±20 6.1+0.8
Marsh et al. (2013)
(according to Kirkpatrick et al. (2012))
166±26 6.0+1.1
Marsh et al. (2013) 185±42 4.9+1.0
[~ 2]
Dupuy & Kraus (2013) 135 ± 15[~ 3] 7.4+0.9

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

Space motion[edit]

WISE 0254+0223 has a large proper motion of about 2602 milliarcseconds per year.[3]

WISE 0254+0223 proper motion estimates

Source μ,
P. A.,
Scholz et al. (2011) 2511 84 2496±46 276±47 [4]
Kirkpatrick et al. (2011) 2546 85 2534±28 243±37 [1]
Marsh et al. (2013) 2596 83 2578±42 309±50 [9]
Dupuy & Kraus (2013) 2602±27 84.0±0.6 2588±27 273±27 [3]

The most accurate estimates are marked in bold.

See also[edit]

Another object, discovered by Scholz et al. (2011):[4]


  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. ^ In this parallax and distance estimates the most probable distance value does not equal to inverse maximum likelihood parallax value, as would be in the case of exact parallax and distance values. This is because Marsh et al. used a more sophisticated method of converting maximum likelihood parallaxes into most probable distances, that uses also some prior information, and not just the calculation of the inverse value. (The method description see in Marsh et al. (2013), Section 4).
  3. ^ 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:1108.4677v1Freely accessible. Bibcode:2011ApJS..197...19K. doi:10.1088/0067-0049/197/2/19. 
  2. ^ a b c d Liu, Michael C.; Dupuy, Trent J.; Bowler, Brendan P.; Leggett, S. K.; Best, William M. J. (2012). "Two Extraordinary Substellar Binaries at the T/Y Transition and the Y-band Fluxes of the Coolest Brown Dwarfs". The Astrophysical Journal. 758 (1): 57. arXiv:1206.4044Freely accessible. Bibcode:2012ApJ...758...57L. doi:10.1088/0004-637X/758/1/57. 
  3. ^ a b c d e f g h Dupuy, T. J.; Kraus, A. L. (2013). "Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects". Science. 341 (6153): 1492–5. arXiv:1309.1422Freely accessible. Bibcode:2013Sci...341.1492D. doi:10.1126/science.1241917. PMID 24009359. 
  4. ^ a b c d e Scholz, R.-D.; Bihain, G.; Schnurr, O.; Storm, J. (2011). "Two very nearby (d ~ 5 pc) ultracool brown dwarfs detected by their large proper motions from WISE, 2MASS, and SDSS data". Astronomy & Astrophysics. 532: L5. arXiv:1105.4059Freely accessible. Bibcode:2011A&A...532L...5S. doi:10.1051/0004-6361/201117297. 
  5. ^ a b c d Liu, Michael C.; Deacon, Niall R.; Magnier, Eugene A.; Dupuy, Trent J.; Aller, Kimberly M.; Bowler, Brendan P.; Redstone, Joshua; Goldman, Bertrand; Burgett, W. S.; Chambers, K. C.; Hodapp, K. W.; Kaiser, N.; Kudritzki, R.-P.; Morgan, J. S.; Price, P. A.; Tonry, J. L.; Wainscoat, R. J. (2011). "A Search for High Proper Motion T Dwarfs with PAN-STARRS1 + 2MASS + WISE". The Astrophysical Journal Letters. 740 (2): L32. arXiv:1107.4608Freely accessible. Bibcode:2011ApJ...740L..32L. doi:10.1088/2041-8205/740/2/L32. 
  6. ^ a b 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:1205.2122Freely accessible. Bibcode:2012ApJ...753..156K. doi:10.1088/0004-637X/753/2/156. 
  7. ^ Scholz, R.-D.; Bihain, G.; Schnurr, O.; Storm, J. (2011). "Two very nearby (d~5 pc) ultracool brown dwarfs detected by their large proper motions from WISE, 2MASS, and SDSS data". arXiv:1105.4059v1Freely accessible [astro-ph.GA]. 
  8. ^ Scholz, R.-D.; Bihain, G.; Schnurr, O.; Storm, J. (2012). "UKIDSS detections of cool brown dwarfs. Proper motions of 14 known >T5 dwarfs and discovery of three new T5.5-T6 dwarfs". Astronomy & Astrophysics. 541: A163. arXiv:1204.2380Freely accessible. Bibcode:2012A&A...541A.163S. doi:10.1051/0004-6361/201218947. 
  9. ^ a b Marsh, Kenneth A.; Wright, Edward L.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Griffith, Roger L.; Skrutskie, Michael F.; Eisenhardt, Peter R. (2013). "Parallaxes and Proper Motions of Ultracool Brown Dwarfs of Spectral Types Y and Late T". The Astrophysical Journal. 762 (2): 119. arXiv:1211.6977Freely accessible. Bibcode:2013ApJ...762..119M. doi:10.1088/0004-637X/762/2/119. 

External links[edit]