WISEPC J205628.90+145953.3

Coordinates: 20^h 56^m 28.88^s, +14° 59′ 53.68″

WISEPC J205628.90+145953.3

Observation data Epoch MJD 55511.01[1]      Equinox J2000[1]
Constellation	Delphinus
Right ascension	20^h 56^m 28.88^s[1]
Declination	14° 59′ 53.68″[1]
Characteristics
Spectral type	Y0[1][2]
Apparent magnitude (J (2MASS filter system))	>17.6[1]
Apparent magnitude (J (MKO filter system))	19.21 ± 0.07[1]
Apparent magnitude (H (2MASS filter system))	>17.1[1]
Apparent magnitude (H (MKO filter system))	19.56 ± 0.18[1]
Astrometry
Proper motion (μ)	RA: 812 ± 9[3] mas/yr Dec.: 534 ± 8[3] mas/yr
Parallax (π)	140 ± 9[3] mas
Distance	23 ± 1 ly (7.1 ± 0.5 pc)
Details
Mass	20 (12—30)[4] MJup
Radius	0.93 (0.86—1.01)[4] RJup
Surface gravity (log g)	4.75 (4.5—5.0)[4] cgs
Temperature	350 (350—400)[4] K
Other designations
WISEPC J205628.90+145953.3[1] WISEPC J2056+1459[4] WISE J2056+1459[1] WISE 2056+1459[1]

WISE 2056+1459 (full designation WISEPC J205628.90+145953.3) is a brown dwarf of spectral class Y0,^[1][2] located in constellation Delphinus at approximately 23.3 light-years from Earth.^[3]

History of observations

Discovery

WISE 2056+1459 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 2056+1459 has two discovery papers: Kirkpatrick et al. (2011) and Cushing et al. (2011), however, basically with the same authors and published nearly simultaneously.^[1][4]

• 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 2056+1459.^{[1][~ 1]}
• Cushing et al. presented discovery of seven brown dwarfs — one of T9.5 type, 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, and WISE 2056+1459.^[4] These seven objects are also the faintest seven of 98 brown dwarfs, presented in Kirkpatrick et al. (2011).^[1]

Distance

Currently the most accurate distance estimate of WISE 2056+1459 is a trigonometric parallax, published in 2014 by Beichman et al.: 0.140 ± 0.009 arcsec, corresponding to a distance 7.1+0.5
−0.4 pc, or 23.3+1.6
−1.4 ly.^[3]

Space motion

WISE 2056+1459 has proper motion of about 972 milliarcseconds per year.^[3]

Temperature

The object's temperature estimate is 350 (350—400) K.^[4]

See also

The other six discoveries of brown dwarfs, published in Cushing et al. (2011):^[4]

• WISE 0148-7202 (T9.5)
• WISE 0410+1502 (Y0)
• WISE 1405+5534 (Y0 (pec?))
• WISE 1541-2250 (Y0.5)
• WISE 1738+2732 (Y0)
• WISE 1828+2650 (≥Y2)

Notes

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.

References

1. 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.
2. 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.
3. Beichman, C.; Gelino, Christopher R.; Kirkpatrick, J. Davy; Cushing, Michael C.; Dodson-Robinson, Sally; Marley, Mark S.; Morley, Caroline V.; Wright, E. L. (2014). "WISE Y Dwarfs As Probes of the Brown Dwarf-Exoplanet Connection". The Astrophysical Journal 783 (2): 68. arXiv:1401.1194v2. Bibcode:2014ApJ...783...68B. doi:10.1088/0004-637X/783/2/68.
4. 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)". The Astrophysical Journal 743 (1): 50. arXiv:1108.4678. Bibcode:2011ApJ...743...50C. doi:10.1088/0004-637X/743/1/50.

• 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:1211.6977. Bibcode:2013ApJ...762..119M. doi:10.1088/0004-637X/762/2/119.