WISEPC J205628.90+145953.3
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Coordinates: 
20h 56m 28.88s, +14° 59′ 53.68″
| Observation data Epoch MJD 55511.01[1] Equinox J2000[1] |
|
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 56m 28.88s[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: 881 ± 57[3] mas/yr Dec.: 544 ± 42[3] mas/yr |
| Parallax (π) | 144 ± 44[3] mas |
| Distance | 24.5+14.0 −5.9[3] ly (7.5+4.3 −1.8[3] 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] |
| Temperature | 350 (350—400)[4] K |
| Other designations | |
WISEPC J205628.90+145953.3 (designation is abbreviated to WISE 2056+1459) is a brown dwarf of spectral class Y0,[1][2] located in constellation Delphinus at approximately 24.5 light-years from Earth.[3]
Contents |
Discovery [edit]
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][note 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] This seven objects are also the faintest seven of 98 brown dwarfs, presented in Kirkpatrick et al. (2011).[1]
Distance [edit]
Trigonometric parallax of WISE 0410+1502, published in 2013 by Marsh et al., is 0.144 ± 0.044 arcsec, corresponding to a distance 7.5+4.3
−1.8 pc, or 24.5+14.0
−5.9 ly.[3][note 2]
WISE 2056+1459 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Kirkpatrick et al. (2011), Table 6 | 7.7 | 25.1 | [1] | |
| Cushing et al. (2011), Table 7 | 3.0+3.4 −0.6 |
9.8+11.1 −2.0 |
[4] | |
| Kirkpatrick et al. (2012), Tables 4 & 8 | 192 | 5.2 | 17.0 | [2] |
| Marsh et al. (2013) (according Kirkpatrick et al. (2012)) |
? (value is roughly the size of the error itself) |
? | ? | [2] |
| Marsh et al. (2013) | 144 ± 44 | 7.5+4.3 −1.8[note 2] |
24.5+14.0 −5.9 |
[3] |
Non-trigonometric distance estimates are marked in italic.
Space motion [edit]
WISE 2056+1459 has proper motion of about 1035 milliarcseconds per year.[3]
WISE 2056+1459 proper motion estimates
| Source | μ, mas/yr |
P. A., ° |
μRA, mas/yr |
μDEC, mas/yr |
Ref. |
|---|---|---|---|---|---|
| Kirkpatrick et al. (2011) | 872 | 44 | 604 ± 393 | 629 ± 378 | [1] |
| Marsh et al. (2013) | 1035 | 58 | 881 ± 57 | 544 ± 42 | [3] |
The most accurate estimates are marked in bold.
Temperature [edit]
The object's temperature estimate is 350 (350—400) K.[4]
See also [edit]
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 [edit]
- ^ 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.
- ^ a b 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 due to the fact that 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).
References [edit]
- ^ a b c d e f g h i j k l m n o p q r 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.
- ^ a b c d Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Mace, Gregory N.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Eisenhardt, Peter R.; McLean, Ian S.; Mainzer, Amanda K.; Burgasser, Adam J.; Tinney, C. G.; Parker, Stephen; Salter, Graeme (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.
- ^ a b c d e f g h i j 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.
- ^ a b c d e f g h i j 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.
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