WISEPA J195246.66+724000.8
| Observation data Epoch MJD 55590.99[1] Equinox J2000[1] | |
|---|---|
| Constellation | Draco |
| Right ascension | 19h 52m 46.61s[1] |
| Declination | 72° 40′ 00.61″[1] |
| Characteristics | |
| Spectral type | T4[1] |
| Apparent magnitude (J (2MASS filter system)) | 15.086±0.045[1] |
| Apparent magnitude (H (2MASS filter system)) | 14.728±0.077[1] |
| Apparent magnitude (KS (2MASS filter system)) | 14.650±0.078[1] |
| Astrometry | |
| Proper motion (μ) | RA: −220±69[1] mas/yr Dec.: −347±72[1] mas/yr |
| Distance | ~ 44.4[1] ly (~ 13.6[1] pc) |
| Other designations | |
WISEPA J195246.66+724000.8 (designation abbreviated to WISE 1952+7240, or WISE J1952+7240) is a brown dwarf of spectral class T4,[1] located in constellation Draco at approximately 44 light-years from Earth.[1]
Discovery
WISE 1952+7240 was discovered in 2011 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 2011 Kirkpatrick et al. published a paper in The Astrophysical Journal Supplement, where they 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 1952+7240.[1][note 1]
Distance
Trigonometric parallax of WISE 1952+7240 is not yet measured. Therefore, there are only distance estimates of this object, obtained by indirect — spectrofotometric — means (see table).
WISE 1952+7240 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Kirkpatrick et al. (2011) | ~13.6 | ~44.4 | [1] |
Non-trigonometric distance estimates are marked in italic.
Notes
- ^ This 98 brown dwarf systems are only among first, not all brown dwarf systems, discovered from data, collected by WISE: six discoveries was published earlier (however, also listed in Kirkpatrick et al. (2011)) in Mainzer et al. (2011) and Burgasser et al. (2011), and the other discoveries was published later.
References
- ^ a b c d e f g h i j k l m n o p q r s 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.
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