WISEPA J180435.40+311706.1
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Coordinates: 
18h 04m 35.39s, +31° 17′ 05.98″
| Observation data Epoch MJD 55459.94[ 1] Equinox J2000[ 1] | |
|---|---|
| Constellation | Hercules |
| Right ascension | 18h 04m 35.39s[ 1] |
| Declination | 31° 17′ 05.98″[ 1] |
| Characteristics | |
| Spectral type | T9.5:[ 1][ 1] |
| Apparent magnitude (J (2MASS filter system)) | >18.88[ 1] |
| Apparent magnitude (J (MKO filter system)) | 18.70 ± 0.05[ 1] |
| Apparent magnitude (H (2MASS filter system)) | >18.24[ 1] |
| Apparent magnitude (H (MKO filter system)) | 19.21 ± 0.11[ 1] |
| Apparent magnitude (KS (2MASS filter system)) | >16.86[ 1] |
| Astrometry | |
| Proper motion (μ) | RA: -242 ± 26[ 1] mas/yr Dec.: 17 ± 22[ 1] mas/yr |
| Parallax (π) | 60 ± 11[ 1] mas |
| Distance | approx. 54 ly (approx. 17 pc) |
| Other designations | |
WISEPA J180435.40+311706.1 (designation abbreviated to WISE 1804+3117, or WISE J1804+3117) is a brown dwarf of spectral class T9.5:,[ 1][ 1] located in constellation Hercules at approximately 54 light-years from Earth.[ 1]
History of observations
Discovery
WISE 1804+3117 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 1804+3117.[ 1][~ 1]
Distance
Currently the most accurate distance estimate of WISE 1804+3117 is a trigonometric parallax, measured using Spitzer Space Telescope and published in 2013 by Trent Dupuy and Adam Kraus: 0.060 ± 0.011 arcsec, corresponding to a distance 16.7+3.7
−2.6 pc, or 54.4+12.2
−8.4 ly.[ 1]
WISE 1804+3117 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Kirkpatrick et al. (2011) | ~13.0 | ~42.4 | [ 1] | |
| Kirkpatrick et al. (2012) | ~9.2 | ~30.0 | [ 1] | |
| Dupuy & Kraus (2013) | 60 ± 11[~ 2] | 16.7+3.7 −2.6 | 54.4+12.2 −8.4 | [ 1] |
Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.
Space motion
WISE 1804+3117 has proper motion of about 244 milliarcseconds per year.[ 1]
WISE 1804+3117 proper motion estimates
| Source | μ, mas/yr | P. A., ° | μRA, mas/yr | μDEC, mas/yr | Ref. |
|---|---|---|---|---|---|
| Kirkpatrick et al. (2011) | 1044 | 316 | -719 ± 414 | 757 ± 475 | [ 1] |
| Dupuy & Kraus (2013) | 244 ± 26 | 274 ± 5 | 242 ± 26 | 17 ± 22 | [ 1] |
The most accurate estimates are marked in bold.
Notes
- ↑ These 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.
- ↑ Relative parallax.
References
- ↑ 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.
- ↑ 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.
- ↑ 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.
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