维基百科
2MASS J11145133−2618235
天球赤道座標： 11h 14m 51.337s，−26° 18′ 23.56″
2MASS J11145133−2618235 (名稱可縮寫為 2MASS 1114−2618), [3] 或 2M1114−26,[2] 或 2M1114−2618,[2] 或 2MASS 1114−26,[4] 或 2MASS J1114−2618[6]) 是一顆位於長蛇座附近光譜等級為T7.5的棕矮星[a]，距離地球約18光年。[7]
| 觀測資料 曆元 J2000[1] | |
|---|---|
| 星座 | 長蛇座 |
| 星官 | |
| 赤經 | 11h 14m 51.337s[1] |
| 赤緯 | −26° 18′ 23.56″[1] |
| 視星等（V） | |
| 特性 | |
| 光谱分类 | T7.5[2][3][4][5][6] |
| 视星等 (i (GMOS filter system)) | 23.21 ± 0.09[5] |
| 视星等 (z (GMOS filter system)) | 19.59 ± 0.04[5] |
| 视星等 (J (2MASS filter system)) | >15.86 ± 0.08[2][3] |
| 视星等 (J (MKO filter system)) | 15.52 ± 0.05[6] |
| 视星等 (H (2MASS filter system)) | >15.73 ± 0.12[3] |
| 视星等 (H (MKO filter system)) | 15.82 ± 0.05[6] |
| 视星等 (KS (2MASS filter system)) | >16.1[3] |
| 视星等 (KS (MKO filter system)) | 16.54 ± 0.05[6] |
| 天体测定 | |
| 自行 (μ) | 赤经：-3018.8 ± 1.1[7] mas/yr 赤纬：-384.1 ± 1.4[7] mas/yr |
| 视差 (π) | 179.2 ± 1.4[7] mas |
| 距离 | 18.2 ± 0.1 ly (5.58 ± 0.04 pc) |
| 詳細資料 | |
| 質量 | 0.029–0.048[4] M☉ |
| 表面重力 (log g) | 5.0–5.3[4] |
| 溫度 | 725–775[4] K |
| 金屬量 | -0.3 ± 0.1 [m/H][4] |
| 年齡 | 3–8[4] Gyr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
2M1114−26 2M1114−26在長蛇座的位置 | |
空間運動
2MASS 1114−2618有相當大的自行3043.2 mas / yr，位置角262.75度，[7] 表示在天空中向西南方向運動。在距離18.20ly（假設視差 179.2 ± 1.4 mas）處，[7]對應的切向速度為 80.56 km/s。[7]
參見
其他四顆同時發現的棕矮星。[2]
- 2MASS 0050−3322 (T7.5)
- 2MASS 0939−2448 (T8，棕矮星聯星系統)
- 2MASS 0949−1545 (T1)
- 2MASS 1122−3512 (T2)
註釋
- ^ The nearest known star/brown dwarf in this constellation.
參考資料
- ^ 1.0 1.1 1.2 1.3 2MASS J11145133-2618235 -- Brown Dwarf (M<0.08solMass). SIMBAD. Centre de données astronomiques de Strasbourg. [26 July 2012].
- ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Tinney, C. G.; Burgasser, Adam J.; Kirkpatrick, J. Davy; McElwain, Michael W. The 2MASS Wide-Field T Dwarf Search. IV. Hunting Out T Dwarfs with Methane Imaging. The Astronomical Journal. 2005, 130 (5): 2326–2346. Bibcode:2005AJ....130.2326T. S2CID 119451860. arXiv:astro-ph/0508150 . doi:10.1086/491734.
- ^ 3.0 3.1 3.2 3.3 3.4 3.5 Burgasser, Adam J.; Geballe, T. R.; Leggett, S. K.; Kirkpatrick, J. Davy; Golimowski, David A. A Unified Near-Infrared Spectral Classification Scheme for T Dwarfs. The Astrophysical Journal. 2006, 637 (2): 1067–1093. Bibcode:2006ApJ...637.1067B. S2CID 8823326. arXiv:astro-ph/0510090 . doi:10.1086/498563.
- ^ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 Leggett, Sandy K.; Marley, Mark S.; Freedman, Richard; Saumon, Didier; Liu, Michael C.; Geballe, Thomas R.; Golimowski, David A.; Stephens, Denise C. Physical and Spectral Characteristics of the T8 and Later Type Dwarfs. The Astrophysical Journal. 2007, 667 (1): 537–548. Bibcode:2007ApJ...667..537L. S2CID 16667510. arXiv:0705.2602 . doi:10.1086/519948.
- ^ 5.0 5.1 5.2 Leggett, Sandy K.; Saumon, Didier; Marley, Mark S.; Lodders, Katharina; Canty, J.; Lucas, Philip W.; Smart, Richard L.; Tinney, Chris G.; Homeier, Derek; Allard, France; Burningham, Ben; Day-Jones, Avril; Fegley, Bruce; Ishii, Miki; Jones, Hugh R. A.; Marocco, Federico; Pinfield, David J.; Tamura, Motohide. The Properties of the 500 K Dwarf UGPS J072227.51-054031.2 and a Study of the Far-red Flux of Cold Brown Dwarfs. The Astrophysical Journal. 2012, 748 (2): 74. Bibcode:2012ApJ...748...74L. S2CID 14171934. arXiv:1201.2973 . doi:10.1088/0004-637X/748/2/74.
- ^ 6.0 6.1 6.2 6.3 6.4 6.5 Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem. The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs. The Astrophysical Journal. 2012, 752 (1): 56. Bibcode:2012ApJ...752...56F. S2CID 18160586. arXiv:1203.5543 . doi:10.1088/0004-637X/752/1/56.
- ^ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Dupuy, Trent J.; Liu, Michael C. The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition. The Astrophysical Journal Supplement. 2012, 201 (2): 19. Bibcode:2012ApJS..201...19D. S2CID 119256363. arXiv:1201.2465 . doi:10.1088/0067-0049/201/2/19.
- ^ 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, Amy K.; Burgasser, Adam J.; Tinney, Chris G.; Parker, Stephen; Salter, Graeme. Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function. The Astrophysical Journal. 2012, 753 (2): 156. Bibcode:2012ApJ...753..156K. S2CID 119279752. arXiv:1205.2122 . doi:10.1088/0004-637X/753/2/156.