ADS 7251
ADS 7251是一個位於大熊座的雙星系統，距離太陽有6.33秒差距(20.66光年）。
| 觀測數據 曆元 J2000 分點 J2000 | |
|---|---|
| 星座 | 大熊座 |
| ADS 7251 A | |
| 赤經 | 09h 14m 22.7749s[1] |
| 赤緯 | 52° 41′ 11.792″[1] |
| 視星等 (V) | 7.64[2] |
| ADS 7251 B | |
| 赤經 | 09h 14m 24.6828s[3] |
| 赤緯 | 52h 41m 10.902s[3] |
| 視星等 (V) | 7.70[2] |
| 特性 | |
| 光譜分類 | M0V[4] |
| 視星等 (B) | 9.05[2] |
| 視星等 (G) | 6.976[1] |
| 視星等 (J) | 4.89[a][5] |
| 視星等 (H) | 3.987[a][5] |
| 視星等 (K) | 3.99[a][5] |
| B−V 色指數 | +1.41[6] |
| J−H 色指數 | +0.90[b] |
| J−K 色指數 | +0.90[b] |
| 天體測定 | |
| ADS 7251 A (HD 79210) | |
| 徑向速度 (Rv) | 11.245±0.0007[1] km/s |
| 自行 (μ) | 赤經：−1,545.787±0.018[1] mas/yr 赤緯：−569.053±0.018[1] mas/yr |
| 視差 (π) | 157.8879 ± 0.0197[1] mas |
| 距離 | 20.657 ± 0.003 ly (6.3336 ± 0.0008 pc) |
| 絕對星等 (MV) | 8.637[7] |
| ADS 7251 B | |
| 徑向速度 (Rv) | 12.104±0.0008[3] km/s |
| 自行 (μ) | 赤經：−1,573.040±0.018[3] mas/yr 赤緯：−659.906±0.018[3] mas/yr |
| 視差 (π) | 157.8825 ± 0.0211[3] mas |
| 距離 | 20.658 ± 0.003 ly (6.3338 ± 0.0008 pc) |
| 絕對星等 (MV) | 8.712[7] |
| 軌道[8] | |
| 繞行週期 (P) | 975 yr |
| 半長軸 (a) | 16.725" |
| 偏心率 (e) | 0.28 |
| 詳細資料 [9] | |
| A | |
| 質量 | 0.69±0.07 M☉ |
| 半徑 | 0.58±0.02 R☉ |
| 表面重力 (log g) | 4.68±0.07 |
| 亮度 | 0.0789±0.0038 L☉ |
| 溫度 | 4,024±51 K |
| 自轉 | 16.3+3.5 −1.3 |
| 自轉速度 (v sin i) | 2.0±1.2 km/s |
| B | |
| 質量 | 0.64±0.07 M☉ |
| 半徑 | 0.58±0.03 R☉ |
| 表面重力 (log g) | 4.68±0.07 |
| 亮度 | 0.0792±0.0031 L☉ |
| 溫度 | 4,005±51 K |
| 自轉 | 16.61±0.04 |
| 自轉速度 (v sin i) | 2.3±1.5 km/s |
| 年齡 | 1–7 Gyr |
| Other designations | |
| A: BD+53°1320、HD 79210、HIP 45343 | |
| B: BD+53°1321、HD 79211、HIP 120005 | |
| 參考資料庫 | |
| SIMBAD | The system |
| A | |
| B | |
  ADS 7251 ADS 7251在大熊座的位置 | |
這兩顆恆星共享一個略微偏心的軌道，其半長軸為16.725″，週期為975年。[10]
ADS 7251 A比ADS 7251 B亮0.06星等。MK光譜等級目錄將兩顆恆星列為二級標準，ADS 7251 A為M0V級，ADS 7251 B為K7V級，在具有較晚光譜類型的較亮恆星。[4]
行星系統
ADS 7251 B也稱為Gliese 338B或 HD 79211，由一顆已知的超級地球圍繞其運行，並通過徑向速度檢測到。[9]
| 成員 (依恆星距離) |
質量 | 半長軸 (AU) |
軌道周期 (天) |
離心率 | 傾角 | 半徑 |
|---|---|---|---|---|---|---|
| b | 10.8+1.2 − M⊕ |
0.142+0.005 − |
24.422+0.014 − |
0.11+0.11 −0.08 |
— | — |
註釋
參考
- ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533
. doi:10.1051/0004-6361/202039657 . 已忽略未知參數|collaboration=(幫助) (勘誤: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR. - ^ 2.0 2.1 2.2 Huang, Y.; Liu, X. -W.; Yuan, H. -B.; Xiang, M. -S.; Chen, B. -Q.; Zhang, H. -W. Empirical metallicity-dependent calibrations of effective temperature against colours for dwarfs and giants based on interferometric data. Monthly Notices of the Royal Astronomical Society. 2015, 454 (3): 2863. Bibcode:2015MNRAS.454.2863H. S2CID 118487917. arXiv:1508.06080 . doi:10.1093/mnras/stv1991.
- ^ 3.0 3.1 3.2 3.3 3.4 3.5 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知參數
|collaboration=(幫助) (勘誤: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR. - ^ 4.0 4.1 Kirkpatrick, J. D.; et al. A standard stellar spectral sequence in the red/near-infrared - Classes K5 to M9. Astrophysical Journal Supplement Series. 1991, 77: 417. Bibcode:1991ApJS...77..417K. doi:10.1086/191611.
- ^ 5.0 5.1 5.2 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003). CDS/ADC Collection of Electronic Catalogues. 2003, 2246: II/246 [2023-03-22]. Bibcode:2003yCat.2246....0C. （原始內容存檔於2021-04-21）.
- ^ Bobylev, V. V.; Goncharov, G. A.; Bajkova, A. T. VizieR Online Data Catalog: Orion Spiral Arm CAtalogue (OSACA) (Bobylev+, 2006). VizieR On-line Data Catalog. 2007. Bibcode:2007yCat..90830821B.
- ^ 7.0 7.1 Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs. The Astronomical Journal. 2019, 158 (2): 56. Bibcode:2019AJ....158...56H. S2CID 159041104. arXiv:1905.07921 . doi:10.3847/1538-3881/ab23fe.
- ^ Malkov, O. Yu.; et al. Dynamical Masses of a Selected Sample of Orbital Binaries. Astronomy & Astrophysics. 2012, 546: 5. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774 . A69.
- ^ 9.0 9.1 González-Álvarez, E.; Osorio, M. R. Zapatero; Caballero, J. A.; Sanz-Forcada, J.; Béjar, V. J. S.; González-Cuesta, L.; Dreizler, S.; Bauer, F. F.; Rodríguez, E.; Tal-Or, L.; Zechmeister, M. The CARMENES search for exoplanets around M dwarfs. A super-Earth planet orbiting HD 79211 (GJ 338 B). Astronomy & Astrophysics. May 2020, 637: A93. Bibcode:2020A&A...637A..93G. ISSN 0004-6361. arXiv:2003.13052 . doi:10.1051/0004-6361/201937050 .
- ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog. The Astronomical Journal. 2001, 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920 .
- ^ Ditomasso, Victoria; et al, Independent Validation of the Temperate Super-Earth HD 79211 b using HARPS-N, The Astronomical Journal, 2023, 165 (2): 38, Bibcode:2023AJ....165...38D, S2CID 253098124, arXiv:2210.12211 , doi:10.3847/1538-3881/ac9ccd
