قطر-2
| بيانات الرصـد الحقبة J2000 اعتدال J2000 | |
|---|---|
| الكوكبة | العذراء[1] |
| الصعود المستقيم | 13س 50د 37.4100ث[2] |
| الميل | −06° 48′ 14.422″[2] |
| القدر الظاهري (V) | 13.3[3] |
| الخـصـائص | |
| النوع الطيفي | K5V[4] |
| علم القياسات الفلكية | |
| السرعة القطرية (Rv) | −23.55[5] كم/ث |
| الحركة الحقيقية (μ) | RA: −88.171[2] mas/yr Dec.: −15.187[2] mas/س |
| اختلاف المنظر (π) | 5.4023 ± 0.0195[2] mas |
| المسافة | س ض ( ف ن) |
| التـفـاصـيل[6][3] | |
| الكتلة | 0.727+0.024−{{{2}}} M☉ |
| نصف القطر | 0.7033+0.0080−{{{2}}} R☉ |
| جاذبية السطح (ج) | 4.601+0.018−{{{2}}} س.ج.ث. |
| درجة الحرارة | 4,645+50−{{{2}}} ك |
| المعدنية [Fe/H] | 0.13+0.1−{{{2}}}[7] العشرية |
| الدوران | 18.0+0.2−{{{2}}} |
| تسارع الدوران (v sin i) | 2.0+0.2−{{{2}}} كم/ث |
| العمر | 9 م.س. |
| تسميات أخرى | |
| مراجع قواعد البيانات | |
| SIMBAD | data |
قطر-2 is a K-type main-sequence star about 595 light-years away in the constellation of Virgo. The star is much older than Sun, and has a concentration of heavy elements similar to solar abundance.[3] The star features a numerous and long-lived starspots,[6] and belongs to a peculiar variety of inflated K-dwarfs with strong magnetic activity inhibiting internal convection.[9]
نظام الكواكب
In 2011 a transiting superjovian planet Qatar-2b was detected by the Qatar Exoplanet Survey.[3] The planet has a large measured temperature difference between dayside 1,368±32 K and nightside 724±135 K.[10] The planetary orbit is well aligned with the equatorial plane of the star,[7] misalignment angle equal to 4.3°±4.5°.[11] No orbital decay was detected.[12] The color of planetary atmosphere is blue due to Rayleigh scattering of light,[11] and albedo is very low, being below 0.06.[12]
An additional massive companion on wide orbit was suspected in 2011,[3] but search utilizing transit-timing variation method has yielded zero results in 2017.[6]
| المرافق (بالترتيب من النجم) |
الكتلة | نصف المحور الرئيسي (و.ف.) |
الدور المداري (يوم) |
الانحراف | الميل | نصف القطر |
|---|---|---|---|---|---|---|
| b | 2.466+0.062−{{{2}}} MJ | 0.02136+0.00024−{{{2}}} | 1.33711677+0.00000010−{{{2}}} | 0 | 1.115+0.013−{{{2}}} RJ |
المصادر
- ^ قالب:Cite constellation
- ^ أ ب ت ث ج قالب:Cite Gaia DR3
- ^ أ ب ت ث ج ح Bryan, Marta L.; Alsubai, Khalid A.; Latham, David W.; Parley, Neil R.; Collier Cameron, Andrew; Quinn, Samuel N.; Carter, Joshua A.; Fulton, Benjamin J.; et al. (2011), "Qatar-2: A K dwarf orbited by a transiting hot Jupiter and a more massive companion in an outer orbit", The Astrophysical Journal 750: 84, doi:
- ^ Dressing, Courtney D.; Newton, Elisabeth R.; Schlieder, Joshua E.; Charbonneau, David; Knutson, Heather A.; Vanderburg, Andrew; Sinukoff, Evan (2017). "Characterizing K2 Candidate Planetary Systems Orbiting Low-mass Stars. I. Classifying Low-mass Host Stars Observed during Campaigns 1-7". The Astrophysical Journal. 836 (2): 167. arXiv:1701.00586. Bibcode:2017ApJ...836..167D. doi:10.3847/1538-4357/836/2/167.
- ^ قالب:Cite Gaia DR2
- ^ أ ب ت ث Močnik, T.; Southworth, J.; Hellier, C. (2017), "Recurring sets of recurring starspot occultations on exoplanet-host Qatar-2", Monthly Notices of the Royal Astronomical Society 471 (1): 394–403, doi:, Bibcode: 2017MNRAS.471..394M
- ^ أ ب Esposito, M.; Covino, E.; Desidera, S.; Mancini, L.; Nascimbeni, V.; Zanmar Sanchez, R.; Biazzo, K.; Lanza, A. F.; et al. (2017), "The GAPS Programme with HARPS-N at TNG. XIII. The orbital obliquity of three close-in massive planets hosted by dwarf K-type stars: WASP-43, HAT-P-20 and Qatar-2", Astronomy & Astrophysics 601: A53, doi:, Bibcode: 2017A&A...601A..53E
- ^ "Qatar 2". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-05-05.
- ^ Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015), "A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars", Astronomy & Astrophysics 577: A90, doi:, Bibcode: 2015A&A...577A..90M
- ^ May, E. M.; Stevenson, K. B.; Bean, Jacob L.; Bell, Taylor J.; Cowan, Nicolas B.; Dang, Lisa; Desert, Jean-Michel; Fortney, Jonathan J.; et al. (2022), "A New Analysis of Eight Spitzer Phase Curves and Hot Jupiter Population Trends: Qatar-1b, Qatar-2b, WASP-52b, WASP-34b, and WASP-140b", The Astronomical Journal 163 (6): 256, doi:, Bibcode: 2022AJ....163..256M
- ^ أ ب Mancini, L.; Southworth, J.; Ciceri, S.; Tregloan-Reed, J.; Crossfield, I.; Nikolov, N.; Bruni, I.; Zambelli, R.; et al. (2014), "Physical properties, starspot activity, orbital obliquity, and transmission spectrum of the Qatar-2 planetary system from multi-colour photometry", Monthly Notices of the Royal Astronomical Society 443 (3): 2391, doi:, Bibcode: 2014MNRAS.443.2391M
- ^ أ ب Dai, Fei; Winn, Joshua N.; Yu, Liang; Albrecht, Simon (2016), "The Stellar Obliquity, Planet Mass, and Very Low Albedo of Qatar-2 from K2 Photometry", The Astronomical Journal 153: 40, doi:
