قطر-4
| بيانات الرصـد الحقبة J2000.0 اعتدال J2000.0 | |
|---|---|
| الكوكبة | المرأة المسلسلة[1] |
| الصعود المستقيم | 00س 19د 26.22ث[2] |
| الميل | +44° 01′ 39.5″[2] |
| القدر الظاهري (V) | 13.60[3] |
| الخـصـائص | |
| النوع الطيفي | K1V[3] |
| النوع المتغير | planetary transit |
| علم القياسات الفلكية | |
| الحركة الحقيقية (μ) | RA: 0.923±0.011 mas/yr Dec.: −8.921±0.009 mas/س |
| اختلاف المنظر (π) | 3.0567 ± 0.0158[2] mas |
| المسافة | س ض ( ف ن) |
| التـفـاصـيل | |
| الكتلة | 0.856+0.029−0.030[4] M☉ |
| نصف القطر | 0.800+0.015−0.014[4] R☉ |
| الضياء | 0.481[3] L☉ |
| جاذبية السطح (ج) | 4.565+0.018−0.020[4] س.ج.ث. |
| درجة الحرارة | 5174+33−35[4] ك |
| المعدنية [Fe/H] | 0.095+0.076−0.088[4] العشرية |
| تسارع الدوران (v sin i) | 7.1±0.5[3] كم/ث |
| العمر | 170±0.1[3] م.س. |
| تسميات أخرى | |
Gaia DR3 385697172809355392, Qatar 4, UCAC3 269-3518
| |
| مراجع قواعد البيانات | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia | data |
قطر-4 is a faint K-dwarf star that hosts a planet in the constellation Andromeda. With an apparent magnitude of 13.60, it is impossible to detect with the naked eye, but can be detected with a powerful telescope. Qatar-4 is currently located 1,083 light years away based on parallax.
الخصائص
This star is a relatively young star with an age of only 170 million years. At this age, it is still on the main sequence. Qatar-4 has 89.6% the mass of the Sun, and 84.9% the latter's radius. Despite all of this, it only has 48.1% of the Sun's luminosity, which corresponds to an effective temperature of 5,120 K. Qatar-4 has a similar metallicity to the Sun, and rotates at a rate of 7.1 km/s.
نظام الكواكب
In 2016, the Qatar Exoplanet Survey discovered a planet around this star.
| الرفيق (بالترتيب من النجم) |
الكتلة | نصف المحور الأكبر (AU) |
الدور المداري (أيام) |
الانحراف | الميل | نصف القطر |
|---|---|---|---|---|---|---|
| ب | 5.26+0.22−0.21 MJ | 0.02861 | 1.80536494+9−7−{{{2}}} | 0.046+0.064−0.034 | 1.083+0.022−0.021 RJ |
| الاكتشاف[3] | |
|---|---|
| اكتشفه | Alsubai et al. 2019 |
| Transit | |
| السمات المدارية | |
| 0.02803 ± 0.00048 au[3] | |
| Eccentricity | 0[3] |
| 1.8053564 d[3] | |
| Inclination | 87.5 ± 1.6°[3] |
| Semi-amplitude | 957±16 m/s[3] |
| السمات الطبيعية | |
نصف القطر المتوسط | 1.135 ± 0.11 RJ[3] |
Mean radius | 1.135 ± 0.11 RJ[3] |
| Mass | 5.36 ± 0.20 MJ[3] |
Mean density | 4.50 ± 1.00 g cm−3[3] |
| Temperature | 1385 ± 50 K[3] |
قطر-4ب
قطر-4ب is a Super-Jupiter orbiting the star Qatar-4 every 1.8 days. It was discovered in 2016 by the Qatar Exoplanet Survey (QES).
This planet has a very short orbit, with only 1.8 days for it to complete an orbit around Qatar-4. The period corresponds with a separation of around 0.03 AU, which is almost 20 times closer than Mercury is to the Sun. Despite that, it has a perfectly round orbit. Since the host is an active star, Qatar-4 may be destroyed by tidal waves from the star.[5]
Qatar-4b has over 5 times the mass of Jupiter. Despite this, it has a radius that is only 13.5% larger than the latter's. This planet has an effective temperature of 1,385 K, which classifies as a hot Jupiter, and is denser than Jupiter, with about 4 times the density.
انظر أيضاً
المصادر
- ^ قالب:Cite constellation
- ^ أ ب ت قالب:Cite Gaia DR3
- ^ أ ب ت ث ج ح خ د ذ ر ز س ش ص ض Alsubai, Khalid; Mislis, Dimitris; Tsvetanov, Zlatan I.; Latham, David W.; Bieryla, Allyson; Buchhave, Lars A.; Esquerdo, Gilbert A.; Bramich, D. M.; Pyrzas, Stylianos; Vilchez, Nicolas P. E.; Mancini, Luigi (2017-04-01). "Qatar Exoplanet Survey : Qatar-3b, Qatar-4b, and Qatar-5b". The Astronomical Journal. 153 (4): 200. arXiv:1606.06882. Bibcode:2017AJ....153..200A. doi:10.3847/1538-3881/aa6340. ISSN 0004-6256. S2CID 119214858.
- ^ أ ب ت ث ج ح Wang, Xian-Yu; Wang, Yong-Hao; Wang, Songhu; Wu, Zhen-Yu; Rice, Malena; Zhou, Xu; Hinse, Tobias C.; Liu, Hui-Gen; et al. (2021), "Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves", The Astrophysical Journal Supplement Series 255 (1): 15, doi:, Bibcode: 2021ApJS..255...15W
- ^ Hamer, Jacob H.; Schlaufman, Kevin C. (2019-11-01). "Hot Jupiters Are Destroyed by Tides While Their Host Stars Are on the Main Sequence". The Astronomical Journal. 158 (5): 190. arXiv:1908.06998. Bibcode:2019AJ....158..190H. doi:10.3847/1538-3881/ab3c56. ISSN 0004-6256. S2CID 201103951.
قالب:Andromeda (constellation)
2016 في الفضاء | ||
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| رحلات فضاء |
| .jpg&filetimestamp=20130827234008&) |
| أ.ق.ن مختارة | ||
| كواكب خارج المجموعة الشمسية وأقزام بنية | ||
| استكشاف الفضاء | ||
| افتراضية جديدة | ||
