astro.wikisort.org - Meteorite
HD 190984 b (also known as HIP 99496 b) is an extrasolar planet which orbits the F-type main sequence star HD 190984, located approximately 330 light years away in the constellation Pavo. This planet is at least three times more massive than Jupiter and takes 13 years and four-and-a-half months to orbit the star at a semimajor axis of 5.5 AU with an eccentricity of 0.57.[1] This planet was detected by HARPS on October 19, 2009, together with 29 other planets.
| Discovery | |
|---|---|
| Discovered by | Santos et al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
Detection method | radial velocity (HARPS) |
| Orbital characteristics | |
| Apastron | 8.6 AU (1.29×109 km) |
| Periastron | 2.4 AU (360,000,000 km) |
Semi-major axis | 5.5 ± 1.3 AU (820,000,000 ± 190,000,000 km)[1] |
| Eccentricity | 0.57 ± 0.10[1] |
Orbital period (sidereal) | 4885 ± 1600[1] d 13.37 ± 4.4 y |
Average orbital speed | 12.2 |
Time of periastron | 2,449,572 ± 1600[1] |
Argument of periastron | 318 ± 5[1] |
| Semi-amplitude | 48 ± 1[1] |
| Star | HD 190984 |
Since this is a very long-period planet detected by the radial velocity method that this planet didn't complete the orbit during the continuous observations, the error range for orbital period is very large, at 4885 ± 1600 days or 13.37 ± 4.4 years. This puts it in the range of semimajor axes between 4.2 and 6.6 AU or between 630 and 990 Gm. So this planet will need couple more years of observations to better constrain the period and semimajor axis.
See also
- HD 5388 b
- HD 181720 b
- 23 Librae c
References
- Santos, Nuno C.; Mayor, Michel; Benz, Willy; Bouchy, François; et al. (2010). "The HARPS Search for Southern Extra-solar Planets XXI. Three New Giant Planets Orbiting the Metal-poor Stars HD 5388, HD 181720, and HD 190984". Astronomy and Astrophysics. 512 (A47): A47. arXiv:0912.3216. Bibcode:2010A&A...512A..47S. doi:10.1051/0004-6361/200913489. S2CID 118675798.
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На других языках
- [en] HD 190984 b
[es] HD 190984 b
HD 190984 b (también conocido como HIP 99496 b) es un planeta extrasolar que orbita la estrella de tipo F de la secuencia principal HD 190984, localizado aproximadamente a 618 años luz, en la constelación de Pavo.Este planeta tiene al menos 3 veces la masa de Júpiter y tarda 13,37 años en completar su periodo orbital, con un semieje mayor de 5,95 UA. Sin embargo, a diferencia de la mayoría de los exoplanetas conocidos, su excentricidad no se conoce, pero es habitual que se desconozca su inclinación. Este planeta fue detectado por HARPS el 19 de octubre de 2009, junto con 29 otros planetas. El astrónomo Wladimir Lyra (2009) ha propuesto Cydippe como el nombre común posible para HD 190984 b.[1]Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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