Astronomy:HD 190984 b
| Discovery[1] | |
|---|---|
| Discovered by | Santos et al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
| radial velocity (HARPS) | |
| Orbital characteristics[2] | |
| 8.8+2.5 −1.4 astronomical unit|AU | |
| Eccentricity | 0.745+0.054 −0.047 |
| Orbital period | 9971+4383 −2228 d 27.3+12.0 −6.1 yr |
| Average Orbital speed | 12.2 |
| Inclination | 64°+18° −23° or 116°+23° −18° |
| Longitude of ascending node | 108°+51° −82° |
| astron|astron|helion}} | 2464428+4507 −2245 |
| 315.3°±3.7° | |
| Semi-amplitude | 48 ± 1[1] |
| Star | HD 190984 |
| Physical characteristics[2] | |
| Mass | 3.58+1.2 −0.45 Jupiter mass |
HD 190984 b (also known as HIP 99496 b) is an exoplanet which orbits the F-type main sequence star HD 190984, located approximately 486 light-years away in the constellation Pavo. This planet has a minimum mass three times that of 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.
Since this is a very long-period planet detected by the radial velocity method and this planet didn't complete its 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. So this planet will need more years of observations to better constrain the period and semimajor axis.
In 2023, the inclination and true mass of HD 190984 b were determined via astrometry, and its orbit was updated, finding a longer period and larger semi-major axis than previously estimated, although still with a large margin of error.[2]
See also
References
- ↑ 1.0 1.1 1.2 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. doi:10.1051/0004-6361/200913489. Bibcode: 2010A&A...512A..47S. http://www.aanda.org/articles/aa/full_html/2010/04/aa13489-09/aa13489-09.html.
- ↑ 2.0 2.1 2.2 Xiao, Guang-Yao et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics 23 (5): 055022. doi:10.1088/1674-4527/accb7e. Bibcode: 2023RAA....23e5022X.
Coordinates: 
20h 11m 30.7166s, −64° 37′ 13.694″
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