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 | |
Eccentricity | 0.745+0.054 −0.047 |
9971+4383 −2228 d 27.3+12.0 −6.1 yr | |
Average orbital speed | 12.2 |
Inclination | 64°+18° −23° or 116°+23° −18° |
108°+51° −82° | |
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 MJ |
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
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
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[edit]
References[edit]
- ^ a b c 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.
- ^ a b c Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. 23 (5): 055022. arXiv:2303.12409. Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e.