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HD 190984 b

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Extrasolar planet in the constellation Pavo
HD 190984 b
Discovery
Discovered bySantos et al.
Discovery siteLa Silla Observatory
Discovery dateOctober 19, 2009
Detection methodradial velocity (HARPS)
Orbital characteristics
Semi-major axis8.8+2.5
−1.4 AU
Eccentricity0.745+0.054
−0.047
Orbital period (sidereal)9971+4383
−2228 d
27.3+12.0
−6.1 yr
Average orbital speed12.2
Inclination64°+18°
−23° or 116°+23°
−18°
Longitude of ascending node108°+51°
−82°
Time of periastron2464428+4507
−2245
Argument of periastron315.3°±3.7°
Semi-amplitude48 ± 1
StarHD 190984
Physical characteristics
Mass3.58+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 AU with an eccentricity of 0.57. 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.

See also

References

  1. ^ 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.
  2. ^ 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.
Constellation of Pavo
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