HD 89307 b is an exoplanet orbiting the star HD 89307 located approximately 104 light-years away in the constellation of Leo. The planet takes roughly 2164 days or 5.9 years to orbit its star. The planet's minimum mass is 1.92 MJ; initially, the true mass could not be determined since the inclination was unknown. As is common for many long-period exoplanets, the eccentricity is greater than any planets in the Solar System, orbiting at an average distance of 3.28 AU. The speed of the wobble caused by the planet's gravity is 31 meters per second. The average orbital velocity is 16.6 m/s.[1] In 2023, the inclination and true mass of HD 89307 b were determined via astrometry.[3]

HD 89307 b
Discovery[1][2]
Discovered byButler et al.
Fischer et al.
Discovery siteUnited States
Discovery dateDecember 26, 2004
radial velocity
Orbital characteristics[3]
3.331+0.052
−0.053
 AU
Eccentricity0.174+0.041
−0.043
2188+30
−28
 d

5.991+0.081
−0.078
 yr
16.6
Inclination72°+13°
−15°
or 108°+15°
−13°
151+20
−133
2456758±96
22+320
−14
Semi-amplitude31.0 ± 4.9
StarHD 89307
Physical characteristics[3]
Mass2.02+0.27
−0.15
 MJ

References

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  1. ^ a b Butler; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. S2CID 119067572. Archived from the original on 2019-12-07. Retrieved 2009-03-11.
  2. ^ Fischer, Debra; et al. (2009). "Five planets and an independent confirmation of HD 196885 Ab from Lick Observatory". The Astrophysical Journal. 703 (2): 1545–1556. arXiv:0908.1596. Bibcode:2009ApJ...703.1545F. doi:10.1088/0004-637X/703/2/1545. S2CID 15524804.
  3. ^ a b c Xiao, Guang-Yao; Liu, Yu-Juan; et al. (March 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. arXiv:2303.12409.
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