109 Piscium b | |
Image Alt: | Render of 109 Piscium b made with SpaceEngine |
Discoverer: | California and Carnegie Planet Search |
Discovery Site: | W. M. Keck Observatory |
Discovered: | November 1, 1999 |
Discovery Method: | Doppler spectroscopy |
Period: | 2.944± |
Mean Radius: | [1] |
109 Piscium b (aka HD 10697 b) is a long-period extrasolar planet discovered in orbit around 109 Piscium. It is about 5.74 times the mass of Jupiter and is likely to be a gas giant. As is common for long-period planets discovered around other stars, it has an orbital eccentricity greater than that of Jupiter.
The discoverers estimate its effective temperature as from solar heating, but it could be at least 10 to 20 K warmer because of internal heating. It orbits within the habitable zone.
Preliminary astrometric measurements suggested that the orbital inclination is 170.3°, yielding an object mass of 38 times that of Jupiter, which would make it a brown dwarf. However, subsequent analysis indicates that the precision of the measurements used to derive the astrometric orbit is insufficient to constrain the parameters. A more plausible suggestion is that this planet shares its star's inclination, of 69°.[2] [3] In 2022, the inclination and true mass of 109 Piscium b were measured via astrometry. The inclination estimate is consistent with that of the stellar rotation.