109 Piscium b
Long-period gas giant orbiting 109 Piscium
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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.
| Discovery[1][2] | |
|---|---|
| Discovered by | California and Carnegie Planet Search |
| Discovery site | W. M. Keck Observatory |
| Discovery date | November 1, 1999 |
| Doppler spectroscopy | |
| Orbital characteristics[3] | |
| 2.051+0.079 â0.087 AU | |
| Eccentricity | 0.104+0.009 â0.008 |
| 2.944 ± 0.002 years (1,075.30 ± 0.73 d) | |
| Inclination | 86.116°+19.957° â20.530° |
| 38.852°+15.084° â21.589° | |
| 2,449,333.898+14.739 â15.380 | |
| 112.816°+5.254° â5.448° | |
| Semi-amplitude | 114.583+1.067 â1.196 m/s |
| Star | 109 Piscium |
| Physical characteristics[3] | |
| 1.152 RJ[4] | |
| Mass | 5.743+1.011 â0.289 MJ |
The discoverers estimate its effective temperature as 264 K from solar heating, but it could be at least 10 to 20 K warmer because of internal heating.[2] It orbits within the habitable zone.[1]
Preliminary astrometric measurements suggested that the orbital inclination is 170.3°,[5] 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.[6] A more plausible suggestion is that this planet shares its star's inclination, of 69+21
â26°.[7][8] 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.[3]
See also
- 54 Piscium b â another nearby planet in the constellation of Pisces
- List of exoplanets discovered before 2000