109 Piscium b

109 Piscium b
Render of 109 Piscium b made with SpaceEngine
Render of 109 Piscium b made with SpaceEngine
Discovery[1][2]
Discovered byCalifornia and
Carnegie Planet Search
Discovery siteW. M. Keck Observatory
Discovery dateNovember 1, 1999
Doppler spectroscopy
Orbital characteristics[3]
2.051+0.079
−0.087 AU
Eccentricity0.104+0.009
−0.008
2.944 ± 0.002 years (1,075.30 ± 0.73 d)
Inclination86.116°+19.957°
−20.530°
38.852°+15.084°
−21.589°
2,449,333.898+14.739
−15.380
112.816°+5.254°
−5.448°
Semi-amplitude114.583+1.067
−1.196 m/s
Star109 Piscium
Physical characteristics[3]
1.152 RJ[4]
Mass5.743+1.011
−0.289 MJ

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 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
−26°.[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]

  1. ^ a b Cite error: The named reference Keck was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Vogt2000 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Feng2022 was invoked but never defined (see the help page).
  4. ^ "The Extrasolar Planet Encyclopaedia — 109 Psc b". Extrasolar Planets Encyclopaedia. Paris Observatory.
  5. ^ Cite error: The named reference Han2001 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Pourbaix2001 was invoked but never defined (see the help page).
  7. ^ "hd_10697_b". Extrasolar Planets Encyclopaedia. 1995. Retrieved November 12, 2012.
  8. ^ Roberto Sanchis-Ojeda; Josh N. Winn; Daniel C. Fabrycky (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten. 334 (1–2): 180–183. arXiv:1211.2002. Bibcode:2013AN....334..180S. doi:10.1002/asna.201211765. S2CID 38743202.