109 Piscium b

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109 Piscium b[1]
Exoplanet List of exoplanets
Parent star
Star 109 Piscium
Constellation Pisces
Right ascension (α) 01h 44m 55.82s[2]
Declination (δ) +20° 04′ 59.3″[2]
Apparent magnitude (mV) 6.29
Distance106 ± 1[2] ly
(32.6 ± 0.5[2] pc)
Spectral type G5IV
Orbital elements
Semi-major axis(a) 2.16±0.12 AU
Eccentricity (e) 0.1023±0.0096
Orbital period(P) 1076.4±2.4 d
Argument of
(ω) 108.9±8.2°
Time of periastron (T0) 2,450,396±29 JD
Semi-amplitude (K) 115±1.5 m/s
Physical characteristics
Minimum mass(m sin i)6.38±0.53 MJ
Discovery information
Discovery date November 1, 1999[3]
Discoverer(s) Vogt et al.[4]
Discovery method Radial velocity
Discovery site Keck Observatory[3]
Discovery status Published[4]
Other designations
HD 10697 b
Database references
Extrasolar Planets
Exoplanet Archivedata
Open Exoplanet Cataloguedata

109 Piscium b (aka HD 10697 b) is a long-period extrasolar planet discovered in orbit around 109 Piscium. It is at least 6.38 times the mass of Jupiter and is likely to be a gas giant. As typical 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 10-20 K warmer because of internal heating.[4]

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, so the true inclination and mass remain unknown.[6]

A more plausible suggestion is that this planet shares its star's inclination, of 69+21

See also[edit]

  • 54 Piscium b - another nearby planet in the constellation of Pisces


  1. ^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493Freely accessible. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. 
  2. ^ a b c d van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  3. ^ a b "Astronomers discover six new planets orbiting nearby stars" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. November 1, 1999. Retrieved December 19, 2017. 
  4. ^ a b c Vogt, Steven S.; et al. (2000). "Six New Planets from the Keck Precision Velocity Survey". The Astrophysical Journal. 536 (2): 902–914. arXiv:astro-ph/9911506Freely accessible. Bibcode:2000ApJ...536..902V. doi:10.1086/308981. 
  5. ^ Han; Black, David C.; Gatewood, George; et al. (2001). "Preliminary astrometric masses for proposed extrasolar planetary companions". The Astrophysical Journal Letters. 548 (1): L57–L60. Bibcode:2001ApJ...548L..57H. doi:10.1086/318927. Archived from the original on 2009-04-29. Retrieved 2009-04-09. 
  6. ^ Pourbaix, D. & Arenou, F. (2001). "Screening the Hipparcos-based astrometric orbits of sub-stellar objects". Astronomy and Astrophysics. 372 (3): 935–944. arXiv:astro-ph/0104412Freely accessible. Bibcode:2001A&A...372..935P. doi:10.1051/0004-6361:20010597. 
  7. ^ "hd_10697_b". Extrasolar Planet Encyclopaedia. 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". arXiv:1211.2002Freely accessible. Bibcode:2013AN....334..180S. doi:10.1002/asna.201211765. 

Coordinates: Sky map 01h 44m 55s, +20° 04′ 59″