109 Piscium b[1]
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>109 Piscium</td></tr><tr> <td colspan="2">Constellation</td> <td>Pisces</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>01h 44m 55.82s[2]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+20° 04′ 59.3″[2]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>6.29</td></tr><tr><td colspan="2">Distance</td><td>106 ± 1[2] ly
(32.6 ± 0.5[2] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>2.16±0.12 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.1023±0.0096</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>1076.4±2.4 d</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>108.9±8.2°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,450,396±29 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>115±1.5 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>6.38±0.53 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>November 14, 1999</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Vogt et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Keck Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

Other designations
HD 10697 b

<tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

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.[3]

Preliminary astrometric measurements suggested that the orbital inclination is 170.3°,[4] 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.[5]

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

See alsoEdit

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


  1. (2006). Catalog of Nearby Exoplanets. The Astrophysical Journal 646 (1): 505–522.
  2. 2.0 2.1 2.2 2.3 (2007). Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2): 653–664.Vizier catalog entry
  3. Vogt et al. (2000). Six New Planets from the Keck Precision Velocity Survey. The Astrophysical Journal 536 (2): 902–914.
  4. Han et al. (2001). Preliminary astrometric masses for proposed extrasolar planetary companions. The Astrophysical Journal Letters 548 (1): L57–L60.
  5. Pourbaix, D. and Arenou, F. (2001). Screening the Hipparcos-based astrometric orbits of sub-stellar objects. Astronomy and Astrophysics 372 (3): 935–944.
  6. hd_10697_b. Extrasolar Planet Encyclopaedia. Retrieved November 12, 2012.
  7. Roberto Sanchis-Ojeda, Josh N. Winn, Daniel C. Fabrycky (2012). Starspots and spin-orbit alignment for Kepler cool host stars.

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

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