109 Piscium

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109 Piscium
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension  01h 44m 55.8251s[1]
Declination +20° 04′ 59.3363″[1]
Apparent magnitude (V) 6.292
Spectral type G3 Va[2]
U−B color index 0.23
B−V color index 0.720
Variable type none
Radial velocity (Rv)−45.53±0.09[3] km/s
Proper motion (μ) RA: −42.979±0.069[1] mas/yr
Dec.: −104.889±0.068[1] mas/yr
Parallax (π)30.1639 ± 0.0400[1] mas
Distance108.1 ± 0.1 ly
(33.15 ± 0.04 pc)
Absolute magnitude (MV)3.73[4]
Mass1.11±0.03[5] M
Radius1.9155±0.0521[6] R
Luminosity2.8888±0.0833[6] L
Temperature5442±65[6] K
Metallicity [Fe/H]0.15±0.04[3] dex
Rotation32.6±1.6 d[7]
Rotational velocity (v sin i)1.3[4] km/s
Age6.75±0.71[5] Gyr
Other designations
BD+19° 282, GJ 72, HD 10697, HIP 8159, HR 508[8]
Database references

109 Piscium is a yellow hued G-type main-sequence star located about 108 light years away in the constellation Pisces. It has a mass similar to that of the Sun, and has a higher abundance of iron.

Planetary system[edit]

On 1 November 1999 the discovery of an extrasolar planet orbiting this star was announced.[9][10]

The star rotates at an inclination of 69+21
degrees relative to Earth.[7] It is probable that this planet shares that inclination.[11][12]

The 109 Piscium planetary system[13]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >6.38 ± 0.53 MJ 2.16 ± 0.12 1076.4 ± 2.4 0.1023 ± 0.0096

Popular culture[edit]

In the 1983 Star Trek novel The Wounded Sky by Diane Duane, the USS Enterprise intentionally causes 109 Piscium to go supernova by entering warp drive too close to the star, in order to destroy a group of pursuing Klingon vessels. Captain Kirk experiences an uneasy sense that he may "get in trouble with Starfleet" over this arguably rash course of action.

See also[edit]


  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  3. ^ a b Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474.
  4. ^ a b Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P.
  5. ^ a b Ghezzi, L.; et al. (December 2010), "Metallicities of Planet-hosting Stars: A Sample of Giants and Subgiants", The Astrophysical Journal, 725 (1): 721–733, arXiv:1008.3539, Bibcode:2010ApJ...725..721G, doi:10.1088/0004-637X/725/1/721.
  6. ^ a b c Boyajian, Tabetha S.; et al. (2013). "Stellar Diameters and Temperatures. III. Main-Sequence A, F, G, and K Stars: Additional High-Precision Measurements and Empirical Relations". The Astrophysical Journal. 771 (1). 40. arXiv:1306.2974. Bibcode:2013ApJ...771...40B. doi:10.1088/0004-637X/771/1/40.
  7. ^ a b Simpson, E. K.; et al. (November 2010), "Rotation periods of exoplanet host stars", Monthly Notices of the Royal Astronomical Society, 408 (3): 1666–1679, arXiv:1006.4121, Bibcode:2010MNRAS.408.1666S, doi:10.1111/j.1365-2966.2010.17230.x. as "HD 10697"
  8. ^ "109 Piscium". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-12-20.
  9. ^ "Astronomers discover six new planets orbiting nearby stars" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. 1 November 1999. Retrieved 19 December 2017.
  10. ^ 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/9911506. Bibcode:2000ApJ...536..902V. doi:10.1086/308981.
  11. ^ "hd_10697_b". Extrasolar Planet Encyclopaedia. Retrieved 12 November 2012.
  12. ^ Sanchis-Ojeda, Roberto; Winn, Josh N.; Fabrycky, Daniel C. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". arXiv:1211.2002. Bibcode:2013AN....334..180S. doi:10.1002/asna.201211765.
  13. ^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.

External links[edit]

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