109 Piscium

109 Piscium is a yellow hued G-type main-sequence star located about 108 light years away in the zodiac constellation of Pisces. It is near the lower limit of visibility to the naked eye with an apparent visual magnitude of 6.27.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −45.5 km/s.[4] It has one known exoplanet.[10]

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) 6.27[2]
Characteristics
Spectral type G3 Va[3]
U−B color index 0.23
B−V color index 0.720±0.009[2]
Variable type none
Astrometry
Radial velocity (Rv)−45.53±0.09[4] 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[5]
Details
Mass1.11±0.03[6] M☉
Radius1.9155±0.0521[7] R☉
Luminosity2.8888±0.0833[7] L☉
Temperature5600±75[8] K
Metallicity [Fe/H]0.15±0.04[4] dex
Rotation32.6±1.6 d[9]
Rotational velocity (v sin i)1.3[5] km/s
Age6.75±0.71[6] Gyr
Other designations
BD+19° 282, GJ 72, HD 10697, HIP 8159, HR 508[8]
Database references
SIMBADdata

With a stellar classification of G3 Va,[3] this is a Sun-like star with a similar mass[6] but a 91%[7] larger radius. (Cowley and Bidelman (1979) had this classified as a subgiant star that is leaving the main sequence.[11]) It is 6.75[6] billion years old with a higher abundance of iron[4] and a low projected rotational velocity of 1.3 km/s.[5] The star is radiating 2.9[7] times the Sun's luminosity from its photosphere at an effective temperature of 5,442 K.[7]

Planetary system

On 1 November 1999 the discovery of an extrasolar planet orbiting this star was announced.[10] The planet has a minimum mass of more than 6 times that of Jupiter and takes just under three years to orbit its parent star.[12]

The star rotates at an inclination of 69+21
−26 degrees relative to Earth.[9] It is probable that this planet shares that inclination.[13][14]

The 109 Piscium planetary system[15]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥6.383±0.078 MJ 2.140±0.088 1075.69±0.82 0.1043±0.0083 — —

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.

gollark: Imagine how bad it could be with active deliberate effort to enhance badness.
gollark: I would make it fill out the paperwork itself. Much easier.
gollark: Not even very memetic memes.
gollark: Yep. This is the trouble with free-ranging them.
gollark: No, my chickens got killed by a fox...

See also

References
  1. 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. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. "109 Psc -- High proper-motion Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 December 2017.
  9. 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"
  10. "Astronomers discover six new planets orbiting nearby stars" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. 1 November 1999. Retrieved 19 December 2017.
  11. Cowley, A. P.; Bidelman, W. P. (February 1979), "MK spectral types for some F and G stars", Publications of the Astronomical Society of the Pacific, 91: 83–86, Bibcode:1979PASP...91...83C, doi:10.1086/130446
  12. 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.
  13. "hd_10697_b". Extrasolar Planet Encyclopaedia. Retrieved 12 November 2012.
  14. Sanchis-Ojeda, Roberto; Winn, Josh N.; Fabrycky, Daniel C. (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.
  15. Luhn, Jacob K.; et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal. 157 (4). 149. arXiv:1811.03043. Bibcode:2019AJ....157..149L. doi:10.3847/1538-3881/aaf5d0.

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