Astronomy:Kepler-289

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Short description: Star in Cygnus hosting four planets
Kepler-289
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  19h 49m 51.68s[1]
Declination +42° 52′ 58.27″[1]
Characteristics
Evolutionary stage main sequence star
Variable type planetary transit
Astrometry
Proper motion (μ) RA: 4.7788 ± 0.0294139[1] mas/yr
Dec.: -0.2374610 ± 0.0303047[1] mas/yr
Parallax (π)1.39093 ± 0.0176152[1] mas
Details
Mass1.1[1] M
Radius1.0645[1] R
Luminosity0.1125588[1] L
Temperature5968.88±41.9175[1] K
Metallicity [Fe/H]-0.0098325 ± 0.0399191 Fe[1] dex
Age0.65±0.44[1] Gyr
Other designations
2MASS J19495168+4252582, KOI-1353, Kepler-289, KIC 7303287, PH3, TIC 273234825, WISE J194951.68+425258.2, Gaia DR2 2078515170549178880[1]

Kepler-289 (PH3) is a rotating variable star slightly more massive than the Sun, with an unknown spectral type, 2300 light-years away from Earth in the constellation of Cygnus. In 2014, three exoplanets were discovered orbiting it.[1]

Planetary system

Kepler-289 hosts four planets, three confirmed (Kepler-289b,[2][3][4][5] Kepler-289c,[6][2][7] Kepler-289d[2][8][9]) and one unconfirmed candidate (Kepler-289e). The discovery of this system was made using the transit method. The inner three planets were found in 2014 with the Kepler space telescope and the Planet Hunters team, while planet e was discovered by follow-up studies in 2017.

Template:Orbitbox planet hypothetical
The Kepler-289 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.04±0.002 MJ 0.2 34.545 0
d 0.01 MJ 0.3 66.1 0
c 0.4 MJ 0.5 125.85 0

References

  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 "Kepler-289 | NASA Exoplanet Archive". https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-289. 
  2. 2.0 2.1 2.2 Schmitt, Joseph R.; Agol, Eric; Deck, Katherine M.; Rogers, Leslie A.; Gazak, J. Zachary; Fischer, Debra A.; Wang, Ji; Holman, Matthew J. et al. (November 2014). "Planet Hunters. VII. Discovery of a New Low-mass, Low-density Planet (PH3c) Orbiting Kepler-289 with Mass Measurements of Two Additional Planets (PH3b and d)" (in en). Astrophysical Journal 795 (2): 167. doi:10.1088/0004-637X/795/2/167. ISSN 0004-637X. Bibcode2014ApJ...795..167S. 
  3. "Kepler-289 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-289+b. 
  4. "The Extrasolar Planet Encyclopaedia — Kepler-289b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/kepler_289_b--1863/. 
  5. Zacharias, N.; Finch, C.; Subasavage, J.; Bredthauer, G.; Crockett, C.; Divittorio, M.; Ferguson, E.; Harris, F. et al. (October 2015). "The First U.S. Naval Observatory Robotic Astrometric Telescope Catalog" (in en). The Astronomical Journal 150 (4): 101. doi:10.1088/0004-6256/150/4/101. ISSN 0004-6256. Bibcode2015AJ....150..101Z. 
  6. "The Extrasolar Planet Encyclopaedia — Kepler-289c". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/kepler_289_c--1864/. 
  7. "Kepler-289 c". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-289+c. 
  8. "Kepler-289 d". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-289+d. 
  9. "The Extrasolar Planet Encyclopaedia — Kepler-289d". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/kepler_289_d--2567/.