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Kepler-289 
Summary
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]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| 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 | |
| Mass | 1.1[1] M☉ |
| Radius | 1.0645[1] R☉ |
| Luminosity | 0.1125588[1] L☉ |
| Temperature | 5968.88±41.9175[1] K |
| Metallicity [Fe/H] | -0.0098325 ± 0.0399191 Fe[1] dex |
| Age | 0.65±0.44[1] Gyr |
| Other designations | |
Planetary system edit
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.
| 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 | — | — |
| e (unconfirmed) | ? MJ | 1.58+0.69 −0.47 |
330.071558±0.006272 | 0 | — | — |
References edit
- ^ a b c d e f g h i j k l m "Kepler-289 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 10 September 2023.
- ^ a b c Schmitt, Joseph R.; Agol, Eric; Deck, Katherine M.; Rogers, Leslie A.; Gazak, J. Zachary; Fischer, Debra A.; Wang, Ji; Holman, Matthew J.; Jek, Kian J.; Margossian, Charles; Omohundro, Mark R. (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)". Astrophysical Journal. 795 (2): 167. arXiv:1410.8114. Bibcode:2014ApJ...795..167S. doi:10.1088/0004-637X/795/2/167. hdl:1721.1/93116. ISSN 0004-637X. S2CID 37872448.
- ^ "Kepler-289 b". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-02-11.
- ^ "The Extrasolar Planet Encyclopaedia — Kepler-289b". Extrasolar Planets Encyclopaedia. Retrieved 10 September 2023.
- ^ Zacharias, N.; Finch, C.; Subasavage, J.; Bredthauer, G.; Crockett, C.; Divittorio, M.; Ferguson, E.; Harris, F.; Harris, H.; Henden, A.; Kilian, C. (October 2015). "The First U.S. Naval Observatory Robotic Astrometric Telescope Catalog". The Astronomical Journal. 150 (4): 101. arXiv:1508.04637. Bibcode:2015AJ....150..101Z. doi:10.1088/0004-6256/150/4/101. ISSN 0004-6256. S2CID 32535965.
- ^ "The Extrasolar Planet Encyclopaedia — Kepler-289c". Extrasolar Planets Encyclopaedia. Retrieved 10 September 2023.
- ^ "Kepler-289 c". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-02-11.
- ^ "Kepler-289 d". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-02-11.
- ^ "The Extrasolar Planet Encyclopaedia — Kepler-289d". Extrasolar Planets Encyclopaedia. Retrieved 10 September 2023.