Summary
Kepler-167 is a K-type main-sequence star located about 1,119 light-years (343 pc) away from the Solar System in the constellation of Cygnus. The star has about 78% the mass and 75% the radius of the Sun, and a temperature of 4,884 K (4,611 °C; 8,332 °F). It hosts a system of four known exoplanets. There is also a companion red dwarf star at a separation of about 700 AU, with an estimated orbital period of over 15,000 years.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 30m 38.02619s[2] |
| Declination | +38° 20′ 43.4372″[2] |
| Apparent magnitude (V) | 14.284±0.126[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | K3-K4[4] + M4V[5] |
| Apparent magnitude (V) | 14.284±0.126[3] |
| Apparent magnitude (G) | 13.988±0.003[2] |
| Apparent magnitude (J) | 12.446±0.022[6] |
| Apparent magnitude (H) | 11.974±0.023[6] |
| Apparent magnitude (K) | 11.832±0.022[6] |
| Astrometry | |
| Radial velocity (Rv) | −26.79±2.21[2] km/s |
| Proper motion (μ) | RA: 15.097 mas/yr[2] Dec.: 36.352 mas/yr[2] |
| Parallax (π) | 2.9157 ± 0.0131 mas[2] |
| Distance | 1,119 ± 5 ly (343 ± 2 pc) |
| Absolute magnitude (MV) | 6.53±0.12[4] |
| Details[5] | |
| Mass | 0.777+0.034 −0.031 M☉ |
| Radius | 0.749±0.020 R☉ |
| Luminosity (bolometric) | 0.289+0.017 −0.020 L☉ |
| Surface gravity (log g) | 4.579+0.027 −0.025 cgs |
| Temperature | 4884+69 −75 K |
| Metallicity [Fe/H] | 0.020±0.067 dex |
| Rotational velocity (v sin i) | <2[4] km/s |
| Age | 7.1+4.4 −4.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Planetary system edit
Kepler-167 is orbited by four known transiting exoplanets, discovered using the Kepler space telescope. The inner three planets are all super-Earths of unknown composition orbiting closer to their star than Mercury is to the Sun. The outermost planet, Kepler-167e, is a Jupiter analog, with 0.91 RJ, 1.01 MJ, and an equilibrium temperature of 134 K (−139 °C; −218 °F). It is the first transiting Jupiter analog discovered.[4][5]
The inner two planets were confirmed in 2014, as part of a study validating hundreds of Kepler planets,[7] and the outer two planets were confirmed in 2016.[4] Observations of Kepler-167e using the Spitzer Space Telescope, published in 2019, ruled out significant transit timing variations, making it easier to predict future transits and plan follow-up observations. As a rare example of a long-period transiting gas giant, Kepler-167e is a target of interest for further observations, for example to characterize its atmosphere.[8] As of 2022[update], four transits of planet e have been detected, with both space-based and ground-based observations.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | — | 0.04825±0.00070 | 4.3931539+0.0000048 −0.0000046 |
0 | 88.3+1.6 −1.2° |
1.718±0.070 R🜨 |
| c | — | 0.0684±0.0010 | 7.406106±0.000010 | 0 | 88.48+0.88 −1.0° |
1.674±0.069 R🜨 |
| d | — | 0.1404±0.0020 | 21.80379+0.00013 −0.00018 |
0 | 89.26±0.50° | 1.238±0.064 R🜨 |
| e | 1.01+0.16 −0.15 MJ |
1.883±0.027 | 1071.23205+0.00059 −0.00058 |
0.062+0.104 −0.043[4] |
89.9720+0.0069 −0.0079° |
0.9064±0.0375 RJ |
References edit
- ^ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b "Kepler-167". NASA Exoplanet Archive. Retrieved 7 November 2022.
- ^ a b c d e f Kipping, David M.; Torres, Guillermo; et al. (April 2016). "A Transiting Jupiter Analog". The Astrophysical Journal. 820 (2): 112. arXiv:1603.00042. Bibcode:2016ApJ...820..112K. doi:10.3847/0004-637X/820/2/112. S2CID 1892262.
- ^ a b c d e Chachan, Yayaati; Dalba, Paul A.; et al. (February 2022). "Kepler-167e as a Probe of the Formation Histories of Cold Giants with Inner Super-Earths". The Astrophysical Journal. 926 (1): 62. arXiv:2112.00747. Bibcode:2022ApJ...926...62C. doi:10.3847/1538-4357/ac3ed6. S2CID 244799213.
- ^ a b c d "Kepler-167". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 November 2022.
- ^ Rowe, Jason F.; Bryson, Stephen T.; et al. (March 2014). "Validation of Kepler's Multiple Planet Candidates. III. Light Curve Analysis and Announcement of Hundreds of New Multi-planet Systems". The Astrophysical Journal. 784 (1): 45. arXiv:1402.6534. Bibcode:2014ApJ...784...45R. doi:10.1088/0004-637X/784/1/45. S2CID 119118620.
- ^ Dalba, Paul A.; Tamburo, Patrick (March 2019). "Spitzer Detection of the Transiting Jupiter-analog Exoplanet Kepler-167e". The Astrophysical Journal Letters. 873 (2): L17. arXiv:1903.01478. Bibcode:2019ApJ...873L..17D. doi:10.3847/2041-8213/ab0bb4. S2CID 119473483.
- ^ Perrocheau, Amaury; Esposito, Thomas M.; et al. (December 2022). "A 16 Hour Transit of Kepler-167 e Observed by the Ground-based Unistellar Telescope Network". The Astrophysical Journal Letters. 940 (2): L39. arXiv:2211.01532. Bibcode:2022ApJ...940L..39P. doi:10.3847/2041-8213/aca073. S2CID 253265546.