 Artist's impression of the planet Kepler-78b around Kepler-78 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 34m 58.01374s[2] |
| Declination | +44° 26′ 53.9602″[2] |
| Apparent magnitude (V) | 11.72[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | K2.5V[4] |
| Astrometry | |
| Proper motion (μ) | RA: +38.195 mas/yr[2] Dec.: −16.309 mas/yr[2] |
| Parallax (π) | 8.0085±0.0104 mas[2] |
| Distance | 407.3 ± 0.5 ly (124.9 ± 0.2 pc) |
| Details | |
| Mass | 0.779+0.032 −0.046[5] M☉ |
| Radius | 0.7475+0.0077 −0.0078[5] R☉ |
| Luminosity | 0.31[6] L☉ |
| Surface gravity (log g) | 4.51[6] cgs |
| Temperature | 5,058±50[5] K |
| Metallicity [Fe/H] | −0.18±0.08[5] dex |
| Rotation | 12.53 days[7] |
| Rotational velocity (v sin i) | 3.1[8] km/s |
| Age | 240[7] Myr |
| Other designations | |
| Kepler-78, KIC 8435766, TYC 3147-188-1, 2MASS J19345800+4426539[9] | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-78 (formerly known as KIC 8435766) is a 12th magnitude star 407 light-years (125 parsecs) away in the constellation Cygnus. Initially classified as an eclipsing binary with orbital period 0.710015 days,[10] it was later re-classified as a single star with significant interaction between star magnetosphere and close-in planet.[11] The radius of the star is of about 74% of the Sun, and the effective temperature is about 5,100 K.
Planetary system
The Kepler-78 planetary system is composed of one known planet called Kepler-78b, a planet slightly bigger than Earth with an extremely close orbit to the parent star. The orbital period of this planet is about 8.5 hours because of its proximity to its star. While it has a similar density to the Earth (at 5.57 g/cm3), its surface temperature is about 1300 to 1500 K.[12]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.68±0.27 M🜨 | 0.00901+0.00012 −0.00019 |
0.35500745±0.00000008 | 0 | 75.2+2.6 −2.1° |
1.201±0.028 R🜨 |
References
- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e 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.
- ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
- ^ Frasca, A.; Molenda-Żakowicz, J.; Alonso-Santiago, J.; Catanzaro, G.; De Cat, P.; Fu, J. N.; Zong, W.; Wang, J. X.; Cang, T.; Wang, J. T. (2022). "Characterization of Kepler targets based on medium-resolution LAMOST spectra analyzed with ROTFIT". Astronomy and Astrophysics. 664: A78. arXiv:2205.04757. Bibcode:2022A&A...664A..78F. doi:10.1051/0004-6361/202243268.
- ^ a b c d e Bonomo, A. S.; Dumusque, X.; et al. (April 2023). "Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems". Astronomy & Astrophysics. arXiv:2304.05773. doi:10.1051/0004-6361/202346211. S2CID 261556620.
- ^ a b Brown, E. L.; Jeffers, S. V.; Marsden, S. C.; Morin, J.; Boro Saikia, S.; Petit, P.; Jardine, M. M.; See, V.; Vidotto, A. A.; Mengel, M. W.; Dahlkemper, M. N.; the BCool Collaboration (2022). "Linking chromospheric activity and magnetic field properties for late-type dwarf stars". Monthly Notices of the Royal Astronomical Society. 514 (3): 4300. arXiv:2205.03108. Bibcode:2022MNRAS.514.4300B. doi:10.1093/mnras/stac1291.
- ^ a b Ye, Lifei; Bi, Shaolan; Zhang, Jinghua; Sun, Tiancheng; Long, Liu; Ge, Zhishuai; Li, Tanda; Zhang, Xianfei; Chen, Xunzhou; Li, Yaguang; Zhou, Jianzhao; Xiang, Maosheng (2024). "Relations of Rotation and Chromospheric Activity to Stellar Age for FGK Dwarfs from Kepler and LAMOST". The Astrophysical Journal Supplement Series. 271 (1): 19. arXiv:2401.15438. Bibcode:2024ApJS..271...19Y. doi:10.3847/1538-4365/ad1eee.
- ^ Brewer, John M.; Fischer, Debra A.; Valenti, Jeff A.; Piskunov, Nikolai (2016). "Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-search Stars". The Astrophysical Journal Supplement Series. 225 (2): 32. arXiv:1606.07929. Bibcode:2016ApJS..225...32B. doi:10.3847/0067-0049/225/2/32.
- ^ "Kepler-78". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-05-15.
- ^ Slawson, Robert W.; Prša, Andrej; Welsh, William F.; Orosz, Jerome A.; Rucker, Michael; Batalha, Natalie; Doyle, Laurance R.; Engle, Scott G.; Conroy, Kyle; Coughlin, Jared; Gregg, Trevor A.; Fetherolf, Tara; Short, Donald R.; Windmiller, Gur; Fabrycky, Daniel C.; Howell, Steve B.; Jenkins, Jon M.; Uddin, Kamal; Mullally, F.; Seader, Shawn E.; Thompson, Susan E.; Sanderfer, Dwight T.; Borucki, William; Koch, David (2011). "Kepler Eclipsing Binary Stars. II. 2165 Eclipsing Binaries in the Second Data Release". The Astronomical Journal. 142 (5): 160. arXiv:1103.1659. Bibcode:2011AJ....142..160S. doi:10.1088/0004-6256/142/5/160.
- ^ Strugarek, A.; Brun, A. S.; Donati, J.-F.; Moutou, C.; Réville, V. (2019). "Chasing Star–Planet Magnetic Interactions: The Case of Kepler-78". The Astrophysical Journal. 881 (2): 136. arXiv:1907.01020. Bibcode:2019ApJ...881..136S. doi:10.3847/1538-4357/ab2ed5. S2CID 195776491.
- ^ Pepe, Francesco; Cameron, Andrew Collier; Latham, David W.; Molinari, Emilio; Udry, Stéphane; Bonomo, Aldo S.; Buchhave, Lars A.; Charbonneau, David; Cosentino, Rosario; Dressing, Courtney D.; Dumusque, Xavier; Figueira, Pedro; Fiorenzano, Aldo F. M.; Gettel, Sara; Harutyunyan, Avet; Haywood, Raphaëlle D.; Horne, Keith; Lopez-Morales, Mercedes; Lovis, Christophe; Malavolta, Luca; Mayor, Michel; Micela, Giusi; Motalebi, Fatemeh; Nascimbeni, Valerio; Phillips, David; Piotto, Giampaolo; Pollacco, Don; Queloz, Didier; Rice, Ken; et al. (2013). "An Earth-sized planet with an Earth-like density". Nature. 503 (7476): 377–80. arXiv:1310.7987. Bibcode:2013Natur.503..377P. doi:10.1038/nature12768. PMID 24172902. S2CID 4397568.
