Kepler-421
In this article, we will delve into the fascinating world of Kepler-421, exploring its many aspects and facets. From its origin to its relevance today, Kepler-421 has been the subject of interest and debate in numerous contexts and disciplines. Throughout these pages, we will examine its impact on society, its evolution over time and its importance in different areas. Without a doubt, Kepler-421 has left an indelible mark on history and continues to be a source of study and reflection today.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 53m 01.6405s[1] |
| Declination | 45° 5′ 15.977″[1] |
| Apparent magnitude (V) | 13.56±0.04[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G7V or K9V[3] |
| Astrometry | |
| Proper motion (μ) | RA: −3.889(18) mas/yr[1] Dec.: −20.675(19) mas/yr[1] |
| Parallax (π) | 2.9019±0.0151 mas[1] |
| Distance | 1,124 ± 6 ly (345 ± 2 pc) |
| Details | |
| Mass | 0.76[4] M☉ |
| Radius | 0.83+0.04 −0.03[5] R☉ |
| Luminosity | 0.451[6] L☉ |
| Surface gravity (log g) | 4.54[4] cgs |
| Temperature | 5,308±50[2] K |
| Metallicity | −0.25±0.08[2] dex |
| Rotation | 28.5±0.3 d[2] |
| Rotational velocity (v sin i) | 1.5±0.5[4] km/s |
| Age | 14.38[4] Gyr |
| Other designations | |
| Gaia DR2 2106891671567353728, KOI-1274, KIC 8800954, 2MASS J18530163+4505159[7] | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-421 (KOI-1274 A) is a yellow main sequence star, being of spectral class G7V. Orange star of spectral class K9V (KOI-1274 B), projected on sky plane just 1.085″ away, is not physically associated to it.[3] The distance to star KOI-1274 A is approximately 1150 light-years, and to KOI-1274 B is about 1900 light-years.
Planetary system
Kepler-421 has an exoplanet (Kepler-421b), which is notable for its position near the snow line.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | — | 1.219+0.089 −0.106 |
704.20±0.01 | 0.041+0.095 −0.034 |
89.965+0.024 −0.031° |
0.411+0.021 −0.016 RJ |
References
- ^ a b c d 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 c d Kipping, D. M.; Torres, G.; Buchhave, L. A.; Kenyon, S. J.; Henze, C.; Isaacson, H.; Kolbl, R.; Marcy, G. W.; Bryson, S. T.; Stassun, K.; Bastien, F. (9 October 2014). "Discovery of a Transiting Planet Near the Snow-Line". The Astrophysical Journal. 795 (1): 25. arXiv:1407.4807. Bibcode:2014ApJ...795...25K. doi:10.1088/0004-637X/795/1/25. S2CID 119240746.
- ^ a b Atkinson, Dani; Baranec, Christoph; Ziegler, Carl; Law, Nicholas; Riddle, Reed; Morton, Tim (2016), "Probability of the Physical Association of 104 Blended Companions To Kepler Objects of Interest Using Visible and Near-Infrared Adaptive Optics Photometry", The Astronomical Journal, 153: 25, arXiv:1609.09512, doi:10.3847/1538-3881/153/1/25, S2CID 119307017
- ^ a b c d Brewer, John M.; Fischer, Debra A. (2018). "Spectral Properties of Cool Stars: Extended Abundance Analysis of Kepler Objects of Interest". The Astrophysical Journal Supplement Series. 237 (2): 38. arXiv:1804.00673. Bibcode:2018ApJS..237...38B. doi:10.3847/1538-4365/aad501. S2CID 119431797.
- ^ a b Herman, Miranda K.; Zhu, Wei; Wu, Yanqin (2019), "Revisiting the Long-period Transiting Planets from Kepler", The Astronomical Journal, 157 (6): 248, arXiv:1901.01974, Bibcode:2019AJ....157..248H, doi:10.3847/1538-3881/ab1f70, S2CID 119550672
- ^ 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.
- ^ "Kepler-421". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ Kawahara, Hajime; Masuda, Kento (2019), "Transiting Planets near the Snow Line from Kepler. I. Catalog", The Astronomical Journal, 157 (6): 218, arXiv:1904.04980, Bibcode:2019AJ....157..218K, doi:10.3847/1538-3881/ab18ab, S2CID 119099510
- ^ Planet Kepler-421 b at exoplanets.eu
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