Kepler-421
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.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 53m 01.6406s[1] |
| Declination | 45° 5′ 15.9725″[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: −4.010±0.032[1] mas/yr Dec.: −20.398±0.037[1] mas/yr |
| Parallax (π) | 2.8401 ± 0.0166[1] mas |
| Distance | 1,148 ± 7 ly (352 ± 2 pc) |
| Details | |
| Mass | 0.76[4] M☉ |
| Radius | 0.83+0.04 −0.03[5] R☉ |
| Luminosity | 0.451[1] L☉ |
| Surface gravity (log g) | 4.54[4] cgs |
| Temperature | 5,308±50[2] K |
| Metallicity [Fe/H] | −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 | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Planetary system
Kepler-421 (either KOI-1274 A or KOI-1274 B) has an exoplanet (Kepler-421b), which is notable for its position near the snow line.[7]
| 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
- 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.
- 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.
- {{citation|arxiv=1609.09512|title=PROBABILITY OF PHYSICAL ASSOCIATION OF 104 BLENDED COMPANIONS TO KEPLER OBJECTS OF INTEREST USING VISIBLE AND NEAR-INFRARED ADAPTIVE OPTICS PHOTOMETRY|year=2016
- 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.
- 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, doi:10.3847/1538-3881/ab1f70, S2CID 119550672
- "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, doi:10.3847/1538-3881/ab18ab, S2CID 119099510
- Planet Kepler-421 b at exoplanets.eu
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