| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19 54 56.65923 |
| Declination | +46° 29′ 54.7936″ |
| Apparent magnitude (V) | 18.19 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M4V |
| Apparent magnitude (G) | 16.685±0.003 |
| Apparent magnitude (J) | 13.542±0.029 |
| Apparent magnitude (H) | 12.929±0.035 |
| Apparent magnitude (K) | 12.610±0.028 |
| Astrometry | |
| Proper motion (μ) | RA: 41.465 mas/yr Dec.: 132.351 mas/yr |
| Parallax (π) | 8.1366 ± 0.0457 mas |
| Distance | 401 ± 2 ly (122.9 ± 0.7 pc) |
| Details | |
| Mass | 0.334+0.080 −0.059 M☉ |
| Radius | 0.347+0.068 −0.049 R☉ |
| Luminosity (bolometric) | 0.0115 L☉ |
| Temperature | 3219+89 −63 K |
| Metallicity | +0.27 dex |
| Other designations | |
| Kepler-445, KOI-2704, KIC 9730163, TIC 268060194, 2MASS J19545665+4629548 | |
| Database references | |
| SIMBAD | data |
Kepler-445 is a red dwarf star located 401 light-years (123 parsecs) away in the constellation Cygnus. It hosts three known exoplanets, discovered by the transit method using data from the Kepler space telescope and confirmed in 2015. None of the planets orbit within the habitable zone.
Planetary system
Kepler-445b, c, and d orbit Kepler-445 every 3, 5, and 8 days, and have equilibrium temperatures of 401 K (128 °C; 262 °F), 341 K (68 °C; 154 °F), and 305 K (32 °C; 89 °F), respectively. With a radius of 2.72 times that of Earth, Kepler-445c is likely a mini-Neptune with a volatile-rich composition, and has been compared to GJ 1214 b. Kepler-445d is only slightly larger than the Earth, with a radius of 1.33 R🜨.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | — | 0.023656 | 2.98416640+0.00000891 −0.00000936 |
0.02+0.16 −0.02 |
89.74+0.18 −0.28° |
1.74+0.29 −0.28 R🜨 |
| c | — | 0.033427 | 4.87122714+0.00000636 −0.00000638 |
0.01+0.16 −0.01 |
89.91+0.07 −0.10° |
2.72+0.44 −0.43 R🜨 |
| d | — | 0.047121 | 8.15272856+0.00006453 −0.00007041 |
0.01+0.16 −0.01 |
89.61+0.27 −0.25° |
1.33+0.25 −0.23 R🜨 |
References
- "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
- ^ 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.
- ^ "Kepler-445". NASA Exoplanet Archive. Retrieved 24 May 2023.
- ^ "Kepler-445". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 May 2023.
- ^ Mann, Andrew W.; Dupuy, Trent; Muirhead, Philip S.; Johnson, Marshall C.; Liu, Michael C.; Ansdell, Megan; Dalba, Paul A.; Swift, Jonathan J.; Hadden, Sam (2017), "The Gold Standard: Accurate Stellar and Planetary Parameters for Eight Kepler M Dwarf Systems Enabled by Parallaxes", The Astronomical Journal, 153 (6): 267, arXiv:1705.01545, Bibcode:2017AJ....153..267M, doi:10.3847/1538-3881/aa7140, S2CID 119325474
- ^ Muirhead, Philip S.; Mann, Andrew W.; et al. (March 2015). "Kepler-445, Kepler-446 and the Occurrence of Compact Multiples Orbiting Mid-M Dwarf Stars". The Astrophysical Journal. 801 (1): 18. arXiv:1501.01305. Bibcode:2015ApJ...801...18M. doi:10.1088/0004-637X/801/1/18. S2CID 5541362.
- " all of the planets are likely too hot to be located within their host stars’ habitable zones "
- "Kepler Objects of Interest".
| The Kepler-445 system | |
|---|---|
| Stars | |
| Planets | |
| 2015 in space | ||||||
|---|---|---|---|---|---|---|
Space probe launches  |
|    | ||||
| Impact events | ||||||
| Selected NEOs | ||||||
| Exoplanets |
| |||||
| Discoveries |
| |||||
| Comets | ||||||
| Space exploration | ||||||
