Astronomy:Kepler-445
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Short description: Star in the constellation Cygnus
Observation data Equinox J2000.0]] (ICRS) | |
---|---|
Constellation | Cygnus[1] |
Right ascension | 19h 54m 56.65923s[2] |
Declination | +46° 29′ 54.7936″[2] |
Apparent magnitude (V) | 18.19[3] |
Characteristics | |
Evolutionary stage | Main sequence |
Spectral type | M4V[4] |
Apparent magnitude (G) | 16.685±0.003[2] |
Apparent magnitude (J) | 13.542±0.029[4] |
Apparent magnitude (H) | 12.929±0.035[4] |
Apparent magnitude (K) | 12.610±0.028[4] |
Astrometry | |
Proper motion (μ) | RA: 41.465[2] mas/yr Dec.: 132.351[2] mas/yr |
Parallax (π) | 8.1366 ± 0.0457[2] mas |
Distance | 401 ± 2 ly (122.9 ± 0.7 pc) |
Details[5] | |
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 [Fe/H] | +0.27 dex |
Other designations | |
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.[6] None of the planets orbit within the habitable zone.[7]
Planetary system
Kepler-445b, c, and d orbit Kepler-445 every 3, 5, and 8 days,[3] 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.[8] 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.[6] 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[6]° |
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[6]° |
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[6]° |
1.33+0.25 −0.23 R⊕ |
References
- ↑ "Finding the constellation which contains given sky coordinates". 2 August 2008. http://djm.cc/constellation.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 "Kepler-445". NASA Exoplanet Archive. https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-445.
- ↑ 4.0 4.1 4.2 4.3 4.4 "Kepler-445". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-445.
- ↑ 5.0 5.1 Mann, Andrew W.; Dupuy, Trent; Muirhead, Philip S.; Johnson, Marshall C.; Liu, Michael C.; Ansdell, Megan; Dalba, Paul A.; Swift, Jonathan J. et al. (2017), "The Gold Standard: Accurate Stellar and Planetary Parameters for Eight Kepler M Dwarf Systems Enabled by Parallaxes", The Astronomical Journal 153 (6): 267, doi:10.3847/1538-3881/aa7140, Bibcode: 2017AJ....153..267M
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Muirhead, Philip S. 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. doi:10.1088/0004-637X/801/1/18. Bibcode: 2015ApJ...801...18M.
- ↑ "[...] all of the planets are likely too hot to be located within their host stars’ habitable zones [...]"[6]:8
- ↑ "Kepler Objects of Interest". http://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=cumulative&constraint=koi_pdisposition+like+%27CANDIDATE%27.
![]() | Original source: https://en.wikipedia.org/wiki/Kepler-445.
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