Kepler-445

Kepler-445
Observation data
Epoch J2000      Equinox ICRS
Constellation Cygnus
Right ascension 19h 54m 56.65923s
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
Distance401 ± 2 ly
(122.9 ± 0.7 pc)
Details
Mass0.334+0.080
−0.059 M☉
Radius0.347+0.068
−0.049 R☉
Luminosity (bolometric)0.0115 L☉
Temperature3219+89
−63 K
Metallicity [Fe/H]+0.27 dex
Other designations
Kepler-445, KOI-2704, KIC 9730163, TIC 268060194, 2MASS J19545665+4629548
Database references
SIMBADdata
Exoplanet Archivedata

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🜨.

The Kepler-445 planetary system
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

  1. ↑ 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.
  2. 1 2 3 4 5 6 7 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.
  3. 1 2 "Kepler-445". NASA Exoplanet Archive. Retrieved 24 May 2023.
  4. 1 2 3 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.
  5. ↑ Muirhead, Philip S.; Becker, Juliette; Feiden, Gregory A.; Rojas-Ayala, Bárbara; Vanderburg, Andrew; Price, Ellen M.; Thorp, Rachel; Law, Nicholas M.; Riddle, Reed; Baranec, Christoph; Hamren, Katherine; Schlawin, Everett; Covey, Kevin R.; Johnson, John Asher; Lloyd, James P. (2014). "Characterizing the Cool KOIs. VI. H- and K-band Spectra of Kepler M Dwarf Planet-candidate Hosts". The Astrophysical Journal Supplement Series. 213 (1): 5. arXiv:1406.2718. Bibcode:2014ApJS..213....5M. doi:10.1088/0067-0049/213/1/5.
  6. 1 2 3 4 "Kepler-445". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 May 2023.
  7. 1 2 3 4 5 6 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.
  8. ↑ "[...] all of the planets are likely too hot to be located within their host stars’ habitable zones [...]": 8 
  9. ↑ "Kepler Objects of Interest".