Kepler-445

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Kepler-445
Observation data
Epoch J2000        Equinox J2000
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 [4] [2]
Spectral type M4V [5]
Apparent magnitude  (G)16.685±0.003 [2]
Apparent magnitude  (J)13.542±0.029 [6]
Apparent magnitude  (H)12.929±0.035 [6]
Apparent magnitude  (K)12.610±0.028 [6]
Astrometry
Proper motion (μ)RA: 41.465 mas/yr [2]
Dec.: 132.351 mas/yr [2]
Parallax (π)8.1366±0.0457  mas [2]
Distance 401 ± 2  ly
(122.9 ± 0.7  pc)
Details [4]
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
Kepler-445, KOI-2704, KIC 9730163, TIC 268060194, 2MASS J19545665+4629548 [6]
Database references
SIMBAD data
Exoplanet Archive 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. [7] None of the planets orbit within the habitable zone. [8]

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. [9] 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. [7] Kepler-445d is only slightly larger than the Earth, with a radius of 1.33  R🜨.

The Kepler-445 planetary system [4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b—0.0236562.98416640+0.00000891
−0.00000936		0.02+0.16
−0.02		89.74+0.18
−0.28 [7] ° 		1.74+0.29
−0.28  R🜨
c—0.0334274.87122714+0.00000636
−0.00000638		0.01+0.16
−0.01		89.91+0.07
−0.10 [7] ° 		2.72+0.44
−0.43  R🜨
d—0.0471218.15272856+0.00006453
−0.00007041		0.01+0.16
−0.01		89.61+0.27
−0.25 [7] ° 		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 [...]" [7] : 8 
  9. ↑ "Kepler Objects of Interest".
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