Kepler-445

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]

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
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 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[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
Kepler-445, KOI-2704, KIC 9730163, TIC 268060194, 2MASS J19545665+4629548[4]
Database references
SIMBAD	data
Exoplanet Archive	data

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_🜨.

The Kepler-445 planetary system^[5]

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🜨