Temperature
5682 K
5192.2 to 5682
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Stellar HostProfile
Kepler-399
Unclassified star • 740.5 pc
Records
22
literature rows
Planets
3
system count
References
11
distinct source labels
TIC: TIC 172373693
Approximate color
from effective temperature
Canonical Summary
Adopted host values from one source row
Values come from the row with the most populated summary measurements. Missing values stay missing. Ranges and counts describe all source rows.
Stellar source: Morton et al. 2016 • System source: TICv8
Mass
0.94 Msun
0.71 to 0.94
Radius
0.94 Rsun
0.68 to 1.15
Age
3.98 Gyr
0.50 to 3.98
Distance
740.5 pc
single adopted value
Planets
3
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.94 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
Kepler-399
0.94 R☉
System Layout
Known planets
3 planets linked to this host
Kepler-399 b
Transit
◌
Discovery
2014
Period
14.43 days
Radius
0.96 R⊕
Mass
—
Eq. Temp
—
Kepler-399 c
Transit
◌
Discovery
2014
Period
26.68 days
Radius
1.43 R⊕
Mass
—
Eq. Temp
—
Kepler-399 d
Transit
◌
Discovery
2014
Period
58.03 days
Radius
1.89 R⊕
Mass
—
Eq. Temp
—
Kepler-399: A Star and Its Three Worlds
Kepler-399 is a star located 2420 light-years away. It has 0.94 solar masses and 0.94 solar radii, a temperature of 5680 K, and an age of 3.98 billion years. Three planets are known to orbit this host.
Kepler-399 b is a Sub-Earth with a radius of 0.96 Earth radii and an orbital period of 14.4 days. Kepler-399 c is classified as Earth-like, with a radius of 1.43 Earth radii and a period of 26.7 days. Kepler-399 d, the largest of the three at 1.89 Earth radii, is a Super-Earth with a period of 58 days. All three were discovered in 2014 by the transit method, which detects a planet as it passes in front of its star and causes a small dip in observed brightness.
Among these listed planets, Kepler-399 b has the shortest year and the smallest radius. Kepler-399 c has the second-shortest year and the second-smallest radius. Kepler-399 d has the longest year and the largest radius.
Provenance
Underlying measurements and references
Evidence Summary
Rows
22
Stellar refs
10
System refs
1
Distancestable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Surface Gravitydisputed
Metallicitydisputed