Key parameters at a glance
- A radius of 0.74 Earth radii
- A mass of 0.33 Earth masses
- Surface gravity around 0.60 g
- An orbital period of 5.774 days
- Semi-major axis 0.0510 AU
- Equilibrium temperature 529 K (256 °C)
- Distance from Earth 598.06 light-years
- Earth Similarity Index 0.560
- Travel time at Voyager 1 speed 10,546,716 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-125
Kepler-125 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-125 b | Sub-Neptune | 2.37 | 6.21 | 4.164 | 590 | 2014 |
| Kepler-125 c this | Rocky Terrestrial | 0.74 | 0.33 | 5.774 | 529 | 2014 |
Kepler-125 c Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#514of 570
top 90.0%
This planet
0.74R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-125 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 0.74 | 11.21 |
| Mass (M⊕) | 1.00 | 0.33 | 317.83 |
| Density (g/cm³) | 5.51 | 4.47 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.60 | 2.53 |
| Insolation (S⊕) | 1.00 | 16.81 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 273873718
Gaia DR2
Gaia DR2 2086439488284337536
Gaia DR3
Gaia DR3 2086439488284337536
System
Kepler-125
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.77 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0510 AU.
Transit Fingerprint
Depth
0.027 %
Duration
1.878 h
Impact parameter b
0.120
Rp / R★
0.014960
Transit midpoint (BJD)
2,454,965.9612
Photometric dip
Transit produces a flux drop of 265 ppm lasting ≈ 1.88 h.
Extended Orbital Architecture
Planet / star radius ratio
0.014960
Semi-major axis / stellar radius
17.100
Impact parameter (b)
0.120
Transit mid-time (BJD)
2,454,965.9612
Angular separation (arcsec)
0.27800
Eq. Temperature
529K
(256 °C)
Insolation (S⊕)
16.81
Earth = 1.00
Earth Similarity (ESI)
0.560
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-125
Spectral Class
M-type red dwarf
Effective Temperature
3,810 K — cooler than the Sun (5,778 K)
Estimated Age
1.09 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.512 R☉
Stellar Mass
0.542 M☉
Metallicity [Fe/H]
-0.14
Extended Stellar Properties
Surface gravity (log g)
4.744 dex
Stellar density
4.682 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
5.425 mas
Total Proper Motion
10.631 mas/yr
PM Right Ascension
0.66 mas/yr
PM Declination
10.61 mas/yr
Galactic Cartesian (pc)
x = 0.319 · y = -0.594 · z = 0.739
Equatorial (J2000)
RA 298.25811° · Dec 47.60500°
Galactic ℓ, b
81.593° · 10.219°
Ecliptic λ, β
321.805° · 66.037°
HTM-20 index
1196148368
Similar Worlds
Barnard c
Rocky Terrestrial · M-type red dwarf
Radius 0.74 R⊕ · 6.0 ly
Kepler-42 c
Rocky Terrestrial · M-type red dwarf
Radius 0.73 R⊕ · 130.7 ly
TRAPPIST-1 h
Rocky Terrestrial · M-type red dwarf
Radius 0.76 R⊕ · 40.5 ly
Barnard b
Rocky Terrestrial · M-type red dwarf
Radius 0.72 R⊕ · 6.0 ly
Kepler-42 b
Rocky Terrestrial · M-type red dwarf
Radius 0.78 R⊕ · 130.7 ly
GJ 367 b
Rocky Terrestrial · M-type red dwarf
Radius 0.70 R⊕ · 30.7 ly