Key parameters at a glance
- A radius of 2.37 Earth radii
- A mass of 6.21 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 4.164 days
- Semi-major axis 0.0410 AU
- Equilibrium temperature 590 K (317 °C)
- Distance from Earth 598.06 light-years
- Earth Similarity Index 0.435
- 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 b 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 this | Sub-Neptune | 2.37 | 6.21 | 4.164 | 590 | 2014 |
| Kepler-125 c | Rocky Terrestrial | 0.74 | 0.33 | 5.774 | 529 | 2014 |
Kepler-125 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1375of 1978
top 69.5%
This planet
2.37R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-125 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.37 | 11.21 |
| Mass (M⊕) | 1.00 | 6.21 | 317.83 |
| Density (g/cm³) | 5.51 | 2.56 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 33.18 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 273873718
Gaia DR2
Gaia DR2 2086439488284337536
Gaia DR3
Gaia DR3 2086439488284337536
System
Kepler-125
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.16 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0410 AU.
Transit Fingerprint
Depth
0.253 %
Duration
1.798 h
Impact parameter b
0.030
Rp / R★
0.044000
Transit midpoint (BJD)
2,455,004.0868
Photometric dip
Transit produces a flux drop of 2,529 ppm lasting ≈ 1.80 h.
Extended Orbital Architecture
Planet / star radius ratio
0.044000
Semi-major axis / stellar radius
14.890
Impact parameter (b)
0.030
Transit mid-time (BJD)
2,455,004.0868
Angular separation (arcsec)
0.22400
Eq. Temperature
590K
(317 °C)
Insolation (S⊕)
33.18
Earth = 1.00
Earth Similarity (ESI)
0.435
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
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