Key parameters at a glance
- A radius of 1.69 Earth radii
- A mass of 7.90 Earth masses
- Surface gravity around 2.77 g
- An orbital period of 0.369 days
- Semi-major axis 0.0094 AU
- Equilibrium temperature 2,223 K (1950 °C)
- Distance from Earth 497.42 light-years
- Earth Similarity Index 0.106
- Travel time at Voyager 1 speed 8,771,953 years
- Almost certainly tidally locked to its host star given the close orbit
K2-131 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#415of 1176
top 35.2%
This planet
1.69R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-131 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.69 | 11.21 |
| Mass (M⊕) | 1.00 | 7.90 | 317.83 |
| Density (g/cm³) | 5.51 | 8.80 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.77 | 2.53 |
| Insolation (S⊕) | 1.00 | 4,070.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 7.900 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 176868951
Gaia DR2
Gaia DR2 3580920878437938688
Gaia DR3
Gaia DR3 3580920878437938688
System
K2-131
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 8.9 hours long on a nearly circular orbit at a mean orbital distance of 0.0094 AU.
Transit Fingerprint
Depth
0.076 %
Duration
1.003 h
Impact parameter b
0.400
Rp / R★
0.017200
Transit midpoint (BJD)
2,457,582.9360
Photometric dip
Transit produces a flux drop of 756 ppm lasting ≈ 1.00 h.
Extended Orbital Architecture
Planet / star radius ratio
0.017200
Semi-major axis / stellar radius
3.000
Impact parameter (b)
0.400
RV semi-amplitude (K)
8.000 m/s
Transit mid-time (BJD)
2,457,582.9360
Angular separation (arcsec)
0.06140
Eq. Temperature
2,223K
(1950 °C)
Insolation (S⊕)
4,070.00
Earth = 1.00
Earth Similarity (ESI)
0.106
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Dai et al. 2017Instrument
Kepler CCD Array
Publication
2017-12
Observation locale
Space
Discovery cohort
Planets confirmed in 2017 at K2 (12 shown).
Host System: K2-131
Spectral Class
K-type orange
Effective Temperature
5,120 K — cooler than the Sun (5,778 K)
Estimated Age
5.30 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.760 R☉
Stellar Mass
0.803 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.610 dex
Stellar density
2.710 g/cm³
Systemic radial velocity
-5.27 km/s
Rotational v·sin i
4.30 km/s
Rotation period
9.19 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
6.529 mas
Total Proper Motion
39.849 mas/yr
PM Right Ascension
-39.49 mas/yr
PM Declination
-5.37 mas/yr
Galactic Cartesian (pc)
x = -0.984 · y = -0.047 · z = -0.170
Equatorial (J2000)
RA 182.75140° · Dec -9.76524°
Galactic ℓ, b
286.681° · 51.826°
Ecliptic λ, β
186.422° · -7.863°
HTM-20 index
683999477
Similar Worlds
Kepler-1148 b
Super-Earth · K-type orange
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K2-381 d
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