Key parameters at a glance
- A radius of 13.56 Earth radii
- A mass of 295.58 Earth masses
- Surface gravity around 1.61 g
- An orbital period of 6.569 days
- Semi-major axis 0.0680 AU
- Equilibrium temperature 962 K (689 °C)
- Distance from Earth 1,134.75 light-years
- Earth Similarity Index 0.141
- Travel time at Voyager 1 speed 20,011,353 years
K2-140 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#664of 1771
top 37.4%
This planet
13.56R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | K2-140 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.56 | 11.21 |
| Mass (M⊕) | 1.00 | 295.58 | 317.83 |
| Density (g/cm³) | 5.51 | 0.66 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.61 | 2.53 |
| Insolation (S⊕) | 1.00 | 204.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 295.580 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 380255458
Gaia DR2
Gaia DR2 3579426053724051584
Gaia DR3
Gaia DR3 3579426053724051584
System
K2-140
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.57 Earth days (1.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0680 AU.
Transit Fingerprint
Depth
1.557 %
Duration
3.810 h
Impact parameter b
0.420
Rp / R★
0.117000
Transit midpoint (BJD)
2,457,588.2851
Photometric dip
Transit produces a flux drop of 15,570 ppm lasting ≈ 3.81 h.
Extended Orbital Architecture
Planet / star radius ratio
0.117000
Semi-major axis / stellar radius
14.100
Impact parameter (b)
0.420
RV semi-amplitude (K)
104.100 m/s
Transit mid-time (BJD)
2,457,588.2851
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.19500
Eq. Temperature
962K
(689 °C)
Insolation (S⊕)
204.00
Earth = 1.00
Earth Similarity (ESI)
0.141
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
Giles et al. 2018Instrument
Kepler CCD Array
Publication
2018-04
Observation locale
Space
Discovery cohort
Planets confirmed in 2017 at K2 (12 shown).
Host System: K2-140
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,585 K — cooler than the Sun (5,778 K)
Estimated Age
9.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.060 R☉
Stellar Mass
0.960 M☉
Metallicity [Fe/H]
0.10
Extended Stellar Properties
Surface gravity (log g)
4.400 dex
Stellar density
1.133 g/cm³
Systemic radial velocity
1.22 km/s
Rotational v·sin i
3.60 km/s
Rotation period
14.60 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
2.847 mas
Total Proper Motion
9.163 mas/yr
PM Right Ascension
-6.83 mas/yr
PM Declination
6.11 mas/yr
Galactic Cartesian (pc)
x = -0.976 · y = -0.140 · z = -0.167
Equatorial (J2000)
RA 188.13732° · Dec -9.60761°
Galactic ℓ, b
295.184° · 52.980°
Ecliptic λ, β
191.262° · -5.602°
HTM-20 index
-1353358619
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