Key parameters at a glance
- A radius of 3.77 Earth radii
- A mass of 25.20 Earth masses
- Surface gravity around 1.77 g
- An orbital period of 19.306 days
- Semi-major axis 0.1370 AU
- Equilibrium temperature 649 K (376 °C)
- Distance from Earth 888.32 light-years
- Earth Similarity Index 0.353
- Travel time at Voyager 1 speed 15,665,496 years
K2-10 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#62of 1978
top 3.1%
This planet
3.77R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-10 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.77 | 11.21 |
| Mass (M⊕) | 1.00 | 25.20 | 317.83 |
| Density (g/cm³) | 5.51 | 2.36 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.77 | 2.53 |
| Insolation (S⊕) | 1.00 | 42.10 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 25.200 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 363573185
Gaia DR2
Gaia DR2 3798690151434945280
Gaia DR3
Gaia DR3 3798690151434945280
System
K2-10
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 19.31 Earth days (5.3% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1370 AU.
Transit Fingerprint
Depth
0.169 %
Duration
3.806 h
Impact parameter b
0.400
Rp / R★
0.037959
Transit midpoint (BJD)
2,456,819.5794
Photometric dip
Transit produces a flux drop of 1,691 ppm lasting ≈ 3.81 h.
Extended Orbital Architecture
Planet / star radius ratio
0.037959
Semi-major axis / stellar radius
28.700
Impact parameter (b)
0.400
RV semi-amplitude (K)
7.300 m/s
Transit mid-time (BJD)
2,456,819.5794
Angular separation (arcsec)
0.50300
Eq. Temperature
649K
(376 °C)
Insolation (S⊕)
42.10
Earth = 1.00
Earth Similarity (ESI)
0.353
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
Montet et al. 2015Instrument
Kepler CCD Array
Publication
2015-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2015 at K2 (12 shown).
Host System: K2-10
Spectral Class
F-type yellow-white
Effective Temperature
5,533 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.956 R☉
Stellar Mass
0.880 M☉
Metallicity [Fe/H]
-0.07
Extended Stellar Properties
Surface gravity (log g)
4.470 dex
Stellar density
1.508 g/cm³
Systemic radial velocity
8.20 km/s
Rotational v·sin i
1.50 km/s
Activity index (log R'HK)
-5.093
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.643 mas
Total Proper Motion
72.641 mas/yr
PM Right Ascension
-72.60 mas/yr
PM Declination
-2.51 mas/yr
Galactic Cartesian (pc)
x = -0.990 · y = 0.137 · z = 0.030
Equatorial (J2000)
RA 172.12165° · Dec 1.69062°
Galactic ℓ, b
261.428° · 57.717°
Ecliptic λ, β
172.093° · -1.572°
HTM-20 index
-214034828
Similar Worlds
Kepler-873 b
Sub-Neptune · F-type yellow-white
Radius 3.75 R⊕ · 3,855.9 ly
DMPP-6 c
Sub-Neptune · F-type yellow-white
Radius 3.74 R⊕ · 178.2 ly
Kepler-627 b
Sub-Neptune · F-type yellow-white
Radius 3.73 R⊕ · 3,210.4 ly
Kepler-937 b
Sub-Neptune · F-type yellow-white
Radius 3.72 R⊕ · 5,125.4 ly
Kepler-79 c
Sub-Neptune · F-type yellow-white
Radius 3.72 R⊕ · 3,329.1 ly
Kepler-234 b
Sub-Neptune · F-type yellow-white
Radius 3.70 R⊕ · 5,652.6 ly