Key parameters at a glance
- A radius of 2.59 Earth radii
- A mass of 15.90 Earth masses
- Surface gravity around 2.37 g
- An orbital period of 13.864 days
- Semi-major axis 0.1021 AU
- Equilibrium temperature 638 K (365 °C)
- Distance from Earth 379.89 light-years
- Earth Similarity Index 0.425
- Travel time at Voyager 1 speed 6,699,306 years
- Almost certainly tidally locked to its host star given the close orbit
K2-110 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1042of 1978
top 52.6%
This planet
2.59R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-110 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.59 | 11.21 |
| Mass (M⊕) | 1.00 | 15.90 | 317.83 |
| Density (g/cm³) | 5.51 | 5.02 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.37 | 2.53 |
| Insolation (S⊕) | 1.00 | 27.70 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 15.900 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 287333762
Gaia DR2
Gaia DR2 3613175223837135616
Gaia DR3
Gaia DR3 3613175223837135616
System
K2-110
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 13.86 Earth days (3.8% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1021 AU.
Transit Fingerprint
Depth
0.136 %
Duration
3.220 h
Impact parameter b
0.340
Rp / R★
0.033300
Transit midpoint (BJD)
2,457,275.3299
Photometric dip
Transit produces a flux drop of 1,361 ppm lasting ≈ 3.22 h.
Extended Orbital Architecture
Planet / star radius ratio
0.033300
Semi-major axis / stellar radius
30.800
Impact parameter (b)
0.340
RV semi-amplitude (K)
5.250 m/s
Transit mid-time (BJD)
2,457,275.3299
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.87600
Eq. Temperature
638K
(365 °C)
Insolation (S⊕)
27.70
Earth = 1.00
Earth Similarity (ESI)
0.425
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.
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
Osborn et al. 2017Instrument
Kepler CCD Array
Publication
2017-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2017 at K2 (12 shown).
Host System: K2-110
Spectral Class
K-type orange
Effective Temperature
5,010 K — cooler than the Sun (5,778 K)
Estimated Age
8.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.713 R☉
Stellar Mass
0.738 M☉
Metallicity [Fe/H]
-0.34
Extended Stellar Properties
Surface gravity (log g)
4.610 dex
Stellar density
3.515 g/cm³
Systemic radial velocity
-21.63 km/s
Rotational v·sin i
0.10 km/s
Activity index (log R'HK)
-5.063
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
8.557 mas
Total Proper Motion
111.656 mas/yr
PM Right Ascension
45.13 mas/yr
PM Declination
-102.13 mas/yr
Galactic Cartesian (pc)
x = -0.868 · y = -0.449 · z = -0.213
Equatorial (J2000)
RA 207.34974° · Dec -12.28492°
Galactic ℓ, b
324.430° · 48.153°
Ecliptic λ, β
209.769° · -0.954°
HTM-20 index
-802084527
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