Key parameters at a glance
- A radius of 11.80 Earth radii
- A mass of 321.01 Earth masses
- Surface gravity around 2.30 g
- An orbital period of 20.273 days
- Semi-major axis 0.1415 AU
- Equilibrium temperature 696 K (423 °C)
- Distance from Earth 1,348.95 light-years
- Earth Similarity Index 0.221
- Travel time at Voyager 1 speed 23,788,765 years
K2-115 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1558of 1771
top 87.9%
This planet
11.80R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | K2-115 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.80 | 11.21 |
| Mass (M⊕) | 1.00 | 321.01 | 317.83 |
| Density (g/cm³) | 5.51 | 1.07 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.30 | 2.53 |
| Insolation (S⊕) | 1.00 | 20.44 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 321.007 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 7020254
Gaia DR2
Gaia DR2 650778499868023296
Gaia DR3
Gaia DR3 650778499868023296
System
K2-115
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 20.27 Earth days (5.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1415 AU.
Transit Fingerprint
Depth
1.603 %
Duration
3.874 h
Impact parameter b
0.655
Rp / R★
0.126590
Transit midpoint (BJD)
2,457,522.0701
Photometric dip
Transit produces a flux drop of 16,030 ppm lasting ≈ 3.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.126590
Semi-major axis / stellar radius
35.620
Impact parameter (b)
0.655
RV semi-amplitude (K)
80.000 m/s
Transit mid-time (BJD)
2,457,522.0701
Long. of periastron (ω)
137.00°
Angular separation (arcsec)
0.34200
Eq. Temperature
696K
(423 °C)
Insolation (S⊕)
20.44
Earth = 1.00
Earth Similarity (ESI)
0.221
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
Shporer et al. 2017Instrument
Kepler CCD Array
Publication
2017-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2017 at K2 (12 shown).
Host System: K2-115
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,870 K — hotter than the Sun (5,778 K)
Estimated Age
2.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.855 R☉
Stellar Mass
0.918 M☉
Metallicity [Fe/H]
-0.20
Extended Stellar Properties
Surface gravity (log g)
4.538 dex
Stellar density
2.080 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
2.389 mas
Total Proper Motion
26.677 mas/yr
PM Right Ascension
15.56 mas/yr
PM Declination
-21.67 mas/yr
Galactic Cartesian (pc)
x = -0.582 · y = 0.785 · z = 0.213
Equatorial (J2000)
RA 126.55350° · Dec 12.28185°
Galactic ℓ, b
212.274° · 26.517°
Ecliptic λ, β
125.868° · -6.722°
HTM-20 index
7041805
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