Key parameters at a glance
- A radius of 1.30 Earth radii
- A mass of 2.24 Earth masses
- Surface gravity around 1.33 g
- An orbital period of 9.916 days
- Distance from Earth 613.74 light-years
- Earth Similarity Index 0.939
- Travel time at Voyager 1 speed 10,823,376 years
- Almost certainly tidally locked to its host star given the close orbit
K2-102 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#1090of 1176
top 92.6%
This planet
1.30R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-102 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.30 | 11.21 |
| Mass (M⊕) | 1.00 | 2.24 | 317.83 |
| Density (g/cm³) | 5.51 | 5.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.33 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 175262071
Gaia DR2
Gaia DR2 661310756111835392
Gaia DR3
Gaia DR3 661310756111835392
System
K2-102
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.92 Earth days (2.7% of a terrestrial year) on a mildly elliptical path.
Transit Fingerprint
Depth
0.020 %
Duration
2.660 h
Impact parameter b
0.430
Rp / R★
0.017000
Transit midpoint (BJD)
2,457,139.6552
Photometric dip
Transit produces a flux drop of 200 ppm lasting ≈ 2.66 h.
Extended Orbital Architecture
Planet / star radius ratio
0.017000
Semi-major axis / stellar radius
25.300
Impact parameter (b)
0.430
Transit mid-time (BJD)
2,457,139.6552
Long. of periastron (ω)
-1.00°
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.939
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Mann et al. 2017Instrument
Kepler CCD Array
Publication
2017-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-102
Spectral Class
K-type orange
Effective Temperature
4,695 K — cooler than the Sun (5,778 K)
Estimated Age
0.79 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.710 R☉
Stellar Mass
0.770 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
4.534 dex
Stellar density
3.030 g/cm³
Systemic radial velocity
34.85 km/s
Rotational v·sin i
3.00 km/s
Rotation period
11.50 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
5.286 mas
Total Proper Motion
37.384 mas/yr
PM Right Ascension
-34.96 mas/yr
PM Declination
-13.25 mas/yr
Galactic Cartesian (pc)
x = -0.606 · y = 0.720 · z = 0.338
Equatorial (J2000)
RA 130.05590° · Dec 19.77875°
Galactic ℓ, b
205.778° · 32.484°
Ecliptic λ, β
127.279° · 1.373°
HTM-20 index
-1919859963
Similar Worlds
Kepler-1379 b
Super-Earth · K-type orange
Radius 1.30 R⊕ · 3,168.0 ly
Kepler-1254 c
Super-Earth · K-type orange
Radius 1.30 R⊕ · 2,031.4 ly
Kepler-367 b
Super-Earth · K-type orange
Radius 1.30 R⊕ · 613.3 ly
K2-90 c
Super-Earth · K-type orange
Radius 1.30 R⊕ · 437.7 ly
TOI-2076 e
Super-Earth · K-type orange
Radius 1.30 R⊕ · 136.7 ly
Kepler-1254 d
Super-Earth · K-type orange
Radius 1.31 R⊕ · 2,031.4 ly