Key parameters at a glance
- A radius of 1.58 Earth radii
- A mass of 3.12 Earth masses
- Surface gravity around 1.25 g
- An orbital period of 8.054 days
- Semi-major axis 0.0708 AU
- Distance from Earth 550.07 light-years
- Earth Similarity Index 0.873
- Travel time at Voyager 1 speed 9,700,460 years
- Almost certainly tidally locked to its host star given the close orbit
K2-68 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#603of 1176
top 51.2%
This planet
1.58R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-68 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.58 | 11.21 |
| Mass (M⊕) | 1.00 | 3.12 | 317.83 |
| Density (g/cm³) | 5.51 | 4.35 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.25 | 2.53 |
| Insolation (S⊕) | 1.00 | 41.00 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 38258419
Gaia DR2
Gaia DR2 2614734243939231232
Gaia DR3
Gaia DR3 2614734243939231232
System
K2-68
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.05 Earth days (2.2% of a terrestrial year) at a mean orbital distance of 0.0708 AU.
Transit Fingerprint
Depth
0.067 %
Duration
2.720 h
Impact parameter b
0.090
Rp / R★
0.021100
Transit midpoint (BJD)
2,456,982.3281
Photometric dip
Transit produces a flux drop of 668 ppm lasting ≈ 2.72 h.
Extended Orbital Architecture
Planet / star radius ratio
0.021100
Semi-major axis / stellar radius
19.902
Impact parameter (b)
0.090
Transit mid-time (BJD)
2,456,982.3281
Angular separation (arcsec)
0.42000
Eq. Temperature
—
Insolation (S⊕)
41.00
Earth = 1.00
Earth Similarity (ESI)
0.873
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water). Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Crossfield et al. 2016Instrument
Kepler CCD Array
Publication
2016-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-68
Spectral Class
K-type orange
Effective Temperature
4,746 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.675 R☉
Stellar Mass
0.730 M☉
Metallicity [Fe/H]
-0.21
Extended Stellar Properties
Surface gravity (log g)
4.632 dex
Stellar density
3.285 g/cm³
Systemic radial velocity
18.73 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
5.901 mas
Total Proper Motion
53.375 mas/yr
PM Right Ascension
-52.53 mas/yr
PM Declination
-9.49 mas/yr
Galactic Cartesian (pc)
x = 0.884 · y = -0.431 · z = -0.183
Equatorial (J2000)
RA 334.01955° · Dec -10.56736°
Galactic ℓ, b
49.714° · -49.914°
Ecliptic λ, β
332.088° · 0.174°
HTM-20 index
411061059
Similar Worlds
Kepler-386 c
Super-Earth · K-type orange
Radius 1.58 R⊕ · 2,878.2 ly
K2-191 b
Super-Earth · K-type orange
Radius 1.58 R⊕ · 936.7 ly
Kepler-2000 c
Super-Earth · K-type orange
Radius 1.57 R⊕ · 1,045.6 ly
K2-50 b
Super-Earth · K-type orange
Radius 1.59 R⊕ · 839.7 ly
Kepler-55 d
Super-Earth · K-type orange
Radius 1.59 R⊕ · 1,887.8 ly
Kepler-928 b
Super-Earth · K-type orange
Radius 1.59 R⊕ · 1,659.5 ly