Key parameters at a glance
- A radius of 1.50 Earth radii
- A mass of 2.86 Earth masses
- Surface gravity around 1.27 g
- An orbital period of 2.152 days
- Semi-major axis 0.0308 AU
- Equilibrium temperature 1,136 K (863 °C)
- Distance from Earth 1,069.08 light-years
- Earth Similarity Index 0.260
- Travel time at Voyager 1 speed 18,853,294 years
- Almost certainly tidally locked to its host star given the close orbit
4 siblings around K2-268
K2-268 b shares its host star with 4 other confirmed planets. Side-by-side measurements below.
K2-268 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#748of 1176
top 63.5%
This planet
1.50R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-268 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.50 | 11.21 |
| Mass (M⊕) | 1.00 | 2.86 | 317.83 |
| Density (g/cm³) | 5.51 | 4.66 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.27 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 444037742
Gaia DR2
Gaia DR2 604743013163971072
Gaia DR3
Gaia DR3 604743013163971072
System
K2-268
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.15 Earth days (0.6% of a terrestrial year) at a mean orbital distance of 0.0308 AU.
Transit Fingerprint
Depth
0.040 %
Duration
1.970 h
Impact parameter b
0.420
Rp / R★
0.017500
Transit midpoint (BJD)
2,457,143.6543
Photometric dip
Transit produces a flux drop of 398 ppm lasting ≈ 1.97 h.
Extended Orbital Architecture
Planet / star radius ratio
0.017500
Semi-major axis / stellar radius
7.760
Impact parameter (b)
0.420
Transit mid-time (BJD)
2,457,143.6543
Angular separation (arcsec)
0.09400
Eq. Temperature
1,136K
(863 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.260
0 = alien, 1 = Earth-identical
Insufficient insolation data — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Livingston et al. 2018Instrument
Kepler CCD Array
Publication
2018-12
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-268
Spectral Class
K-type orange
Effective Temperature
5,106 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.780 R☉
Stellar Mass
0.840 M☉
Metallicity [Fe/H]
0.03
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
2.299 g/cm³
Rotation period
24.87 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.022 mas
Total Proper Motion
8.195 mas/yr
PM Right Ascension
-8.19 mas/yr
PM Declination
0.12 mas/yr
Galactic Cartesian (pc)
x = -0.676 · y = 0.707 · z = 0.205
Equatorial (J2000)
RA 133.70949° · Dec 11.84827°
Galactic ℓ, b
216.073° · 32.703°
Ecliptic λ, β
132.779° · -5.338°
HTM-20 index
-1890003543
Similar Worlds
Kepler-1968 b
Super-Earth · K-type orange
Radius 1.50 R⊕ · 2,449.2 ly
TOI-1807 b
Super-Earth · K-type orange
Radius 1.50 R⊕ · 138.9 ly
TOI-2345 b
Super-Earth · K-type orange
Radius 1.50 R⊕ · 266.3 ly
Kepler-828 b
Super-Earth · K-type orange
Radius 1.51 R⊕ · 1,876.4 ly
KMT-2021-BLG-0912L b
Super-Earth · K-type orange
Radius 1.49 R⊕ · 18,134.3 ly
Kepler-1324 b
Super-Earth · K-type orange
Radius 1.51 R⊕ · 1,571.0 ly