Key parameters at a glance
- A radius of 2.23 Earth radii
- A mass of 5.60 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 26.271 days
- Equilibrium temperature 492 K (219 °C)
- Distance from Earth 1,069.08 light-years
- Earth Similarity Index 0.525
- 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 f shares its host star with 4 other confirmed planets. Side-by-side measurements below.
K2-268 f Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1622of 1978
top 82.0%
This planet
2.23R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-268 f | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.23 | 11.21 |
| Mass (M⊕) | 1.00 | 5.60 | 317.83 |
| Density (g/cm³) | 5.51 | 2.77 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 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 Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 26.27 Earth days (7.2% of a terrestrial year).
Transit Fingerprint
Depth
0.103 %
Duration
4.620 h
Impact parameter b
0.390
Rp / R★
0.025900
Transit midpoint (BJD)
2,457,142.1917
Photometric dip
Transit produces a flux drop of 1,025 ppm lasting ≈ 4.62 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025900
Semi-major axis / stellar radius
41.410
Impact parameter (b)
0.390
Transit mid-time (BJD)
2,457,142.1917
Eq. Temperature
492K
(219 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.525
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
De Leon et al. 2021Instrument
Kepler CCD Array
Publication
2021-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 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
K2-17 b
Sub-Neptune · K-type orange
Radius 2.23 R⊕ · 408.0 ly
TOI-1346 c
Sub-Neptune · K-type orange
Radius 2.23 R⊕ · 376.5 ly
Kepler-1782 b
Sub-Neptune · K-type orange
Radius 2.23 R⊕ · 997.4 ly
Kepler-1753 b
Sub-Neptune · K-type orange
Radius 2.23 R⊕ · 2,308.2 ly
TOI-1453 c
Sub-Neptune · K-type orange
Radius 2.22 R⊕ · 256.8 ly
Kepler-1701 b
Sub-Neptune · K-type orange
Radius 2.22 R⊕ · 1,905.2 ly