Key parameters at a glance
- A radius of 1.33 Earth radii
- A mass of 2.33 Earth masses
- Surface gravity around 1.31 g
- An orbital period of 0.670 days
- Semi-major axis 0.0142 AU
- Equilibrium temperature 1,873 K (1600 °C)
- Distance from Earth 888.11 light-years
- Earth Similarity Index 0.150
- Travel time at Voyager 1 speed 15,661,872 years
- Almost certainly tidally locked to its host star given the close orbit
K2-211 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#1020of 1176
top 86.6%
This planet
1.33R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-211 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.33 | 11.21 |
| Mass (M⊕) | 1.00 | 2.33 | 317.83 |
| Density (g/cm³) | 5.51 | 5.42 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.31 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 399731211
Gaia DR2
Gaia DR2 2559203924574351616
Gaia DR3
Gaia DR3 2559203924574351616
System
K2-211
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 16.1 hours long on a mildly elliptical path at a mean orbital distance of 0.0142 AU.
Transit Fingerprint
Depth
0.022 %
Duration
1.291 h
Impact parameter b
0.360
Rp / R★
0.014890
Transit midpoint (BJD)
2,457,432.6479
Photometric dip
Transit produces a flux drop of 222 ppm lasting ≈ 1.29 h.
Extended Orbital Architecture
Planet / star radius ratio
0.014890
Semi-major axis / stellar radius
3.730
Impact parameter (b)
0.360
Transit mid-time (BJD)
2,457,432.6479
Long. of periastron (ω)
-150.00°
Angular separation (arcsec)
0.05210
Eq. Temperature
1,873K
(1600 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.150
0 = alien, 1 = Earth-identical
Insufficient insolation data — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Mayo et al. 2018Instrument
Kepler CCD Array
Publication
2018-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-211
Spectral Class
K-type orange
Effective Temperature
5,117 K — cooler than the Sun (5,778 K)
Estimated Age
6.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.818 R☉
Stellar Mass
0.851 M☉
Metallicity [Fe/H]
0.13
Extended Stellar Properties
Surface gravity (log g)
4.543 dex
Stellar density
2.190 g/cm³
Systemic radial velocity
-13.57 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.644 mas
Total Proper Motion
49.700 mas/yr
PM Right Ascension
48.66 mas/yr
PM Declination
-10.14 mas/yr
Galactic Cartesian (pc)
x = 0.933 · y = 0.360 · z = 0.030
Equatorial (J2000)
RA 21.10616° · Dec 1.70491°
Galactic ℓ, b
139.643° · -60.092°
Ecliptic λ, β
20.141° · -6.654°
HTM-20 index
620015873
Similar Worlds
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K2-148 b
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