Key parameters at a glance
- A radius of 1.74 Earth radii
- A mass of 3.68 Earth masses
- Surface gravity around 1.22 g
- An orbital period of 13.815 days
- Semi-major axis 0.1041 AU
- Equilibrium temperature 639 K (366 °C)
- Distance from Earth 746.37 light-years
- Earth Similarity Index 0.451
- Travel time at Voyager 1 speed 13,162,272 years
- Almost certainly tidally locked to its host star given the close orbit
K2-252 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#344of 1176
top 29.2%
This planet
1.74R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-252 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.74 | 11.21 |
| Mass (M⊕) | 1.00 | 3.68 | 317.83 |
| Density (g/cm³) | 5.51 | 3.84 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.22 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 152868838
Gaia DR2
Gaia DR2 3582392123779246336
Gaia DR3
Gaia DR3 3582392123779246336
System
K2-252
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 13.82 Earth days (3.8% of a terrestrial year) at a mean orbital distance of 0.1041 AU.
Transit Fingerprint
Depth
0.036 %
Duration
3.600 h
Impact parameter b
0.410
Rp / R★
0.019300
Transit midpoint (BJD)
2,457,596.1901
Photometric dip
Transit produces a flux drop of 360 ppm lasting ≈ 3.60 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019300
Semi-major axis / stellar radius
25.700
Impact parameter (b)
0.410
Transit mid-time (BJD)
2,457,596.1901
Angular separation (arcsec)
0.45500
Eq. Temperature
639K
(366 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.451
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
Livingston et al. 2018Instrument
Kepler CCD Array
Publication
2018-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-252
Spectral Class
K-type orange
Effective Temperature
5,152 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.820 R☉
Stellar Mass
0.790 M☉
Metallicity [Fe/H]
-0.09
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
2.040 g/cm³
Systemic radial velocity
13.72 km/s
Rotational v·sin i
2.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
4.341 mas
Total Proper Motion
22.917 mas/yr
PM Right Ascension
3.30 mas/yr
PM Declination
-22.68 mas/yr
Galactic Cartesian (pc)
x = -0.989 · y = -0.041 · z = -0.145
Equatorial (J2000)
RA 182.36638° · Dec -8.30961°
Galactic ℓ, b
285.453° · 53.132°
Ecliptic λ, β
185.483° · -6.681°
HTM-20 index
-488879535
Similar Worlds
Kepler-615 b
Super-Earth · K-type orange
Radius 1.74 R⊕ · 1,076.3 ly
Kepler-1856 b
Super-Earth · K-type orange
Radius 1.73 R⊕ · 2,768.3 ly
Kepler-245 e
Super-Earth · K-type orange
Radius 1.75 R⊕ · 2,809.9 ly
Kepler-1059 b
Super-Earth · K-type orange
Radius 1.73 R⊕ · 2,326.0 ly
Kepler-124 c
Super-Earth · K-type orange
Radius 1.75 R⊕ · 1,370.0 ly
K2-216 b
Super-Earth · K-type orange
Radius 1.75 R⊕ · 376.6 ly