Key parameters at a glance
- A radius of 2.74 Earth radii
- A mass of 7.95 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 31.805 days
- Semi-major axis 0.2070 AU
- Equilibrium temperature 664 K (391 °C)
- Distance from Earth 2,241.32 light-years
- Earth Similarity Index 0.368
- Travel time at Voyager 1 speed 39,525,755 years
1 sibling around Kepler-212
Kepler-212 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-212 b | Rocky Terrestrial | 1.09 | 1.32 | 16.258 | 830 | 2014 |
| Kepler-212 c this | Sub-Neptune | 2.74 | 7.95 | 31.805 | 664 | 2014 |
Kepler-212 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#815of 1978
top 41.2%
This planet
2.74R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-212 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.74 | 11.21 |
| Mass (M⊕) | 1.00 | 7.95 | 317.83 |
| Density (g/cm³) | 5.51 | 2.12 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 54.66 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158551888
Gaia DR2
Gaia DR2 2102610280669509888
Gaia DR3
Gaia DR3 2102610280669509888
System
Kepler-212
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 31.81 Earth days (8.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2070 AU.
Transit Fingerprint
Depth
0.036 %
Duration
8.316 h
Impact parameter b
0.150
Rp / R★
0.016520
Transit midpoint (BJD)
2,455,023.2483
Photometric dip
Transit produces a flux drop of 361 ppm lasting ≈ 8.32 h.
Extended Orbital Architecture
Planet / star radius ratio
0.016520
Semi-major axis / stellar radius
29.670
Impact parameter (b)
0.150
Transit mid-time (BJD)
2,455,023.2483
Angular separation (arcsec)
0.30100
Eq. Temperature
664K
(391 °C)
Insolation (S⊕)
54.66
Earth = 1.00
Earth Similarity (ESI)
0.368
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-212
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,852 K — hotter than the Sun (5,778 K)
Estimated Age
5.13 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.455 R☉
Stellar Mass
1.166 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.182 dex
Stellar density
0.390 g/cm³
Systemic radial velocity
-7.08 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
1.426 mas
Total Proper Motion
8.763 mas/yr
PM Right Ascension
-2.27 mas/yr
PM Declination
-8.46 mas/yr
Galactic Cartesian (pc)
x = 0.221 · y = -0.695 · z = 0.684
Equatorial (J2000)
RA 287.62082° · Dec 43.14162°
Galactic ℓ, b
74.115° · 14.946°
Ecliptic λ, β
301.104° · 64.689°
HTM-20 index
-2107769569
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Kepler-221 d
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