Key parameters at a glance
- A radius of 1.32 Earth radii
- A mass of 2.30 Earth masses
- Surface gravity around 1.32 g
- An orbital period of 3.887 days
- Semi-major axis 0.0534 AU
- Equilibrium temperature 1,574 K (1301 °C)
- Distance from Earth 3,602.85 light-years
- Earth Similarity Index 0.186
- Travel time at Voyager 1 speed 63,536,250 years
2 siblings around Kepler-217
Kepler-217 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-217 d this | Super-Earth | 1.32 | 2.30 | 3.887 | 1,574 | 2016 |
| Kepler-217 b | Sub-Neptune | 2.23 | 5.60 | 5.375 | 1,413 | 2014 |
| Kepler-217 c | Super-Earth | 1.85 | 4.08 | 8.586 | 1,208 | 2014 |
Kepler-217 d Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#1049of 1176
top 89.1%
This planet
1.32R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-217 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.32 | 11.21 |
| Mass (M⊕) | 1.00 | 2.30 | 317.83 |
| Density (g/cm³) | 5.51 | 5.50 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.32 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,099.75 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 240178935
Gaia DR2
Gaia DR2 2128268380936413568
Gaia DR3
Gaia DR3 2128268380936413568
System
Kepler-217
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.89 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0534 AU.
Transit Fingerprint
Depth
0.006 %
Duration
3.658 h
Impact parameter b
0.825
Rp / R★
0.007242
Transit midpoint (BJD)
2,454,965.4939
Photometric dip
Transit produces a flux drop of 58 ppm lasting ≈ 3.66 h.
Extended Orbital Architecture
Planet / star radius ratio
0.007242
Semi-major axis / stellar radius
4.400
Impact parameter (b)
0.825
Transit mid-time (BJD)
2,454,965.4939
Angular separation (arcsec)
0.04830
Eq. Temperature
1,574K
(1301 °C)
Insolation (S⊕)
2,099.75
Earth = 1.00
Earth Similarity (ESI)
0.186
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Discovery Paper
Primary reference
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-217
Spectral Class
F-type yellow-white
Effective Temperature
6,341 K — hotter than the Sun (5,778 K)
Estimated Age
2.63 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.760 R☉
Stellar Mass
1.370 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.080 dex
Stellar density
0.250 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
0.876 mas
Total Proper Motion
1.992 mas/yr
PM Right Ascension
-1.80 mas/yr
PM Declination
0.84 mas/yr
Galactic Cartesian (pc)
x = 0.270 · y = -0.636 · z = 0.723
Equatorial (J2000)
RA 293.03773° · Dec 46.27752°
Galactic ℓ, b
78.704° · 12.758°
Ecliptic λ, β
312.408° · 66.357°
HTM-20 index
-1442853971
Similar Worlds
Kepler-90 i
Super-Earth · F-type yellow-white
Radius 1.32 R⊕ · 2,766.6 ly
KOI-351 b
Super-Earth · F-type yellow-white
Radius 1.31 R⊕ · 2,766.6 ly
Kepler-144 b
Super-Earth · F-type yellow-white
Radius 1.33 R⊕ · 1,255.4 ly
Kepler-1298 b
Super-Earth · F-type yellow-white
Radius 1.31 R⊕ · 1,774.8 ly
Kepler-393 c
Super-Earth · F-type yellow-white
Radius 1.33 R⊕ · 2,874.8 ly
Kepler-1508 b
Super-Earth · F-type yellow-white
Radius 1.33 R⊕ · 4,110.5 ly