Key parameters at a glance
- A radius of 0.98 Earth radii
- A mass of 0.90 Earth masses
- Surface gravity around 0.94 g
- An orbital period of 28.122 days
- Semi-major axis 0.1630 AU
- Equilibrium temperature 401 K (128 °C)
- Distance from Earth 558.08 light-years
- Earth Similarity Index 0.771
- Travel time at Voyager 1 speed 9,841,780 years
- Almost certainly tidally locked to its host star given the close orbit
3 siblings around Kepler-220
Kepler-220 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-220 b | Rocky Terrestrial | 0.81 | 0.46 | 4.160 | 759 | 2014 |
| Kepler-220 c | Super-Earth | 1.57 | 3.09 | 9.034 | 586 | 2014 |
| Kepler-220 d this | Rocky Terrestrial | 0.98 | 0.90 | 28.122 | 401 | 2014 |
| Kepler-220 e | Super-Earth | 1.33 | 2.33 | 45.903 | 341 | 2014 |
Kepler-220 d Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#355of 570
top 62.1%
This planet
0.98R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-220 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 0.98 | 11.21 |
| Mass (M⊕) | 1.00 | 0.90 | 317.83 |
| Density (g/cm³) | 5.51 | 5.28 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.94 | 2.53 |
| Insolation (S⊕) | 1.00 | 8.21 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159759306
Gaia DR2
Gaia DR2 2129084935820532608
Gaia DR3
Gaia DR3 2129084935820532608
System
Kepler-220
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 28.12 Earth days (7.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1630 AU.
Transit Fingerprint
Depth
0.021 %
Duration
4.103 h
Impact parameter b
0.140
Rp / R★
0.012300
Transit midpoint (BJD)
2,454,979.9188
Photometric dip
Transit produces a flux drop of 208 ppm lasting ≈ 4.10 h.
Extended Orbital Architecture
Planet / star radius ratio
0.012300
Semi-major axis / stellar radius
39.700
Impact parameter (b)
0.140
Transit mid-time (BJD)
2,454,979.9188
Angular separation (arcsec)
0.95300
Eq. Temperature
401K
(128 °C)
Insolation (S⊕)
8.21
Earth = 1.00
Earth Similarity (ESI)
0.771
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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-220
Spectral Class
K-type orange
Effective Temperature
4,632 K — cooler than the Sun (5,778 K)
Estimated Age
6.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.666 R☉
Stellar Mass
0.729 M☉
Metallicity [Fe/H]
-0.17
Extended Stellar Properties
Surface gravity (log g)
4.652 dex
Stellar density
2.220 g/cm³
Systemic radial velocity
15.90 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
5.815 mas
Total Proper Motion
42.594 mas/yr
PM Right Ascension
-25.71 mas/yr
PM Declination
-33.96 mas/yr
Galactic Cartesian (pc)
x = 0.251 · y = -0.636 · z = 0.730
Equatorial (J2000)
RA 291.50604° · Dec 46.89563°
Galactic ℓ, b
78.812° · 13.974°
Ecliptic λ, β
310.538° · 67.332°
HTM-20 index
-169065112
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HD 101581 c
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TOI-2322 b
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EPIC 206317286 b
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EPIC 201833600 c
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HD 101581 b
Rocky Terrestrial · K-type orange
Radius 0.96 R⊕ · 41.7 ly