Key parameters at a glance
- A radius of 1.59 Earth radii
- A mass of 3.15 Earth masses
- Surface gravity around 1.25 g
- An orbital period of 2.211 days
- Semi-major axis 0.0290 AU
- Equilibrium temperature 931 K (658 °C)
- Distance from Earth 1,887.78 light-years
- Earth Similarity Index 0.317
- Travel time at Voyager 1 speed 33,290,961 years
- Almost certainly tidally locked to its host star given the close orbit
4 siblings around Kepler-55
Kepler-55 d shares its host star with 4 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-55 d this | Super-Earth | 1.59 | 3.15 | 2.211 | 931 | 2014 |
| Kepler-55 e | Super-Earth | 1.55 | 3.02 | 4.618 | 728 | 2014 |
| Kepler-55 f | Super-Earth | 1.59 | 3.15 | 10.199 | 559 | 2014 |
| Kepler-55 b | Sub-Neptune | 2.43 | 43.00 | 27.948 | 400 | 2012 |
| Kepler-55 c | Sub-Neptune | 2.21 | 69.80 | 42.152 | 349 | 2012 |
Kepler-55 d Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#588of 1176
top 49.9%
This planet
1.59R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-55 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.59 | 11.21 |
| Mass (M⊕) | 1.00 | 3.15 | 317.83 |
| Density (g/cm³) | 5.51 | 4.31 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.25 | 2.53 |
| Insolation (S⊕) | 1.00 | 195.01 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 164884002
Gaia DR2
Gaia DR2 2105930840143687680
Gaia DR3
Gaia DR3 2105930840143687680
System
Kepler-55
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.21 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0290 AU.
Transit Fingerprint
Depth
0.066 %
Duration
1.644 h
Impact parameter b
0.020
Rp / R★
0.022859
Transit midpoint (BJD)
2,455,003.1491
Photometric dip
Transit produces a flux drop of 662 ppm lasting ≈ 1.64 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022859
Semi-major axis / stellar radius
9.819
Impact parameter (b)
0.020
Transit mid-time (BJD)
2,455,003.1491
Angular separation (arcsec)
0.05010
Eq. Temperature
931K
(658 °C)
Insolation (S⊕)
195.01
Earth = 1.00
Earth Similarity (ESI)
0.317
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.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
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-55
Spectral Class
K-type orange
Effective Temperature
4,503 K — cooler than the Sun (5,778 K)
Estimated Age
2.34 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.619 R☉
Stellar Mass
0.631 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.684 dex
Stellar density
0.025 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.699 mas
Total Proper Motion
1.815 mas/yr
PM Right Ascension
-1.78 mas/yr
PM Declination
-0.36 mas/yr
Galactic Cartesian (pc)
x = 0.188 · y = -0.694 · z = 0.695
Equatorial (J2000)
RA 285.16833° · Dec 44.02649°
Galactic ℓ, b
74.258° · 16.925°
Ecliptic λ, β
297.571° · 66.020°
HTM-20 index
84294904
Similar Worlds
K2-50 b
Super-Earth · K-type orange
Radius 1.59 R⊕ · 839.7 ly
Kepler-928 b
Super-Earth · K-type orange
Radius 1.59 R⊕ · 1,659.5 ly
Kepler-55 f
Super-Earth · K-type orange
Radius 1.59 R⊕ · 1,887.8 ly
K2-344 b
Super-Earth · K-type orange
Radius 1.59 R⊕ · 245.2 ly
Kepler-1804 b
Super-Earth · K-type orange
Radius 1.60 R⊕ · 1,417.0 ly
EPIC 212499991 b
Super-Earth · K-type orange
Radius 1.60 R⊕ · 924.0 ly