Key parameters at a glance
- A radius of 2.49 Earth radii
- A mass of 6.76 Earth masses
- Surface gravity around 1.09 g
- An orbital period of 3.106 days
- Semi-major axis 0.0399 AU
- Equilibrium temperature 980 K (707 °C)
- Distance from Earth 913.46 light-years
- Earth Similarity Index 0.256
- Travel time at Voyager 1 speed 16,108,899 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-475 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1191of 1978
top 60.2%
This planet
2.49R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-475 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.49 | 11.21 |
| Mass (M⊕) | 1.00 | 6.76 | 317.83 |
| Density (g/cm³) | 5.51 | 2.41 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.09 | 2.53 |
| Insolation (S⊕) | 1.00 | 215.46 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 121108727
Gaia DR2
Gaia DR2 2100597143598879616
Gaia DR3
Gaia DR3 2100597143598879616
System
Kepler-475
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.11 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0399 AU.
Transit Fingerprint
Depth
0.091 %
Duration
1.721 h
Impact parameter b
0.800
Rp / R★
0.028977
Transit midpoint (BJD)
2,454,966.2104
Photometric dip
Transit produces a flux drop of 911 ppm lasting ≈ 1.72 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028977
Semi-major axis / stellar radius
8.800
Impact parameter (b)
0.800
Transit mid-time (BJD)
2,454,966.2104
Angular separation (arcsec)
0.14200
Eq. Temperature
980K
(707 °C)
Insolation (S⊕)
215.46
Earth = 1.00
Earth Similarity (ESI)
0.256
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
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-475
Spectral Class
K-type orange
Effective Temperature
5,009 K — cooler than the Sun (5,778 K)
Estimated Age
2.69 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.790 R☉
Stellar Mass
0.860 M☉
Metallicity [Fe/H]
0.21
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
1.800 g/cm³
Systemic radial velocity
-13.21 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.542 mas
Total Proper Motion
24.793 mas/yr
PM Right Ascension
-4.41 mas/yr
PM Declination
-24.40 mas/yr
Galactic Cartesian (pc)
x = 0.224 · y = -0.730 · z = 0.646
Equatorial (J2000)
RA 287.05169° · Dec 40.21142°
Galactic ℓ, b
71.165° · 14.164°
Ecliptic λ, β
298.461° · 61.976°
HTM-20 index
-1630610264
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