Key parameters at a glance
- A radius of 2.26 Earth radii
- A mass of 5.73 Earth masses
- Surface gravity around 1.12 g
- An orbital period of 21.347 days
- Semi-major axis 0.1520 AU
- Equilibrium temperature 648 K (375 °C)
- Distance from Earth 2,249.87 light-years
- Earth Similarity Index 0.406
- Travel time at Voyager 1 speed 39,676,451 years
1 sibling around Kepler-163
Kepler-163 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-163 b | Rocky Terrestrial | 1.05 | 1.16 | 7.811 | 906 | 2014 |
| Kepler-163 c this | Sub-Neptune | 2.26 | 5.73 | 21.347 | 648 | 2014 |
Kepler-163 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1572of 1978
top 79.4%
This planet
2.26R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-163 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.26 | 11.21 |
| Mass (M⊕) | 1.00 | 5.73 | 317.83 |
| Density (g/cm³) | 5.51 | 2.73 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 30.24 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 271355638
Gaia DR2
Gaia DR2 2128525769736134016
Gaia DR3
Gaia DR3 2128525769736134016
System
Kepler-163
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 21.35 Earth days (5.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1520 AU.
Transit Fingerprint
Depth
0.063 %
Duration
3.765 h
Impact parameter b
0.150
Rp / R★
0.022714
Transit midpoint (BJD)
2,455,004.7359
Photometric dip
Transit produces a flux drop of 631 ppm lasting ≈ 3.77 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022714
Semi-major axis / stellar radius
43.540
Impact parameter (b)
0.150
Transit mid-time (BJD)
2,455,004.7359
Angular separation (arcsec)
0.22000
Eq. Temperature
648K
(375 °C)
Insolation (S⊕)
30.24
Earth = 1.00
Earth Similarity (ESI)
0.406
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-163
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,776 K — cooler than the Sun (5,778 K)
Estimated Age
4.27 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.917 R☉
Stellar Mass
0.882 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
4.524 dex
Stellar density
2.113 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.421 mas
Total Proper Motion
10.688 mas/yr
PM Right Ascension
-9.72 mas/yr
PM Declination
-4.44 mas/yr
Galactic Cartesian (pc)
x = 0.288 · y = -0.618 · z = 0.731
Equatorial (J2000)
RA 295.00275° · Dec 46.98734°
Galactic ℓ, b
79.973° · 11.871°
Ecliptic λ, β
316.210° · 66.460°
HTM-20 index
-1136644196
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HD 28471 c
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Kepler-1863 b
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Radius 2.26 R⊕ · 2,823.0 ly