Key parameters at a glance
- A radius of 1.14 Earth radii
- A mass of 1.55 Earth masses
- Surface gravity around 1.19 g
- An orbital period of 7.061 days
- Semi-major axis 0.0570 AU
- Equilibrium temperature 521 K (248 °C)
- Distance from Earth 684.07 light-years
- Earth Similarity Index 0.605
- Travel time at Voyager 1 speed 12,063,628 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-303
Kepler-303 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-303 b | Rocky Terrestrial | 0.89 | 0.64 | 1.937 | 802 | 2014 |
| Kepler-303 c this | Rocky Terrestrial | 1.14 | 1.55 | 7.061 | 521 | 2014 |
Kepler-303 c Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#169of 570
top 29.5%
This planet
1.14R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-303 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.14 | 11.21 |
| Mass (M⊕) | 1.00 | 1.55 | 317.83 |
| Density (g/cm³) | 5.51 | 5.75 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.19 | 2.53 |
| Insolation (S⊕) | 1.00 | 25.85 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 164460208
Gaia DR2
Gaia DR2 2105113765565227648
Gaia DR3
Gaia DR3 2105113765565227648
System
Kepler-303
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.06 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0570 AU.
Transit Fingerprint
Depth
0.050 %
Duration
1.054 h
Impact parameter b
0.680
Rp / R★
0.020579
Transit midpoint (BJD)
2,454,969.2719
Photometric dip
Transit produces a flux drop of 498 ppm lasting ≈ 1.05 h.
Extended Orbital Architecture
Planet / star radius ratio
0.020579
Semi-major axis / stellar radius
54.222
Impact parameter (b)
0.680
Transit mid-time (BJD)
2,454,969.2719
Angular separation (arcsec)
0.27200
Eq. Temperature
521K
(248 °C)
Insolation (S⊕)
25.85
Earth = 1.00
Earth Similarity (ESI)
0.605
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-303
Spectral Class
M-type red dwarf
Effective Temperature
3,944 K — cooler than the Sun (5,778 K)
Estimated Age
7.71 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.485 R☉
Stellar Mass
0.575 M☉
Metallicity [Fe/H]
-0.41
Extended Stellar Properties
Surface gravity (log g)
4.768 dex
Stellar density
5.283 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
4.739 mas
Total Proper Motion
76.827 mas/yr
PM Right Ascension
2.44 mas/yr
PM Declination
-76.79 mas/yr
Galactic Cartesian (pc)
x = 0.164 · y = -0.705 · z = 0.690
Equatorial (J2000)
RA 283.13547° · Dec 43.65670°
Galactic ℓ, b
73.343° · 18.161°
Ecliptic λ, β
293.851° · 66.012°
HTM-20 index
735759892
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