Key parameters at a glance
- A radius of 1.84 Earth radii
- A mass of 4.04 Earth masses
- Surface gravity around 1.19 g
- An orbital period of 17.281 days
- Semi-major axis 0.1050 AU
- Equilibrium temperature 425 K (152 °C)
- Distance from Earth 1,892.09 light-years
- Earth Similarity Index 0.638
- Travel time at Voyager 1 speed 33,367,057 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around Kepler-331
Kepler-331 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-331 b | Super-Earth | 1.82 | 3.97 | 8.457 | 540 | 2014 |
| Kepler-331 c this | Super-Earth | 1.84 | 4.04 | 17.281 | 425 | 2014 |
| Kepler-331 d | Super-Earth | 1.64 | 3.33 | 32.134 | 346 | 2014 |
Kepler-331 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#201of 1176
top 17.0%
This planet
1.84R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-331 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.84 | 11.21 |
| Mass (M⊕) | 1.00 | 4.04 | 317.83 |
| Density (g/cm³) | 5.51 | 3.56 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.19 | 2.53 |
| Insolation (S⊕) | 1.00 | 13.89 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 351063265
Gaia DR2
Gaia DR2 2052794982231985664
Gaia DR3
Gaia DR3 2052794982231985664
System
Kepler-331
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.28 Earth days (4.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1050 AU.
Transit Fingerprint
Depth
0.160 %
Duration
2.772 h
Impact parameter b
0.080
Rp / R★
0.036590
Transit midpoint (BJD)
2,454,969.0080
Photometric dip
Transit produces a flux drop of 1,599 ppm lasting ≈ 2.77 h.
Extended Orbital Architecture
Planet / star radius ratio
0.036590
Semi-major axis / stellar radius
46.200
Impact parameter (b)
0.080
Transit mid-time (BJD)
2,454,969.0080
Angular separation (arcsec)
0.18100
Eq. Temperature
425K
(152 °C)
Insolation (S⊕)
13.89
Earth = 1.00
Earth Similarity (ESI)
0.638
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-331
Spectral Class
K-type orange
Effective Temperature
4,347 K — cooler than the Sun (5,778 K)
Estimated Age
1.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.492 R☉
Stellar Mass
0.653 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.768 dex
Stellar density
6.724 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.696 mas
Total Proper Motion
2.823 mas/yr
PM Right Ascension
1.38 mas/yr
PM Declination
-2.46 mas/yr
Galactic Cartesian (pc)
x = 0.288 · y = -0.718 · z = 0.633
Equatorial (J2000)
RA 291.83435° · Dec 39.30735°
Galactic ℓ, b
71.928° · 10.453°
Ecliptic λ, β
305.259° · 60.102°
HTM-20 index
1531729450
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