Key parameters at a glance
- A radius of 3.43 Earth radii
- A mass of 11.60 Earth masses
- Surface gravity around 0.99 g
- An orbital period of 49.500 days
- Semi-major axis 0.2460 AU
- Equilibrium temperature 402 K (129 °C)
- Distance from Earth 2,245.82 light-years
- Earth Similarity Index 0.526
- Travel time at Voyager 1 speed 39,605,071 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around Kepler-357
Kepler-357 d 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-357 b | Super-Earth | 1.84 | 4.04 | 6.475 | 793 | 2014 |
| Kepler-357 c | Sub-Neptune | 2.67 | 7.61 | 16.858 | 576 | 2014 |
| Kepler-357 d this | Sub-Neptune | 3.43 | 11.60 | 49.500 | 402 | 2014 |
Kepler-357 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#205of 1978
top 10.3%
This planet
3.43R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-357 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.43 | 11.21 |
| Mass (M⊕) | 1.00 | 11.60 | 317.83 |
| Density (g/cm³) | 5.51 | 1.58 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.99 | 2.53 |
| Insolation (S⊕) | 1.00 | 4.62 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159649595
Gaia DR2
Gaia DR2 2126194667646233984
Gaia DR3
Gaia DR3 2126194667646233984
System
Kepler-357
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 49.50 Earth days (13.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2460 AU.
Transit Fingerprint
Depth
0.097 %
Duration
6.594 h
Impact parameter b
0.910
Rp / R★
0.027578
Transit midpoint (BJD)
2,454,972.0495
Photometric dip
Transit produces a flux drop of 965 ppm lasting ≈ 6.59 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027578
Semi-major axis / stellar radius
66.490
Impact parameter (b)
0.910
Transit mid-time (BJD)
2,454,972.0495
Angular separation (arcsec)
0.35700
Eq. Temperature
402K
(129 °C)
Insolation (S⊕)
4.62
Earth = 1.00
Earth Similarity (ESI)
0.526
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-357
Spectral Class
K-type orange
Effective Temperature
5,036 K — cooler than the Sun (5,778 K)
Estimated Age
2.14 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.834 R☉
Stellar Mass
0.794 M☉
Metallicity [Fe/H]
0.06
Extended Stellar Properties
Surface gravity (log g)
4.503 dex
Stellar density
1.990 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.424 mas
Total Proper Motion
23.039 mas/yr
PM Right Ascension
-15.32 mas/yr
PM Declination
-17.21 mas/yr
Galactic Cartesian (pc)
x = 0.261 · y = -0.670 · z = 0.695
Equatorial (J2000)
RA 291.24297° · Dec 44.00863°
Galactic ℓ, b
76.045° · 12.913°
Ecliptic λ, β
307.572° · 64.701°
HTM-20 index
800219681
Similar Worlds
TOI-5789 e
Sub-Neptune · K-type orange
Radius 3.43 R⊕ · 66.7 ly
TOI-1246 d
Sub-Neptune · K-type orange
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Kepler-712 b
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HD 69830 c
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TOI-1853 b
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K2-105 b
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Radius 3.40 R⊕ · 645.8 ly