Key parameters at a glance
- A radius of 6.54 Earth radii
- A mass of 42.10 Earth masses
- Surface gravity around 0.98 g
- An orbital period of 74.920 days
- Semi-major axis 0.3360 AU
- Equilibrium temperature 409 K (136 °C)
- Distance from Earth 2,257.46 light-years
- Earth Similarity Index 0.401
- Travel time at Voyager 1 speed 39,810,237 years
2 siblings around Kepler-297
Kepler-297 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-297 b | Sub-Neptune | 2.87 | 48.50 | 38.872 | 509 | 2014 |
| Kepler-297 c this | Neptune-like | 6.54 | 42.10 | 74.920 | 409 | 2014 |
| Kepler-297 d | Gas Giant | 32.60 | — | 150.019 | 325 | 2023 |
Kepler-297 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#236of 574
top 40.9%
This planet
6.54R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-297 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.54 | 11.21 |
| Mass (M⊕) | 1.00 | 42.10 | 317.83 |
| Density (g/cm³) | 5.51 | 0.83 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.98 | 2.53 |
| Insolation (S⊕) | 1.00 | 6.86 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 42.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 48304302
Gaia DR2
Gaia DR2 2131748747552136960
Gaia DR3
Gaia DR3 2131748747552136960
System
Kepler-297
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 74.92 Earth days (20.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3360 AU.
Transit Fingerprint
Depth
0.412 %
Duration
4.794 h
Impact parameter b
0.810
Rp / R★
0.067780
Transit midpoint (BJD)
2,454,958.0377
Photometric dip
Transit produces a flux drop of 4,119 ppm lasting ≈ 4.79 h.
Extended Orbital Architecture
Planet / star radius ratio
0.067780
Semi-major axis / stellar radius
78.200
Impact parameter (b)
0.810
Transit mid-time (BJD)
2,454,958.0377
Angular separation (arcsec)
0.48500
Eq. Temperature
409K
(136 °C)
Insolation (S⊕)
6.86
Earth = 1.00
Earth Similarity (ESI)
0.401
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
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-297
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,619 K — cooler than the Sun (5,778 K)
Estimated Age
1.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.915 R☉
Stellar Mass
0.927 M☉
Metallicity [Fe/H]
-0.11
Extended Stellar Properties
Surface gravity (log g)
4.468 dex
Stellar density
1.390 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.416 mas
Total Proper Motion
2.487 mas/yr
PM Right Ascension
2.16 mas/yr
PM Declination
-1.23 mas/yr
Galactic Cartesian (pc)
x = 0.151 · y = -0.642 · z = 0.752
Equatorial (J2000)
RA 283.20916° · Dec 48.77762°
Galactic ℓ, b
78.461° · 19.840°
Ecliptic λ, β
297.484° · 70.959°
HTM-20 index
1906438192
Similar Worlds
Kepler-673 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.54 R⊕ · 2,994.8 ly
Kepler-603 c
Neptune-like · G-type yellow (Sun-like)
Radius 6.50 R⊕ · 5,021.6 ly
K2-19 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.59 R⊕ · 945.3 ly
TOI-5108 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.60 R⊕ · 427.0 ly
TOI-4940 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.61 R⊕ · 1,127.4 ly
HD 206255 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.47 R⊕ · 245.4 ly