Key parameters at a glance
- A radius of 3.26 Earth radii
- A mass of 66.00 Earth masses
- Surface gravity around 6.21 g
- An orbital period of 44.852 days
- Semi-major axis 0.2460 AU
- Equilibrium temperature 513 K (240 °C)
- Distance from Earth 2,726.21 light-years
- Earth Similarity Index 0.400
- Travel time at Voyager 1 speed 48,076,667 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-287
Kepler-287 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-287 b | Sub-Neptune | 2.33 | 83.00 | 20.342 | 667 | 2014 |
| Kepler-287 c this | Sub-Neptune | 3.26 | 66.00 | 44.852 | 513 | 2014 |
Kepler-287 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#305of 1978
top 15.4%
This planet
3.26R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-287 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.26 | 11.21 |
| Mass (M⊕) | 1.00 | 66.00 | 317.83 |
| Density (g/cm³) | 5.51 | 15.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 6.21 | 2.53 |
| Insolation (S⊕) | 1.00 | 12.46 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 66.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 417660580
Gaia DR2
Gaia DR2 2129509381668153984
Gaia DR3
Gaia DR3 2129509381668153984
System
Kepler-287
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 44.85 Earth days (12.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2460 AU.
Transit Fingerprint
Depth
0.078 %
Duration
3.584 h
Impact parameter b
0.830
Rp / R★
0.031699
Transit midpoint (BJD)
2,455,005.4630
Photometric dip
Transit produces a flux drop of 781 ppm lasting ≈ 3.58 h.
Extended Orbital Architecture
Planet / star radius ratio
0.031699
Semi-major axis / stellar radius
43.300
Impact parameter (b)
0.830
Transit mid-time (BJD)
2,455,005.4630
Angular separation (arcsec)
0.29400
Eq. Temperature
513K
(240 °C)
Insolation (S⊕)
12.46
Earth = 1.00
Earth Similarity (ESI)
0.400
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.
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-287
Spectral Class
K-type orange
Effective Temperature
5,806 K — hotter than the Sun (5,778 K)
Estimated Age
2.88 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.032 R☉
Stellar Mass
0.963 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.402 dex
Stellar density
1.290 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.168 mas
Total Proper Motion
18.307 mas/yr
PM Right Ascension
-6.72 mas/yr
PM Declination
-17.03 mas/yr
Galactic Cartesian (pc)
x = 0.237 · y = -0.620 · z = 0.748
Equatorial (J2000)
RA 290.92743° · Dec 48.44346°
Galactic ℓ, b
80.098° · 14.972°
Ecliptic λ, β
311.180° · 68.910°
HTM-20 index
-387954038
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TOI-5803 b
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