Key parameters at a glance
- A radius of 2.33 Earth radii
- A mass of 83.00 Earth masses
- Surface gravity around 15.29 g
- An orbital period of 20.342 days
- Semi-major axis 0.1450 AU
- Equilibrium temperature 667 K (394 °C)
- Distance from Earth 2,726.21 light-years
- Earth Similarity Index 0.276
- 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 b 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 this | Sub-Neptune | 2.33 | 83.00 | 20.342 | 667 | 2014 |
| Kepler-287 c | Sub-Neptune | 3.26 | 66.00 | 44.852 | 513 | 2014 |
Kepler-287 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1451of 1978
top 73.3%
This planet
2.33R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-287 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.33 | 11.21 |
| Mass (M⊕) | 1.00 | 83.00 | 317.83 |
| Density (g/cm³) | 5.51 | 27.30 | 1.33 |
| Surface Gravity (g) | 1.00 | 15.29 | 2.53 |
| Insolation (S⊕) | 1.00 | 35.75 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 83.000 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 20.34 Earth days (5.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1450 AU.
Transit Fingerprint
Depth
0.056 %
Duration
2.257 h
Impact parameter b
0.240
Rp / R★
0.021742
Transit midpoint (BJD)
2,454,970.6988
Photometric dip
Transit produces a flux drop of 565 ppm lasting ≈ 2.26 h.
Extended Orbital Architecture
Planet / star radius ratio
0.021742
Semi-major axis / stellar radius
38.000
Impact parameter (b)
0.240
Transit mid-time (BJD)
2,454,970.6988
Angular separation (arcsec)
0.17300
Eq. Temperature
667K
(394 °C)
Insolation (S⊕)
35.75
Earth = 1.00
Earth Similarity (ESI)
0.276
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-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
Similar Worlds
Kepler-241 b
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 1,669.9 ly
Kepler-1983 b
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 1,384.3 ly
Kepler-443 b
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 2,616.7 ly
Kepler-436 c
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 1,920.6 ly
Kepler-239 b
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 2,113.8 ly
Kepler-1802 c
Sub-Neptune · K-type orange
Radius 2.32 R⊕ · 2,076.6 ly