Key parameters at a glance
- A radius of 9.49 Earth radii
- A mass of 100.12 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 14.893 days
- Semi-major axis 0.1206 AU
- Equilibrium temperature 804 K (531 °C)
- Distance from Earth 516.42 light-years
- Earth Similarity Index 0.186
- Travel time at Voyager 1 speed 9,107,050 years
K2-287 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#46of 574
top 7.8%
This planet
9.49R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | K2-287 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.49 | 11.21 |
| Mass (M⊕) | 1.00 | 100.12 | 317.83 |
| Density (g/cm³) | 5.51 | 0.63 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 100.116 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 73848324
Gaia DR2
Gaia DR2 6239702034929248512
Gaia DR3
Gaia DR3 6239702034929248512
System
K2-287
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 14.89 Earth days (4.1% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1206 AU.
Transit Fingerprint
Depth
0.640 %
Duration
3.500 h
Impact parameter b
0.800
Rp / R★
0.080140
Transit midpoint (BJD)
2,458,001.7214
Photometric dip
Transit produces a flux drop of 6,400 ppm lasting ≈ 3.50 h.
Extended Orbital Architecture
Planet / star radius ratio
0.080140
Semi-major axis / stellar radius
23.870
Impact parameter (b)
0.800
RV semi-amplitude (K)
28.800 m/s
Transit mid-time (BJD)
2,458,001.7214
Long. of periastron (ω)
10.10°
Sky-projected obliquity (λ)
23.00°
Angular separation (arcsec)
0.76200
Eq. Temperature
804K
(531 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.186
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Jord Aacute N et al. 2019Instrument
Kepler CCD Array
Publication
2019-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-287
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,695 K — cooler than the Sun (5,778 K)
Estimated Age
4.50 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.070 R☉
Stellar Mass
1.056 M☉
Metallicity [Fe/H]
0.20
Extended Stellar Properties
Surface gravity (log g)
4.398 dex
Stellar density
1.217 g/cm³
Systemic radial velocity
32.93 km/s
Rotational v·sin i
3.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
6.288 mas
Total Proper Motion
18.479 mas/yr
PM Right Ascension
-4.59 mas/yr
PM Declination
-17.90 mas/yr
Galactic Cartesian (pc)
x = -0.556 · y = -0.739 · z = -0.380
Equatorial (J2000)
RA 233.07434° · Dec -22.35834°
Galactic ℓ, b
345.043° · 27.070°
Ecliptic λ, β
236.185° · -3.149°
HTM-20 index
1875203132
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