Key parameters at a glance
- A radius of 1.95 Earth radii
- A mass of 10.70 Earth masses
- Surface gravity around 2.81 g
- An orbital period of 14.763 days
- Semi-major axis 0.1804 AU
- Equilibrium temperature 501 K (228 °C)
- Distance from Earth 505.41 light-years
- Earth Similarity Index 0.459
- Travel time at Voyager 1 speed 8,912,986 years
- Almost certainly tidally locked to its host star given the close orbit
3 siblings around K2-285
K2-285 e shares its host star with 3 other confirmed planets. Side-by-side measurements below.
K2-285 e Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#67of 1176
top 5.6%
This planet
1.95R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-285 e | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.95 | 11.21 |
| Mass (M⊕) | 1.00 | 10.70 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | 2.81 | 2.53 |
| Insolation (S⊕) | 1.00 | 10.50 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 10.700 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 262715204
Gaia DR2
Gaia DR2 2657374606238804992
Gaia DR3
Gaia DR3 2657374606238804992
System
K2-285
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 14.76 Earth days (4.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1804 AU.
Transit Fingerprint
Depth
0.068 %
Duration
2.300 h
Impact parameter b
0.170
Rp / R★
0.022704
Transit midpoint (BJD)
2,457,741.8969
Photometric dip
Transit produces a flux drop of 680 ppm lasting ≈ 2.30 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022704
Semi-major axis / stellar radius
49.430
Impact parameter (b)
0.170
RV semi-amplitude (K)
1.690 m/s
Transit mid-time (BJD)
2,457,741.8969
Angular separation (arcsec)
1.16000
Eq. Temperature
501K
(228 °C)
Insolation (S⊕)
10.50
Earth = 1.00
Earth Similarity (ESI)
0.459
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
Palle et al. 2019Instrument
Kepler CCD Array
Publication
2019-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-285
Spectral Class
K-type orange
Effective Temperature
4,975 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.787 R☉
Stellar Mass
0.830 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.400 dex
Stellar density
2.512 g/cm³
Systemic radial velocity
15.88 km/s
Rotational v·sin i
3.90 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
6.425 mas
Total Proper Motion
37.056 mas/yr
PM Right Ascension
15.02 mas/yr
PM Declination
-33.87 mas/yr
Galactic Cartesian (pc)
x = 0.983 · y = -0.184 · z = 0.023
Equatorial (J2000)
RA 349.38435° · Dec 1.30015°
Galactic ℓ, b
80.675° · -53.685°
Ecliptic λ, β
350.751° · 5.398°
HTM-20 index
204873357
Similar Worlds
WASP-84 c
Super-Earth · K-type orange
Radius 1.95 R⊕ · 328.1 ly
Kepler-62 d
Super-Earth · K-type orange
Radius 1.95 R⊕ · 981.3 ly
Kepler-330 c
Super-Earth · K-type orange
Radius 1.95 R⊕ · 2,340.3 ly
K2-368 d
Super-Earth · K-type orange
Radius 1.95 R⊕ · 673.9 ly
TOI-1739 b
Super-Earth · K-type orange
Radius 1.95 R⊕ · 231.5 ly
Kepler-1600 c
Super-Earth · K-type orange
Radius 1.94 R⊕ · 3,362.0 ly