Key parameters at a glance
- A radius of 4.51 Earth radii
- A mass of 18.50 Earth masses
- Surface gravity around 0.91 g
- An orbital period of 3.471 days
- Semi-major axis 0.0378 AU
- Equilibrium temperature 939 K (666 °C)
- Distance from Earth 595.35 light-years
- Earth Similarity Index 0.209
- Travel time at Voyager 1 speed 10,499,034 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around K2-43
K2-43 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 |
|---|---|---|---|---|---|---|
| K2-43 c | Sub-Neptune | 2.42 | 6.44 | 2.199 | 1,094 | 2019 |
| K2-43 b this | Neptune-like | 4.51 | 18.50 | 3.471 | 939 | 2016 |
K2-43 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#460of 574
top 80.0%
This planet
4.51R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | K2-43 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.51 | 11.21 |
| Mass (M⊕) | 1.00 | 18.50 | 317.83 |
| Density (g/cm³) | 5.51 | 1.11 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.91 | 2.53 |
| Insolation (S⊕) | 1.00 | 49.00 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 443616612
Gaia DR2
Gaia DR2 3789847707126025600
Gaia DR3
Gaia DR3 3789847707126025600
System
K2-43
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.47 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0378 AU.
Transit Fingerprint
Depth
0.665 %
Duration
2.045 h
Impact parameter b
0.110
Rp / R★
0.042980
Transit midpoint (BJD)
2,456,809.8843
Photometric dip
Transit produces a flux drop of 6,650 ppm lasting ≈ 2.04 h.
Extended Orbital Architecture
Planet / star radius ratio
0.042980
Semi-major axis / stellar radius
8.000
Impact parameter (b)
0.110
Transit mid-time (BJD)
2,456,809.8843
Long. of periastron (ω)
-25.11°
Angular separation (arcsec)
0.20700
Eq. Temperature
939K
(666 °C)
Insolation (S⊕)
49.00
Earth = 1.00
Earth Similarity (ESI)
0.209
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
Crossfield et al. 2016Instrument
Kepler CCD Array
Publication
2016-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-43
Spectral Class
K-type orange
Effective Temperature
3,841 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.542 R☉
Stellar Mass
0.571 M☉
Metallicity [Fe/H]
—
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
5.450 mas
Total Proper Motion
29.149 mas/yr
PM Right Ascension
-29.09 mas/yr
PM Declination
-1.89 mas/yr
Galactic Cartesian (pc)
x = -0.980 · y = 0.188 · z = -0.069
Equatorial (J2000)
RA 169.11703° · Dec -3.97544°
Galactic ℓ, b
262.897° · 51.361°
Ecliptic λ, β
171.564° · -7.963°
HTM-20 index
1823323898
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