Key parameters at a glance
- A radius of 5.76 Earth radii
- A mass of 11.00 Earth masses
- Surface gravity around 0.33 g
- An orbital period of 19.492 days
- Semi-major axis 0.1493 AU
- Equilibrium temperature 817 K (544 °C)
- Distance from Earth 592.59 light-years
- Earth Similarity Index 0.183
- Travel time at Voyager 1 speed 10,450,374 years
EPIC 211945201 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#302of 574
top 52.4%
This planet
5.76R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | EPIC 211945201 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.76 | 11.21 |
| Mass (M⊕) | 1.00 | 11.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.33 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.33 | 2.53 |
| Insolation (S⊕) | 1.00 | 101.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 11.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 243244680
Gaia DR2
Gaia DR2 636363799347569408
Gaia DR3
Gaia DR3 636363799347569408
System
EPIC 211945201
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 19.49 Earth days (5.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1493 AU.
Transit Fingerprint
Depth
0.170 %
Duration
3.910 h
Impact parameter b
0.580
Rp / R★
0.037900
Transit midpoint (BJD)
2,457,158.8248
Photometric dip
Transit produces a flux drop of 1,700 ppm lasting ≈ 3.91 h.
Extended Orbital Architecture
Planet / star radius ratio
0.037900
Semi-major axis / stellar radius
35.630
Impact parameter (b)
0.580
RV semi-amplitude (K)
5.700 m/s
Transit mid-time (BJD)
2,457,158.8248
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.82200
Eq. Temperature
817K
(544 °C)
Insolation (S⊕)
101.00
Earth = 1.00
Earth Similarity (ESI)
0.183
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — 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
Chakraborty et al. 2018Instrument
Kepler CCD Array
Publication
2018-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: EPIC 211945201
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
6,069 K — hotter than the Sun (5,778 K)
Estimated Age
3.99 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.390 R☉
Stellar Mass
1.170 M☉
Metallicity [Fe/H]
0.10
Extended Stellar Properties
Surface gravity (log g)
4.220 dex
Stellar density
2.253 g/cm³
Systemic radial velocity
1.26 km/s
Rotational v·sin i
0.10 km/s
Activity index (log R'HK)
-5.193
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
5.475 mas
Total Proper Motion
61.773 mas/yr
PM Right Ascension
45.49 mas/yr
PM Declination
-41.79 mas/yr
Galactic Cartesian (pc)
x = -0.685 · y = 0.648 · z = 0.332
Equatorial (J2000)
RA 136.57419° · Dec 19.40206°
Galactic ℓ, b
208.782° · 38.128°
Ecliptic λ, β
133.293° · 2.687°
HTM-20 index
-1520383070
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