Key parameters at a glance
- A radius of 7.00 Earth radii
- A mass of 8.00 Earth masses
- Surface gravity around 0.16 g
- An orbital period of 7.749 days
- Semi-major axis 0.0683 AU
- Equilibrium temperature 695 K (422 °C)
- Distance from Earth 201.80 light-years
- Earth Similarity Index 0.150
- Travel time at Voyager 1 speed 3,558,821 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around K2-141
K2-141 c 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 |
|---|---|---|---|---|---|---|
| K2-141 b | Super-Earth | 1.51 | 4.97 | 0.280 | 2,103 | 2018 |
| K2-141 c this | Neptune-like | 7.00 | 8.00 | 7.749 | 695 | 2018 |
K2-141 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#202of 574
top 35.0%
This planet
7.00R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | K2-141 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 7.00 | 11.21 |
| Mass (M⊕) | 1.00 | 8.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.08 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.16 | 2.53 |
| Insolation (S⊕) | 1.00 | 39.10 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 8.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 301235044
Gaia DR2
Gaia DR2 2643952940813536768
Gaia DR3
Gaia DR3 2643952940813536768
System
K2-141
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.75 Earth days (2.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0683 AU.
Transit Fingerprint
Rp / R★
0.094000
Transit midpoint (BJD)
2,457,751.1546
Extended Orbital Architecture
Planet / star radius ratio
0.094000
Semi-major axis / stellar radius
21.590
RV semi-amplitude (K)
3.200 m/s
Transit mid-time (BJD)
2,457,751.1546
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
1.10000
Eq. Temperature
695K
(422 °C)
Insolation (S⊕)
39.10
Earth = 1.00
Earth Similarity (ESI)
0.150
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.
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
Malavolta et al. 2018Instrument
Kepler CCD Array
Publication
2018-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-141
Spectral Class
K-type orange
Effective Temperature
4,570 K — cooler than the Sun (5,778 K)
Estimated Age
6.30 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.681 R☉
Stellar Mass
0.708 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.620 dex
Stellar density
3.860 g/cm³
Systemic radial velocity
-3.62 km/s
Rotational v·sin i
3.00 km/s
Rotation period
15.17 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 18 bands
Astrometric Data
Parallax
16.133 mas
Total Proper Motion
118.904 mas/yr
PM Right Ascension
116.17 mas/yr
PM Declination
25.36 mas/yr
Galactic Cartesian (pc)
x = 0.987 · y = -0.158 · z = -0.021
Equatorial (J2000)
RA 350.91705° · Dec -1.18918°
Galactic ℓ, b
80.199° · -56.595°
Ecliptic λ, β
351.183° · 2.507°
HTM-20 index
851368038
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