Key parameters at a glance
- A radius of 1.51 Earth radii
- A mass of 4.97 Earth masses
- Surface gravity around 2.18 g
- An orbital period of 0.280 days
- Semi-major axis 0.0075 AU
- Equilibrium temperature 2,103 K (1830 °C)
- Distance from Earth 201.80 light-years
- Earth Similarity Index 0.119
- 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 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 |
|---|---|---|---|---|---|---|
| K2-141 b this | Super-Earth | 1.51 | 4.97 | 0.280 | 2,103 | 2018 |
| K2-141 c | Neptune-like | 7.00 | 8.00 | 7.749 | 695 | 2018 |
K2-141 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#730of 1176
top 62.0%
This planet
1.51R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-141 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.51 | 11.21 |
| Mass (M⊕) | 1.00 | 4.97 | 317.83 |
| Density (g/cm³) | 5.51 | 7.93 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 3,260.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.970 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 Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 6.7 hours long on a nearly circular orbit at a mean orbital distance of 0.0075 AU.
Transit Fingerprint
Depth
0.051 %
Duration
0.940 h
Impact parameter b
-0.010
Rp / R★
0.020880
Transit midpoint (BJD)
2,457,744.0716
Photometric dip
Transit produces a flux drop of 507 ppm lasting ≈ 0.94 h.
Extended Orbital Architecture
Planet / star radius ratio
0.020880
Semi-major axis / stellar radius
2.292
Impact parameter (b)
-0.010
RV semi-amplitude (K)
6.100 m/s
Transit mid-time (BJD)
2,457,744.0716
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.12100
Eq. Temperature
2,103K
(1830 °C)
Insolation (S⊕)
3,260.00
Earth = 1.00
Earth Similarity (ESI)
0.119
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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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