Key parameters at a glance
- A radius of 2.95 Earth radii
- A mass of 9.01 Earth masses
- Surface gravity around 1.04 g
- An orbital period of 4.400 days
- Semi-major axis 0.0497 AU
- Equilibrium temperature 848 K (575 °C)
- Distance from Earth 914.93 light-years
- Earth Similarity Index 0.279
- Travel time at Voyager 1 speed 16,134,724 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around K2-270
K2-270 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 |
|---|---|---|---|---|---|---|
| K2-270 b | Super-Earth | 1.38 | 2.48 | 1.543 | 1,203 | 2018 |
| K2-270 c this | Sub-Neptune | 2.95 | 9.01 | 4.400 | 848 | 2018 |
K2-270 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#557of 1978
top 28.1%
This planet
2.95R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-270 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.95 | 11.21 |
| Mass (M⊕) | 1.00 | 9.01 | 317.83 |
| Density (g/cm³) | 5.51 | 1.93 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.04 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 293375721
Gaia DR2
Gaia DR2 608395625151767680
Gaia DR3
Gaia DR3 608395625151767680
System
K2-270
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.40 Earth days (1.2% of a terrestrial year) at a mean orbital distance of 0.0497 AU.
Transit Fingerprint
Depth
0.168 %
Duration
1.560 h
Impact parameter b
0.380
Rp / R★
0.035000
Transit midpoint (BJD)
2,457,142.9751
Photometric dip
Transit produces a flux drop of 1,682 ppm lasting ≈ 1.56 h.
Extended Orbital Architecture
Planet / star radius ratio
0.035000
Semi-major axis / stellar radius
20.940
Impact parameter (b)
0.380
Transit mid-time (BJD)
2,457,142.9751
Angular separation (arcsec)
0.17700
Eq. Temperature
848K
(575 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.279
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Livingston et al. 2018Instrument
Kepler CCD Array
Publication
2018-12
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-270
Spectral Class
K-type orange
Effective Temperature
4,877 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.770 R☉
Stellar Mass
0.850 M☉
Metallicity [Fe/H]
0.26
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
1.886 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.536 mas
Total Proper Motion
25.670 mas/yr
PM Right Ascension
-11.82 mas/yr
PM Declination
-22.79 mas/yr
Galactic Cartesian (pc)
x = -0.641 · y = 0.731 · z = 0.234
Equatorial (J2000)
RA 131.26656° · Dec 13.54973°
Galactic ℓ, b
213.091° · 31.228°
Ecliptic λ, β
130.016° · -4.342°
HTM-20 index
-411806528
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