Key parameters at a glance
- A radius of 2.60 Earth radii
- A mass of 7.27 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 13.733 days
- Semi-major axis 0.0960 AU
- Equilibrium temperature 502 K (229 °C)
- Distance from Earth 437.66 light-years
- Earth Similarity Index 0.487
- Travel time at Voyager 1 speed 7,718,173 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around K2-90
K2-90 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 |
|---|---|---|---|---|---|---|
| K2-90 c | Super-Earth | 1.30 | 2.24 | 2.901 | — | 2016 |
| K2-90 b this | Sub-Neptune | 2.60 | 7.27 | 13.733 | 502 | 2016 |
K2-90 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1017of 1978
top 51.4%
This planet
2.60R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-90 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.60 | 11.21 |
| Mass (M⊕) | 1.00 | 7.27 | 317.83 |
| Density (g/cm³) | 5.51 | 2.27 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 10.20 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 14111411
Gaia DR2
Gaia DR2 65331198513957376
Gaia DR3
Gaia DR3 65331198513957376
System
K2-90
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 13.73 Earth days (3.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0960 AU.
Transit Fingerprint
Depth
0.158 %
Duration
2.952 h
Impact parameter b
0.440
Rp / R★
0.038000
Transit midpoint (BJD)
2,457,078.6611
Photometric dip
Transit produces a flux drop of 1,582 ppm lasting ≈ 2.95 h.
Extended Orbital Architecture
Planet / star radius ratio
0.038000
Semi-major axis / stellar radius
33.400
Impact parameter (b)
0.440
Transit mid-time (BJD)
2,457,078.6611
Long. of periastron (ω)
16.40°
Angular separation (arcsec)
0.71500
Eq. Temperature
502K
(229 °C)
Insolation (S⊕)
10.20
Earth = 1.00
Earth Similarity (ESI)
0.487
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: K2-90
Spectral Class
K-type orange
Effective Temperature
4,484 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.619 R☉
Stellar Mass
0.629 M☉
Metallicity [Fe/H]
-0.23
Extended Stellar Properties
Surface gravity (log g)
4.653 dex
Stellar density
3.740 g/cm³
Systemic radial velocity
19.16 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
7.423 mas
Total Proper Motion
85.794 mas/yr
PM Right Ascension
72.81 mas/yr
PM Declination
-45.38 mas/yr
Galactic Cartesian (pc)
x = 0.474 · y = 0.793 · z = 0.382
Equatorial (J2000)
RA 59.15274° · Dec 22.47245°
Galactic ℓ, b
169.548° · -23.201°
Ecliptic λ, β
61.695° · 2.013°
HTM-20 index
-222436296
Similar Worlds
K2-155 c
Sub-Neptune · K-type orange
Radius 2.60 R⊕ · 237.4 ly
Kepler-505 b
Sub-Neptune · K-type orange
Radius 2.60 R⊕ · 924.4 ly
HD 48948 c
Sub-Neptune · K-type orange
Radius 2.60 R⊕ · 55.1 ly
Kepler-1362 b
Sub-Neptune · K-type orange
Radius 2.60 R⊕ · 2,385.2 ly
Kepler-665 b
Sub-Neptune · K-type orange
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HD 18599 b
Sub-Neptune · K-type orange
Radius 2.60 R⊕ · 125.8 ly