Key parameters at a glance
- A radius of 3.06 Earth radii
- A mass of 10.90 Earth masses
- Surface gravity around 1.16 g
- An orbital period of 9.212 days
- Semi-major axis 0.0923 AU
- Equilibrium temperature 1,230 K (957 °C)
- Distance from Earth 890.11 light-years
- Earth Similarity Index 0.210
- Travel time at Voyager 1 speed 15,697,073 years
1 sibling around K2-290
K2-290 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 |
|---|---|---|---|---|---|---|
| K2-290 b this | Sub-Neptune | 3.06 | 10.90 | 9.212 | 1,230 | 2019 |
| K2-290 c | Gas Giant | 11.28 | 246.00 | 48.367 | 676 | 2019 |
K2-290 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#466of 1978
top 23.5%
This planet
3.06R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-290 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.06 | 11.21 |
| Mass (M⊕) | 1.00 | 10.90 | 317.83 |
| Density (g/cm³) | 5.51 | 4.10 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.16 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 10.900 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 70803960
Gaia DR2
Gaia DR2 6253844468882760832
Gaia DR3
Gaia DR3 6253844468883543680
System
K2-290
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.21 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0923 AU.
Transit Fingerprint
Duration
4.960 h
Impact parameter b
0.438
Rp / R★
0.019000
Transit midpoint (BJD)
2,457,994.7725
Extended Orbital Architecture
Planet / star radius ratio
0.019000
Semi-major axis / stellar radius
13.150
Impact parameter (b)
0.438
RV semi-amplitude (K)
3.300 m/s
Transit mid-time (BJD)
2,457,994.7725
Long. of periastron (ω)
90.00°
Sky-projected obliquity (λ)
173.00°
Angular separation (arcsec)
0.33800
Eq. Temperature
1,230K
(957 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.210
0 = alien, 1 = Earth-identical
Insufficient insolation data — the dayside is scorched.
Discovery Paper
Primary reference
Hjorth et al. 2019Instrument
Kepler CCD Array
Publication
2019-04
Observation locale
Space
Discovery cohort
Planets confirmed in 2019 at K2 (12 shown).
Host System: K2-290
Spectral Class
F-type yellow-white
Effective Temperature
6,302 K — hotter than the Sun (5,778 K)
Estimated Age
4.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.511 R☉
Stellar Mass
1.194 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.230 dex
Stellar density
0.485 g/cm³
Systemic radial velocity
19.76 km/s
Rotational v·sin i
6.50 km/s
Rotation period
6.63 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.636 mas
Total Proper Motion
32.040 mas/yr
PM Right Ascension
27.22 mas/yr
PM Declination
-16.89 mas/yr
Galactic Cartesian (pc)
x = -0.540 · y = -0.767 · z = -0.345
Equatorial (J2000)
RA 234.85788° · Dec -20.19890°
Galactic ℓ, b
348.052° · 27.599°
Ecliptic λ, β
237.296° · -0.660°
HTM-20 index
-118211989
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