Key parameters at a glance
- A radius of 11.28 Earth radii
- A mass of 246.00 Earth masses
- Surface gravity around 1.93 g
- An orbital period of 48.367 days
- Semi-major axis 0.3050 AU
- Equilibrium temperature 676 K (403 °C)
- Distance from Earth 890.11 light-years
- Earth Similarity Index 0.229
- Travel time at Voyager 1 speed 15,697,073 years
1 sibling around K2-290
K2-290 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 |
|---|---|---|---|---|---|---|
| K2-290 b | Sub-Neptune | 3.06 | 10.90 | 9.212 | 1,230 | 2019 |
| K2-290 c this | Gas Giant | 11.28 | 246.00 | 48.367 | 676 | 2019 |
K2-290 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1621of 1771
top 91.5%
This planet
11.28R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | K2-290 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.28 | 11.21 |
| Mass (M⊕) | 1.00 | 246.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.01 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.93 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 246.000 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 Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 48.37 Earth days (13.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3050 AU.
Transit Fingerprint
Duration
8.140 h
Impact parameter b
0.474
Rp / R★
0.068480
Transit midpoint (BJD)
2,458,019.1733
Extended Orbital Architecture
Planet / star radius ratio
0.068480
Semi-major axis / stellar radius
43.500
Impact parameter (b)
0.474
RV semi-amplitude (K)
38.400 m/s
Transit mid-time (BJD)
2,458,019.1733
Long. of periastron (ω)
90.00°
Sky-projected obliquity (λ)
153.00°
True obliquity (ψ)
124.00°
Angular separation (arcsec)
1.12000
Eq. Temperature
676K
(403 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.229
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water.
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
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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