Key parameters at a glance
- A radius of 1.91 Earth radii
- A mass of 4.31 Earth masses
- Surface gravity around 1.18 g
- An orbital period of 5.736 days
- Semi-major axis 0.0532 AU
- Equilibrium temperature 565 K (292 °C)
- Distance from Earth 661.91 light-years
- Earth Similarity Index 0.490
- Travel time at Voyager 1 speed 11,672,796 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around K2-5
K2-5 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 |
|---|---|---|---|---|---|---|
| K2-5 b this | Super-Earth | 1.91 | 4.31 | 5.736 | 565 | 2015 |
| K2-5 c | Sub-Neptune | 2.26 | 5.73 | 10.932 | 456 | 2015 |
K2-5 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#114of 1176
top 9.6%
This planet
1.91R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-5 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.91 | 11.21 |
| Mass (M⊕) | 1.00 | 4.31 | 317.83 |
| Density (g/cm³) | 5.51 | 3.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 24.10 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 38064757
Gaia DR2
Gaia DR2 3791512745687354496
Gaia DR3
Gaia DR3 3791512745687354496
System
K2-5
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.74 Earth days (1.6% of a terrestrial year) at a mean orbital distance of 0.0532 AU.
Transit Fingerprint
Depth
0.150 %
Duration
2.654 h
Impact parameter b
0.650
Rp / R★
0.030310
Transit midpoint (BJD)
2,456,808.8600
Photometric dip
Transit produces a flux drop of 1,496 ppm lasting ≈ 2.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030310
Semi-major axis / stellar radius
14.000
Impact parameter (b)
0.650
Transit mid-time (BJD)
2,456,808.8600
Angular separation (arcsec)
0.26200
Eq. Temperature
565K
(292 °C)
Insolation (S⊕)
24.10
Earth = 1.00
Earth Similarity (ESI)
0.490
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
Montet et al. 2015Instrument
Kepler CCD Array
Publication
2015-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2015 at K2 (12 shown).
Host System: K2-5
Spectral Class
K-type orange
Effective Temperature
3,930 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.570 R☉
Stellar Mass
0.610 M☉
Metallicity [Fe/H]
-0.33
Extended Stellar Properties
Surface gravity (log g)
4.710 dex
Stellar density
4.405 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
4.899 mas
Total Proper Motion
35.111 mas/yr
PM Right Ascension
-11.07 mas/yr
PM Declination
33.32 mas/yr
Galactic Cartesian (pc)
x = -0.982 · y = 0.186 · z = -0.033
Equatorial (J2000)
RA 169.30346° · Dec -1.87783°
Galactic ℓ, b
261.144° · 53.173°
Ecliptic λ, β
170.904° · -5.961°
HTM-20 index
972305279
Similar Worlds
TOI-5789 d
Super-Earth · K-type orange
Radius 1.91 R⊕ · 66.7 ly
Kepler-753 b
Super-Earth · K-type orange
Radius 1.91 R⊕ · 896.2 ly
Kepler-1669 c
Super-Earth · K-type orange
Radius 1.90 R⊕ · 1,772.5 ly
K2-339 b
Super-Earth · K-type orange
Radius 1.92 R⊕ · 1,175.3 ly
K2-322 b
Super-Earth · K-type orange
Radius 1.92 R⊕ · 402.5 ly
K2-155 d
Super-Earth · K-type orange
Radius 1.90 R⊕ · 237.4 ly