Key parameters at a glance
- A radius of 11.65 Earth radii
- A mass of 184.02 Earth masses
- Surface gravity around 1.36 g
- An orbital period of 4.099 days
- Semi-major axis 0.0484 AU
- Equilibrium temperature 1,092 K (819 °C)
- Distance from Earth 1,086.24 light-years
- Earth Similarity Index 0.127
- Travel time at Voyager 1 speed 19,155,779 years
K2-30 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1574of 1771
top 88.8%
This planet
11.65R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | K2-30 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.65 | 11.21 |
| Mass (M⊕) | 1.00 | 184.02 | 317.83 |
| Density (g/cm³) | 5.51 | 0.64 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.36 | 2.53 |
| Insolation (S⊕) | 1.00 | 299.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 184.024 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 26017005
Gaia DR2
Gaia DR2 61607255708760960
Gaia DR3
Gaia DR3 61607255708760960
System
K2-30
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.10 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0484 AU.
Transit Fingerprint
Depth
1.603 %
Duration
2.321 h
Impact parameter b
0.662
Rp / R★
0.126600
Transit midpoint (BJD)
2,457,063.8071
Photometric dip
Transit produces a flux drop of 16,030 ppm lasting ≈ 2.32 h.
Extended Orbital Architecture
Planet / star radius ratio
0.126600
Semi-major axis / stellar radius
12.340
Impact parameter (b)
0.662
RV semi-amplitude (K)
78.700 m/s
Transit mid-time (BJD)
2,457,063.8071
Long. of periastron (ω)
120.00°
Angular separation (arcsec)
0.14500
Eq. Temperature
1,092K
(819 °C)
Insolation (S⊕)
299.00
Earth = 1.00
Earth Similarity (ESI)
0.127
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Johnson et al. 2016Instrument
Kepler CCD Array
Publication
2016-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-30
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,425 K — cooler than the Sun (5,778 K)
Estimated Age
3.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.844 R☉
Stellar Mass
0.900 M☉
Metallicity [Fe/H]
-0.15
Extended Stellar Properties
Surface gravity (log g)
4.540 dex
Stellar density
2.110 g/cm³
Systemic radial velocity
35.43 km/s
Rotational v·sin i
1.40 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
2.974 mas
Total Proper Motion
21.717 mas/yr
PM Right Ascension
16.58 mas/yr
PM Declination
-14.03 mas/yr
Galactic Cartesian (pc)
x = 0.565 · y = 0.732 · z = 0.379
Equatorial (J2000)
RA 52.34205° · Dec 22.29935°
Galactic ℓ, b
164.501° · -27.550°
Ecliptic λ, β
55.513° · 3.255°
HTM-20 index
-1839449227
Similar Worlds
HATS-14 b
Gas Giant · G-type yellow (Sun-like)
Radius 11.65 R⊕ · 1,673.2 ly
WASP-83 b
Gas Giant · G-type yellow (Sun-like)
Radius 11.66 R⊕ · 884.2 ly
TOI-3877 b
Gas Giant · G-type yellow (Sun-like)
Radius 11.68 R⊕ · 1,610.5 ly
TOI-6692 b
Gas Giant · G-type yellow (Sun-like)
Radius 11.68 R⊕ · 1,020.6 ly
TOI-5261 b
Gas Giant · G-type yellow (Sun-like)
Radius 11.60 R⊕ · 1,229.8 ly
HD 80606 b
Gas Giant · G-type yellow (Sun-like)
Radius 11.57 R⊕ · 216.8 ly