Key parameters at a glance
- A radius of 12.44 Earth radii
- A mass of 4,131.79 Earth masses
- Surface gravity around 26.69 g
- An orbital period of 3,650.000 days
- Semi-major axis 4.5000 AU
- Equilibrium temperature 183 K (-90 °C)
- Distance from Earth 1,800.01 light-years
- Earth Similarity Index 0.257
- Travel time at Voyager 1 speed 31,743,162 years
EPIC 248847494 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1287of 1771
top 72.6%
This planet
12.44R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | EPIC 248847494 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.44 | 11.21 |
| Mass (M⊕) | 1.00 | 4,131.79 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | 26.69 | 2.53 |
| Insolation (S⊕) | 1.00 | 0.19 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4,131.790 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 392876254
Gaia DR2
Gaia DR2 3882879683758393344
Gaia DR3
Gaia DR3 3882879683758393344
System
EPIC 248847494
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 9.99 Earth years on a nearly circular orbit at a mean orbital distance of 4.5000 AU.
Transit Fingerprint
Depth
0.180 %
Duration
53.600 h
Impact parameter b
0.790
Rp / R★
0.042000
Transit midpoint (BJD)
2,457,967.1700
Photometric dip
Transit produces a flux drop of 1,800 ppm lasting ≈ 53.60 h.
Extended Orbital Architecture
Planet / star radius ratio
0.042000
Impact parameter (b)
0.790
Transit mid-time (BJD)
2,457,967.1700
Angular separation (arcsec)
8.15000
Eq. Temperature
183K
(-90 °C)
Insolation (S⊕)
0.19
Earth = 1.00
Earth Similarity (ESI)
0.257
0 = alien, 1 = Earth-identical
Beyond the outer HZ boundary (too cold) — surface water would be frozen.
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
Giles et al. 2018Instrument
Kepler CCD Array
Publication
2018-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: EPIC 248847494
Spectral Class
K-type orange
Effective Temperature
4,898 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
2.700 R☉
Stellar Mass
0.900 M☉
Metallicity [Fe/H]
-0.23
Extended Stellar Properties
Surface gravity (log g)
3.520 dex
Stellar density
0.064 g/cm³
Systemic radial velocity
30.58 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
1.783 mas
Total Proper Motion
38.762 mas/yr
PM Right Ascension
-38.74 mas/yr
PM Declination
1.21 mas/yr
Galactic Cartesian (pc)
x = -0.916 · y = 0.345 · z = 0.205
Equatorial (J2000)
RA 159.38908° · Dec 11.84275°
Galactic ℓ, b
232.289° · 55.103°
Ecliptic λ, β
156.527° · 2.938°
HTM-20 index
-1842724207
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