Key parameters at a glance
- A radius of 11.78 Earth radii
- A mass of 953.49 Earth masses
- Surface gravity around 6.87 g
- An orbital period of 6.180 days
- Semi-major axis 0.0723 AU
- Equilibrium temperature 1,401 K (1128 °C)
- Distance from Earth 1,215.36 light-years
- Earth Similarity Index 0.118
- Travel time at Voyager 1 speed 21,432,901 years
EPIC 246851721 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1560of 1771
top 88.0%
This planet
11.78R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | EPIC 246851721 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.78 | 11.21 |
| Mass (M⊕) | 1.00 | 953.49 | 317.83 |
| Density (g/cm³) | 5.51 | 3.10 | 1.33 |
| Surface Gravity (g) | 1.00 | 6.87 | 2.53 |
| Insolation (S⊕) | 1.00 | 642.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 953.490 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 953.490 M⊕ | Lower bound from radial-velocity fitting. |
| Computed mass | 955.580 M⊕ | Model-computed mass (e.g. from mass-radius relation). |
Star Catalogue Identifiers
TIC
TIC 411839167
Gaia DR2
Gaia DR2 3393939026234131584
Gaia DR3
Gaia DR3 3393939030531019520
System
EPIC 246851721
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.18 Earth days (1.7% of a terrestrial year) at a mean orbital distance of 0.0723 AU.
Transit Fingerprint
Depth
0.464 %
Duration
4.108 h
Impact parameter b
0.647
Rp / R★
0.068100
Transit midpoint (BJD)
2,457,865.1103
Photometric dip
Transit produces a flux drop of 4,640 ppm lasting ≈ 4.11 h.
Extended Orbital Architecture
Planet / star radius ratio
0.068100
Semi-major axis / stellar radius
9.800
Impact parameter (b)
0.647
RV semi-amplitude (K)
270.000 m/s
Transit mid-time (BJD)
2,457,865.1103
Sky-projected obliquity (λ)
-1.47°
True obliquity (ψ)
3.70°
Angular separation (arcsec)
0.19400
Eq. Temperature
1,401K
(1128 °C)
Insolation (S⊕)
642.00
Earth = 1.00
Earth Similarity (ESI)
0.118
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
Yu et al. 2018Instrument
Kepler CCD Array
Publication
2018-12
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: EPIC 246851721
Spectral Class
F-type yellow-white
Effective Temperature
6,202 K — hotter than the Sun (5,778 K)
Estimated Age
3.02 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.586 R☉
Stellar Mass
1.317 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
4.157 dex
Stellar density
0.465 g/cm³
Systemic radial velocity
36.85 km/s
Rotational v·sin i
74.92 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
2.664 mas
Total Proper Motion
13.264 mas/yr
PM Right Ascension
2.72 mas/yr
PM Declination
-12.98 mas/yr
Galactic Cartesian (pc)
x = 0.184 · y = 0.942 · z = 0.280
Equatorial (J2000)
RA 78.91982° · Dec 16.27870°
Galactic ℓ, b
186.975° · -12.641°
Ecliptic λ, β
79.290° · -6.750°
HTM-20 index
-1297712520
Similar Worlds
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TOI-201 b
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TOI-5153 b
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Gas Giant · F-type yellow-white
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TOI-628 b
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Radius 11.88 R⊕ · 582.8 ly