Key parameters at a glance
- A radius of 1.68 Earth radii
- A mass of 3.46 Earth masses
- Surface gravity around 1.23 g
- An orbital period of 3.756 days
- Semi-major axis 0.0453 AU
- Equilibrium temperature 977 K (704 °C)
- Distance from Earth 3,059.89 light-years
- Earth Similarity Index 0.295
- Travel time at Voyager 1 speed 53,961,179 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-778 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#435of 1176
top 36.9%
This planet
1.68R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-778 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.68 | 11.21 |
| Mass (M⊕) | 1.00 | 3.46 | 317.83 |
| Density (g/cm³) | 5.51 | 4.01 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.23 | 2.53 |
| Insolation (S⊕) | 1.00 | 216.57 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158484518
Gaia DR2
Gaia DR2 2106046632461881856
Gaia DR3
Gaia DR3 2106046632461881856
System
Kepler-778
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.76 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0453 AU.
Transit Fingerprint
Depth
0.042 %
Duration
2.297 h
Impact parameter b
0.127
Rp / R★
0.019985
Transit midpoint (BJD)
2,454,966.4329
Photometric dip
Transit produces a flux drop of 417 ppm lasting ≈ 2.30 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019985
Semi-major axis / stellar radius
12.670
Impact parameter (b)
0.127
Transit mid-time (BJD)
2,454,966.4329
Angular separation (arcsec)
0.04830
Eq. Temperature
977K
(704 °C)
Insolation (S⊕)
216.57
Earth = 1.00
Earth Similarity (ESI)
0.295
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
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-778
Spectral Class
K-type orange
Effective Temperature
5,102 K — cooler than the Sun (5,778 K)
Estimated Age
5.25 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.770 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
-0.09
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
2.727 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.038 mas
Total Proper Motion
8.734 mas/yr
PM Right Ascension
6.22 mas/yr
PM Declination
-6.13 mas/yr
Galactic Cartesian (pc)
x = 0.215 · y = -0.683 · z = 0.698
Equatorial (J2000)
RA 287.47749° · Dec 44.23747°
Galactic ℓ, b
75.117° · 15.472°
Ecliptic λ, β
301.616° · 65.769°
HTM-20 index
1129038095
Similar Worlds
Kepler-844 b
Super-Earth · K-type orange
Radius 1.68 R⊕ · 1,408.3 ly
TOI-2411 b
Super-Earth · K-type orange
Radius 1.68 R⊕ · 194.2 ly
Kepler-1266 c
Super-Earth · K-type orange
Radius 1.68 R⊕ · 2,770.1 ly
Kepler-167 c
Super-Earth · K-type orange
Radius 1.67 R⊕ · 1,115.2 ly
K2-381 d
Super-Earth · K-type orange
Radius 1.69 R⊕ · 475.2 ly
Kepler-1802 b
Super-Earth · K-type orange
Radius 1.67 R⊕ · 2,076.6 ly