Key parameters at a glance
- A radius of 1.47 Earth radii
- A mass of 2.76 Earth masses
- Surface gravity around 1.28 g
- An orbital period of 5.728 days
- Semi-major axis 0.0519 AU
- Equilibrium temperature 569 K (296 °C)
- Distance from Earth 1,445.22 light-years
- Earth Similarity Index 0.530
- Travel time at Voyager 1 speed 25,486,397 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-777 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#802of 1176
top 68.1%
This planet
1.47R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-777 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.47 | 11.21 |
| Mass (M⊕) | 1.00 | 2.76 | 317.83 |
| Density (g/cm³) | 5.51 | 4.77 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.28 | 2.53 |
| Insolation (S⊕) | 1.00 | 33.95 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 123497954
Gaia DR2
Gaia DR2 2105358166383528192
Gaia DR3
Gaia DR3 2105358166383528192
System
Kepler-777
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.73 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0519 AU.
Transit Fingerprint
Depth
0.064 %
Duration
1.980 h
Impact parameter b
0.056
Rp / R★
0.024205
Transit midpoint (BJD)
2,454,968.1808
Photometric dip
Transit produces a flux drop of 643 ppm lasting ≈ 1.98 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024205
Semi-major axis / stellar radius
22.605
Impact parameter (b)
0.056
Transit mid-time (BJD)
2,454,968.1808
Angular separation (arcsec)
0.11700
Eq. Temperature
569K
(296 °C)
Insolation (S⊕)
33.95
Earth = 1.00
Earth Similarity (ESI)
0.530
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-777
Spectral Class
K-type orange
Effective Temperature
4,043 K — cooler than the Sun (5,778 K)
Estimated Age
3.16 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.560 R☉
Stellar Mass
0.580 M☉
Metallicity [Fe/H]
-0.17
Extended Stellar Properties
Surface gravity (log g)
4.710 dex
Stellar density
5.773 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.229 mas
Total Proper Motion
11.295 mas/yr
PM Right Ascension
7.83 mas/yr
PM Declination
8.14 mas/yr
Galactic Cartesian (pc)
x = 0.158 · y = -0.698 · z = 0.699
Equatorial (J2000)
RA 282.72411° · Dec 44.34651°
Galactic ℓ, b
73.917° · 18.677°
Ecliptic λ, β
293.513° · 66.750°
HTM-20 index
-266444366
Similar Worlds
Kepler-137 b
Super-Earth · K-type orange
Radius 1.47 R⊕ · 988.2 ly
Kepler-1756 b
Super-Earth · K-type orange
Radius 1.47 R⊕ · —
Kepler-1826 b
Super-Earth · K-type orange
Radius 1.48 R⊕ · 1,099.0 ly
TOI-1798.02
Super-Earth · K-type orange
Radius 1.46 R⊕ · 369.1 ly
Kepler-1019 b
Super-Earth · K-type orange
Radius 1.46 R⊕ · 633.3 ly
Kepler-190 c
Super-Earth · K-type orange
Radius 1.46 R⊕ · 1,413.5 ly