Key parameters at a glance
- A radius of 10.76 Earth radii
- A mass of 136.66 Earth masses
- Surface gravity around 1.18 g
- An orbital period of 3.579 days
- Semi-major axis 0.0450 AU
- Equilibrium temperature 1,440 K (1167 °C)
- Distance from Earth 2,085.48 light-years
- Earth Similarity Index 0.094
- Travel time at Voyager 1 speed 36,777,391 years
Kepler-77 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1693of 1771
top 95.5%
This planet
10.76R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Kepler-77 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.76 | 11.21 |
| Mass (M⊕) | 1.00 | 136.66 | 317.83 |
| Density (g/cm³) | 5.51 | 0.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 432.87 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 136.661 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 159098316
Gaia DR2
Gaia DR2 2126912305142208384
Gaia DR3
Gaia DR3 2126912305142208384
System
Kepler-77
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.58 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0450 AU.
Transit Fingerprint
Depth
0.985 %
Duration
2.934 h
Impact parameter b
0.341
Rp / R★
0.099240
Transit midpoint (BJD)
2,455,095.8657
Photometric dip
Transit produces a flux drop of 9,849 ppm lasting ≈ 2.93 h.
Extended Orbital Architecture
Planet / star radius ratio
0.099240
Semi-major axis / stellar radius
9.764
Impact parameter (b)
0.341
RV semi-amplitude (K)
59.200 m/s
Transit mid-time (BJD)
2,455,095.8657
Angular separation (arcsec)
0.07040
Eq. Temperature
1,440K
(1167 °C)
Insolation (S⊕)
432.87
Earth = 1.00
Earth Similarity (ESI)
0.094
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.
Orbital-brightness modulation
Host star brightness varies with the planet's orbit.
Discovery Paper
Primary reference
Gandolfi et al. 2013Instrument
Kepler CCD Array
Publication
2013-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2013 at Kepler (12 shown).
Host System: Kepler-77
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,520 K — cooler than the Sun (5,778 K)
Estimated Age
7.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.990 R☉
Stellar Mass
0.950 M☉
Metallicity [Fe/H]
0.20
Extended Stellar Properties
Surface gravity (log g)
4.420 dex
Stellar density
1.365 g/cm³
Systemic radial velocity
-24.76 km/s
Rotational v·sin i
1.50 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.535 mas
Total Proper Motion
2.637 mas/yr
PM Right Ascension
-2.60 mas/yr
PM Declination
-0.41 mas/yr
Galactic Cartesian (pc)
x = 0.240 · y = -0.674 · z = 0.699
Equatorial (J2000)
RA 289.60794° · Dec 44.34543°
Galactic ℓ, b
75.852° · 14.119°
Ecliptic λ, β
305.209° · 65.405°
HTM-20 index
134706520
Similar Worlds
TOI-5027 b
Gas Giant · G-type yellow (Sun-like)
Radius 10.76 R⊕ · 666.8 ly
TOI-2158 b
Gas Giant · G-type yellow (Sun-like)
Radius 10.76 R⊕ · 647.3 ly
Kepler-15 b
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TOI-375 b
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TOI-5210 b
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Kepler-725 b
Gas Giant · G-type yellow (Sun-like)
Radius 10.80 R⊕ · 2,473.8 ly