Key parameters at a glance
- A radius of 1.66 Earth radii
- A mass of 3.39 Earth masses
- Surface gravity around 1.23 g
- An orbital period of 4.537 days
- Semi-major axis 0.0486 AU
- Equilibrium temperature 798 K (525 °C)
- Distance from Earth 1,933.16 light-years
- Earth Similarity Index 0.367
- Travel time at Voyager 1 speed 34,091,319 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1977 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#469of 1176
top 39.8%
This planet
1.66R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-1977 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.66 | 11.21 |
| Mass (M⊕) | 1.00 | 3.39 | 317.83 |
| Density (g/cm³) | 5.51 | 4.07 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.23 | 2.53 |
| Insolation (S⊕) | 1.00 | 95.61 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 122515768
Gaia DR2
Gaia DR2 2051027792165858304
Gaia DR3
Gaia DR3 2051027792165858304
System
Kepler-1977
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.54 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0486 AU.
Transit Fingerprint
Depth
0.050 %
Duration
1.813 h
Impact parameter b
0.706
Rp / R★
0.022053
Transit midpoint (BJD)
2,454,965.1846
Photometric dip
Transit produces a flux drop of 504 ppm lasting ≈ 1.81 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022053
Semi-major axis / stellar radius
14.160
Impact parameter (b)
0.706
Transit mid-time (BJD)
2,454,965.1846
Angular separation (arcsec)
0.08200
Eq. Temperature
798K
(525 °C)
Insolation (S⊕)
95.61
Earth = 1.00
Earth Similarity (ESI)
0.367
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
Valizadegan et al. 2023Instrument
Kepler CCD Array
Publication
2023-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Kepler (12 shown).
Host System: Kepler-1977
Spectral Class
K-type orange
Effective Temperature
4,805 K — cooler than the Sun (5,778 K)
Estimated Age
1.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.688 R☉
Stellar Mass
0.769 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.633 dex
Stellar density
2.610 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.659 mas
Total Proper Motion
14.803 mas/yr
PM Right Ascension
-14.25 mas/yr
PM Declination
4.02 mas/yr
Galactic Cartesian (pc)
x = 0.280 · y = -0.745 · z = 0.606
Equatorial (J2000)
RA 290.61786° · Dec 37.28910°
Galactic ℓ, b
69.659° · 10.409°
Ecliptic λ, β
302.352° · 58.434°
HTM-20 index
1860571089
Similar Worlds
Kepler-1418 b
Super-Earth · K-type orange
Radius 1.66 R⊕ · 1,627.5 ly
K2-318 b
Super-Earth · K-type orange
Radius 1.66 R⊕ · 482.3 ly
Kepler-1795 b
Super-Earth · K-type orange
Radius 1.66 R⊕ · —
Kepler-1687 b
Super-Earth · K-type orange
Radius 1.66 R⊕ · 1,360.1 ly
TOI-871 b
Super-Earth · K-type orange
Radius 1.66 R⊕ · 221.9 ly
Kepler-763 d
Super-Earth · K-type orange
Radius 1.67 R⊕ · 3,139.1 ly