Key parameters at a glance
- A radius of 2.06 Earth radii
- A mass of 4.90 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 27.015 days
- Semi-major axis 0.1820 AU
- Equilibrium temperature 677 K (404 °C)
- Distance from Earth 2,686.89 light-years
- Earth Similarity Index 0.402
- Travel time at Voyager 1 speed 47,383,235 years
1 sibling around Kepler-377
Kepler-377 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-377 b | Super-Earth | 1.39 | 2.51 | 12.510 | 875 | 2014 |
| Kepler-377 c this | Sub-Neptune | 2.06 | 4.90 | 27.015 | 677 | 2014 |
Kepler-377 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1875of 1978
top 94.7%
This planet
2.06R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-377 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.06 | 11.21 |
| Mass (M⊕) | 1.00 | 4.90 | 317.83 |
| Density (g/cm³) | 5.51 | 3.08 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 49.86 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 184015535
Gaia DR2
Gaia DR2 2073157456550947200
Gaia DR3
Gaia DR3 2073157456550947200
System
Kepler-377
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 27.01 Earth days (7.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1820 AU.
Transit Fingerprint
Depth
0.029 %
Duration
5.776 h
Impact parameter b
0.340
Rp / R★
0.015809
Transit midpoint (BJD)
2,454,965.5084
Photometric dip
Transit produces a flux drop of 288 ppm lasting ≈ 5.78 h.
Extended Orbital Architecture
Planet / star radius ratio
0.015809
Semi-major axis / stellar radius
39.230
Impact parameter (b)
0.340
Transit mid-time (BJD)
2,454,965.5084
Angular separation (arcsec)
0.22100
Eq. Temperature
677K
(404 °C)
Insolation (S⊕)
49.86
Earth = 1.00
Earth Similarity (ESI)
0.402
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-377
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,949 K — hotter than the Sun (5,778 K)
Estimated Age
5.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.224 R☉
Stellar Mass
1.043 M☉
Metallicity [Fe/H]
0.05
Extended Stellar Properties
Surface gravity (log g)
4.303 dex
Stellar density
0.660 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.185 mas
Total Proper Motion
7.305 mas/yr
PM Right Ascension
7.27 mas/yr
PM Declination
-0.70 mas/yr
Galactic Cartesian (pc)
x = 0.335 · y = -0.705 · z = 0.626
Equatorial (J2000)
RA 295.42207° · Dec 38.73567°
Galactic ℓ, b
72.728° · 7.720°
Ecliptic λ, β
310.109° · 58.686°
HTM-20 index
-1936887137
Similar Worlds
Kepler-183 b
Sub-Neptune · G-type yellow (Sun-like)
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Kepler-832 b
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Kepler-1615 b
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Kepler-958 b
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HD 28471 d
Sub-Neptune · G-type yellow (Sun-like)
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Kepler-449 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.06 R⊕ · 789.1 ly