Key parameters at a glance
- A radius of 2.71 Earth radii
- A mass of 7.80 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 25.762 days
- Semi-major axis 0.1790 AU
- Equilibrium temperature 633 K (360 °C)
- Distance from Earth 4,671.11 light-years
- Earth Similarity Index 0.387
- Travel time at Voyager 1 speed 82,374,992 years
1 sibling around Kepler-355
Kepler-355 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-355 b | Super-Earth | 1.46 | 2.73 | 11.032 | 840 | 2014 |
| Kepler-355 c this | Sub-Neptune | 2.71 | 7.80 | 25.762 | 633 | 2014 |
Kepler-355 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#849of 1978
top 42.9%
This planet
2.71R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-355 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.71 | 11.21 |
| Mass (M⊕) | 1.00 | 7.80 | 317.83 |
| Density (g/cm³) | 5.51 | 2.15 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 49.97 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 279915745
Gaia DR2
Gaia DR2 2105535462635217792
Gaia DR3
Gaia DR3 2105535462635217792
System
Kepler-355
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 25.76 Earth days (7.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1790 AU.
Transit Fingerprint
Depth
0.062 %
Duration
6.816 h
Impact parameter b
0.260
Rp / R★
0.022795
Transit midpoint (BJD)
2,454,980.7046
Photometric dip
Transit produces a flux drop of 620 ppm lasting ≈ 6.82 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022795
Semi-major axis / stellar radius
16.100
Impact parameter (b)
0.260
Transit mid-time (BJD)
2,454,980.7046
Angular separation (arcsec)
0.12500
Eq. Temperature
633K
(360 °C)
Insolation (S⊕)
49.97
Earth = 1.00
Earth Similarity (ESI)
0.387
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-355
Spectral Class
F-type yellow-white
Effective Temperature
6,184 K — hotter than the Sun (5,778 K)
Estimated Age
10.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.066 R☉
Stellar Mass
0.933 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.441 dex
Stellar density
0.590 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.669 mas
Total Proper Motion
9.759 mas/yr
PM Right Ascension
6.48 mas/yr
PM Declination
-7.30 mas/yr
Galactic Cartesian (pc)
x = 0.200 · y = -0.706 · z = 0.680
Equatorial (J2000)
RA 285.79949° · Dec 42.81174°
Galactic ℓ, b
73.263° · 16.045°
Ecliptic λ, β
297.892° · 64.728°
HTM-20 index
1191306485
Similar Worlds
Kepler-1543 b
Sub-Neptune · F-type yellow-white
Radius 2.71 R⊕ · 3,006.5 ly
Kepler-655 b
Sub-Neptune · F-type yellow-white
Radius 2.71 R⊕ · 2,454.5 ly
Kepler-1807 b
Sub-Neptune · F-type yellow-white
Radius 2.70 R⊕ · 4,237.8 ly
Kepler-1677 b
Sub-Neptune · F-type yellow-white
Radius 2.70 R⊕ · 2,398.5 ly
Kepler-228 c
Sub-Neptune · F-type yellow-white
Radius 2.70 R⊕ · 5,364.0 ly
Kepler-1452 b
Sub-Neptune · F-type yellow-white
Radius 2.70 R⊕ · 3,249.6 ly