Key parameters at a glance
- A radius of 6.50 Earth radii
- A mass of 34.50 Earth masses
- Surface gravity around 0.82 g
- An orbital period of 127.908 days
- Semi-major axis 0.5344 AU
- Equilibrium temperature 401 K (128 °C)
- Distance from Earth 5,021.60 light-years
- Earth Similarity Index 0.395
- Travel time at Voyager 1 speed 88,555,834 years
2 siblings around Kepler-603
Kepler-603 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-603 d | Super-Earth | 1.32 | 2.30 | 6.217 | 1,098 | 2016 |
| Kepler-603 b | Sub-Neptune | 2.65 | 7.51 | 21.054 | 731 | 2016 |
| Kepler-603 c this | Neptune-like | 6.50 | 34.50 | 127.908 | 401 | 2016 |
Kepler-603 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#240of 574
top 41.6%
This planet
6.50R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-603 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.50 | 11.21 |
| Mass (M⊕) | 1.00 | 34.50 | 317.83 |
| Density (g/cm³) | 5.51 | 0.69 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.82 | 2.53 |
| Insolation (S⊕) | 1.00 | 8.80 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 270948636
Gaia DR2
Gaia DR2 2077556465126659456
Gaia DR3
Gaia DR3 2077556465126659456
System
Kepler-603
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 127.91 Earth days (35.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.5344 AU.
Transit Fingerprint
Depth
0.402 %
Duration
13.498 h
Impact parameter b
0.879
Rp / R★
0.058659
Transit midpoint (BJD)
2,455,079.4495
Photometric dip
Transit produces a flux drop of 4,021 ppm lasting ≈ 13.50 h.
Extended Orbital Architecture
Planet / star radius ratio
0.058659
Semi-major axis / stellar radius
34.300
Impact parameter (b)
0.879
Transit mid-time (BJD)
2,455,079.4495
Angular separation (arcsec)
0.34700
Eq. Temperature
401K
(128 °C)
Insolation (S⊕)
8.80
Earth = 1.00
Earth Similarity (ESI)
0.395
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
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-603
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,808 K — hotter than the Sun (5,778 K)
Estimated Age
4.37 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.010 R☉
Stellar Mass
1.010 M☉
Metallicity [Fe/H]
0.03
Extended Stellar Properties
Surface gravity (log g)
4.430 dex
Stellar density
0.350 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.623 mas
Total Proper Motion
4.115 mas/yr
PM Right Ascension
-2.83 mas/yr
PM Declination
-2.99 mas/yr
Galactic Cartesian (pc)
x = 0.304 · y = -0.674 · z = 0.673
Equatorial (J2000)
RA 294.28097° · Dec 42.29093°
Galactic ℓ, b
75.485° · 10.164°
Ecliptic λ, β
310.910° · 62.324°
HTM-20 index
-809231594
Similar Worlds
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TOI-5108 b
Neptune-like · G-type yellow (Sun-like)
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