Key parameters at a glance
- A radius of 2.65 Earth radii
- A mass of 7.51 Earth masses
- Surface gravity around 1.07 g
- An orbital period of 21.054 days
- Semi-major axis 0.1605 AU
- Equilibrium temperature 731 K (458 °C)
- Distance from Earth 5,021.60 light-years
- Earth Similarity Index 0.339
- Travel time at Voyager 1 speed 88,555,834 years
2 siblings around Kepler-603
Kepler-603 b 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 this | Sub-Neptune | 2.65 | 7.51 | 21.054 | 731 | 2016 |
| Kepler-603 c | Neptune-like | 6.50 | 34.50 | 127.908 | 401 | 2016 |
Kepler-603 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#946of 1978
top 47.8%
This planet
2.65R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-603 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.65 | 11.21 |
| Mass (M⊕) | 1.00 | 7.51 | 317.83 |
| Density (g/cm³) | 5.51 | 2.22 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.07 | 2.53 |
| Insolation (S⊕) | 1.00 | 97.80 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 270948636
Gaia DR2
Gaia DR2 2077556465126659456
Gaia DR3
Gaia DR3 2077556465126659456
System
Kepler-603
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 21.05 Earth days (5.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1605 AU.
Transit Fingerprint
Depth
0.050 %
Duration
7.214 h
Impact parameter b
0.873
Rp / R★
0.023750
Transit midpoint (BJD)
2,455,004.9243
Photometric dip
Transit produces a flux drop of 497 ppm lasting ≈ 7.21 h.
Extended Orbital Architecture
Planet / star radius ratio
0.023750
Semi-major axis / stellar radius
22.920
Impact parameter (b)
0.873
Transit mid-time (BJD)
2,455,004.9243
Angular separation (arcsec)
0.10400
Eq. Temperature
731K
(458 °C)
Insolation (S⊕)
97.80
Earth = 1.00
Earth Similarity (ESI)
0.339
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
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
Kepler-299 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.65 R⊕ · 3,431.9 ly
Kepler-109 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.65 R⊕ · 1,548.8 ly
Kepler-253 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.65 R⊕ · 2,735.1 ly
Kepler-375 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.65 R⊕ · 4,040.5 ly
Kepler-1924 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.65 R⊕ · 6,232.1 ly
Kepler-1548 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.64 R⊕ · 2,845.0 ly