Key parameters at a glance
- A radius of 14.68 Earth radii
- A mass of 1,102.82 Earth masses
- Surface gravity around 5.12 g
- An orbital period of 1.900 days
- Semi-major axis 0.0295 AU
- Equilibrium temperature 1,550 K (1277 °C)
- Distance from Earth 2,494.73 light-years
- Earth Similarity Index 0.097
- Travel time at Voyager 1 speed 43,994,585 years
CoRoT-18 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#263of 1771
top 14.8%
This planet
14.68R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | CoRoT-18 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.68 | 11.21 |
| Mass (M⊕) | 1.00 | 1,102.82 | 317.83 |
| Density (g/cm³) | 5.51 | 2.20 | 1.33 |
| Surface Gravity (g) | 1.00 | 5.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 823.70 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,102.820 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 37168957
Gaia DR2
Gaia DR2 3120058170178779392
Gaia DR3
Gaia DR3 3120058170178779392
System
CoRoT-18
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.90 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0295 AU.
Transit Fingerprint
Depth
2.572 %
Duration
2.387 h
Impact parameter b
0.400
Rp / R★
0.134100
Transit midpoint (BJD)
2,455,321.7241
Photometric dip
Transit produces a flux drop of 25,717 ppm lasting ≈ 2.39 h.
Extended Orbital Architecture
Planet / star radius ratio
0.134100
Semi-major axis / stellar radius
6.350
Impact parameter (b)
0.400
RV semi-amplitude (K)
590.000 m/s
Transit mid-time (BJD)
2,455,321.7241
Sky-projected obliquity (λ)
-10.00°
True obliquity (ψ)
20.00°
Angular separation (arcsec)
0.03860
Eq. Temperature
1,550K
(1277 °C)
Insolation (S⊕)
823.70
Earth = 1.00
Earth Similarity (ESI)
0.097
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Hebrard et al. 2011Instrument
CoRoT CCD Array
Publication
2011-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2011 at CoRoT (5 shown).
Host System: CoRoT-18
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,440 K — cooler than the Sun (5,778 K)
Estimated Age
0.60 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.000 R☉
Stellar Mass
0.950 M☉
Metallicity [Fe/H]
-0.10
Extended Stellar Properties
Surface gravity (log g)
4.400 dex
Stellar density
1.350 g/cm³
Systemic radial velocity
29.55 km/s
Rotational v·sin i
8.00 km/s
Rotation period
5.40 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.281 mas
Total Proper Motion
4.010 mas/yr
PM Right Ascension
2.33 mas/yr
PM Declination
-3.26 mas/yr
Galactic Cartesian (pc)
x = -0.142 · y = 0.990 · z = -0.001
Equatorial (J2000)
RA 98.17242° · Dec -0.03160°
Galactic ℓ, b
210.819° · -4.185°
Ecliptic λ, β
98.894° · -23.219°
HTM-20 index
1618374437
Similar Worlds
Kepler-17 b
Gas Giant · G-type yellow (Sun-like)
Radius 14.68 R⊕ · 2,350.8 ly
WASP-127 b
Gas Giant · G-type yellow (Sun-like)
Radius 14.70 R⊕ · 520.2 ly
Kepler-6 b
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HATS-1 b
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HAT-P-53 b
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HAT-P-1 b
Gas Giant · G-type yellow (Sun-like)
Radius 14.78 R⊕ · 518.5 ly