Key parameters at a glance
- A radius of 15.28 Earth radii
- A mass of 225.66 Earth masses
- Surface gravity around 0.97 g
- An orbital period of 4.040 days
- Semi-major axis 0.0493 AU
- Equilibrium temperature 1,376 K (1103 °C)
- Distance from Earth 1,019.81 light-years
- Earth Similarity Index 0.081
- Travel time at Voyager 1 speed 17,984,260 years
TOI-2818 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#211of 1771
top 11.9%
This planet
15.28R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-2818 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.28 | 11.21 |
| Mass (M⊕) | 1.00 | 225.66 | 317.83 |
| Density (g/cm³) | 5.51 | 0.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.97 | 2.53 |
| Insolation (S⊕) | 1.00 | 598.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 225.658 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 151483286
Gaia DR2
Gaia DR2 5545555570947605376
Gaia DR3
Gaia DR3 5545555570947605376
System
TOI-2818
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.04 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0493 AU.
Transit Fingerprint
Depth
1.300 %
Duration
3.804 h
Impact parameter b
0.340
Transit midpoint (BJD)
2,459,023.4464
Photometric dip
Transit produces a flux drop of 13,000 ppm lasting ≈ 3.80 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
8.630
Impact parameter (b)
0.340
RV semi-amplitude (K)
91.000 m/s
Transit mid-time (BJD)
2,459,023.4464
Angular separation (arcsec)
0.15800
Eq. Temperature
1,376K
(1103 °C)
Insolation (S⊕)
598.00
Earth = 1.00
Earth Similarity (ESI)
0.081
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
Yee et al. 2023Instrument
TESS CCD Array
Publication
2023-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2818
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,721 K — cooler than the Sun (5,778 K)
Estimated Age
9.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.229 R☉
Stellar Mass
0.977 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
4.250 dex
Stellar density
0.745 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.170 mas
Total Proper Motion
10.889 mas/yr
PM Right Ascension
-6.10 mas/yr
PM Declination
-9.02 mas/yr
Galactic Cartesian (pc)
x = -0.397 · y = 0.715 · z = -0.575
Equatorial (J2000)
RA 119.05982° · Dec -35.11671°
Galactic ℓ, b
251.037° · -3.394°
Ecliptic λ, β
132.921° · -54.310°
HTM-20 index
1416759231
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