Key parameters at a glance
- A radius of 11.14 Earth radii
- A mass of 308.93 Earth masses
- Surface gravity around 2.49 g
- An orbital period of 3.713 days
- Semi-major axis 0.0439 AU
- Equilibrium temperature 962 K (689 °C)
- Distance from Earth 418.23 light-years
- Earth Similarity Index 0.164
- Travel time at Voyager 1 speed 7,375,483 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-1811 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1644of 1771
top 92.8%
This planet
11.14R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-1811 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.14 | 11.21 |
| Mass (M⊕) | 1.00 | 308.93 | 317.83 |
| Density (g/cm³) | 5.51 | 1.23 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.49 | 2.53 |
| Insolation (S⊕) | 1.00 | 55.97 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 308.929 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 376524552
Gaia DR2
Gaia DR2 3962403923821595264
Gaia DR3
Gaia DR3 3962403923821595264
System
TOI-1811
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.71 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0439 AU.
Transit Fingerprint
Depth
1.761 %
Duration
1.951 h
Impact parameter b
0.739
Rp / R★
0.132720
Transit midpoint (BJD)
2,459,126.3685
Photometric dip
Transit produces a flux drop of 17,610 ppm lasting ≈ 1.95 h.
Extended Orbital Architecture
Planet / star radius ratio
0.132720
Semi-major axis / stellar radius
12.280
Impact parameter (b)
0.739
RV semi-amplitude (K)
146.000 m/s
Transit mid-time (BJD)
2,459,126.3685
Long. of periastron (ω)
21.00°
Angular separation (arcsec)
0.34200
Eq. Temperature
962K
(689 °C)
Insolation (S⊕)
55.97
Earth = 1.00
Earth Similarity (ESI)
0.164
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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
Rodriguez et al. 2023Instrument
TESS CCD Array
Publication
2023-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1811
Spectral Class
K-type orange
Effective Temperature
4,766 K — cooler than the Sun (5,778 K)
Estimated Age
5.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.769 R☉
Stellar Mass
0.817 M☉
Metallicity [Fe/H]
0.31
Extended Stellar Properties
Surface gravity (log g)
4.579 dex
Stellar density
2.540 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
7.770 mas
Total Proper Motion
47.120 mas/yr
PM Right Ascension
-45.87 mas/yr
PM Declination
-10.77 mas/yr
Galactic Cartesian (pc)
x = -0.879 · y = -0.138 · z = 0.457
Equatorial (J2000)
RA 188.92236° · Dec 27.21438°
Galactic ℓ, b
210.625° · 86.496°
Ecliptic λ, β
176.390° · 28.323°
HTM-20 index
1729141253
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