Key parameters at a glance
- A radius of 12.78 Earth radii
- A mass of 731.01 Earth masses
- Surface gravity around 4.48 g
- An orbital period of 4.861 days
- Semi-major axis 0.0610 AU
- Equilibrium temperature 1,375 K (1102 °C)
- Distance from Earth 810.51 light-years
- Earth Similarity Index 0.113
- Travel time at Voyager 1 speed 14,293,356 years
TOI-1820 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1120of 1771
top 63.2%
This planet
12.78R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-1820 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.78 | 11.21 |
| Mass (M⊕) | 1.00 | 731.01 | 317.83 |
| Density (g/cm³) | 5.51 | 2.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.48 | 2.53 |
| Insolation (S⊕) | 1.00 | 292.25 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 731.005 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 393831507
Gaia DR2
Gaia DR2 4009018273332089088
Gaia DR3
Gaia DR3 4009018273332089088
System
TOI-1820
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.86 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0610 AU.
Transit Fingerprint
Depth
0.614 %
Duration
2.920 h
Impact parameter b
0.840
Rp / R★
0.077700
Transit midpoint (BJD)
2,458,903.0638
Photometric dip
Transit produces a flux drop of 6,140 ppm lasting ≈ 2.92 h.
Extended Orbital Architecture
Planet / star radius ratio
0.077700
Semi-major axis / stellar radius
8.700
Impact parameter (b)
0.840
RV semi-amplitude (K)
273.000 m/s
Transit mid-time (BJD)
2,458,903.0638
Long. of periastron (ω)
9.00°
Angular separation (arcsec)
0.24500
Eq. Temperature
1,375K
(1102 °C)
Insolation (S⊕)
292.25
Earth = 1.00
Earth Similarity (ESI)
0.113
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
Knudstrup et al. 2022Instrument
TESS CCD Array
Publication
2022-04
Observation locale
Space
Discovery cohort
Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1820
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,734 K — cooler than the Sun (5,778 K)
Estimated Age
11.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.510 R☉
Stellar Mass
1.040 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
4.240 dex
Stellar density
0.430 g/cm³
Rotational v·sin i
4.50 km/s
Rotation period
25.00 days
Activity index (log R'HK)
-5.370
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.996 mas
Total Proper Motion
60.878 mas/yr
PM Right Ascension
50.54 mas/yr
PM Declination
-33.93 mas/yr
Galactic Cartesian (pc)
x = -0.879 · y = -0.119 · z = 0.461
Equatorial (J2000)
RA 187.68672° · Dec 27.45200°
Galactic ℓ, b
207.720° · 85.392°
Ecliptic λ, β
175.155° · 28.046°
HTM-20 index
2095081063
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