Key parameters at a glance
- A radius of 11.94 Earth radii
- A mass of 2,606.19 Earth masses
- Surface gravity around 18.29 g
- An orbital period of 6.962 days
- Semi-major axis 0.0753 AU
- Equilibrium temperature 1,213 K (940 °C)
- Distance from Earth 2,070.15 light-years
- Earth Similarity Index 0.132
- Travel time at Voyager 1 speed 36,507,116 years
TOI-6420 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1523of 1771
top 85.9%
This planet
11.94R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-6420 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.94 | 11.21 |
| Mass (M⊕) | 1.00 | 2,606.19 | 317.83 |
| Density (g/cm³) | 5.51 | 8.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 18.29 | 2.53 |
| Insolation (S⊕) | 1.00 | 106.62 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,606.193 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 143526233
Gaia DR2
Gaia DR2 5707456527828738048
Gaia DR3
Gaia DR3 5707456527828738048
System
TOI-6420
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.96 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0753 AU.
Transit Fingerprint
Depth
0.649 %
Duration
2.750 h
Impact parameter b
0.849
Rp / R★
0.083500
Transit midpoint (BJD)
2,459,909.2703
Photometric dip
Transit produces a flux drop of 6,490 ppm lasting ≈ 2.75 h.
Extended Orbital Architecture
Planet / star radius ratio
0.083500
Semi-major axis / stellar radius
12.330
Impact parameter (b)
0.849
RV semi-amplitude (K)
785.000 m/s
Transit mid-time (BJD)
2,459,909.2703
Long. of periastron (ω)
48.40°
Angular separation (arcsec)
0.11900
Eq. Temperature
1,213K
(940 °C)
Insolation (S⊕)
106.62
Earth = 1.00
Earth Similarity (ESI)
0.132
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
Schulte et al. 2025Instrument
TESS CCD Array
Publication
2025-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-6420
Spectral Class
F-type yellow-white
Effective Temperature
6,020 K — hotter than the Sun (5,778 K)
Estimated Age
4.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.312 R☉
Stellar Mass
1.165 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.268 dex
Stellar density
0.726 g/cm³
Rotational v·sin i
6.42 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
1.548 mas
Total Proper Motion
9.041 mas/yr
PM Right Ascension
-8.85 mas/yr
PM Declination
1.87 mas/yr
Galactic Cartesian (pc)
x = -0.549 · y = 0.769 · z = -0.328
Equatorial (J2000)
RA 125.54430° · Dec -19.12429°
Galactic ℓ, b
240.635° · 10.073°
Ecliptic λ, β
133.684° · -37.328°
HTM-20 index
-517980567
Similar Worlds
HD 457 b
Gas Giant · F-type yellow-white
Radius 11.90 R⊕ · 179.5 ly
HD 26161 b
Gas Giant · F-type yellow-white
Radius 11.90 R⊕ · 133.4 ly
TOI-5110 b
Gas Giant · F-type yellow-white
Radius 11.98 R⊕ · 1,279.4 ly
WASP-117 b
Gas Giant · F-type yellow-white
Radius 11.88 R⊕ · 515.2 ly
TOI-628 b
Gas Giant · F-type yellow-white
Radius 11.88 R⊕ · 582.8 ly
TOI-5153 b
Gas Giant · F-type yellow-white
Radius 11.88 R⊕ · 1,273.6 ly