Key parameters at a glance
- A radius of 10.37 Earth radii
- A mass of 105.84 Earth masses
- Surface gravity around 0.98 g
- An orbital period of 4.347 days
- Semi-major axis 0.0543 AU
- Equilibrium temperature 1,534 K (1261 °C)
- Distance from Earth 1,069.55 light-years
- Earth Similarity Index 0.086
- Travel time at Voyager 1 speed 18,861,576 years
TOI-2421 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1741of 1771
top 98.2%
This planet
10.37R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-2421 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.37 | 11.21 |
| Mass (M⊕) | 1.00 | 105.84 | 317.83 |
| Density (g/cm³) | 5.51 | 0.52 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.98 | 2.53 |
| Insolation (S⊕) | 1.00 | 923.60 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 105.837 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 70524163
Gaia DR2
Gaia DR2 4968289907406396160
Gaia DR3
Gaia DR3 4968289907406396160
System
TOI-2421
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.35 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0543 AU.
Transit Fingerprint
Depth
0.295 %
Duration
4.862 h
Impact parameter b
0.409
Transit midpoint (BJD)
2,458,957.0277
Photometric dip
Transit produces a flux drop of 2,949 ppm lasting ≈ 4.86 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
6.670
Impact parameter (b)
0.409
RV semi-amplitude (K)
37.800 m/s
Transit mid-time (BJD)
2,458,957.0277
Angular separation (arcsec)
0.16600
Eq. Temperature
1,534K
(1261 °C)
Insolation (S⊕)
923.60
Earth = 1.00
Earth Similarity (ESI)
0.086
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. 2022Instrument
TESS CCD Array
Publication
2022-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2421
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,607 K — cooler than the Sun (5,778 K)
Estimated Age
7.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.750 R☉
Stellar Mass
1.131 M☉
Metallicity [Fe/H]
0.19
Extended Stellar Properties
Surface gravity (log g)
4.005 dex
Stellar density
0.297 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.021 mas
Total Proper Motion
29.143 mas/yr
PM Right Ascension
28.91 mas/yr
PM Declination
-3.64 mas/yr
Galactic Cartesian (pc)
x = 0.683 · y = 0.446 · z = -0.579
Equatorial (J2000)
RA 33.15402° · Dec -35.39092°
Galactic ℓ, b
243.467° · -70.835°
Ecliptic λ, β
14.666° · -45.130°
HTM-20 index
-540295686
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