Key parameters at a glance
- A radius of 9.10 Earth radii
- A mass of 8,899.20 Earth masses
- Surface gravity around 107.43 g
- An orbital period of 5.377 days
- Semi-major axis 0.0619 AU
- Equilibrium temperature 1,369 K (1096 °C)
- Distance from Earth 1,128.96 light-years
- Earth Similarity Index 0.068
- Travel time at Voyager 1 speed 19,909,202 years
TOI-5422 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#79of 574
top 13.6%
This planet
9.10R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-5422 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.10 | 11.21 |
| Mass (M⊕) | 1.00 | 8,899.20 | 317.83 |
| Density (g/cm³) | 5.51 | 65.80 | 1.33 |
| Surface Gravity (g) | 1.00 | 107.43 | 2.53 |
| Insolation (S⊕) | 1.00 | 580.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 8,899.195 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 8,867.413 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 80611440
Gaia DR2
Gaia DR2 3429244825638569216
Gaia DR3
Gaia DR3 3429244825638569216
System
TOI-5422
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.38 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0619 AU.
Transit Fingerprint
Depth
0.321 %
Duration
4.668 h
Impact parameter b
0.200
Rp / R★
0.056620
Transit midpoint (BJD)
2,459,961.6761
Photometric dip
Transit produces a flux drop of 3,206 ppm lasting ≈ 4.67 h.
Extended Orbital Architecture
Planet / star radius ratio
0.056620
Semi-major axis / stellar radius
9.080
Impact parameter (b)
0.200
RV semi-amplitude (K)
3,068.000 m/s
Transit mid-time (BJD)
2,459,961.6761
Long. of periastron (ω)
0.10°
Angular separation (arcsec)
0.17900
Eq. Temperature
1,369K
(1096 °C)
Insolation (S⊕)
580.00
Earth = 1.00
Earth Similarity (ESI)
0.068
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
Zhang et al. 2026Instrument
TESS CCD Array
Publication
2026-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2026 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-5422
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,820 K — hotter than the Sun (5,778 K)
Estimated Age
7.60 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.474 R☉
Stellar Mass
1.066 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.135 dex
Stellar density
0.479 g/cm³
Rotation period
10.80 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.862 mas
Total Proper Motion
8.359 mas/yr
PM Right Ascension
8.36 mas/yr
PM Declination
-0.15 mas/yr
Galactic Cartesian (pc)
x = 0.050 · y = 0.900 · z = 0.432
Equatorial (J2000)
RA 86.84362° · Dec 25.62603°
Galactic ℓ, b
183.032° · -1.386°
Ecliptic λ, β
87.148° · 2.218°
HTM-20 index
-1060658068
Similar Worlds
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Neptune-like · G-type yellow (Sun-like)
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Kepler-702 b
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Kepler-1654 b
Neptune-like · G-type yellow (Sun-like)
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