Key parameters at a glance
- A radius of 4.74 Earth radii
- A mass of 20.20 Earth masses
- Surface gravity around 0.90 g
- An orbital period of 5.459 days
- Semi-major axis 0.0652 AU
- Equilibrium temperature 1,442 K (1169 °C)
- Distance from Earth 523.20 light-years
- Earth Similarity Index 0.127
- Travel time at Voyager 1 speed 9,226,629 years
1 sibling around TOI-5126
TOI-5126 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| TOI-5126 b this | Neptune-like | 4.74 | 20.20 | 5.459 | 1,442 | 2023 |
| TOI-5126 c | Sub-Neptune | 3.86 | 14.20 | 17.900 | 971 | 2023 |
TOI-5126 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#422of 574
top 73.3%
This planet
4.74R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-5126 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.74 | 11.21 |
| Mass (M⊕) | 1.00 | 20.20 | 317.83 |
| Density (g/cm³) | 5.51 | 1.04 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.90 | 2.53 |
| Insolation (S⊕) | 1.00 | 467.00 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 27064468
Gaia DR2
Gaia DR2 623633615066248576
Gaia DR3
Gaia DR3 623633615066248576
System
TOI-5126
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.46 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0652 AU.
Transit Fingerprint
Depth
0.123 %
Duration
3.726 h
Impact parameter b
0.240
Rp / R★
0.034980
Transit midpoint (BJD)
2,459,627.0386
Photometric dip
Transit produces a flux drop of 1,230 ppm lasting ≈ 3.73 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034980
Semi-major axis / stellar radius
11.320
Impact parameter (b)
0.240
Transit mid-time (BJD)
2,459,627.0386
Long. of periastron (ω)
0.00°
Angular separation (arcsec)
0.40600
Eq. Temperature
1,442K
(1169 °C)
Insolation (S⊕)
467.00
Earth = 1.00
Earth Similarity (ESI)
0.127
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Discovery Paper
Primary reference
Fairnington et al. 2023Instrument
TESS CCD Array
Publication
2023-10
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-5126
Spectral Class
F-type yellow-white
Effective Temperature
6,150 K — hotter than the Sun (5,778 K)
Estimated Age
0.80 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.241 R☉
Stellar Mass
1.240 M☉
Metallicity [Fe/H]
0.18
Extended Stellar Properties
Surface gravity (log g)
4.224 dex
Stellar density
0.922 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
6.206 mas
Total Proper Motion
55.614 mas/yr
PM Right Ascension
-54.59 mas/yr
PM Declination
-10.62 mas/yr
Galactic Cartesian (pc)
x = -0.834 · y = 0.450 · z = 0.320
Equatorial (J2000)
RA 151.65978° · Dec 18.63406°
Galactic ℓ, b
216.666° · 51.282°
Ecliptic λ, β
147.084° · 6.559°
HTM-20 index
-1006994725
Similar Worlds
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Neptune-like · F-type yellow-white
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Kepler-1000 b
Neptune-like · F-type yellow-white
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Kepler-1527 b
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Kepler-502 b
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HD 144899 b
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Kepler-1640 b
Neptune-like · F-type yellow-white
Radius 4.82 R⊕ · 6,065.8 ly