Key parameters at a glance
- A radius of 15.97 Earth radii
- A mass of 435.42 Earth masses
- Surface gravity around 1.71 g
- An orbital period of 2.305 days
- Semi-major axis 0.0356 AU
- Equilibrium temperature 1,984 K (1711 °C)
- Distance from Earth 2,104.67 light-years
- Earth Similarity Index 0.057
- Travel time at Voyager 1 speed 37,115,767 years
TOI-3523 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#165of 1771
top 9.3%
This planet
15.97R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-3523 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.97 | 11.21 |
| Mass (M⊕) | 1.00 | 435.42 | 317.83 |
| Density (g/cm³) | 5.51 | 0.59 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.71 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,590.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 435.425 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 417047499
Gaia DR2
Gaia DR2 2080811118319262080
Gaia DR3
Gaia DR3 2080811118319262080
System
TOI-3523
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.30 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0356 AU.
Transit Fingerprint
Depth
1.022 %
Duration
3.650 h
Impact parameter b
0.160
Transit midpoint (BJD)
2,460,417.4556
Photometric dip
Transit produces a flux drop of 10,220 ppm lasting ≈ 3.65 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
5.298
Impact parameter (b)
0.160
RV semi-amplitude (K)
194.000 m/s
Transit mid-time (BJD)
2,460,417.4556
Angular separation (arcsec)
0.05520
Eq. Temperature
1,984K
(1711 °C)
Insolation (S⊕)
2,590.00
Earth = 1.00
Earth Similarity (ESI)
0.057
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. 2025Instrument
TESS CCD Array
Publication
2025-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-3523 A
Spectral Class
F-type yellow-white
Effective Temperature
6,450 K — hotter than the Sun (5,778 K)
Estimated Age
4.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.448 R☉
Stellar Mass
1.131 M☉
Metallicity [Fe/H]
-0.37
Extended Stellar Properties
Surface gravity (log g)
4.171 dex
Stellar density
0.529 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
1.524 mas
Total Proper Motion
11.611 mas/yr
PM Right Ascension
0.66 mas/yr
PM Declination
-11.59 mas/yr
Galactic Cartesian (pc)
x = 0.413 · y = -0.605 · z = 0.681
Equatorial (J2000)
RA 304.28346° · Dec 42.90653°
Galactic ℓ, b
79.803° · 4.147°
Ecliptic λ, β
325.412° · 59.924°
HTM-20 index
357234410
Similar Worlds
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HAT-P-45 b
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WASP-73 b
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Radius 15.92 R⊕ · 753.9 ly