Key parameters at a glance
- A radius of 14.61 Earth radii
- A mass of 397.29 Earth masses
- Surface gravity around 1.86 g
- An orbital period of 3.954 days
- Semi-major axis 0.0545 AU
- Equilibrium temperature 1,639 K (1366 °C)
- Distance from Earth 1,562.76 light-years
- Earth Similarity Index 0.076
- Travel time at Voyager 1 speed 27,559,274 years
TOI-4487 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#268of 1771
top 15.1%
This planet
14.61R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-4487 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.61 | 11.21 |
| Mass (M⊕) | 1.00 | 397.29 | 317.83 |
| Density (g/cm³) | 5.51 | 0.70 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.86 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,203.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 397.286 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 193754373
Gaia DR2
Gaia DR2 2083061376251298688
Gaia DR3
Gaia DR3 2083061376251298688
System
TOI-4487
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.95 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0545 AU.
Transit Fingerprint
Depth
0.669 %
Duration
4.270 h
Impact parameter b
0.394
Transit midpoint (BJD)
2,460,079.0200
Photometric dip
Transit produces a flux drop of 6,690 ppm lasting ≈ 4.27 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
7.160
Impact parameter (b)
0.394
RV semi-amplitude (K)
130.000 m/s
Transit mid-time (BJD)
2,460,079.0200
Angular separation (arcsec)
0.11400
Eq. Temperature
1,639K
(1366 °C)
Insolation (S⊕)
1,203.00
Earth = 1.00
Earth Similarity (ESI)
0.076
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-4487 A
Spectral Class
F-type yellow-white
Effective Temperature
6,206 K — hotter than the Sun (5,778 K)
Estimated Age
2.45 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.634 R☉
Stellar Mass
1.378 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.150 dex
Stellar density
0.445 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.059 mas
Total Proper Motion
13.425 mas/yr
PM Right Ascension
-0.62 mas/yr
PM Declination
-13.41 mas/yr
Galactic Cartesian (pc)
x = 0.413 · y = -0.559 · z = 0.719
Equatorial (J2000)
RA 306.42208° · Dec 45.97103°
Galactic ℓ, b
83.203° · 4.622°
Ecliptic λ, β
331.169° · 61.899°
HTM-20 index
1968466547
Similar Worlds
WASP-169 b
Gas Giant · F-type yellow-white
Radius 14.62 R⊕ · 2,045.2 ly
CoRoT-21 b
Gas Giant · F-type yellow-white
Radius 14.57 R⊕ · 4,562.4 ly
HAT-P-24 b
Gas Giant · F-type yellow-white
Radius 14.57 R⊕ · 1,354.7 ly
KELT-6 b
Gas Giant · F-type yellow-white
Radius 14.57 R⊕ · 785.1 ly
TOI-1107 b
Gas Giant · F-type yellow-white
Radius 14.57 R⊕ · 917.5 ly
TOI-3474 b
Gas Giant · F-type yellow-white
Radius 14.67 R⊕ · 1,370.3 ly