Key parameters at a glance
- A radius of 13.67 Earth radii
- A mass of 788.21 Earth masses
- Surface gravity around 4.21 g
- An orbital period of 3.582 days
- Semi-major axis 0.0400 AU
- Equilibrium temperature 725 K (452 °C)
- Distance from Earth 616.47 light-years
- Earth Similarity Index 0.220
- Travel time at Voyager 1 speed 10,871,460 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-4201 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#598of 1771
top 33.7%
This planet
13.67R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-4201 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.67 | 11.21 |
| Mass (M⊕) | 1.00 | 788.21 | 317.83 |
| Density (g/cm³) | 5.51 | 1.82 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.21 | 2.53 |
| Insolation (S⊕) | 1.00 | 45.20 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 788.214 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 95057860
Gaia DR2
Gaia DR2 2997312063605005056
Gaia DR3
Gaia DR3 2997312063605005056
System
TOI-4201
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.58 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0400 AU.
Transit Fingerprint
Depth
3.685 %
Duration
2.231 h
Impact parameter b
0.499
Rp / R★
0.195500
Transit midpoint (BJD)
2,458,470.9619
Photometric dip
Transit produces a flux drop of 36,850 ppm lasting ≈ 2.23 h.
Extended Orbital Architecture
Planet / star radius ratio
0.195500
Semi-major axis / stellar radius
13.694
Impact parameter (b)
0.499
RV semi-amplitude (K)
456.300 m/s
Transit mid-time (BJD)
2,458,470.9619
Long. of periastron (ω)
130.00°
Sky-projected obliquity (λ)
-3.00°
True obliquity (ψ)
21.30°
Angular separation (arcsec)
0.21200
Eq. Temperature
725K
(452 °C)
Insolation (S⊕)
45.20
Earth = 1.00
Earth Similarity (ESI)
0.220
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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
Gan et al. 2023Instrument
TESS CCD Array
Publication
2023-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-4201
Spectral Class
M-type red dwarf
Effective Temperature
3,794 K — cooler than the Sun (5,778 K)
Estimated Age
1.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.630 R☉
Stellar Mass
0.610 M☉
Metallicity [Fe/H]
0.52
Extended Stellar Properties
Surface gravity (log g)
4.640 dex
Stellar density
3.786 g/cm³
Systemic radial velocity
42.10 km/s
Rotational v·sin i
1.65 km/s
Rotation period
17.30 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.262 mas
Total Proper Motion
13.261 mas/yr
PM Right Ascension
11.72 mas/yr
PM Declination
6.20 mas/yr
Galactic Cartesian (pc)
x = -0.008 · y = 0.972 · z = -0.233
Equatorial (J2000)
RA 90.47472° · Dec -13.46137°
Galactic ℓ, b
219.661° · -16.965°
Ecliptic λ, β
90.573° · -36.900°
HTM-20 index
300215931
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