Key parameters at a glance
- A radius of 11.13 Earth radii
- A mass of 4,513.16 Earth masses
- Surface gravity around 36.43 g
- An orbital period of 2,800.000 days
- Semi-major axis 4.2800 AU
- Distance from Earth 371.25 light-years
- Earth Similarity Index 0.307
- Travel time at Voyager 1 speed 6,546,942 years
1 sibling around TOI-201
TOI-201 c 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-201 b | Gas Giant | 11.83 | 184.34 | 52.978 | 759 | 2021 |
| TOI-201 c this | Gas Giant | 11.13 | 4,513.16 | 2,800.000 | — | 2025 |
TOI-201 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1647of 1771
top 92.9%
This planet
11.13R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-201 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.13 | 11.21 |
| Mass (M⊕) | 1.00 | 4,513.16 | 317.83 |
| Density (g/cm³) | 5.51 | 19.20 | 1.33 |
| Surface Gravity (g) | 1.00 | 36.43 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4,513.163 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 39474
HIP
HIP 27515
TIC
TIC 350618622
Gaia DR2
Gaia DR2 4767547667180525696
Gaia DR3
Gaia DR3 4767547667180525696
System
TOI-201
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 7.67 Earth years on a highly eccentric trajectory at a mean orbital distance of 4.2800 AU.
Transit Fingerprint
Duration
14.000 h
Impact parameter b
0.440
Rp / R★
0.074490
Transit midpoint (BJD)
2,460,062.5930
Extended Orbital Architecture
Planet / star radius ratio
0.074490
Impact parameter (b)
0.440
RV semi-amplitude (K)
221.000 m/s
Transit mid-time (BJD)
2,460,062.5930
Long. of periastron (ω)
95.20°
Angular separation (arcsec)
37.60000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.307
0 = alien, 1 = Earth-identical
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
Maciejewski & & & 321 Oboda 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-201
Spectral Class
F-type yellow-white
Effective Temperature
6,394 K — hotter than the Sun (5,778 K)
Estimated Age
0.87 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.339 R☉
Stellar Mass
1.316 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.318 dex
Stellar density
0.810 g/cm³
Systemic radial velocity
16.91 km/s
Rotational v·sin i
9.52 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
8.757 mas
Total Proper Motion
66.896 mas/yr
PM Right Ascension
7.73 mas/yr
PM Declination
66.45 mas/yr
Galactic Cartesian (pc)
x = 0.026 · y = 0.574 · z = -0.818
Equatorial (J2000)
RA 87.40178° · Dec -54.91042°
Galactic ℓ, b
262.849° · -30.629°
Ecliptic λ, β
82.623° · -78.283°
HTM-20 index
831307443
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