Key parameters at a glance
- A radius of 16.25 Earth radii
- An orbital period of 5.210 days
- Semi-major axis 0.0560 AU
- Equilibrium temperature 904 K (631 °C)
- Distance from Earth 591.58 light-years
- Earth Similarity Index 0.071
- Travel time at Voyager 1 speed 10,432,544 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-5143 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#143of 1771
top 8.0%
This planet
16.25R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-5143 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 16.25 | 11.21 |
| Mass (M⊕) | 1.00 | — | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | — | 2.53 |
| Insolation (S⊕) | 1.00 | 158.16 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 281837575
Gaia DR2
Gaia DR2 3815937670648091392
Gaia DR3
Gaia DR3 3815937670648091392
System
TOI-5143
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.21 Earth days (1.4% of a terrestrial year) at a mean orbital distance of 0.0560 AU.
Transit Fingerprint
Depth
1.139 %
Duration
1.698 h
Impact parameter b
0.980
Rp / R★
0.175000
Transit midpoint (BJD)
2,459,527.2426
Photometric dip
Transit produces a flux drop of 11,395 ppm lasting ≈ 1.70 h.
Extended Orbital Architecture
Planet / star radius ratio
0.175000
Semi-major axis / stellar radius
14.140
Impact parameter (b)
0.980
Transit mid-time (BJD)
2,459,527.2426
Sky-projected obliquity (λ)
2.10°
Angular separation (arcsec)
0.30900
Eq. Temperature
904K
(631 °C)
Insolation (S⊕)
158.16
Earth = 1.00
Earth Similarity (ESI)
0.071
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.
Discovery Paper
Primary reference
Radzom et al. 2025Instrument
TESS CCD Array
Publication
2025-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-5143
Spectral Class
K-type orange
Effective Temperature
5,183 K — cooler than the Sun (5,778 K)
Estimated Age
7.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.852 R☉
Stellar Mass
0.864 M☉
Metallicity [Fe/H]
0.11
Extended Stellar Properties
Surface gravity (log g)
4.514 dex
Stellar density
2.070 g/cm³
Rotational v·sin i
2.53 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
5.485 mas
Total Proper Motion
49.260 mas/yr
PM Right Ascension
-49.26 mas/yr
PM Declination
-0.12 mas/yr
Galactic Cartesian (pc)
x = -0.964 · y = 0.252 · z = 0.090
Equatorial (J2000)
RA 165.36512° · Dec 5.13948°
Galactic ℓ, b
248.030° · 55.806°
Ecliptic λ, β
164.537° · -1.026°
HTM-20 index
-484116227
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