Key parameters at a glance
- A radius of 1.09 Earth radii
- A mass of 4.30 Earth masses
- Surface gravity around 3.62 g
- An orbital period of 1.434 days
- Semi-major axis 0.0183 AU
- Equilibrium temperature 708 K (435 °C)
- Distance from Earth 116.85 light-years
- Earth Similarity Index 0.326
- Travel time at Voyager 1 speed 2,060,603 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-5720 b Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#240of 570
top 41.9%
This planet
1.09R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | TOI-5720 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.09 | 11.21 |
| Mass (M⊕) | 1.00 | 4.30 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | 3.62 | 2.53 |
| Insolation (S⊕) | 1.00 | 41.70 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.300 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 230055368
Gaia DR2
Gaia DR2 3994047048130880384
Gaia DR3
Gaia DR3 3994047048130880384
System
TOI-5720
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.43 Earth days (0.4% of a terrestrial year) at a mean orbital distance of 0.0183 AU.
Transit Fingerprint
Depth
0.073 %
Duration
1.020 h
Impact parameter b
0.140
Rp / R★
0.027960
Transit midpoint (BJD)
2,460,076.9025
Photometric dip
Transit produces a flux drop of 725 ppm lasting ≈ 1.02 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027960
Semi-major axis / stellar radius
10.970
Impact parameter (b)
0.140
RV semi-amplitude (K)
64.000 m/s
Transit mid-time (BJD)
2,460,076.9025
Angular separation (arcsec)
0.51000
Eq. Temperature
708K
(435 °C)
Insolation (S⊕)
41.70
Earth = 1.00
Earth Similarity (ESI)
0.326
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
Barkaoui et al. 2024Instrument
TESS CCD Array
Publication
2024-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-5720
Spectral Class
M-type red dwarf
Effective Temperature
3,325 K — cooler than the Sun (5,778 K)
Estimated Age
5.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.383 R☉
Stellar Mass
0.383 M☉
Metallicity [Fe/H]
0.03
Extended Stellar Properties
Surface gravity (log g)
5.010 dex
Stellar density
9.615 g/cm³
Rotational v·sin i
3.40 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
27.885 mas
Total Proper Motion
362.116 mas/yr
PM Right Ascension
-350.37 mas/yr
PM Declination
-91.49 mas/yr
Galactic Cartesian (pc)
x = -0.891 · y = 0.152 · z = 0.427
Equatorial (J2000)
RA 170.31358° · Dec 25.27329°
Galactic ℓ, b
213.073° · 69.713°
Ecliptic λ, β
160.853° · 19.341°
HTM-20 index
-256162313
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