Key parameters at a glance
- A radius of 5.30 Earth radii
- A mass of 26.40 Earth masses
- Surface gravity around 0.94 g
- An orbital period of 4.418 days
- Semi-major axis 0.0485 AU
- Equilibrium temperature 899 K (626 °C)
- Distance from Earth 645.48 light-years
- Earth Similarity Index 0.207
- Travel time at Voyager 1 speed 11,383,080 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-3568 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#342of 574
top 59.4%
This planet
5.30R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-3568 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.30 | 11.21 |
| Mass (M⊕) | 1.00 | 26.40 | 317.83 |
| Density (g/cm³) | 5.51 | 0.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.94 | 2.53 |
| Insolation (S⊕) | 1.00 | 130.15 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 26.400 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 160390955
Gaia DR2
Gaia DR2 1950477552581609984
Gaia DR3
Gaia DR3 1950477552581609984
System
TOI-3568
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.42 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0485 AU.
Transit Fingerprint
Depth
0.679 %
Duration
2.450 h
Impact parameter b
0.500
Rp / R★
0.067000
Transit midpoint (BJD)
2,459,799.3834
Photometric dip
Transit produces a flux drop of 6,790 ppm lasting ≈ 2.45 h.
Extended Orbital Architecture
Planet / star radius ratio
0.067000
Semi-major axis / stellar radius
13.100
Impact parameter (b)
0.500
RV semi-amplitude (K)
12.100 m/s
Transit mid-time (BJD)
2,459,799.3834
Long. of periastron (ω)
-0.90°
Angular separation (arcsec)
0.24500
Eq. Temperature
899K
(626 °C)
Insolation (S⊕)
130.15
Earth = 1.00
Earth Similarity (ESI)
0.207
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
Martioli et al. 2024Instrument
TESS CCD Array
Publication
2024-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-3568
Spectral Class
K-type orange
Effective Temperature
4,969 K — cooler than the Sun (5,778 K)
Estimated Age
6.10 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.719 R☉
Stellar Mass
0.780 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.630 dex
Stellar density
2.950 g/cm³
Systemic radial velocity
-97.80 km/s
Rotational v·sin i
1.40 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.024 mas
Total Proper Motion
27.457 mas/yr
PM Right Ascension
26.35 mas/yr
PM Declination
-7.72 mas/yr
Galactic Cartesian (pc)
x = 0.653 · y = -0.499 · z = 0.570
Equatorial (J2000)
RA 322.60237° · Dec 34.73958°
Galactic ℓ, b
82.695° · -11.990°
Ecliptic λ, β
340.492° · 46.166°
HTM-20 index
1702556507
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