Key parameters at a glance
- A radius of 12.17 Earth radii
- A mass of 1,147.36 Earth masses
- Surface gravity around 7.74 g
- An orbital period of 14.574 days
- Semi-major axis 0.1291 AU
- Equilibrium temperature 1,061 K (788 °C)
- Distance from Earth 1,313.20 light-years
- Earth Similarity Index 0.163
- Travel time at Voyager 1 speed 23,158,314 years
TOI-558 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1442of 1771
top 81.4%
This planet
12.17R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-558 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.17 | 11.21 |
| Mass (M⊕) | 1.00 | 1,147.36 | 317.83 |
| Density (g/cm³) | 5.51 | 3.50 | 1.33 |
| Surface Gravity (g) | 1.00 | 7.74 | 2.53 |
| Insolation (S⊕) | 1.00 | 248.86 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,147.361 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 207110080
Gaia DR2
Gaia DR2 4727755005637190016
Gaia DR3
Gaia DR3 4727755005637190016
System
TOI-558
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 14.57 Earth days (4.0% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1291 AU.
Transit Fingerprint
Depth
0.557 %
Duration
2.705 h
Impact parameter b
0.907
Rp / R★
0.074600
Transit midpoint (BJD)
2,458,871.0725
Photometric dip
Transit produces a flux drop of 5,570 ppm lasting ≈ 2.71 h.
Extended Orbital Architecture
Planet / star radius ratio
0.074600
Semi-major axis / stellar radius
18.560
Impact parameter (b)
0.907
RV semi-amplitude (K)
257.100 m/s
Transit mid-time (BJD)
2,458,871.0725
Long. of periastron (ω)
132.30°
Angular separation (arcsec)
0.32100
Eq. Temperature
1,061K
(788 °C)
Insolation (S⊕)
248.86
Earth = 1.00
Earth Similarity (ESI)
0.163
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Ikwut Ukwa et al. 2022Instrument
TESS CCD Array
Publication
2022-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-558
Spectral Class
F-type yellow-white
Effective Temperature
6,466 K — hotter than the Sun (5,778 K)
Estimated Age
1.79 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.496 R☉
Stellar Mass
1.349 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.218 dex
Stellar density
0.568 g/cm³
Rotational v·sin i
7.80 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.455 mas
Total Proper Motion
4.005 mas/yr
PM Right Ascension
1.07 mas/yr
PM Declination
3.86 mas/yr
Galactic Cartesian (pc)
x = 0.392 · y = 0.356 · z = -0.848
Equatorial (J2000)
RA 42.29151° · Dec -58.02468°
Galactic ℓ, b
277.395° · -52.870°
Ecliptic λ, β
358.462° · -66.929°
HTM-20 index
1808600582
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