Key parameters at a glance
- A radius of 2.83 Earth radii
- A mass of 13.31 Earth masses
- Surface gravity around 1.66 g
- An orbital period of 3.737 days
- Semi-major axis 0.0482 AU
- Equilibrium temperature 1,509 K (1236 °C)
- Distance from Earth 368.42 light-years
- Earth Similarity Index 0.159
- Travel time at Voyager 1 speed 6,497,074 years
1 sibling around TOI-2458
TOI-2458 b 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-2458 b this | Sub-Neptune | 2.83 | 13.31 | 3.737 | 1,509 | 2024 |
| TOI-2458 c | Sub-Neptune | 3.18 | 10.22 | 16.553 | — | 2024 |
TOI-2458 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#703of 1978
top 35.5%
This planet
2.83R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-2458 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.83 | 11.21 |
| Mass (M⊕) | 1.00 | 13.31 | 317.83 |
| Density (g/cm³) | 5.51 | 3.23 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.66 | 2.53 |
| Insolation (S⊕) | 1.00 | 865.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 13.310 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 34562
TIC
TIC 449197831
Gaia DR2
Gaia DR2 3233785128901216128
Gaia DR3
Gaia DR3 3233785128901216128
System
TOI-2458
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.74 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0482 AU.
Transit Fingerprint
Depth
0.039 %
Duration
2.130 h
Impact parameter b
0.847
Rp / R★
0.019800
Transit midpoint (BJD)
2,459,177.4046
Photometric dip
Transit produces a flux drop of 392 ppm lasting ≈ 2.13 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019800
Impact parameter (b)
0.847
RV semi-amplitude (K)
5.310 m/s
Transit mid-time (BJD)
2,459,177.4046
Long. of periastron (ω)
-26.00°
Angular separation (arcsec)
0.42700
Eq. Temperature
1,509K
(1236 °C)
Insolation (S⊕)
865.00
Earth = 1.00
Earth Similarity (ESI)
0.159
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
& Scaron Ubjak 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-2458
Spectral Class
F-type yellow-white
Effective Temperature
6,005 K — hotter than the Sun (5,778 K)
Estimated Age
5.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.310 R☉
Stellar Mass
1.050 M☉
Metallicity [Fe/H]
-0.10
Extended Stellar Properties
Surface gravity (log g)
4.200 dex
Stellar density
0.659 g/cm³
Rotational v·sin i
2.50 km/s
Rotation period
8.90 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
8.824 mas
Total Proper Motion
99.311 mas/yr
PM Right Ascension
-3.09 mas/yr
PM Declination
-99.26 mas/yr
Galactic Cartesian (pc)
x = 0.180 · y = 0.983 · z = 0.022
Equatorial (J2000)
RA 79.62153° · Dec 1.25344°
Galactic ℓ, b
200.689° · -19.943°
Ecliptic λ, β
78.812° · -21.784°
HTM-20 index
126928714
Similar Worlds
Kepler-264 c
Sub-Neptune · F-type yellow-white
Radius 2.83 R⊕ · 3,073.0 ly
Kepler-1738 b
Sub-Neptune · F-type yellow-white
Radius 2.82 R⊕ · 4,249.4 ly
Kepler-1724 b
Sub-Neptune · F-type yellow-white
Radius 2.84 R⊕ · 3,459.8 ly
Kepler-410 A b
Sub-Neptune · F-type yellow-white
Radius 2.84 R⊕ · 481.2 ly
Kepler-527 b
Sub-Neptune · F-type yellow-white
Radius 2.84 R⊕ · 2,446.3 ly
TOI-6054.02
Sub-Neptune · F-type yellow-white
Radius 2.82 R⊕ · 259.0 ly