Key parameters at a glance
- A radius of 14.07 Earth radii
- A mass of 349.61 Earth masses
- Surface gravity around 1.77 g
- An orbital period of 3.280 days
- Semi-major axis 0.0444 AU
- Equilibrium temperature 1,529 K (1256 °C)
- Distance from Earth 816.98 light-years
- Earth Similarity Index 0.083
- Travel time at Voyager 1 speed 14,407,528 years
TOI-858 B b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#404of 1771
top 22.8%
This planet
14.07R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-858 B b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.07 | 11.21 |
| Mass (M⊕) | 1.00 | 349.61 | 317.83 |
| Density (g/cm³) | 5.51 | 0.69 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.77 | 2.53 |
| Insolation (S⊕) | 1.00 | 908.90 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 349.611 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 198008005
Gaia DR2
Gaia DR2 4683737294569921664
Gaia DR3
Gaia DR3 4683737294569921664
System
TOI-858
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.28 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0444 AU.
Transit Fingerprint
Depth
0.974 %
Duration
3.602 h
Impact parameter b
0.419
Transit midpoint (BJD)
2,458,386.4524
Photometric dip
Transit produces a flux drop of 9,740 ppm lasting ≈ 3.60 h.
Extended Orbital Architecture
Impact parameter (b)
0.419
RV semi-amplitude (K)
143.000 m/s
Transit mid-time (BJD)
2,458,386.4524
Sky-projected obliquity (λ)
99.30°
Angular separation (arcsec)
0.17700
Eq. Temperature
1,529K
(1256 °C)
Insolation (S⊕)
908.90
Earth = 1.00
Earth Similarity (ESI)
0.083
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
Hagelberg et al. 2023Instrument
TESS CCD Array
Publication
2023-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-858 B
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,842 K — hotter than the Sun (5,778 K)
Estimated Age
6.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.308 R☉
Stellar Mass
1.081 M☉
Metallicity [Fe/H]
0.15
Extended Stellar Properties
Surface gravity (log g)
4.238 dex
Stellar density
0.680 g/cm³
Rotational v·sin i
5.80 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 10 bands
Astrometric Data
Parallax
3.963 mas
Total Proper Motion
15.547 mas/yr
PM Right Ascension
11.00 mas/yr
PM Declination
-10.99 mas/yr
Galactic Cartesian (pc)
x = 0.288 · y = 0.503 · z = -0.815
Equatorial (J2000)
RA 60.19983° · Dec -54.59292°
Galactic ℓ, b
264.984° · -46.143°
Ecliptic λ, β
25.452° · -71.404°
HTM-20 index
1166375966
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