Key parameters at a glance
- A radius of 10.76 Earth radii
- A mass of 260.62 Earth masses
- Surface gravity around 2.25 g
- An orbital period of 8.601 days
- Semi-major axis 0.0750 AU
- Equilibrium temperature 1,188 K (915 °C)
- Distance from Earth 647.33 light-years
- Earth Similarity Index 0.130
- Travel time at Voyager 1 speed 11,415,692 years
TOI-2158 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1696of 1771
top 95.7%
This planet
10.76R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-2158 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.76 | 11.21 |
| Mass (M⊕) | 1.00 | 260.62 | 317.83 |
| Density (g/cm³) | 5.51 | 1.14 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.25 | 2.53 |
| Insolation (S⊕) | 1.00 | 81.50 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 260.619 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 342642208
Gaia DR2
Gaia DR2 4525545299652540672
Gaia DR3
Gaia DR3 4525545299652540672
System
TOI-2158
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.60 Earth days (2.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0750 AU.
Transit Fingerprint
Depth
0.509 %
Duration
3.770 h
Impact parameter b
0.860
Rp / R★
0.070000
Transit midpoint (BJD)
2,459,018.9225
Photometric dip
Transit produces a flux drop of 5,090 ppm lasting ≈ 3.77 h.
Extended Orbital Architecture
Planet / star radius ratio
0.070000
Semi-major axis / stellar radius
11.400
Impact parameter (b)
0.860
RV semi-amplitude (K)
75.000 m/s
Transit mid-time (BJD)
2,459,018.9225
Long. of periastron (ω)
52.00°
Angular separation (arcsec)
0.37800
Eq. Temperature
1,188K
(915 °C)
Insolation (S⊕)
81.50
Earth = 1.00
Earth Similarity (ESI)
0.130
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
Knudstrup et al. 2022Instrument
TESS CCD Array
Publication
2022-04
Observation locale
Space
Discovery cohort
Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2158
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,673 K — cooler than the Sun (5,778 K)
Estimated Age
8.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.410 R☉
Stellar Mass
1.120 M☉
Metallicity [Fe/H]
0.47
Extended Stellar Properties
Surface gravity (log g)
4.190 dex
Stellar density
0.560 g/cm³
Rotational v·sin i
3.70 km/s
Rotation period
19.00 days
Activity index (log R'HK)
-5.060
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.010 mas
Total Proper Motion
44.699 mas/yr
PM Right Ascension
-44.00 mas/yr
PM Declination
7.89 mas/yr
Galactic Cartesian (pc)
x = 0.111 · y = -0.930 · z = 0.351
Equatorial (J2000)
RA 276.81005° · Dec 20.52689°
Galactic ℓ, b
48.933° · 14.343°
Ecliptic λ, β
278.840° · 43.757°
HTM-20 index
1366803309
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