Key parameters at a glance
- A radius of 13.31 Earth radii
- A mass of 136.67 Earth masses
- Surface gravity around 0.77 g
- An orbital period of 4.066 days
- Semi-major axis 0.0482 AU
- Equilibrium temperature 1,074 K (801 °C)
- Distance from Earth 669.88 light-years
- Earth Similarity Index 0.111
- Travel time at Voyager 1 speed 11,813,369 years
TOI-4145 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#791of 1771
top 44.6%
This planet
13.31R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-4145 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.31 | 11.21 |
| Mass (M⊕) | 1.00 | 136.67 | 317.83 |
| Density (g/cm³) | 5.51 | 0.32 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.77 | 2.53 |
| Insolation (S⊕) | 1.00 | 223.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 136.666 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 279947414
Gaia DR2
Gaia DR2 568619413331898240
Gaia DR3
Gaia DR3 568619413331898240
System
TOI-4145
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.07 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0482 AU.
Transit Fingerprint
Depth
2.015 %
Duration
2.106 h
Impact parameter b
0.800
Transit midpoint (BJD)
2,458,925.8821
Photometric dip
Transit produces a flux drop of 20,150 ppm lasting ≈ 2.11 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
12.070
Impact parameter (b)
0.800
RV semi-amplitude (K)
57.000 m/s
Transit mid-time (BJD)
2,458,925.8821
Angular separation (arcsec)
0.23500
Eq. Temperature
1,074K
(801 °C)
Insolation (S⊕)
223.00
Earth = 1.00
Earth Similarity (ESI)
0.111
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
Yee et al. 2023Instrument
TESS CCD Array
Publication
2023-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-4145 A
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,281 K — cooler than the Sun (5,778 K)
Estimated Age
4.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.859 R☉
Stellar Mass
0.905 M☉
Metallicity [Fe/H]
0.17
Extended Stellar Properties
Surface gravity (log g)
4.526 dex
Stellar density
2.010 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.840 mas
Total Proper Motion
17.842 mas/yr
PM Right Ascension
11.77 mas/yr
PM Declination
-13.41 mas/yr
Galactic Cartesian (pc)
x = 0.131 · y = 0.107 · z = 0.986
Equatorial (J2000)
RA 39.42974° · Dec 80.26738°
Galactic ℓ, b
127.501° · 18.352°
Ecliptic λ, β
75.091° · 59.493°
HTM-20 index
531478285
Similar Worlds
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HD 135625 b
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Kepler-454 d
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Kepler-539 c
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HD 159868 b
Gas Giant · G-type yellow (Sun-like)
Radius 13.30 R⊕ · 182.2 ly