Key parameters at a glance
- A radius of 12.44 Earth radii
- A mass of 734.18 Earth masses
- Surface gravity around 4.74 g
- An orbital period of 4.281 days
- Semi-major axis 0.0555 AU
- Equilibrium temperature 1,472 K (1199 °C)
- Distance from Earth 1,072.41 light-years
- Earth Similarity Index 0.106
- Travel time at Voyager 1 speed 18,911,904 years
TOI-4791 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1293of 1771
top 73.0%
This planet
12.44R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-4791 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.44 | 11.21 |
| Mass (M⊕) | 1.00 | 734.18 | 317.83 |
| Density (g/cm³) | 5.51 | 2.09 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.74 | 2.53 |
| Insolation (S⊕) | 1.00 | 783.20 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 734.184 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 100389539
Gaia DR2
Gaia DR2 2930141657016297216
Gaia DR3
Gaia DR3 2930141657016297216
System
TOI-4791
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.28 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0555 AU.
Transit Fingerprint
Depth
0.655 %
Duration
3.334 h
Impact parameter b
0.657
Transit midpoint (BJD)
2,459,237.5951
Photometric dip
Transit produces a flux drop of 6,550 ppm lasting ≈ 3.33 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
8.460
Impact parameter (b)
0.657
RV semi-amplitude (K)
250.000 m/s
Transit mid-time (BJD)
2,459,237.5951
Angular separation (arcsec)
0.16900
Eq. Temperature
1,472K
(1199 °C)
Insolation (S⊕)
783.20
Earth = 1.00
Earth Similarity (ESI)
0.106
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-4791
Spectral Class
F-type yellow-white
Effective Temperature
6,058 K — hotter than the Sun (5,778 K)
Estimated Age
3.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.409 R☉
Stellar Mass
1.242 M☉
Metallicity [Fe/H]
0.21
Extended Stellar Properties
Surface gravity (log g)
4.234 dex
Stellar density
0.624 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.013 mas
Total Proper Motion
15.549 mas/yr
PM Right Ascension
-14.28 mas/yr
PM Declination
6.14 mas/yr
Galactic Cartesian (pc)
x = -0.312 · y = 0.887 · z = -0.339
Equatorial (J2000)
RA 109.38838° · Dec -19.82894°
Galactic ℓ, b
233.498° · -3.410°
Ecliptic λ, β
114.688° · -41.621°
HTM-20 index
463948770
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