Key parameters at a glance
- A radius of 11.68 Earth radii
- A mass of 4,096.81 Earth masses
- Surface gravity around 30.03 g
- An orbital period of 7.246 days
- Semi-major axis 0.0888 AU
- Equilibrium temperature 1,677 K (1404 °C)
- Distance from Earth 735.95 light-years
- Earth Similarity Index 0.080
- Travel time at Voyager 1 speed 12,978,445 years
TOI-4603 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1568of 1771
top 88.5%
This planet
11.68R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-4603 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.68 | 11.21 |
| Mass (M⊕) | 1.00 | 4,096.81 | 317.83 |
| Density (g/cm³) | 5.51 | 14.10 | 1.33 |
| Surface Gravity (g) | 1.00 | 30.03 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,192.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4,096.808 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 4,036.421 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 245134
TIC
TIC 437856897
Gaia DR2
Gaia DR2 3402980516507429888
Gaia DR3
Gaia DR3 3402980516507429888
System
TOI-4603
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.25 Earth days (2.0% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0888 AU.
Transit Fingerprint
Depth
0.153 %
Duration
2.854 h
Impact parameter b
0.952
Rp / R★
0.039100
Transit midpoint (BJD)
2,459,549.1260
Photometric dip
Transit produces a flux drop of 1,528 ppm lasting ≈ 2.85 h.
Extended Orbital Architecture
Planet / star radius ratio
0.039100
Semi-major axis / stellar radius
6.970
Impact parameter (b)
0.952
RV semi-amplitude (K)
962.000 m/s
Transit mid-time (BJD)
2,459,549.1260
Long. of periastron (ω)
20.40°
Angular separation (arcsec)
0.39400
Eq. Temperature
1,677K
(1404 °C)
Insolation (S⊕)
1,192.00
Earth = 1.00
Earth Similarity (ESI)
0.080
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
Khandelwal 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-4603
Spectral Class
F-type yellow-white
Effective Temperature
6,264 K — hotter than the Sun (5,778 K)
Estimated Age
1.64 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
2.738 R☉
Stellar Mass
1.765 M☉
Metallicity [Fe/H]
0.34
Extended Stellar Properties
Surface gravity (log g)
3.810 dex
Stellar density
0.121 g/cm³
Rotational v·sin i
23.18 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.404 mas
Total Proper Motion
23.036 mas/yr
PM Right Ascension
0.17 mas/yr
PM Declination
-23.04 mas/yr
Galactic Cartesian (pc)
x = 0.100 · y = 0.926 · z = 0.363
Equatorial (J2000)
RA 83.86593° · Dec 21.29424°
Galactic ℓ, b
185.286° · -5.986°
Ecliptic λ, β
84.279° · -2.023°
HTM-20 index
1499203101
Similar Worlds
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