Key parameters at a glance
- A radius of 25.00 Earth radii
- A mass of 593.00 Earth masses
- Surface gravity around 0.95 g
- An orbital period of 4.426 days
- Semi-major axis 0.0578 AU
- Equilibrium temperature 1,293 K (1020 °C)
- Distance from Earth 454.94 light-years
- Earth Similarity Index 0.067
- Travel time at Voyager 1 speed 8,022,786 years
1 sibling around TOI-1408
TOI-1408 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| TOI-1408 c | Sub-Neptune | 2.22 | 7.60 | 2.166 | 1,864 | 2024 |
| TOI-1408 b this | Gas Giant | 25.00 | 593.00 | 4.426 | 1,293 | 2023 |
TOI-1408 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#6of 1771
top 0.3%
This planet
25.00R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-1408 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 25.00 | 11.21 |
| Mass (M⊕) | 1.00 | 593.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.18 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.95 | 2.53 |
| Insolation (S⊕) | 1.00 | 465.18 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 593.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 364186197
Gaia DR2
Gaia DR2 2275130045974715904
Gaia DR3
Gaia DR3 2275130045974715904
System
TOI-1408
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.43 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0578 AU.
Transit Fingerprint
Depth
0.245 %
Duration
1.650 h
Rp / R★
0.150000
Transit midpoint (BJD)
2,458,740.8581
Photometric dip
Transit produces a flux drop of 2,447 ppm lasting ≈ 1.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.150000
Semi-major axis / stellar radius
8.130
RV semi-amplitude (K)
178.000 m/s
Transit mid-time (BJD)
2,458,740.8581
Long. of periastron (ω)
170.00°
Angular separation (arcsec)
0.41400
Eq. Temperature
1,293K
(1020 °C)
Insolation (S⊕)
465.18
Earth = 1.00
Earth Similarity (ESI)
0.067
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Galazutdinov 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-1408
Spectral Class
F-type yellow-white
Effective Temperature
6,117 K — hotter than the Sun (5,778 K)
Estimated Age
2.70 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.530 R☉
Stellar Mass
1.312 M☉
Metallicity [Fe/H]
0.25
Extended Stellar Properties
Surface gravity (log g)
4.100 dex
Stellar density
0.520 g/cm³
Rotational v·sin i
9.80 km/s
Rotation period
7.91 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
7.140 mas
Total Proper Motion
31.089 mas/yr
PM Right Ascension
11.81 mas/yr
PM Declination
28.76 mas/yr
Galactic Cartesian (pc)
x = 0.206 · y = -0.217 · z = 0.954
Equatorial (J2000)
RA 313.51105° · Dec 72.58065°
Galactic ℓ, b
107.273° · 17.412°
Ecliptic λ, β
41.181° · 74.105°
HTM-20 index
127581591
Similar Worlds
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Gas Giant · F-type yellow-white
Radius 23.99 R⊕ · 1,212.3 ly
XO-6 b
Gas Giant · F-type yellow-white
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HAT-P-41 b
Gas Giant · F-type yellow-white
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Kepler-435 b
Gas Giant · F-type yellow-white
Radius 22.31 R⊕ · 4,627.4 ly
HAT-P-32 b
Gas Giant · F-type yellow-white
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WASP-12 b
Gas Giant · F-type yellow-white
Radius 22.03 R⊕ · 1,393.5 ly