Key parameters at a glance
- A radius of 2.22 Earth radii
- A mass of 7.60 Earth masses
- Surface gravity around 1.54 g
- An orbital period of 2.166 days
- Semi-major axis 0.0359 AU
- Equilibrium temperature 1,864 K (1591 °C)
- Distance from Earth 454.94 light-years
- Earth Similarity Index 0.132
- Travel time at Voyager 1 speed 8,022,786 years
1 sibling around TOI-1408
TOI-1408 c 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 this | Sub-Neptune | 2.22 | 7.60 | 2.166 | 1,864 | 2024 |
| TOI-1408 b | Gas Giant | 25.00 | 593.00 | 4.426 | 1,293 | 2023 |
TOI-1408 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1642of 1978
top 83.0%
This planet
2.22R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1408 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.22 | 11.21 |
| Mass (M⊕) | 1.00 | 7.60 | 317.83 |
| Density (g/cm³) | 5.51 | 3.80 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.54 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,005.35 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 7.600 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 Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.17 Earth days (0.6% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0359 AU.
Transit Fingerprint
Depth
0.009 %
Duration
2.670 h
Rp / R★
0.013400
Transit midpoint (BJD)
2,458,739.8470
Photometric dip
Transit produces a flux drop of 87 ppm lasting ≈ 2.67 h.
Extended Orbital Architecture
Planet / star radius ratio
0.013400
Semi-major axis / stellar radius
5.040
Transit mid-time (BJD)
2,458,739.8470
Long. of periastron (ω)
286.30°
Angular separation (arcsec)
0.25700
Eq. Temperature
1,864K
(1591 °C)
Insolation (S⊕)
2,005.35
Earth = 1.00
Earth Similarity (ESI)
0.132
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Korth et al. 2024Instrument
TESS CCD Array
Publication
2024-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 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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Sub-Neptune · F-type yellow-white
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Kepler-1609 b
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Kepler-1432 b
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Kepler-1949 b
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TOI-128.01
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K2-335 b
Sub-Neptune · F-type yellow-white
Radius 2.21 R⊕ · 1,819.9 ly