Key parameters at a glance
- A radius of 3.19 Earth radii
- A mass of 16.14 Earth masses
- Surface gravity around 1.59 g
- An orbital period of 3.184 days
- Semi-major axis 0.0417 AU
- Equilibrium temperature 1,317 K (1044 °C)
- Distance from Earth 573.21 light-years
- Earth Similarity Index 0.177
- Travel time at Voyager 1 speed 10,108,604 years
TOI-908 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#364of 1978
top 18.4%
This planet
3.19R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-908 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.19 | 11.21 |
| Mass (M⊕) | 1.00 | 16.14 | 317.83 |
| Density (g/cm³) | 5.51 | 2.74 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.59 | 2.53 |
| Insolation (S⊕) | 1.00 | 80.88 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 16.137 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 350153977
Gaia DR2
Gaia DR2 4619238087059206784
Gaia DR3
Gaia DR3 4619238087059206784
System
TOI-908
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.18 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0417 AU.
Transit Fingerprint
Depth
0.085 %
Duration
2.457 h
Impact parameter b
0.536
Rp / R★
0.028000
Transit midpoint (BJD)
2,459,384.2920
Photometric dip
Transit produces a flux drop of 850 ppm lasting ≈ 2.46 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028000
Impact parameter (b)
0.536
RV semi-amplitude (K)
7.244 m/s
Transit mid-time (BJD)
2,459,384.2920
Long. of periastron (ω)
35.86°
Angular separation (arcsec)
0.23700
Eq. Temperature
1,317K
(1044 °C)
Insolation (S⊕)
80.88
Earth = 1.00
Earth Similarity (ESI)
0.177
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
Hawthorn et al. 2023Instrument
TESS CCD Array
Publication
2023-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-908
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,626 K — cooler than the Sun (5,778 K)
Estimated Age
4.60 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.028 R☉
Stellar Mass
0.950 M☉
Metallicity [Fe/H]
0.08
Extended Stellar Properties
Surface gravity (log g)
4.450 dex
Stellar density
1.235 g/cm³
Rotational v·sin i
2.56 km/s
Rotation period
21.93 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.661 mas
Total Proper Motion
5.847 mas/yr
PM Right Ascension
5.84 mas/yr
PM Declination
-0.31 mas/yr
Galactic Cartesian (pc)
x = 0.091 · y = 0.122 · z = -0.988
Equatorial (J2000)
RA 53.15943° · Dec -81.25075°
Galactic ℓ, b
296.145° · -33.637°
Ecliptic λ, β
287.951° · -72.790°
HTM-20 index
-1974205409
Similar Worlds
Kepler-1294 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.19 R⊕ · 6,052.5 ly
HD 85426 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.19 R⊕ · 176.0 ly
Kepler-1634 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.19 R⊕ · 2,013.5 ly
Kepler-351 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.19 R⊕ · 3,535.2 ly
TOI-1736 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.18 R⊕ · 290.1 ly
Kepler-630 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.18 R⊕ · 2,739.0 ly