Key parameters at a glance
- A radius of 2.43 Earth radii
- A mass of 6.46 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 10.877 days
- Semi-major axis 0.0560 AU
- Equilibrium temperature 429 K (156 °C)
- Distance from Earth 150.32 light-years
- Earth Similarity Index 0.572
- Travel time at Voyager 1 speed 2,650,935 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-904
TOI-904 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-904 b this | Sub-Neptune | 2.43 | 6.46 | 10.877 | 429 | 2023 |
| TOI-904 c | Sub-Neptune | 2.17 | 5.34 | 84.000 | 217 | 2023 |
TOI-904 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1295of 1978
top 65.4%
This planet
2.43R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-904 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.43 | 11.21 |
| Mass (M⊕) | 1.00 | 6.46 | 317.83 |
| Density (g/cm³) | 5.51 | 2.49 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | 8.32 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 261257684
Gaia DR2
Gaia DR2 4620844400530949376
Gaia DR3
Gaia DR3 4620844400530949376
System
TOI-904
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.88 Earth days (3.0% of a terrestrial year) at a mean orbital distance of 0.0560 AU.
Transit Fingerprint
Depth
0.183 %
Duration
3.650 h
Impact parameter b
0.714
Rp / R★
0.039000
Transit midpoint (BJD)
2,459,366.6210
Photometric dip
Transit produces a flux drop of 1,827 ppm lasting ≈ 3.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.039000
Semi-major axis / stellar radius
23.000
Impact parameter (b)
0.714
Transit mid-time (BJD)
2,459,366.6210
Angular separation (arcsec)
1.22000
Eq. Temperature
429K
(156 °C)
Insolation (S⊕)
8.32
Earth = 1.00
Earth Similarity (ESI)
0.572
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Harris et al. 2023Instrument
TESS CCD Array
Publication
2023-12
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-904
Spectral Class
K-type orange
Effective Temperature
3,770 K — cooler than the Sun (5,778 K)
Estimated Age
1.50 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.527 R☉
Stellar Mass
0.557 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.619 dex
Stellar density
5.360 g/cm³
Rotational v·sin i
2.00 km/s
Rotation period
17.10 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
21.668 mas
Total Proper Motion
114.573 mas/yr
PM Right Ascension
-28.94 mas/yr
PM Declination
110.86 mas/yr
Galactic Cartesian (pc)
x = 0.001 · y = 0.120 · z = -0.993
Equatorial (J2000)
RA 89.37127° · Dec -83.12973°
Galactic ℓ, b
295.324° · -28.525°
Ecliptic λ, β
270.260° · -73.430°
HTM-20 index
-2077204208
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