Key parameters at a glance
- A radius of 2.39 Earth radii
- A mass of 6.80 Earth masses
- Surface gravity around 1.19 g
- An orbital period of 5.748 days
- Semi-major axis 0.0560 AU
- Equilibrium temperature 715 K (442 °C)
- Distance from Earth 191.11 light-years
- Earth Similarity Index 0.361
- Travel time at Voyager 1 speed 3,370,221 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-1184 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1343of 1978
top 67.8%
This planet
2.39R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1184 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.39 | 11.21 |
| Mass (M⊕) | 1.00 | 6.80 | 317.83 |
| Density (g/cm³) | 5.51 | 2.63 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.19 | 2.53 |
| Insolation (S⊕) | 1.00 | 57.54 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 6.800 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 233087860
Gaia DR2
Gaia DR2 2158781336134901760
Gaia DR3
Gaia DR3 2158781336134901760
System
TOI-1184
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.75 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0560 AU.
Transit Fingerprint
Depth
0.104 %
Duration
1.888 h
Impact parameter b
0.691
Rp / R★
0.031800
Transit midpoint (BJD)
2,459,960.5115
Photometric dip
Transit produces a flux drop of 1,041 ppm lasting ≈ 1.89 h.
Extended Orbital Architecture
Planet / star radius ratio
0.031800
Impact parameter (b)
0.691
RV semi-amplitude (K)
3.000 m/s
Transit mid-time (BJD)
2,459,960.5115
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.95600
Eq. Temperature
715K
(442 °C)
Insolation (S⊕)
57.54
Earth = 1.00
Earth Similarity (ESI)
0.361
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.
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
Polanski et al. 2024Instrument
TESS CCD Array
Publication
2024-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1184
Spectral Class
K-type orange
Effective Temperature
4,534 K — cooler than the Sun (5,778 K)
Estimated Age
5.30 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.690 R☉
Stellar Mass
0.710 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.612 dex
Stellar density
3.003 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
17.038 mas
Total Proper Motion
152.568 mas/yr
PM Right Ascension
64.89 mas/yr
PM Declination
138.08 mas/yr
Galactic Cartesian (pc)
x = 0.019 · y = -0.489 · z = 0.872
Equatorial (J2000)
RA 272.20452° · Dec 60.67878°
Galactic ℓ, b
89.705° · 28.565°
Ecliptic λ, β
280.445° · 84.038°
HTM-20 index
-1086563958
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Kepler-1849 b
Sub-Neptune · K-type orange
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HIP 113103 c
Sub-Neptune · K-type orange
Radius 2.40 R⊕ · 150.7 ly