Key parameters at a glance
- A radius of 3.07 Earth radii
- A mass of 10.00 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 9.687 days
- Semi-major axis 0.0808 AU
- Equilibrium temperature 638 K (365 °C)
- Distance from Earth 234.91 light-years
- Earth Similarity Index 0.368
- Travel time at Voyager 1 speed 4,142,637 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-1180 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#455of 1978
top 23.0%
This planet
3.07R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1180 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.07 | 11.21 |
| Mass (M⊕) | 1.00 | 10.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.93 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 36.97 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 10.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 158002130
Gaia DR2
Gaia DR2 1722026764638625280
Gaia DR3
Gaia DR3 1722026764638625280
System
TOI-1180
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.69 Earth days (2.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0808 AU.
Transit Fingerprint
Depth
0.167 %
Duration
2.749 h
Impact parameter b
0.495
Rp / R★
0.038500
Transit midpoint (BJD)
2,459,950.3274
Photometric dip
Transit produces a flux drop of 1,669 ppm lasting ≈ 2.75 h.
Extended Orbital Architecture
Planet / star radius ratio
0.038500
Impact parameter (b)
0.495
RV semi-amplitude (K)
3.600 m/s
Transit mid-time (BJD)
2,459,950.3274
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
1.12000
Eq. Temperature
638K
(365 °C)
Insolation (S⊕)
36.97
Earth = 1.00
Earth Similarity (ESI)
0.368
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-1180
Spectral Class
K-type orange
Effective Temperature
4,738 K — cooler than the Sun (5,778 K)
Estimated Age
5.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.730 R☉
Stellar Mass
0.750 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.587 dex
Stellar density
2.661 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
13.855 mas
Total Proper Motion
106.473 mas/yr
PM Right Ascension
84.41 mas/yr
PM Declination
-64.90 mas/yr
Galactic Cartesian (pc)
x = -0.112 · y = -0.077 · z = 0.991
Equatorial (J2000)
RA 214.55577° · Dec 82.19376°
Galactic ℓ, b
119.446° · 34.338°
Ecliptic λ, β
109.076° · 69.989°
HTM-20 index
1251246461
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