Key parameters at a glance
- A radius of 2.74 Earth radii
- A mass of 16.00 Earth masses
- Surface gravity around 2.13 g
- An orbital period of 22.809 days
- Semi-major axis 0.1510 AU
- Equilibrium temperature 529 K (256 °C)
- Distance from Earth 193.84 light-years
- Earth Similarity Index 0.493
- Travel time at Voyager 1 speed 3,418,352 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-1824 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#814of 1978
top 41.1%
This planet
2.74R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1824 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.74 | 11.21 |
| Mass (M⊕) | 1.00 | 16.00 | 317.83 |
| Density (g/cm³) | 5.51 | 4.24 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 14.63 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 16.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 142387023
Gaia DR2
Gaia DR2 1675511792082576384
Gaia DR3
Gaia DR3 1675511792082576384
System
TOI-1824
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 22.81 Earth days (6.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1510 AU.
Transit Fingerprint
Depth
0.098 %
Duration
4.110 h
Impact parameter b
0.377
Rp / R★
0.030968
Transit midpoint (BJD)
2,458,879.5467
Photometric dip
Transit produces a flux drop of 977 ppm lasting ≈ 4.11 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030968
Impact parameter (b)
0.377
RV semi-amplitude (K)
3.930 m/s
Transit mid-time (BJD)
2,458,879.5467
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
2.54000
Eq. Temperature
529K
(256 °C)
Insolation (S⊕)
14.63
Earth = 1.00
Earth Similarity (ESI)
0.493
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-1824
Spectral Class
K-type orange
Effective Temperature
5,165 K — cooler than the Sun (5,778 K)
Estimated Age
2.50 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.812 R☉
Stellar Mass
0.880 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.562 dex
Stellar density
2.303 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
16.797 mas
Total Proper Motion
16.982 mas/yr
PM Right Ascension
4.55 mas/yr
PM Declination
16.36 mas/yr
Galactic Cartesian (pc)
x = -0.451 · y = -0.144 · z = 0.881
Equatorial (J2000)
RA 197.73123° · Dec 61.74485°
Galactic ℓ, b
118.889° · 55.230°
Ecliptic λ, β
154.183° · 59.941°
HTM-20 index
-1656019628
Similar Worlds
Kepler-80 c
Sub-Neptune · K-type orange
Radius 2.74 R⊕ · 1,205.0 ly
Kepler-304 d
Sub-Neptune · K-type orange
Radius 2.75 R⊕ · 1,417.7 ly
TOI-1438 c
Sub-Neptune · K-type orange
Radius 2.75 R⊕ · 360.4 ly
HIP 97166 c
Sub-Neptune · K-type orange
Radius 2.75 R⊕ · 215.1 ly
K2-266 e
Sub-Neptune · K-type orange
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Kepler-436 b
Sub-Neptune · K-type orange
Radius 2.73 R⊕ · 1,920.6 ly