Key parameters at a glance
- A radius of 2.88 Earth radii
- A mass of 8.67 Earth masses
- Surface gravity around 1.04 g
- An orbital period of 17.945 days
- Equilibrium temperature 303 K (30 °C)
- Distance from Earth 121.76 light-years
- Earth Similarity Index 0.701
- Travel time at Voyager 1 speed 2,147,201 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-1224
TOI-1224 c 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-1224 b | Sub-Neptune | 2.10 | 5.08 | 4.178 | 541 | 2024 |
| TOI-1224 c this | Sub-Neptune | 2.88 | 8.67 | 17.945 | 303 | 2024 |
TOI-1224 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#649of 1978
top 32.8%
This planet
2.88R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1224 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.88 | 11.21 |
| Mass (M⊕) | 1.00 | 8.67 | 317.83 |
| Density (g/cm³) | 5.51 | 1.99 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.04 | 2.53 |
| Insolation (S⊕) | 1.00 | 2.00 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 299798795
Gaia DR2
Gaia DR2 4620009665047355520
Gaia DR3
Gaia DR3 4620009665047355520
System
TOI-1224
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.95 Earth days (4.9% of a terrestrial year) on a nearly circular orbit.
Transit Fingerprint
Depth
0.548 %
Duration
3.074 h
Impact parameter b
0.487
Rp / R★
0.065000
Transit midpoint (BJD)
2,458,329.8597
Photometric dip
Transit produces a flux drop of 5,481 ppm lasting ≈ 3.07 h.
Extended Orbital Architecture
Planet / star radius ratio
0.065000
Impact parameter (b)
0.487
Transit mid-time (BJD)
2,458,329.8597
Long. of periastron (ω)
90.00°
Eq. Temperature
303K
(30 °C)
Insolation (S⊕)
2.00
Earth = 1.00
Earth Similarity (ESI)
0.701
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Thao et al. 2024Instrument
TESS CCD Array
Publication
2024-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1224
Spectral Class
M-type red dwarf
Effective Temperature
3,326 K — cooler than the Sun (5,778 K)
Estimated Age
0.21 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.404 R☉
Stellar Mass
0.400 M☉
Metallicity [Fe/H]
—
Extended Stellar Properties
Surface gravity (log g)
4.893 dex
Stellar density
6.852 g/cm³
Systemic radial velocity
14.63 km/s
Rotational v·sin i
22.10 km/s
Rotation period
1.23 days
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
26.758 mas
Total Proper Motion
162.156 mas/yr
PM Right Ascension
159.88 mas/yr
PM Declination
27.05 mas/yr
Galactic Cartesian (pc)
x = 0.126 · y = 0.096 · z = -0.987
Equatorial (J2000)
RA 37.19784° · Dec -80.89911°
Galactic ℓ, b
298.348° · -35.345°
Ecliptic λ, β
292.439° · -70.729°
HTM-20 index
2028117339
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