Key parameters at a glance
- A radius of 2.10 Earth radii
- A mass of 5.08 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 4.178 days
- Semi-major axis 0.0355 AU
- Equilibrium temperature 541 K (268 °C)
- Distance from Earth 121.76 light-years
- Earth Similarity Index 0.493
- 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 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-1224 b this | Sub-Neptune | 2.10 | 5.08 | 4.178 | 541 | 2024 |
| TOI-1224 c | Sub-Neptune | 2.88 | 8.67 | 17.945 | 303 | 2024 |
TOI-1224 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1816of 1978
top 91.8%
This planet
2.10R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1224 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.10 | 11.21 |
| Mass (M⊕) | 1.00 | 5.08 | 317.83 |
| Density (g/cm³) | 5.51 | 3.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 13.93 | 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 4.18 Earth days (1.1% of a terrestrial year) at a mean orbital distance of 0.0355 AU.
Transit Fingerprint
Depth
0.228 %
Duration
1.676 h
Impact parameter b
0.270
Rp / R★
0.047800
Transit midpoint (BJD)
2,458,327.7024
Photometric dip
Transit produces a flux drop of 2,280 ppm lasting ≈ 1.68 h.
Extended Orbital Architecture
Planet / star radius ratio
0.047800
Semi-major axis / stellar radius
18.900
Impact parameter (b)
0.270
Transit mid-time (BJD)
2,458,327.7024
Angular separation (arcsec)
0.95100
Eq. Temperature
541K
(268 °C)
Insolation (S⊕)
13.93
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.
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
Similar Worlds
Kepler-52 b
Sub-Neptune · M-type red dwarf
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K2-286 b
Sub-Neptune · M-type red dwarf
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Kepler-54 b
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Kepler-155 b
Sub-Neptune · M-type red dwarf
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Kepler-296 d
Sub-Neptune · M-type red dwarf
Radius 2.09 R⊕ · 544.7 ly
TOI-1749 c
Sub-Neptune · M-type red dwarf
Radius 2.12 R⊕ · 324.7 ly