Key parameters at a glance
- A radius of 2.22 Earth radii
- A mass of 2.95 Earth masses
- Surface gravity around 0.60 g
- An orbital period of 6.589 days
- Equilibrium temperature 820 K (547 °C)
- Distance from Earth 256.82 light-years
- Earth Similarity Index 0.294
- Travel time at Voyager 1 speed 4,529,023 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-1453
TOI-1453 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-1453 b | Rocky Terrestrial | 1.17 | 2.32 | 4.314 | 944 | 2025 |
| TOI-1453 c this | Sub-Neptune | 2.22 | 2.95 | 6.589 | 820 | 2025 |
TOI-1453 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1639of 1978
top 82.8%
This planet
2.22R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1453 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.22 | 11.21 |
| Mass (M⊕) | 1.00 | 2.95 | 317.83 |
| Density (g/cm³) | 5.51 | 1.47 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.60 | 2.53 |
| Insolation (S⊕) | 1.00 | 75.30 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2.950 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 198390247
Gaia DR2
Gaia DR2 1433062331332673792
Gaia DR3
Gaia DR3 1433062331332673792
System
TOI-1453
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.59 Earth days (1.8% of a terrestrial year) on a nearly circular orbit.
Transit Fingerprint
Depth
0.085 %
Duration
1.874 h
Impact parameter b
0.767
Rp / R★
0.028320
Transit midpoint (BJD)
2,459,395.3813
Photometric dip
Transit produces a flux drop of 852 ppm lasting ≈ 1.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028320
Semi-major axis / stellar radius
18.410
Impact parameter (b)
0.767
RV semi-amplitude (K)
1.260 m/s
Transit mid-time (BJD)
2,459,395.3813
Long. of periastron (ω)
90.00°
Eq. Temperature
820K
(547 °C)
Insolation (S⊕)
75.30
Earth = 1.00
Earth Similarity (ESI)
0.294
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
Stalport et al. 2025Instrument
TESS CCD Array
Publication
2025-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1453
Spectral Class
K-type orange
Effective Temperature
4,975 K — cooler than the Sun (5,778 K)
Estimated Age
12.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.720 R☉
Stellar Mass
0.715 M☉
Metallicity [Fe/H]
-0.31
Extended Stellar Properties
Surface gravity (log g)
4.576 dex
Stellar density
2.721 g/cm³
Rotational v·sin i
2.00 km/s
Activity index (log R'HK)
-4.910
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
12.671 mas
Total Proper Motion
71.005 mas/yr
PM Right Ascension
-71.01 mas/yr
PM Declination
-0.02 mas/yr
Galactic Cartesian (pc)
x = -0.111 · y = -0.530 · z = 0.841
Equatorial (J2000)
RA 258.22327° · Dec 57.19778°
Galactic ℓ, b
85.576° · 35.751°
Ecliptic λ, β
234.003° · 79.156°
HTM-20 index
330081385
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