Key parameters at a glance
- A radius of 1.50 Earth radii
- A mass of 3.49 Earth masses
- Surface gravity around 1.54 g
- An orbital period of 1.053 days
- Semi-major axis 0.0171 AU
- Equilibrium temperature 1,478 K (1205 °C)
- Distance from Earth 266.32 light-years
- Earth Similarity Index 0.194
- Travel time at Voyager 1 speed 4,696,548 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-2345
TOI-2345 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-2345 b this | Super-Earth | 1.50 | 3.49 | 1.053 | 1,478 | 2025 |
| TOI-2345 c | Sub-Neptune | 2.45 | 7.27 | 21.064 | 544 | 2025 |
TOI-2345 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#745of 1176
top 63.3%
This planet
1.50R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-2345 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.50 | 11.21 |
| Mass (M⊕) | 1.00 | 3.49 | 317.83 |
| Density (g/cm³) | 5.51 | 5.64 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.54 | 2.53 |
| Insolation (S⊕) | 1.00 | 791.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3.490 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 91555165
Gaia DR2
Gaia DR2 5049575943053753088
Gaia DR3
Gaia DR3 5049575943053753088
System
TOI-2345
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.05 Earth days (0.3% of a terrestrial year) at a mean orbital distance of 0.0170 AU.
Transit Fingerprint
Depth
0.036 %
Duration
1.529 h
Impact parameter b
0.270
Rp / R★
0.018910
Transit midpoint (BJD)
2,459,116.7208
Photometric dip
Transit produces a flux drop of 359 ppm lasting ≈ 1.53 h.
Extended Orbital Architecture
Planet / star radius ratio
0.018910
Semi-major axis / stellar radius
5.030
Impact parameter (b)
0.270
RV semi-amplitude (K)
2.710 m/s
Transit mid-time (BJD)
2,459,116.7208
Angular separation (arcsec)
0.20900
Eq. Temperature
1,478K
(1205 °C)
Insolation (S⊕)
791.00
Earth = 1.00
Earth Similarity (ESI)
0.194
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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
Eschen et al. 2025Instrument
TESS CCD Array
Publication
2025-10
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2345
Spectral Class
K-type orange
Effective Temperature
4,687 K — cooler than the Sun (5,778 K)
Estimated Age
6.30 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.729 R☉
Stellar Mass
0.727 M☉
Metallicity [Fe/H]
-0.10
Extended Stellar Properties
Surface gravity (log g)
4.570 dex
Stellar density
2.650 g/cm³
Systemic radial velocity
58.14 km/s
Rotational v·sin i
2.30 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
12.218 mas
Total Proper Motion
227.719 mas/yr
PM Right Ascension
202.40 mas/yr
PM Declination
-104.35 mas/yr
Galactic Cartesian (pc)
x = 0.591 · y = 0.568 · z = -0.573
Equatorial (J2000)
RA 43.88479° · Dec -34.97797°
Galactic ℓ, b
237.158° · -62.413°
Ecliptic λ, β
26.392° · -48.755°
HTM-20 index
-392653523
Similar Worlds
Kepler-1968 b
Super-Earth · K-type orange
Radius 1.50 R⊕ · 2,449.2 ly
K2-268 b
Super-Earth · K-type orange
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Kepler-828 b
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Radius 1.51 R⊕ · 1,876.4 ly
Kepler-1324 b
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K2-141 b
Super-Earth · K-type orange
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HD 219134 c
Super-Earth · K-type orange
Radius 1.51 R⊕ · 21.3 ly