Key parameters at a glance
- A radius of 2.61 Earth radii
- A mass of 15.20 Earth masses
- Surface gravity around 2.23 g
- An orbital period of 16.538 days
- Semi-major axis 0.1270 AU
- Equilibrium temperature 723 K (450 °C)
- Distance from Earth 299.86 light-years
- Earth Similarity Index 0.373
- Travel time at Voyager 1 speed 5,287,950 years
TOI-1451 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#998of 1978
top 50.4%
This planet
2.61R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1451 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.61 | 11.21 |
| Mass (M⊕) | 1.00 | 15.20 | 317.83 |
| Density (g/cm³) | 5.51 | 4.67 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.23 | 2.53 |
| Insolation (S⊕) | 1.00 | 53.02 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 15.200 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 417931607
Gaia DR2
Gaia DR2 1581799694493008384
Gaia DR3
Gaia DR3 1581799694493008384
System
TOI-1451
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 16.54 Earth days (4.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1270 AU.
Transit Fingerprint
Depth
0.061 %
Duration
3.094 h
Impact parameter b
0.507
Rp / R★
0.023561
Transit midpoint (BJD)
2,458,694.3115
Photometric dip
Transit produces a flux drop of 608 ppm lasting ≈ 3.09 h.
Extended Orbital Architecture
Planet / star radius ratio
0.023561
Impact parameter (b)
0.507
RV semi-amplitude (K)
3.820 m/s
Transit mid-time (BJD)
2,458,694.3115
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
1.38000
Eq. Temperature
723K
(450 °C)
Insolation (S⊕)
53.02
Earth = 1.00
Earth Similarity (ESI)
0.373
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-1451
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,801 K — hotter than the Sun (5,778 K)
Estimated Age
4.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.016 R☉
Stellar Mass
1.002 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.424 dex
Stellar density
1.336 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
10.848 mas
Total Proper Motion
27.471 mas/yr
PM Right Ascension
-5.72 mas/yr
PM Declination
-26.87 mas/yr
Galactic Cartesian (pc)
x = -0.478 · y = -0.055 · z = 0.877
Equatorial (J2000)
RA 186.52428° · Dec 61.25893°
Galactic ℓ, b
128.321° · 55.603°
Ecliptic λ, β
147.986° · 55.709°
HTM-20 index
540529046
Similar Worlds
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Sub-Neptune · G-type yellow (Sun-like)
Radius 2.61 R⊕ · 2,251.6 ly
Kepler-1147 b
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Kepler-704 b
Sub-Neptune · G-type yellow (Sun-like)
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Kepler-344 b
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TOI-1422 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.61 R⊕ · 506.0 ly
Kepler-284 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.61 R⊕ · 3,365.8 ly