Key parameters at a glance
- A radius of 11.86 Earth radii
- A mass of 473.56 Earth masses
- Surface gravity around 3.37 g
- An orbital period of 9.956 days
- Semi-major axis 0.0994 AU
- Equilibrium temperature 1,655 K (1382 °C)
- Distance from Earth 704.45 light-years
- Earth Similarity Index 0.092
- Travel time at Voyager 1 speed 12,422,998 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-4551 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1554of 1771
top 87.7%
This planet
11.86R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-4551 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.86 | 11.21 |
| Mass (M⊕) | 1.00 | 473.56 | 317.83 |
| Density (g/cm³) | 5.51 | 1.74 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.37 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,247.74 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 473.564 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 204650483
Gaia DR2
Gaia DR2 3476605537386300032
Gaia DR3
Gaia DR3 3476605537386300032
System
TOI-4551
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.96 Earth days (2.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0994 AU.
Transit Fingerprint
Depth
0.102 %
Duration
10.474 h
Impact parameter b
0.310
Rp / R★
0.030800
Transit midpoint (BJD)
2,458,575.6597
Photometric dip
Transit produces a flux drop of 1,024 ppm lasting ≈ 10.47 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030800
Impact parameter (b)
0.310
RV semi-amplitude (K)
117.300 m/s
Transit mid-time (BJD)
2,458,575.6597
Long. of periastron (ω)
2.37°
Angular separation (arcsec)
0.46000
Eq. Temperature
1,655K
(1382 °C)
Insolation (S⊕)
1,247.74
Earth = 1.00
Earth Similarity (ESI)
0.092
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
Pereira et al. 2023Instrument
TESS CCD Array
Publication
2023-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-4551
Spectral Class
K-type orange
Effective Temperature
4,896 K — cooler than the Sun (5,778 K)
Estimated Age
4.92 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
3.550 R☉
Stellar Mass
1.310 M☉
Metallicity [Fe/H]
0.23
Extended Stellar Properties
Surface gravity (log g)
3.480 dex
Stellar density
0.028 g/cm³
Systemic radial velocity
41.29 km/s
Rotational v·sin i
2.84 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.602 mas
Total Proper Motion
37.624 mas/yr
PM Right Ascension
-34.00 mas/yr
PM Declination
-16.11 mas/yr
Galactic Cartesian (pc)
x = -0.897 · y = -0.078 · z = -0.436
Equatorial (J2000)
RA 184.97876° · Dec -25.82785°
Galactic ℓ, b
294.100° · 36.503°
Ecliptic λ, β
195.276° · -21.632°
HTM-20 index
1410731852
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