Key parameters at a glance
- A radius of 15.11 Earth radii
- A mass of 304.16 Earth masses
- Surface gravity around 1.33 g
- An orbital period of 4.378 days
- Semi-major axis 0.0579 AU
- Equilibrium temperature 1,162 K (889 °C)
- Distance from Earth 1,486.68 light-years
- Earth Similarity Index 0.122
- Travel time at Voyager 1 speed 26,217,676 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-4377 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#226of 1771
top 12.7%
This planet
15.11R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-4377 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.11 | 11.21 |
| Mass (M⊕) | 1.00 | 304.16 | 317.83 |
| Density (g/cm³) | 5.51 | 0.88 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.33 | 2.53 |
| Insolation (S⊕) | 1.00 | 430.98 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 304.162 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 394918211
Gaia DR2
Gaia DR2 5197568146570178176
Gaia DR3
Gaia DR3 5197568146570178176
System
TOI-4377
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.38 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0579 AU.
Transit Fingerprint
Depth
0.160 %
Duration
8.420 h
Impact parameter b
0.605
Rp / R★
0.039200
Transit midpoint (BJD)
2,458,602.1245
Photometric dip
Transit produces a flux drop of 1,604 ppm lasting ≈ 8.42 h.
Extended Orbital Architecture
Planet / star radius ratio
0.039200
Impact parameter (b)
0.605
RV semi-amplitude (K)
96.200 m/s
Transit mid-time (BJD)
2,458,602.1245
Long. of periastron (ω)
-0.73°
Angular separation (arcsec)
0.12700
Eq. Temperature
1,162K
(889 °C)
Insolation (S⊕)
430.98
Earth = 1.00
Earth Similarity (ESI)
0.122
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-4377
Spectral Class
K-type orange
Effective Temperature
4,974 K — cooler than the Sun (5,778 K)
Estimated Age
3.88 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
3.520 R☉
Stellar Mass
1.360 M☉
Metallicity [Fe/H]
0.21
Extended Stellar Properties
Surface gravity (log g)
3.390 dex
Stellar density
0.031 g/cm³
Systemic radial velocity
12.55 km/s
Rotational v·sin i
1.26 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.165 mas
Total Proper Motion
20.693 mas/yr
PM Right Ascension
-16.23 mas/yr
PM Declination
12.84 mas/yr
Galactic Cartesian (pc)
x = -0.131 · y = 0.035 · z = -0.991
Equatorial (J2000)
RA 164.93247° · Dec -82.22135°
Galactic ℓ, b
299.059° · -20.204°
Ecliptic λ, β
250.137° · -67.374°
HTM-20 index
-27769747
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