Key parameters at a glance
- A radius of 12.27 Earth radii
- A mass of 55.62 Earth masses
- Surface gravity around 0.37 g
- An orbital period of 6.608 days
- Semi-major axis 0.0743 AU
- Equilibrium temperature 1,295 K (1022 °C)
- Distance from Earth 1,683.25 light-years
- Earth Similarity Index 0.081
- Travel time at Voyager 1 speed 29,684,089 years
TOI-3976 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1393of 1771
top 78.6%
This planet
12.27R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-3976 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.27 | 11.21 |
| Mass (M⊕) | 1.00 | 55.62 | 317.83 |
| Density (g/cm³) | 5.51 | 0.17 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.37 | 2.53 |
| Insolation (S⊕) | 1.00 | 469.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 55.620 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 154293917
Gaia DR2
Gaia DR2 1585783740516554624
Gaia DR3
Gaia DR3 1585783740516554624
System
TOI-3976
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.61 Earth days (1.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0743 AU.
Transit Fingerprint
Depth
0.562 %
Duration
4.517 h
Impact parameter b
0.505
Transit midpoint (BJD)
2,459,011.1579
Photometric dip
Transit produces a flux drop of 5,620 ppm lasting ≈ 4.52 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
10.630
Impact parameter (b)
0.505
RV semi-amplitude (K)
16.300 m/s
Transit mid-time (BJD)
2,459,011.1579
Angular separation (arcsec)
0.14400
Eq. Temperature
1,295K
(1022 °C)
Insolation (S⊕)
469.00
Earth = 1.00
Earth Similarity (ESI)
0.081
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Yee et al. 2023Instrument
TESS CCD Array
Publication
2023-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-3976 A
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,975 K — hotter than the Sun (5,778 K)
Estimated Age
3.80 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.501 R☉
Stellar Mass
1.254 M☉
Metallicity [Fe/H]
0.18
Extended Stellar Properties
Surface gravity (log g)
4.183 dex
Stellar density
0.521 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.909 mas
Total Proper Motion
22.230 mas/yr
PM Right Ascension
-19.91 mas/yr
PM Declination
9.88 mas/yr
Galactic Cartesian (pc)
x = -0.512 · y = -0.501 · z = 0.698
Equatorial (J2000)
RA 224.35601° · Dec 44.27432°
Galactic ℓ, b
75.443° · 59.505°
Ecliptic λ, β
199.525° · 57.098°
HTM-20 index
-676818704
Similar Worlds
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HD 39091 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.30 R⊕ · 59.6 ly