Key parameters at a glance
- A radius of 13.08 Earth radii
- A mass of 311.47 Earth masses
- Surface gravity around 1.82 g
- An orbital period of 3.246 days
- Semi-major axis 0.0456 AU
- Equilibrium temperature 1,534 K (1261 °C)
- Distance from Earth 1,292.81 light-years
- Earth Similarity Index 0.086
- Travel time at Voyager 1 speed 22,798,714 years
TOI-3688 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#951of 1771
top 53.6%
This planet
13.08R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-3688 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.08 | 11.21 |
| Mass (M⊕) | 1.00 | 311.47 | 317.83 |
| Density (g/cm³) | 5.51 | 0.76 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.82 | 2.53 |
| Insolation (S⊕) | 1.00 | 924.30 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 311.472 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 245509452
Gaia DR2
Gaia DR2 454187981188647168
Gaia DR3
Gaia DR3 454187981188647168
System
TOI-3688
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.25 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0456 AU.
Transit Fingerprint
Depth
0.850 %
Duration
3.482 h
Impact parameter b
0.270
Transit midpoint (BJD)
2,459,108.0507
Photometric dip
Transit produces a flux drop of 8,500 ppm lasting ≈ 3.48 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
7.530
Impact parameter (b)
0.270
RV semi-amplitude (K)
119.000 m/s
Transit mid-time (BJD)
2,459,108.0507
Angular separation (arcsec)
0.11500
Eq. Temperature
1,534K
(1261 °C)
Insolation (S⊕)
924.30
Earth = 1.00
Earth Similarity (ESI)
0.086
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-3688 A
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,950 K — hotter than the Sun (5,778 K)
Estimated Age
3.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.302 R☉
Stellar Mass
1.199 M☉
Metallicity [Fe/H]
0.26
Extended Stellar Properties
Surface gravity (log g)
4.288 dex
Stellar density
0.767 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.495 mas
Total Proper Motion
22.009 mas/yr
PM Right Ascension
18.84 mas/yr
PM Declination
-11.37 mas/yr
Galactic Cartesian (pc)
x = 0.446 · y = 0.365 · z = 0.818
Equatorial (J2000)
RA 39.28234° · Dec 54.85122°
Galactic ℓ, b
137.832° · -4.934°
Ecliptic λ, β
55.957° · 37.243°
HTM-20 index
602766529
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