Key parameters at a glance
- A radius of 10.30 Earth radii
- A mass of 124.00 Earth masses
- Surface gravity around 1.17 g
- An orbital period of 2.948 days
- Semi-major axis 0.0338 AU
- Equilibrium temperature 742 K (469 °C)
- Distance from Earth 738.15 light-years
- Earth Similarity Index 0.196
- Travel time at Voyager 1 speed 13,017,270 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-5688 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1743of 1771
top 98.4%
This planet
10.30R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-5688 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.30 | 11.21 |
| Mass (M⊕) | 1.00 | 124.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.61 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.17 | 2.53 |
| Insolation (S⊕) | 1.00 | 50.30 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 124.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 193634953
Gaia DR2
Gaia DR2 1363205856494897024
Gaia DR3
Gaia DR3 1363205856494897024
System
TOI-5688
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.95 Earth days (0.8% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0338 AU.
Transit Fingerprint
Depth
2.409 %
Duration
1.680 h
Impact parameter b
0.714
Rp / R★
0.164000
Transit midpoint (BJD)
2,459,771.2602
Photometric dip
Transit produces a flux drop of 24,090 ppm lasting ≈ 1.68 h.
Extended Orbital Architecture
Planet / star radius ratio
0.164000
Semi-major axis / stellar radius
12.500
Impact parameter (b)
0.714
RV semi-amplitude (K)
79.400 m/s
Transit mid-time (BJD)
2,459,771.2602
Long. of periastron (ω)
-1.32°
Angular separation (arcsec)
0.14900
Eq. Temperature
742K
(469 °C)
Insolation (S⊕)
50.30
Earth = 1.00
Earth Similarity (ESI)
0.196
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. 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
Reji et al. 2024Instrument
TESS CCD Array
Publication
2024-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-5688 A
Spectral Class
K-type orange
Effective Temperature
3,713 K — cooler than the Sun (5,778 K)
Estimated Age
7.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.570 R☉
Stellar Mass
0.600 M☉
Metallicity [Fe/H]
0.47
Extended Stellar Properties
Surface gravity (log g)
4.690 dex
Stellar density
4.430 g/cm³
Systemic radial velocity
-83.30 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
4.390 mas
Total Proper Motion
65.118 mas/yr
PM Right Ascension
-0.80 mas/yr
PM Declination
65.11 mas/yr
Galactic Cartesian (pc)
x = -0.036 · y = -0.672 · z = 0.740
Equatorial (J2000)
RA 266.92310° · Dec 47.70505°
Galactic ℓ, b
74.510° · 30.115°
Ecliptic λ, β
263.601° · 71.076°
HTM-20 index
-709971846
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