Key parameters at a glance
- A radius of 14.20 Earth radii
- A mass of 254.26 Earth masses
- Surface gravity around 1.26 g
- An orbital period of 5.715 days
- Semi-major axis 0.0660 AU
- Equilibrium temperature 1,358 K (1085 °C)
- Distance from Earth 900.53 light-years
- Earth Similarity Index 0.090
- Travel time at Voyager 1 speed 15,880,899 years
TOI-2031 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#332of 1771
top 18.7%
This planet
14.20R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-2031 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.20 | 11.21 |
| Mass (M⊕) | 1.00 | 254.26 | 317.83 |
| Density (g/cm³) | 5.51 | 0.49 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.26 | 2.53 |
| Insolation (S⊕) | 1.00 | 567.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 254.263 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 470127886
Gaia DR2
Gaia DR2 2299101254886404608
Gaia DR3
Gaia DR3 2299101254886404608
System
TOI-2031
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.72 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0660 AU.
Transit Fingerprint
Depth
1.101 %
Duration
4.027 h
Impact parameter b
0.336
Transit midpoint (BJD)
2,459,806.0291
Photometric dip
Transit produces a flux drop of 11,010 ppm lasting ≈ 4.03 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
11.430
Impact parameter (b)
0.336
RV semi-amplitude (K)
81.000 m/s
Transit mid-time (BJD)
2,459,806.0291
Angular separation (arcsec)
0.23900
Eq. Temperature
1,358K
(1085 °C)
Insolation (S⊕)
567.00
Earth = 1.00
Earth Similarity (ESI)
0.090
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. 2025Instrument
TESS CCD Array
Publication
2025-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2031 A
Spectral Class
F-type yellow-white
Effective Temperature
6,490 K — hotter than the Sun (5,778 K)
Estimated Age
2.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.241 R☉
Stellar Mass
1.174 M☉
Metallicity [Fe/H]
-0.24
Extended Stellar Properties
Surface gravity (log g)
4.320 dex
Stellar density
0.865 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.593 mas
Total Proper Motion
25.841 mas/yr
PM Right Ascension
25.72 mas/yr
PM Declination
2.51 mas/yr
Galactic Cartesian (pc)
x = 0.128 · y = -0.071 · z = 0.989
Equatorial (J2000)
RA 331.11781° · Dec 81.56595°
Galactic ℓ, b
116.940° · 20.711°
Ecliptic λ, β
68.642° · 69.348°
HTM-20 index
1688351167
Similar Worlds
NGTS-23 b
Gas Giant · F-type yellow-white
Radius 14.20 R⊕ · 3,506.0 ly
HD 212301 b
Gas Giant · F-type yellow-white
Radius 14.20 R⊕ · 176.9 ly
BEBOP-3 b
Gas Giant · F-type yellow-white
Radius 14.20 R⊕ · 388.3 ly
DMPP-2 b
Gas Giant · F-type yellow-white
Radius 14.20 R⊕ · 449.9 ly
Pr0201 b
Gas Giant · F-type yellow-white
Radius 14.20 R⊕ · 589.2 ly
WASP-75 b
Gas Giant · F-type yellow-white
Radius 14.24 R⊕ · 958.9 ly