Key parameters at a glance
- A radius of 1.49 Earth radii
- A mass of 2.83 Earth masses
- Surface gravity around 1.27 g
- An orbital period of 4.849 days
- Semi-major axis 0.0520 AU
- Equilibrium temperature 867 K (594 °C)
- Distance from Earth 106.22 light-years
- Earth Similarity Index 0.348
- Travel time at Voyager 1 speed 1,873,268 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around TOI-431
TOI-431 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
TOI-431 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#766of 1176
top 65.1%
This planet
1.49R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-431 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.49 | 11.21 |
| Mass (M⊕) | 1.00 | 2.83 | 317.83 |
| Density (g/cm³) | 5.51 | 4.70 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.27 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 2.830 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 26013
TIC
TIC 31374837
Gaia DR2
Gaia DR2 2908664557091200768
Gaia DR3
Gaia DR3 2908664557091200768
System
TOI-431
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.85 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0520 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
1.230 m/s
Transit mid-time (BJD)
2,458,625.9000
Long. of periastron (ω)
0.00°
Angular separation (arcsec)
1.60000
Eq. Temperature
867K
(594 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.348
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Osborn et al. 2021Instrument
HARPS Spectrograph
Publication
2021-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2021 at La Silla Observatory (12 shown).
Host System: TOI-431
Spectral Class
K-type orange
Effective Temperature
4,850 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.731 R☉
Stellar Mass
0.780 M☉
Metallicity [Fe/H]
0.20
Extended Stellar Properties
Surface gravity (log g)
4.600 dex
Stellar density
2.940 g/cm³
Rotational v·sin i
2.50 km/s
Rotation period
30.50 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
30.675 mas
Total Proper Motion
151.700 mas/yr
PM Right Ascension
16.80 mas/yr
PM Declination
150.77 mas/yr
Galactic Cartesian (pc)
x = 0.105 · y = 0.887 · z = -0.450
Equatorial (J2000)
RA 83.26925° · Dec -26.72387°
Galactic ℓ, b
230.329° · -28.137°
Ecliptic λ, β
80.634° · -49.945°
HTM-20 index
556649667
Similar Worlds
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Radius 1.49 R⊕ · 1,069.1 ly