Key parameters at a glance
- A radius of 2.73 Earth radii
- A mass of 19.10 Earth masses
- Surface gravity around 2.56 g
- An orbital period of 8.024 days
- Semi-major axis 0.0578 AU
- Equilibrium temperature 435 K (162 °C)
- Distance from Earth 171.27 light-years
- Earth Similarity Index 0.506
- Travel time at Voyager 1 speed 3,020,376 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-782 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#821of 1978
top 41.5%
This planet
2.73R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-782 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.73 | 11.21 |
| Mass (M⊕) | 1.00 | 19.10 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | 2.56 | 2.53 |
| Insolation (S⊕) | 1.00 | 5.91 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 19.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 429358906
Gaia DR2
Gaia DR2 3518374197418907648
Gaia DR3
Gaia DR3 3518374197418907648
System
TOI-782
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.02 Earth days (2.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0578 AU.
Transit Fingerprint
Depth
0.401 %
Duration
1.708 h
Impact parameter b
0.460
Rp / R★
0.060600
Transit midpoint (BJD)
2,458,577.0419
Photometric dip
Transit produces a flux drop of 4,010 ppm lasting ≈ 1.71 h.
Extended Orbital Architecture
Planet / star radius ratio
0.060600
Semi-major axis / stellar radius
30.070
Impact parameter (b)
0.460
RV semi-amplitude (K)
11.600 m/s
Transit mid-time (BJD)
2,458,577.0419
Angular separation (arcsec)
1.10000
Eq. Temperature
435K
(162 °C)
Insolation (S⊕)
5.91
Earth = 1.00
Earth Similarity (ESI)
0.506
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.
Discovery Paper
Primary reference
Hori et al. 2024Instrument
TESS CCD Array
Publication
2024-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-782
Spectral Class
M-type red dwarf
Effective Temperature
3,370 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.413 R☉
Stellar Mass
0.397 M☉
Metallicity [Fe/H]
0.34
Extended Stellar Properties
Surface gravity (log g)
4.804 dex
Stellar density
7.990 g/cm³
Systemic radial velocity
-7.80 km/s
Rotation period
65.26 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
19.015 mas
Total Proper Motion
167.809 mas/yr
PM Right Ascension
-163.72 mas/yr
PM Declination
-36.82 mas/yr
Galactic Cartesian (pc)
x = -0.944 · y = -0.065 · z = -0.324
Equatorial (J2000)
RA 183.92036° · Dec -18.91034°
Galactic ℓ, b
291.307° · 43.153°
Ecliptic λ, β
191.277° · -15.761°
HTM-20 index
1727169594
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