TOI-1782.01
Astrophysical Synthesis & Habitability Characterization
TOI-1782.01 is a confirmed sub-neptune exoplanet orbiting the star TOI-1782, located approximately 310.7 light-years (95.27 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.1053% across the stellar disk), this world measures 2.368 Earth radii and has a measured mass of 6.2 Earth masses. Combining its mass and radius yields a mean bulk density of 2.57 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.11 g⊕ (10.89 m/s²), and an escape velocity of 18.1 km/s.
In its orbital architecture around TOI-1782, TOI-1782.01 completes one full revolution every 4.988 Earth days at a semi-major axis of 0.05024 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 109.6 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 698 K (+425°C / +797°F) and receiving 56.25 S⊕ (~76,556 W/m²), TOI-1782.01 orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1782 is classified as a stellar host with an effective photospheric temperature of 4,336 K, a radius of 0.669 R☉, a mass of 0.68 M☉, an estimated bolometric luminosity of 0.142 L☉. From Earth, TOI-1782 shines at apparent V-band magnitude 12.329 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-1782 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-1782.01 sharing its stellar neighborhood alongside TOI-1782.02.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TOI-1782 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,336 K |
| Stellar Radius | 0.6690 R☉ |
| Stellar Mass | 0.6800 M☉ |
| Bolometric Luminosity | 0.142 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 12.329 · G: 12.040 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.050240 AU |
| Orbital Period | 4.988 days |
| Mean Orbital Velocity | 109.6 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 87.9386° |
| Mean Bulk Density | 2.57 g/cm³ (18.1 km/s vesc) |
| Insolation Flux | 56.2500 S⊕ (~76,556 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 310.700 LY (95.265 pc) |