TOI-1782.02
Astrophysical Synthesis & Habitability Characterization
TOI-1782.02 is a confirmed super-earth 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 0.0635% across the stellar disk), this world measures 1.839 Earth radii and has a measured mass of 4.04 Earth masses. Combining its mass and radius yields a mean bulk density of 3.58 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.19 g⊕ (11.67 m/s²), and an escape velocity of 16.6 km/s.
In its orbital architecture around TOI-1782, TOI-1782.02 completes one full revolution every 1.829 Earth days at a semi-major axis of 0.025739 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 153.1 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 975 K (+702°C / +1296°F) and receiving 214.17 S⊕ (~291,485 W/m²), TOI-1782.02 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-1782.02 sharing its stellar neighborhood alongside TOI-1782.01.
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) | 0.025739 AU |
| Orbital Period | 1.829 days |
| Mean Orbital Velocity | 153.1 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3.58 g/cm³ (16.6 km/s vesc) |
| Insolation Flux | 214.1700 S⊕ (~291,485 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 310.700 LY (95.265 pc) |