TOI-1775 b
Astrophysical Synthesis & Habitability Characterization
TOI-1775 b is a confirmed gas giant exoplanet orbiting the star TOI-1775, located approximately 486.7 light-years (149.23 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 0.7923% across the stellar disk), this world measures 8.047 Earth radii (0.72 Jupiter radii) and has a measured mass of 96 Earth masses (0.3 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.02 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.48 g⊕ (14.51 m/s²), and an escape velocity of 38.6 km/s.
In its orbital architecture around TOI-1775, TOI-1775 b completes one full revolution every 10.241 Earth days at a semi-major axis of 0.08 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 85 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 708 K (+435°C / +815°F) and receiving 55.44 S⊕ (~75,457 W/m²), TOI-1775 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1775 is classified as a stellar host with an effective photospheric temperature of 5,284 K, a radius of 0.8288 R☉, a mass of 0.9218 M☉, an estimated bolometric luminosity of 0.48 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.8 Gyr and a metallicity of [Fe/H] = 0.162 dex (metal-rich relative to the Sun). From Earth, TOI-1775 shines at apparent V-band magnitude 11.648 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
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-1775 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,284 K |
| Stellar Radius | 0.8288 R☉ |
| Stellar Mass | 0.9218 M☉ |
| Bolometric Luminosity | 0.48 L☉ |
| Metallicity [Fe/H] | 0.162 dex |
| Stellar Age | 0.800 Gyr |
| Apparent Magnitude | V: 11.648 · G: 11.450 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.080000 AU |
| Orbital Period | 10.241 days |
| Mean Orbital Velocity | 85 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.02 g/cm³ (38.6 km/s vesc) |
| Insolation Flux | 55.4426 S⊕ (~75,457 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 486.700 LY (149.234 pc) |