TOI-763 b
Astrophysical Synthesis & Habitability Characterization
TOI-763 b is a confirmed sub-neptune exoplanet orbiting the star TOI-763, located approximately 310.3 light-years (95.13 parsecs) from the Solar System. First announced in 2020 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0543% across the stellar disk), this world measures 2.28 Earth radii and has a measured mass of 9.79 Earth masses. Combining its mass and radius yields a mean bulk density of 4.55 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.88 g⊕ (18.44 m/s²), and an escape velocity of 23.2 km/s.
In its orbital architecture around TOI-763, TOI-763 b completes one full revolution every 5.606 Earth days at a semi-major axis of 0.06 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 116.4 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.04 (ranging from 0.0576 AU at periapsis to 0.0624 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1038 K (+765°C / +1409°F) and receiving 182.94 S⊕ (~248,975 W/m²), TOI-763 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-763 is classified as a solar-type yellow star of spectral type G with an effective photospheric temperature of 5,450 K, a radius of 0.897 R☉, a mass of 0.917 M☉, an estimated bolometric luminosity of 0.637 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.01 dex (near-solar heavy-element abundance). From Earth, TOI-763 shines at apparent V-band magnitude 10.265 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TOI-763 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-763 b sharing its stellar neighborhood alongside TOI-763 c.
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-763 |
| Spectral Type | G |
| Effective Temp (Teff) | 5,450 K |
| Stellar Radius | 0.8970 R☉ |
| Stellar Mass | 0.9170 M☉ |
| Bolometric Luminosity | 0.637 L☉ |
| Metallicity [Fe/H] | 0.010 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 10.265 · G: 9.999 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.060000 AU |
| Orbital Period | 5.606 days |
| Mean Orbital Velocity | 116.4 km/s |
| Orbital Eccentricity (e) | 0.04000 |
| Orbital Inclination (i) | 87.9551° |
| Mean Bulk Density | 4.55 g/cm³ (23.2 km/s vesc) |
| Insolation Flux | 182.9350 S⊕ (~248,975 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 310.300 LY (95.127 pc) |