TOI-469.01
Astrophysical Synthesis & Habitability Characterization
TOI-469.01 is a confirmed sub-neptune exoplanet orbiting the star TOI-469, located approximately 222.4 light-years (68.19 parsecs) from the Solar System. First announced in 2021 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.1018% across the stellar disk), this world measures 3.41 Earth radii (0.3 Jupiter radii) and has a measured mass of 9.1 Earth masses. Combining its mass and radius yields a mean bulk density of 1.27 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.78 g⊕ (7.65 m/s²), and an escape velocity of 18.3 km/s.
In its orbital architecture around TOI-469, TOI-469.01 completes one full revolution every 13.631 Earth days at a semi-major axis of 0.111 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 88.6 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 716 K (+443°C / +829°F) and receiving 74.70 S⊕ (~101,667 W/m²), TOI-469.01 orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-469 is classified as a stellar host with an effective photospheric temperature of 5,289 K, a radius of 0.98 R☉, a mass of 0.901 M☉, an estimated bolometric luminosity of 0.674 L☉. Stellar evolution modeling indicates an estimated stellar age of 11.2 Gyr and a metallicity of [Fe/H] = 0.24 dex (metal-rich relative to the Sun). From Earth, TOI-469 shines at apparent V-band magnitude 9.49 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The TOI-469 system is a multi-planet architecture hosting 3 confirmed worlds, with TOI-469.01 sharing its stellar neighborhood alongside HIP 29442 c, HIP 29442 d.
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-469 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,289 K |
| Stellar Radius | 0.9800 R☉ |
| Stellar Mass | 0.9010 M☉ |
| Bolometric Luminosity | 0.674 L☉ |
| Metallicity [Fe/H] | 0.240 dex |
| Stellar Age | 11.200 Gyr |
| Apparent Magnitude | V: 9.490 · G: 9.275 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.111000 AU |
| Orbital Period | 13.631 days |
| Mean Orbital Velocity | 88.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.3000° |
| Mean Bulk Density | 1.27 g/cm³ (18.3 km/s vesc) |
| Insolation Flux | 74.7000 S⊕ (~101,667 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 222.400 LY (68.192 pc) |