TOI-1772.01
Astrophysical Synthesis & Habitability Characterization
TOI-1772.01 is a confirmed sub-neptune exoplanet orbiting the star TOI-1772, located approximately 318.8 light-years (97.76 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 0.0716% across the stellar disk), this world measures 2.905 Earth radii and has a measured mass of 8.78 Earth masses. Combining its mass and radius yields a mean bulk density of 1.97 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.04 g⊕ (10.2 m/s²), and an escape velocity of 19.4 km/s.
In its orbital architecture around TOI-1772, TOI-1772.01 completes one full revolution every 8.054 Earth days at a semi-major axis of 0.078375 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 105.9 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 878 K (+605°C / +1121°F) and receiving 140.93 S⊕ (~191,806 W/m²), TOI-1772.01 orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1772 is classified as a stellar host with an effective photospheric temperature of 5,583 K, a radius of 0.995 R☉, a mass of 0.99 M☉, an estimated bolometric luminosity of 0.863 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.128 dex (metal-rich relative to the Sun). From Earth, TOI-1772 shines at apparent V-band magnitude 9.955 (accessible to binoculars and small amateur telescopes) 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-1772 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,583 K |
| Stellar Radius | 0.9950 R☉ |
| Stellar Mass | 0.9900 M☉ |
| Bolometric Luminosity | 0.863 L☉ |
| Metallicity [Fe/H] | 0.128 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 9.955 · G: 9.801 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.078375 AU |
| Orbital Period | 8.054 days |
| Mean Orbital Velocity | 105.9 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.97 g/cm³ (19.4 km/s vesc) |
| Insolation Flux | 140.9300 S⊕ (~191,806 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 318.800 LY (97.756 pc) |