TOI-622 b
Astrophysical Synthesis & Habitability Characterization
TOI-622 b is a confirmed gas giant exoplanet orbiting the star TOI-622, located approximately 402.1 light-years (123.3 parsecs) from the Solar System. First announced in 2023 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.3581% across the stellar disk), this world measures 9.236 Earth radii (0.82 Jupiter radii) and has a measured mass of 96.302 Earth masses (0.3 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.67 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.13 g⊕ (11.08 m/s²), and an escape velocity of 36.1 km/s.
In its orbital architecture around TOI-622, TOI-622 b completes one full revolution every 6.403 Earth days at a semi-major axis of 0.0708 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 120.3 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.42, swinging from 0.0411 AU at periapsis out to 0.1005 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1388 K (+1115°C / +2039°F) and receiving 602.00 S⊕ (~819,322 W/m²), TOI-622 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-622 is classified as a warm F-type star of spectral type F6 V with an effective photospheric temperature of 6,400 K, a radius of 1.415 R☉, a mass of 1.313 M☉, an estimated bolometric luminosity of 3.014 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.9 Gyr and a metallicity of [Fe/H] = 0.09 dex (metal-rich relative to the Sun). From Earth, TOI-622 shines at apparent V-band magnitude 8.995 (accessible to binoculars and small amateur telescopes) in the Southern 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-622 |
| Spectral Type | F6 V |
| Effective Temp (Teff) | 6,400 K |
| Stellar Radius | 1.4150 R☉ |
| Stellar Mass | 1.3130 M☉ |
| Bolometric Luminosity | 3.014 L☉ |
| Metallicity [Fe/H] | 0.090 dex |
| Stellar Age | 0.900 Gyr |
| Apparent Magnitude | V: 8.995 · G: 8.891 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.070800 AU |
| Orbital Period | 6.403 days |
| Mean Orbital Velocity | 120.3 km/s |
| Orbital Eccentricity (e) | 0.42000 |
| Orbital Inclination (i) | 86.6200° |
| Mean Bulk Density | 0.67 g/cm³ (36.1 km/s vesc) |
| Insolation Flux | 602.0000 S⊕ (~819,322 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 402.100 LY (123.297 pc) |