TOI-7394 B b
Astrophysical Synthesis & Habitability Characterization
TOI-7394 B b is a confirmed gas giant exoplanet orbiting the star TOI-7394 B, located approximately 619.7 light-years (189.99 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 2.9971% across the stellar disk), this world measures 11.5 Earth radii (1.03 Jupiter radii) and has a measured mass of 668.74 Earth masses (2.1 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.42 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 5.06 g⊕ (49.62 m/s²), and an escape velocity of 85.3 km/s.
In its orbital architecture around TOI-7394 B, TOI-7394 B b completes one full revolution every 1.253 Earth days at a semi-major axis of 0.01913 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 166.1 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.0271 (ranging from 0.0186 AU at periapsis to 0.0196 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 986 K (+713°C / +1315°F) and receiving 156.70 S⊕ (~213,269 W/m²), TOI-7394 B b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-7394 B is classified as a low-mass red dwarf of spectral type M1 V with an effective photospheric temperature of 3,717 K, a radius of 0.609 R☉, a mass of 0.624 M☉, an estimated bolometric luminosity of 0.064 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.5 dex (metal-rich relative to the Sun). From Earth, TOI-7394 B shines at apparent V-band magnitude 15.522 (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-7394 B |
| Spectral Type | M1 V |
| Effective Temp (Teff) | 3,717 K |
| Stellar Radius | 0.6090 R☉ |
| Stellar Mass | 0.6240 M☉ |
| Bolometric Luminosity | 0.064 L☉ |
| Metallicity [Fe/H] | 0.500 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 15.522 · G: 14.757 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.019130 AU |
| Orbital Period | 1.253 days |
| Mean Orbital Velocity | 166.1 km/s |
| Orbital Eccentricity (e) | 0.02710 |
| Orbital Inclination (i) | 83.9300° |
| Mean Bulk Density | 2.42 g/cm³ (85.3 km/s vesc) |
| Insolation Flux | 156.7000 S⊕ (~213,269 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 619.700 LY (189.986 pc) |