TOI-6894 b
Astrophysical Synthesis & Habitability Characterization
TOI-6894 b is a confirmed gas giant exoplanet orbiting the star TOI-6894, located approximately 240.7 light-years (73.81 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 14.9036% across the stellar disk), this world measures 9.584 Earth radii (0.86 Jupiter radii) and has a measured mass of 53.395 Earth masses (0.17 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.33 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.58 g⊕ (5.69 m/s²), and an escape velocity of 26.4 km/s.
In its orbital architecture around TOI-6894, TOI-6894 b completes one full revolution every 3.371 Earth days at a semi-major axis of 0.02604 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 84 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.029 (ranging from 0.0253 AU at periapsis to 0.0268 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 418 K (+145°C / +293°F) and receiving 5.54 S⊕ (~7,540 W/m²), TOI-6894 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-6894 is classified as a stellar host with an effective photospheric temperature of 3,007 K, a radius of 0.2276 R☉, a mass of 0.207 M☉, an estimated bolometric luminosity of 0.00380 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.142 dex (metal-rich relative to the Sun). From Earth, TOI-6894 shines at apparent Gaia G-band magnitude 16.309 (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-6894 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,007 K |
| Stellar Radius | 0.2276 R☉ |
| Stellar Mass | 0.2070 M☉ |
| Bolometric Luminosity | 0.00380 L☉ |
| Metallicity [Fe/H] | 0.142 dex |
| Stellar Age | — |
| Apparent Magnitude | · G: 16.309 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.026040 AU |
| Orbital Period | 3.371 days |
| Mean Orbital Velocity | 84 km/s |
| Orbital Eccentricity (e) | 0.02900 |
| Orbital Inclination (i) | 89.5800° |
| Mean Bulk Density | 0.33 g/cm³ (26.4 km/s vesc) |
| Insolation Flux | 5.5400 S⊕ (~7,540 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 240.700 LY (73.813 pc) |