TOI-6695 b
Astrophysical Synthesis & Habitability Characterization
TOI-6695 b is a confirmed gas giant exoplanet orbiting the star TOI-6695, located approximately 921.5 light-years (282.54 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 0.3316% across the stellar disk), this world measures 9.528 Earth radii (0.85 Jupiter radii) and has a measured mass of 66.744 Earth masses (0.21 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.43 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.74 g⊕ (7.26 m/s²), and an escape velocity of 29.6 km/s.
In its orbital architecture around TOI-6695, TOI-6695 b completes one full revolution every 80.389 Earth days at a semi-major axis of 0.402 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 54.4 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.04 (ranging from 0.3859 AU at periapsis to 0.4181 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 599 K (+326°C / +619°F) and receiving 85.94 S⊕ (~116,962 W/m²), TOI-6695 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-6695 is classified as a warm F-type star of spectral type F5V-G0V with an effective photospheric temperature of 6,400 K, a radius of 1.517 R☉, a mass of 1.338 M☉, an estimated bolometric luminosity of 3.464 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.1 Gyr and a metallicity of [Fe/H] = 0.2 dex (metal-rich relative to the Sun). From Earth, TOI-6695 shines at apparent V-band magnitude 10.768 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TOI-6695 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-6695 b sharing its stellar neighborhood alongside TOI-6695 c.
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-6695 |
| Spectral Type | F5V-G0V |
| Effective Temp (Teff) | 6,400 K |
| Stellar Radius | 1.5170 R☉ |
| Stellar Mass | 1.3380 M☉ |
| Bolometric Luminosity | 3.464 L☉ |
| Metallicity [Fe/H] | 0.200 dex |
| Stellar Age | 2.100 Gyr |
| Apparent Magnitude | V: 10.768 · G: 10.745 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.402000 AU |
| Orbital Period | 80.389 days |
| Mean Orbital Velocity | 54.4 km/s |
| Orbital Eccentricity (e) | 0.04000 |
| Orbital Inclination (i) | 90.6200° |
| Mean Bulk Density | 0.43 g/cm³ (29.6 km/s vesc) |
| Insolation Flux | 85.9385 S⊕ (~116,962 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 921.500 LY (282.536 pc) |