TOI-1295 b
Astrophysical Synthesis & Habitability Characterization
TOI-1295 b is a confirmed gas giant exoplanet orbiting the star TOI-1295, located approximately 1266.2 light-years (388.23 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 0.7162% across the stellar disk), this world measures 15.693 Earth radii (1.4 Jupiter radii) and has a measured mass of 451.316 Earth masses (1.42 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.64 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.83 g⊕ (17.95 m/s²), and an escape velocity of 60 km/s.
In its orbital architecture around TOI-1295, TOI-1295 b completes one full revolution every 3.197 Earth days at a semi-major axis of 0.047 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 159.9 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.024 (ranging from 0.0459 AU at periapsis to 0.0481 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 2360 K (+2087°C / +3789°F) and receiving 1,800.00 S⊕ (~2,449,800 W/m²), TOI-1295 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1295 is classified as a warm F-type star of spectral type F with an effective photospheric temperature of 6,280 K, a radius of 1.7 R☉, a mass of 1.38 M☉, an estimated bolometric luminosity of 4.033 L☉. Stellar evolution modeling indicates an estimated stellar age of 2 Gyr and a metallicity of [Fe/H] = 0.26 dex (metal-rich relative to the Sun). From Earth, TOI-1295 shines at apparent V-band magnitude 11.303 (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-1295 |
| Spectral Type | F |
| Effective Temp (Teff) | 6,280 K |
| Stellar Radius | 1.7000 R☉ |
| Stellar Mass | 1.3800 M☉ |
| Bolometric Luminosity | 4.033 L☉ |
| Metallicity [Fe/H] | 0.260 dex |
| Stellar Age | 2.000 Gyr |
| Apparent Magnitude | V: 11.303 · G: 11.131 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.047000 AU |
| Orbital Period | 3.197 days |
| Mean Orbital Velocity | 159.9 km/s |
| Orbital Eccentricity (e) | 0.02400 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.64 g/cm³ (60 km/s vesc) |
| Insolation Flux | 1800.0000 S⊕ (~2,449,800 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1266.200 LY (388.227 pc) |