TOI-2641 b
Astrophysical Synthesis & Habitability Characterization
TOI-2641 b is a confirmed gas giant exoplanet orbiting the star TOI-2641, located approximately 1122.1 light-years (344.05 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 1.5432% across the stellar disk), this world measures 18.103 Earth radii (1.62 Jupiter radii) and has a measured mass of 122.682 Earth masses (0.39 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.11 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.37 g⊕ (3.63 m/s²), and an escape velocity of 29.1 km/s.
In its orbital architecture around TOI-2641, TOI-2641 b completes one full revolution every 4.881 Earth days at a semi-major axis of 0.0607 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 135.3 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.18 carries the world between 0.0498 AU at periapsis and 0.0716 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1387 K (+1114°C / +2037°F) and receiving 602.00 S⊕ (~819,322 W/m²), TOI-2641 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2641 is classified as a warm F-type star of spectral type F9 V with an effective photospheric temperature of 6,100 K, a radius of 1.336 R☉, a mass of 1.16 M☉, an estimated bolometric luminosity of 2.217 L☉. Stellar evolution modeling indicates an estimated stellar age of 10.8 Gyr and a metallicity of [Fe/H] = -0.15 dex (metal-poor relative to the Sun). From Earth, TOI-2641 shines at apparent V-band magnitude 11.693 (faint and requiring research-grade or CCD telescopic photometry) 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-2641 |
| Spectral Type | F9 V |
| Effective Temp (Teff) | 6,100 K |
| Stellar Radius | 1.3360 R☉ |
| Stellar Mass | 1.1600 M☉ |
| Bolometric Luminosity | 2.217 L☉ |
| Metallicity [Fe/H] | -0.150 dex |
| Stellar Age | 10.800 Gyr |
| Apparent Magnitude | V: 11.693 · G: 11.571 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.060700 AU |
| Orbital Period | 4.881 days |
| Mean Orbital Velocity | 135.3 km/s |
| Orbital Eccentricity (e) | 0.18000 |
| Orbital Inclination (i) | 83.7500° |
| Mean Bulk Density | 0.11 g/cm³ (29.1 km/s vesc) |
| Insolation Flux | 602.0000 S⊕ (~819,322 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1122.100 LY (344.045 pc) |