TOI-4641 b
Astrophysical Synthesis & Habitability Characterization
TOI-4641 b is a confirmed gas giant exoplanet orbiting the star TOI-4641, located approximately 281.6 light-years (86.35 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 0.1902% across the stellar disk), this world measures 8.183 Earth radii (0.73 Jupiter radii) and has a measured mass of 1229.996 Earth masses (3.87 Jupiter masses). Combining its mass and radius yields a mean bulk density of 12.38 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 18.37 g⊕ (180.15 m/s²), and an escape velocity of 137.1 km/s.
In its orbital architecture around TOI-4641, TOI-4641 b completes one full revolution every 22.093 Earth days at a semi-major axis of 0.173 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 85.2 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.074 carries the world between 0.1602 AU at periapsis and 0.1858 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 950 K (+677°C / +1251°F) and receiving 192.58 S⊕ (~262,102 W/m²), TOI-4641 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4641 is classified as a stellar host with an effective photospheric temperature of 6,560 K, a radius of 1.72 R☉, a mass of 1.41 M☉, an estimated bolometric luminosity of 4.915 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.69 Gyr and a metallicity of [Fe/H] = -0.09 dex (near-solar heavy-element abundance). From Earth, TOI-4641 shines at apparent V-band magnitude 7.51 (accessible to binoculars and small amateur telescopes) 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-4641 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,560 K |
| Stellar Radius | 1.7200 R☉ |
| Stellar Mass | 1.4100 M☉ |
| Bolometric Luminosity | 4.915 L☉ |
| Metallicity [Fe/H] | -0.090 dex |
| Stellar Age | 2.690 Gyr |
| Apparent Magnitude | V: 7.510 · G: 7.408 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.173000 AU |
| Orbital Period | 22.093 days |
| Mean Orbital Velocity | 85.2 km/s |
| Orbital Eccentricity (e) | 0.07400 |
| Orbital Inclination (i) | 87.9000° |
| Mean Bulk Density | 12.38 g/cm³ (137.1 km/s vesc) |
| Insolation Flux | 192.5802 S⊕ (~262,102 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 281.600 LY (86.350 pc) |