TOI-4734 b
Astrophysical Synthesis & Habitability Characterization
TOI-4734 b is a confirmed gas giant exoplanet orbiting the star TOI-4734, located approximately 1836.5 light-years (563.07 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 0.2905% across the stellar disk), this world measures 10.918 Earth radii (0.97 Jupiter radii) and has a measured mass of 61.659 Earth masses (0.19 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.26 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.52 g⊕ (5.1 m/s²), and an escape velocity of 26.6 km/s.
In its orbital architecture around TOI-4734, TOI-4734 b completes one full revolution every 6.236 Earth days at a semi-major axis of 0.074 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 129.1 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.12 carries the world between 0.0651 AU at periapsis and 0.0829 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1468 K (+1195°C / +2183°F) and receiving 775.00 S⊕ (~1,054,775 W/m²), TOI-4734 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4734 is classified as a stellar host with an effective photospheric temperature of 6,070 K, a radius of 1.857 R☉, a mass of 1.391 M☉, an estimated bolometric luminosity of 4.2 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.2 Gyr and a metallicity of [Fe/H] = 0.288 dex (metal-rich relative to the Sun). From Earth, TOI-4734 shines at apparent V-band magnitude 12.358 (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-4734 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,070 K |
| Stellar Radius | 1.8570 R☉ |
| Stellar Mass | 1.3910 M☉ |
| Bolometric Luminosity | 4.2 L☉ |
| Metallicity [Fe/H] | 0.288 dex |
| Stellar Age | 3.200 Gyr |
| Apparent Magnitude | V: 12.358 · G: 12.381 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.074000 AU |
| Orbital Period | 6.236 days |
| Mean Orbital Velocity | 129.1 km/s |
| Orbital Eccentricity (e) | 0.12000 |
| Orbital Inclination (i) | 89.2000° |
| Mean Bulk Density | 0.26 g/cm³ (26.6 km/s vesc) |
| Insolation Flux | 775.0000 S⊕ (~1,054,775 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1836.500 LY (563.068 pc) |