TOI-1437 b
Astrophysical Synthesis & Habitability Characterization
TOI-1437 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1437, located approximately 336.9 light-years (103.3 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 0.0308% across the stellar disk), this world measures 2.24 Earth radii and has a measured mass of 9.6 Earth masses. Combining its mass and radius yields a mean bulk density of 4.71 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.91 g⊕ (18.73 m/s²), and an escape velocity of 23.2 km/s.
In its orbital architecture around TOI-1437, TOI-1437 b completes one full revolution every 18.841 Earth days at a semi-major axis of 0.14 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 80.8 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.17 carries the world between 0.1162 AU at periapsis and 0.1638 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 794 K (+521°C / +970°F) and receiving 82.00 S⊕ (~111,602 W/m²), TOI-1437 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1437 is classified as a stellar host with an effective photospheric temperature of 6,008 K, a radius of 1.17 R☉, a mass of 1.1 M☉, an estimated bolometric luminosity of 1.6 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.7 Gyr and a metallicity of [Fe/H] = -0.492 dex (metal-poor relative to the Sun). From Earth, TOI-1437 shines at apparent V-band magnitude 9.173 (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-1437 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,008 K |
| Stellar Radius | 1.1700 R☉ |
| Stellar Mass | 1.1000 M☉ |
| Bolometric Luminosity | 1.6 L☉ |
| Metallicity [Fe/H] | -0.492 dex |
| Stellar Age | 6.700 Gyr |
| Apparent Magnitude | V: 9.173 · G: 9.079 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.140000 AU |
| Orbital Period | 18.841 days |
| Mean Orbital Velocity | 80.8 km/s |
| Orbital Eccentricity (e) | 0.17000 |
| Orbital Inclination (i) | 89.5300° |
| Mean Bulk Density | 4.71 g/cm³ (23.2 km/s vesc) |
| Insolation Flux | 82.0000 S⊕ (~111,602 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 336.900 LY (103.297 pc) |