TOI-4443.01
Astrophysical Synthesis & Habitability Characterization
TOI-4443.01 is a confirmed super-earth exoplanet orbiting the star TOI-4443, located approximately 182.9 light-years (56.07 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 0.024% across the stellar disk), this world measures 1.719 Earth radii and has a measured mass of 3.6 Earth masses. Combining its mass and radius yields a mean bulk density of 3.91 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.22 g⊕ (11.96 m/s²), and an escape velocity of 16.2 km/s.
In its orbital architecture around TOI-4443, TOI-4443.01 completes one full revolution every 1.85 Earth days at a semi-major axis of 0.029963 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 176.2 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1639 K (+1366°C / +2491°F) and receiving 1,194.21 S⊕ (~1,625,320 W/m²), TOI-4443.01 orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4443 is classified as a stellar host with an effective photospheric temperature of 5,834 K, a radius of 1.0173 R☉, a mass of 1.0491 M☉, an estimated bolometric luminosity of 1.076 L☉. From Earth, TOI-4443 shines at apparent V-band magnitude 8.493 (accessible to binoculars and small amateur telescopes) in the Northern celestial hemisphere. The TOI-4443 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-4443.01 sharing its stellar neighborhood alongside TOI-4443 c.
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-4443 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,834 K |
| Stellar Radius | 1.0173 R☉ |
| Stellar Mass | 1.0491 M☉ |
| Bolometric Luminosity | 1.076 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 8.493 · G: 8.336 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.029963 AU |
| Orbital Period | 1.85 days |
| Mean Orbital Velocity | 176.2 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3.91 g/cm³ (16.2 km/s vesc) |
| Insolation Flux | 1194.2104 S⊕ (~1,625,320 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 182.900 LY (56.074 pc) |