TOI-1442 b
Astrophysical Synthesis & Habitability Characterization
TOI-1442 b is a confirmed terrestrial exoplanet orbiting the star TOI-1442, located approximately 134.3 light-years (41.17 parsecs) from the Solar System. First announced in 2022 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.1197% across the stellar disk), this world measures 1.17 Earth radii and has a measured mass of 1.71 Earth masses. Combining its mass and radius yields a mean bulk density of 5.89 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.25 g⊕ (12.26 m/s²), and an escape velocity of 13.5 km/s.
In its orbital architecture around TOI-1442, TOI-1442 b completes one full revolution every 0.409 Earth days at a semi-major axis of 0.0071 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 188.8 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1072 K (+799°C / +1470°F) and receiving 207.02 S⊕ (~281,760 W/m²), TOI-1442 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1442 is classified as a stellar host with an effective photospheric temperature of 3,330 K, a radius of 0.31 R☉, a mass of 0.29 M☉, an estimated bolometric luminosity of 0.011 L☉. From Earth, TOI-1442 shines at apparent V-band magnitude 15.39 (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-1442 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,330 K |
| Stellar Radius | 0.3100 R☉ |
| Stellar Mass | 0.2900 M☉ |
| Bolometric Luminosity | 0.011 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 15.390 · G: 13.765 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.007100 AU |
| Orbital Period | 0.409 days |
| Mean Orbital Velocity | 188.8 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 5.89 g/cm³ (13.5 km/s vesc) |
| Insolation Flux | 207.0246 S⊕ (~281,760 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 134.300 LY (41.166 pc) |