TOI-2427 b
Astrophysical Synthesis & Habitability Characterization
TOI-2427 b is a confirmed super-earth exoplanet orbiting the star TOI-2427, located approximately 93 light-years (28.52 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 0.0538% across the stellar disk), this world measures 1.64 Earth radii and has a measured mass of 5.69 Earth masses. Combining its mass and radius yields a mean bulk density of 7.11 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 2.12 g⊕ (20.79 m/s²), and an escape velocity of 20.8 km/s.
In its orbital architecture around TOI-2427, TOI-2427 b completes one full revolution every 1.306 Earth days at a semi-major axis of 0.0202 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 168.3 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.074 carries the world between 0.0187 AU at periapsis and 0.0217 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1148 K (+875°C / +1607°F) and receiving 289.20 S⊕ (~393,601 W/m²), TOI-2427 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2427 is classified as an orange K-type star of spectral type K7 V with an effective photospheric temperature of 4,203 K, a radius of 0.648 R☉, a mass of 0.639 M☉, an estimated bolometric luminosity of 0.118 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.58 Gyr and a metallicity of [Fe/H] = -0.21 dex (metal-poor relative to the Sun). From Earth, TOI-2427 shines at apparent V-band magnitude 10.295 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TOI-2427 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-2427 b sharing its stellar neighborhood alongside TOI-2427 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-2427 |
| Spectral Type | K7 V |
| Effective Temp (Teff) | 4,203 K |
| Stellar Radius | 0.6480 R☉ |
| Stellar Mass | 0.6390 M☉ |
| Bolometric Luminosity | 0.118 L☉ |
| Metallicity [Fe/H] | -0.210 dex |
| Stellar Age | 1.580 Gyr |
| Apparent Magnitude | V: 10.295 · G: 9.818 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.020200 AU |
| Orbital Period | 1.306 days |
| Mean Orbital Velocity | 168.3 km/s |
| Orbital Eccentricity (e) | 0.07400 |
| Orbital Inclination (i) | 82.2700° |
| Mean Bulk Density | 7.11 g/cm³ (20.8 km/s vesc) |
| Insolation Flux | 289.2000 S⊕ (~393,601 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 93.000 LY (28.515 pc) |