TOI-1846 b
Astrophysical Synthesis & Habitability Characterization
TOI-1846 b is a confirmed super-earth exoplanet orbiting the star TOI-1846, located approximately 154.1 light-years (47.25 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 0.1713% across the stellar disk), this world measures 1.792 Earth radii and has a measured mass of 3.87 Earth masses. Combining its mass and radius yields a mean bulk density of 3.71 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.21 g⊕ (11.87 m/s²), and an escape velocity of 16.4 km/s.
In its orbital architecture around TOI-1846, TOI-1846 b completes one full revolution every 3.931 Earth days at a semi-major axis of 0.03646 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 100.9 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 568 K (+295°C / +563°F) and receiving 17.35 S⊕ (~23,613 W/m²), TOI-1846 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1846 is classified as a stellar host with an effective photospheric temperature of 3,568 K, a radius of 0.397 R☉, a mass of 0.418 M☉, an estimated bolometric luminosity of 0.023 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.2 Gyr and a metallicity of [Fe/H] = 0.169 dex (metal-rich relative to the Sun). From Earth, TOI-1846 shines at apparent V-band magnitude 13.971 (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-1846 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,568 K |
| Stellar Radius | 0.3970 R☉ |
| Stellar Mass | 0.4180 M☉ |
| Bolometric Luminosity | 0.023 L☉ |
| Metallicity [Fe/H] | 0.169 dex |
| Stellar Age | 7.200 Gyr |
| Apparent Magnitude | V: 13.971 · G: 12.992 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.036460 AU |
| Orbital Period | 3.931 days |
| Mean Orbital Velocity | 100.9 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.6500° |
| Mean Bulk Density | 3.71 g/cm³ (16.4 km/s vesc) |
| Insolation Flux | 17.3500 S⊕ (~23,613 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 154.100 LY (47.250 pc) |