TOI-1346 c
Astrophysical Synthesis & Habitability Characterization
TOI-1346 c is a confirmed sub-neptune exoplanet orbiting the star TOI-1346, located approximately 376.5 light-years (115.45 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 0.0687% across the stellar disk), this world measures 2.23 Earth radii and has a measured mass of 5.6 Earth masses. Combining its mass and radius yields a mean bulk density of 2.78 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.13 g⊕ (11.08 m/s²), and an escape velocity of 17.7 km/s.
In its orbital architecture around TOI-1346, TOI-1346 c completes one full revolution every 5.503 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 928 K (+655°C / +1211°F) and receiving 102.66 S⊕ (~139,726 W/m²), TOI-1346 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1346 is classified as a stellar host with an effective photospheric temperature of 5,099 K, a radius of 0.78 R☉, a mass of 0.82 M☉, an estimated bolometric luminosity of 0.369 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.01 dex (near-solar heavy-element abundance). From Earth, TOI-1346 shines at apparent V-band magnitude 11.693 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-1346 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-1346 c sharing its stellar neighborhood alongside TOI-1346 b.
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-1346 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,099 K |
| Stellar Radius | 0.7800 R☉ |
| Stellar Mass | 0.8200 M☉ |
| Bolometric Luminosity | 0.369 L☉ |
| Metallicity [Fe/H] | -0.010 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 11.693 · G: 11.304 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 5.503 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.3900° |
| Mean Bulk Density | 2.78 g/cm³ (17.7 km/s vesc) |
| Insolation Flux | 102.6644 S⊕ (~139,726 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 376.500 LY (115.450 pc) |