TOI-1347 c
Astrophysical Synthesis & Habitability Characterization
TOI-1347 c is a confirmed super-earth exoplanet orbiting the star TOI-1347, located approximately 481 light-years (147.48 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 0.0312% across the stellar disk), this world measures 1.6 Earth radii and has a measured mass of 6.4 Earth masses. Combining its mass and radius yields a mean bulk density of 8.62 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 2.5 g⊕ (24.52 m/s²), and an escape velocity of 22.4 km/s.
In its orbital architecture around TOI-1347, TOI-1347 c completes one full revolution every 4.842 Earth days at a semi-major axis of 0.0546 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 122.7 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1000 K (+727°C / +1341°F) and receiving 183.66 S⊕ (~249,967 W/m²), TOI-1347 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1347 is classified as a stellar host with an effective photospheric temperature of 5,464 K, a radius of 0.83 R☉, a mass of 0.913 M☉, an estimated bolometric luminosity of 0.551 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.4 Gyr and a metallicity of [Fe/H] = 0.04 dex (near-solar heavy-element abundance). From Earth, TOI-1347 shines at apparent V-band magnitude 11.168 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-1347 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-1347 c sharing its stellar neighborhood alongside TOI-1347 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-1347 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,464 K |
| Stellar Radius | 0.8300 R☉ |
| Stellar Mass | 0.9130 M☉ |
| Bolometric Luminosity | 0.551 L☉ |
| Metallicity [Fe/H] | 0.040 dex |
| Stellar Age | 1.400 Gyr |
| Apparent Magnitude | V: 11.168 · G: 11.209 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.054600 AU |
| Orbital Period | 4.842 days |
| Mean Orbital Velocity | 122.7 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.5000° |
| Mean Bulk Density | 8.62 g/cm³ (22.4 km/s vesc) |
| Insolation Flux | 183.6642 S⊕ (~249,967 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 481.000 LY (147.476 pc) |