TOI-1752 c
Astrophysical Synthesis & Habitability Characterization
TOI-1752 c is a confirmed sub-neptune exoplanet orbiting the star TOI-1752, located approximately 336 light-years (103.02 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.1569% across the stellar disk), this world measures 2.29 Earth radii and has a measured mass of 5.86 Earth masses. Combining its mass and radius yields a mean bulk density of 2.69 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.12 g⊕ (10.98 m/s²), and an escape velocity of 17.9 km/s.
In its orbital architecture around TOI-1752, TOI-1752 c completes one full revolution every 32.714 Earth days at a semi-major axis of 0.1614 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 53.7 km/s (compared to Earth's 29.8 km/s).
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 2.290 R⊕, TOI-1752 c exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star TOI-1752 is classified as a low-mass red dwarf of spectral type M1.0±0.5 V with an effective photospheric temperature of 3,762 K, a radius of 0.53 R☉, a mass of 0.524 M☉, an estimated bolometric luminosity of 0.05 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.11 dex (metal-poor relative to the Sun). From Earth, TOI-1752 shines at apparent V-band magnitude 14.62 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-1752 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-1752 c sharing its stellar neighborhood alongside TOI-1752 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-1752 |
| Spectral Type | M1.0±0.5 V |
| Effective Temp (Teff) | 3,762 K |
| Stellar Radius | 0.5300 R☉ |
| Stellar Mass | 0.5240 M☉ |
| Bolometric Luminosity | 0.05 L☉ |
| Metallicity [Fe/H] | -0.110 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.620 · G: 13.817 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.161400 AU |
| Orbital Period | 32.714 days |
| Mean Orbital Velocity | 53.7 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.6300° |
| Mean Bulk Density | 2.69 g/cm³ (17.9 km/s vesc) |
| Insolation Flux | 1.6973 S⊕ (~2,310 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 336.000 LY (103.021 pc) |