TOI-2141 c
Astrophysical Synthesis & Habitability Characterization
TOI-2141 c is a confirmed sub-neptune exoplanet orbiting the star TOI-2141, located approximately 253.4 light-years (77.68 parsecs) from the Solar System. First announced in 2025 by Roque de los Muchachos Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 2.35 Earth radii and has a measured mass of 6.14 Earth masses. Combining its mass and radius yields a mean bulk density of 2.61 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.11 g⊕ (10.89 m/s²), and an escape velocity of 18.1 km/s.
In its orbital architecture around TOI-2141, TOI-2141 c completes one full revolution every 5.462 Earth days at a semi-major axis of 0.0585 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 116.5 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1095 K (+822°C / +1512°F) and receiving 241.00 S⊕ (~328,001 W/m²), TOI-2141 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2141 is classified as a stellar host with an effective photospheric temperature of 5,635 K, a radius of 0.95 R☉, a mass of 0.896 M☉, an estimated bolometric luminosity of 0.816 L☉. Stellar evolution modeling indicates an estimated stellar age of 9 Gyr and a metallicity of [Fe/H] = -0.14 dex (metal-poor relative to the Sun). From Earth, TOI-2141 shines at apparent V-band magnitude 9.46 (accessible to binoculars and small amateur telescopes) in the Northern celestial hemisphere. The TOI-2141 system is a multi-planet architecture hosting 3 confirmed worlds, with TOI-2141 c sharing its stellar neighborhood alongside TOI-2141 b, TOI-2141 d.
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: Roque de los Muchachos Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TOI-2141 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,635 K |
| Stellar Radius | 0.9500 R☉ |
| Stellar Mass | 0.8960 M☉ |
| Bolometric Luminosity | 0.816 L☉ |
| Metallicity [Fe/H] | -0.140 dex |
| Stellar Age | 9.000 Gyr |
| Apparent Magnitude | V: 9.460 · G: 9.344 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.058500 AU |
| Orbital Period | 5.462 days |
| Mean Orbital Velocity | 116.5 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.61 g/cm³ (18.1 km/s vesc) |
| Insolation Flux | 241.0000 S⊕ (~328,001 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 253.400 LY (77.682 pc) |