HD 110113 c
Astrophysical Synthesis & Habitability Characterization
HD 110113 c is a confirmed sub-neptune exoplanet orbiting the star HD 110113, located approximately 346.7 light-years (106.31 parsecs) from the Solar System. First announced in 2021 by La Silla Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 2.114 Earth radii and has a measured mass of 10.5 Earth masses. Combining its mass and radius yields a mean bulk density of 6.13 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 2.35 g⊕ (23.05 m/s²), and an escape velocity of 24.9 km/s.
In its orbital architecture around HD 110113, HD 110113 c completes one full revolution every 6.744 Earth days at a semi-major axis of 0.068 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 109.7 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.045 (ranging from 0.0649 AU at periapsis to 0.0711 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 990 K (+717°C / +1323°F) and receiving 199.90 S⊕ (~272,064 W/m²), HD 110113 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 110113 is classified as a solar-type yellow star of spectral type G with an effective photospheric temperature of 5,732 K, a radius of 0.968 R☉, a mass of 0.997 M☉, an estimated bolometric luminosity of 0.908 L☉. Stellar evolution modeling indicates an estimated stellar age of 4 Gyr and a metallicity of [Fe/H] = 0.14 dex (metal-rich relative to the Sun). From Earth, HD 110113 shines at apparent V-band magnitude 10.09 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The HD 110113 system is a multi-planet architecture hosting 2 confirmed worlds, with HD 110113 c sharing its stellar neighborhood alongside HD 110113 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: La Silla Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 110113 |
| Spectral Type | G |
| Effective Temp (Teff) | 5,732 K |
| Stellar Radius | 0.9680 R☉ |
| Stellar Mass | 0.9970 M☉ |
| Bolometric Luminosity | 0.908 L☉ |
| Metallicity [Fe/H] | 0.140 dex |
| Stellar Age | 4.000 Gyr |
| Apparent Magnitude | V: 10.090 · G: 9.910 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.068000 AU |
| Orbital Period | 6.744 days |
| Mean Orbital Velocity | 109.7 km/s |
| Orbital Eccentricity (e) | 0.04500 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 6.13 g/cm³ (24.9 km/s vesc) |
| Insolation Flux | 199.9000 S⊕ (~272,064 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 346.700 LY (106.307 pc) |