HD 113337 c
Astrophysical Synthesis & Habitability Characterization
HD 113337 c is a confirmed gas giant exoplanet orbiting the star HD 113337, located approximately 118 light-years (36.18 parsecs) from the Solar System. First announced in 2020 by Haute-Provence Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 12.1 Earth radii (1.08 Jupiter radii) and has a measured mass of 6299.677 Earth masses (19.82 Jupiter masses). Combining its mass and radius yields a mean bulk density of 19.61 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 43.03 g⊕ (421.98 m/s²), and an escape velocity of 255.2 km/s.
In its orbital architecture around HD 113337, HD 113337 c completes one full revolution every 5429.935 Earth days (14.87Julian years) at a semi-major axis of 6.805 AU (a wide outer-system orbit beyond Jupiter's 5.20 AU distance in our Solar System). Its mean orbital velocity is approximately 13.6 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.164 carries the world between 5.689 AU at periapsis and 7.921 AU at apoapsis, driving measurable seasonal insolation cycles.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 153 K (-120°C / -184°F) and an incident flux of 0.09 S⊕ (~126 W/m²), surface water and volatile species on HD 113337 c would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 113337 is classified as a warm F-type star of spectral type F6 V with an effective photospheric temperature of 6,774 K, a radius of 1.5 R☉, a mass of 1.41 M☉, an estimated bolometric luminosity of 4.251 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.15 Gyr and a metallicity of [Fe/H] = 0.07 dex (metal-rich relative to the Sun). From Earth, HD 113337 shines at apparent V-band magnitude 6.021 (visible to the unaided human eye under dark skies) in the Northern celestial hemisphere. The HD 113337 system is a multi-planet architecture hosting 2 confirmed worlds, with HD 113337 c sharing its stellar neighborhood alongside HD 113337 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: Haute-Provence Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 113337 |
| Spectral Type | F6 V |
| Effective Temp (Teff) | 6,774 K |
| Stellar Radius | 1.5000 R☉ |
| Stellar Mass | 1.4100 M☉ |
| Bolometric Luminosity | 4.251 L☉ |
| Metallicity [Fe/H] | 0.070 dex |
| Stellar Age | 0.150 Gyr |
| Apparent Magnitude | V: 6.021 · G: 5.912 |
| System Architecture | 3 Stars, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 6.805000 AU |
| Orbital Period | 5429.935 days |
| Mean Orbital Velocity | 13.6 km/s |
| Orbital Eccentricity (e) | 0.16400 |
| Orbital Inclination (i) | 57.4780° |
| Mean Bulk Density | 19.61 g/cm³ (255.2 km/s vesc) |
| Insolation Flux | 0.0926 S⊕ (~126 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 118.000 LY (36.180 pc) |