HD 25912 c
Astrophysical Synthesis & Habitability Characterization
HD 25912 c is a confirmed gas giant exoplanet orbiting the star HD 25912, located approximately 160.4 light-years (49.17 parsecs) from the Solar System. First announced in 2022 by Multiple Observatories using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 12.2 Earth radii (1.09 Jupiter radii) and has a measured mass of 5252.75 Earth masses (16.53 Jupiter masses). Combining its mass and radius yields a mean bulk density of 15.95 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 35.29 g⊕ (346.08 m/s²), and an escape velocity of 232.1 km/s.
In its orbital architecture around HD 25912, HD 25912 c completes one full revolution every 26308.656 Earth days (72.03Julian years) at a semi-major axis of 17.848 AU (a wide outer-system orbit beyond Jupiter's 5.20 AU distance in our Solar System). Its mean orbital velocity is approximately 7.4 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.051 carries the world between 16.9378 AU at periapsis and 18.7582 AU at apoapsis, driving measurable seasonal insolation cycles.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 67 K (-206°C / -339°F) and an incident flux of 0.00 S⊕ (~5 W/m²), surface water and volatile species on HD 25912 c would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 25912 is classified as a stellar host with an effective photospheric temperature of 5,921 K, a radius of 0.9959 R☉, a mass of 1.08 M☉, an estimated bolometric luminosity of 1.094 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.12 dex (metal-rich relative to the Sun). From Earth, HD 25912 shines at apparent V-band magnitude 8.2 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The HD 25912 system is a multi-planet architecture hosting 2 confirmed worlds, with HD 25912 c sharing its stellar neighborhood alongside HD 25912 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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 25912 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,921 K |
| Stellar Radius | 0.9959 R☉ |
| Stellar Mass | 1.0800 M☉ |
| Bolometric Luminosity | 1.094 L☉ |
| Metallicity [Fe/H] | 0.120 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 8.200 · G: 8.028 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 17.848000 AU |
| Orbital Period | 26308.656 days |
| Mean Orbital Velocity | 7.4 km/s |
| Orbital Eccentricity (e) | 0.05100 |
| Orbital Inclination (i) | 88.3330° |
| Mean Bulk Density | 15.95 g/cm³ (232.1 km/s vesc) |
| Insolation Flux | 0.0034 S⊕ (~5 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 160.400 LY (49.166 pc) |