HD 67087 c
Astrophysical Synthesis & Habitability Characterization
HD 67087 c is a confirmed gas giant exoplanet orbiting the star HD 67087, located approximately 249.6 light-years (76.52 parsecs) from the Solar System. First announced in 2015 by Multiple Observatories using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 12.9 Earth radii (1.15 Jupiter radii) and has a measured mass of 1540 Earth masses (4.85 Jupiter masses). Combining its mass and radius yields a mean bulk density of 3.96 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 9.25 g⊕ (90.71 m/s²), and an escape velocity of 122.2 km/s.
In its orbital architecture around HD 67087, HD 67087 c completes one full revolution every 2374 Earth days (6.5Julian years) at a semi-major axis of 3.86 AU (corresponding to the middle-system regime between Mars at 1.52 AU and Jupiter at 5.20 AU). Its mean orbital velocity is approximately 17.7 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.76, swinging from 0.9264 AU at periapsis out to 6.7936 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.900 R⊕, HD 67087 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 HD 67087 is classified as a warm F-type star of spectral type F8 V with an effective photospheric temperature of 6,330 K, a radius of 1.55 R☉, a mass of 1.36 M☉, an estimated bolometric luminosity of 3.461 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.45 Gyr and a metallicity of [Fe/H] = 0.25 dex (metal-rich relative to the Sun). From Earth, HD 67087 shines at apparent V-band magnitude 8.05 (accessible to binoculars and small amateur telescopes) in the Northern celestial hemisphere. The HD 67087 system is a multi-planet architecture hosting 2 confirmed worlds, with HD 67087 c sharing its stellar neighborhood alongside HD 67087 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 67087 |
| Spectral Type | F8 V |
| Effective Temp (Teff) | 6,330 K |
| Stellar Radius | 1.5500 R☉ |
| Stellar Mass | 1.3600 M☉ |
| Bolometric Luminosity | 3.461 L☉ |
| Metallicity [Fe/H] | 0.250 dex |
| Stellar Age | 1.450 Gyr |
| Apparent Magnitude | V: 8.050 · G: 7.922 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 3.860000 AU |
| Orbital Period | 2374 days |
| Mean Orbital Velocity | 17.7 km/s |
| Orbital Eccentricity (e) | 0.76000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3.96 g/cm³ (122.2 km/s vesc) |
| Insolation Flux | 0.2327 S⊕ (~317 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 249.600 LY (76.522 pc) |