BD-08 2823 c
Astrophysical Synthesis & Habitability Characterization
BD-08 2823 c is a confirmed gas giant exoplanet orbiting the star BD-08 2823, located approximately 134.8 light-years (41.33 parsecs) from the Solar System. First announced in 2009 by La Silla Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 12.5 Earth radii (1.12 Jupiter radii) and has a measured mass of 104 Earth masses (0.33 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.29 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.67 g⊕ (6.57 m/s²), and an escape velocity of 32.3 km/s.
In its orbital architecture around BD-08 2823, BD-08 2823 c completes one full revolution every 237.6 Earth days at a semi-major axis of 0.68 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 31.1 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.19 carries the world between 0.5508 AU at periapsis and 0.8092 AU at apoapsis, driving measurable seasonal insolation cycles.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.500 R⊕, BD-08 2823 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 BD-08 2823 is classified as an orange K-type star of spectral type K3 V with an effective photospheric temperature of 4,746 K, a radius of 0.71 R☉, a mass of 0.74 M☉, an estimated bolometric luminosity of 0.229 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.5 Gyr and a metallicity of [Fe/H] = -0.07 dex (near-solar heavy-element abundance). From Earth, BD-08 2823 shines at apparent V-band magnitude 9.86 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The BD-08 2823 system is a multi-planet architecture hosting 2 confirmed worlds, with BD-08 2823 c sharing its stellar neighborhood alongside BD-08 2823 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 | BD-08 2823 |
| Spectral Type | K3 V |
| Effective Temp (Teff) | 4,746 K |
| Stellar Radius | 0.7100 R☉ |
| Stellar Mass | 0.7400 M☉ |
| Bolometric Luminosity | 0.229 L☉ |
| Metallicity [Fe/H] | -0.070 dex |
| Stellar Age | 4.500 Gyr |
| Apparent Magnitude | V: 9.860 · G: 9.503 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.680000 AU |
| Orbital Period | 237.6 days |
| Mean Orbital Velocity | 31.1 km/s |
| Orbital Eccentricity (e) | 0.19000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.29 g/cm³ (32.3 km/s vesc) |
| Insolation Flux | 0.5117 S⊕ (~696 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 134.800 LY (41.334 pc) |