BD+15 2375 b
Astrophysical Synthesis & Habitability Characterization
BD+15 2375 b is a confirmed gas giant exoplanet orbiting the star BD+15 2375, located approximately 2505 light-years (768.05 parsecs) from the Solar System. First announced in 2016 by Roque de los Muchachos Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.8 Earth radii (1.23 Jupiter radii) and has a measured mass of 337.218 Earth masses (1.06 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.71 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.77 g⊕ (17.36 m/s²), and an escape velocity of 55.3 km/s.
In its orbital architecture around BD+15 2375, BD+15 2375 b completes one full revolution every 153.22 Earth days at a semi-major axis of 0.576 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 40.9 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.001 (ranging from 0.5754 AU at periapsis to 0.5766 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 884 K (+611°C / +1132°F) and receiving 111.98 S⊕ (~152,410 W/m²), BD+15 2375 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star BD+15 2375 is classified as a solar-type yellow star of spectral type G5 with an effective photospheric temperature of 4,649 K, a radius of 8.95 R☉, a mass of 1.08 M☉, an estimated bolometric luminosity of 33.572 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.41 Gyr and a metallicity of [Fe/H] = -0.22 dex (metal-poor relative to the Sun). From Earth, BD+15 2375 shines at apparent V-band magnitude 10.41 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
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: Roque de los Muchachos Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | BD+15 2375 |
| Spectral Type | G5 |
| Effective Temp (Teff) | 4,649 K |
| Stellar Radius | 8.9500 R☉ |
| Stellar Mass | 1.0800 M☉ |
| Bolometric Luminosity | 33.572 L☉ |
| Metallicity [Fe/H] | -0.220 dex |
| Stellar Age | 7.410 Gyr |
| Apparent Magnitude | V: 10.410 · G: 9.992 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.576000 AU |
| Orbital Period | 153.22 days |
| Mean Orbital Velocity | 40.9 km/s |
| Orbital Eccentricity (e) | 0.00100 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.71 g/cm³ (55.3 km/s vesc) |
| Insolation Flux | 111.9838 S⊕ (~152,410 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2505.000 LY (768.045 pc) |