HD 10697 b
Astrophysical Synthesis & Habitability Characterization
HD 10697 b is a confirmed gas giant exoplanet orbiting the star HD 10697, located approximately 108 light-years (33.12 parsecs) from the Solar System. First announced in 1999 by W. M. Keck Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 12.8 Earth radii (1.14 Jupiter radii) and has a measured mass of 1825.289 Earth masses (5.74 Jupiter masses). Combining its mass and radius yields a mean bulk density of 4.8 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 11.14 g⊕ (109.25 m/s²), and an escape velocity of 133.6 km/s.
In its orbital architecture around HD 10697, HD 10697 b completes one full revolution every 1075.38 Earth days (2.94Julian years) at a semi-major axis of 2.051 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 20.7 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.104 carries the world between 1.8377 AU at periapsis and 2.2643 AU at apoapsis, driving measurable seasonal insolation cycles.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.800 R⊕, HD 10697 b 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 10697 is classified as a solar-type yellow star of spectral type G3 V with an effective photospheric temperature of 5,641 K, a radius of 1.8631 R☉, a mass of 0.99 M☉, an estimated bolometric luminosity of 3.153 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.98 Gyr and a metallicity of [Fe/H] = 0.17 dex (metal-rich relative to the Sun). From Earth, HD 10697 shines at apparent V-band magnitude 6.283 (accessible to binoculars and small amateur telescopes) 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: W. M. Keck Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 10697 |
| Spectral Type | G3 V |
| Effective Temp (Teff) | 5,641 K |
| Stellar Radius | 1.8631 R☉ |
| Stellar Mass | 0.9900 M☉ |
| Bolometric Luminosity | 3.153 L☉ |
| Metallicity [Fe/H] | 0.170 dex |
| Stellar Age | 6.980 Gyr |
| Apparent Magnitude | V: 6.283 · G: 6.103 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2.051000 AU |
| Orbital Period | 1075.38 days |
| Mean Orbital Velocity | 20.7 km/s |
| Orbital Eccentricity (e) | 0.10400 |
| Orbital Inclination (i) | 86.1160° |
| Mean Bulk Density | 4.8 g/cm³ (133.6 km/s vesc) |
| Insolation Flux | 0.7124 S⊕ (~970 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 108.000 LY (33.121 pc) |