KIC 7917485 b
Astrophysical Synthesis & Habitability Characterization
KIC 7917485 b is a confirmed gas giant exoplanet orbiting the star KIC 7917485, located approximately 4510.4 light-years (1382.89 parsecs) from the Solar System. First announced in 2016 by Kepler using the Pulsation Timing Variations detection technique, this world measures 12.4 Earth radii (1.11 Jupiter radii) and has a measured mass of 3750.394 Earth masses (11.8 Jupiter masses). Combining its mass and radius yields a mean bulk density of 10.85 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 24.39 g⊕ (239.18 m/s²), and an escape velocity of 194.5 km/s.
In its orbital architecture around KIC 7917485, KIC 7917485 b completes one full revolution every 840 Earth days (2.3Julian years). Its moderate orbital eccentricity of e = 0.15 driving measurable seasonal insolation cycles.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.400 R⊕, KIC 7917485 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 KIC 7917485 is classified as a luminous A-type star of spectral type A with an effective photospheric temperature of 7,067 K, a radius of 2.0099 R☉, a mass of 1.63 M☉, an estimated bolometric luminosity of 9.04 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.02 dex (near-solar heavy-element abundance). From Earth, KIC 7917485 shines at apparent V-band magnitude 13.166 (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: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | KIC 7917485 |
| Spectral Type | A |
| Effective Temp (Teff) | 7,067 K |
| Stellar Radius | 2.0099 R☉ |
| Stellar Mass | 1.6300 M☉ |
| Bolometric Luminosity | 9.04 L☉ |
| Metallicity [Fe/H] | -0.020 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 13.166 · G: 13.109 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 840 days |
| Orbital Eccentricity (e) | 0.15000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 10.85 g/cm³ (194.5 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4510.400 LY (1382.890 pc) |