Kepler-487 b
Astrophysical Synthesis & Habitability Characterization
Kepler-487 b is a confirmed gas giant exoplanet orbiting the star Kepler-487, located approximately 2845.2 light-years (872.34 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 1.4155% across the stellar disk), this world has a measured radius of 11.42 Earth radii (1.02 R♃), though radial-velocity mass constraints remain unmeasured in the current composite catalogue.
In its orbital architecture around Kepler-487, Kepler-487 b completes one full revolution every 15.359 Earth days at a semi-major axis of 0.11819 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 83.7 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 662 K (+389°C / +732°F) and receiving 51.49 S⊕ (~70,081 W/m²), Kepler-487 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-487 is classified as a stellar host with an effective photospheric temperature of 5,444 K, a radius of 0.88 R☉, a mass of 0.91 M☉, an estimated bolometric luminosity of 0.61 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.62 Gyr and a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, Kepler-487 shines at apparent V-band magnitude 14.882 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-487 system is a multi-planet architecture hosting 3 confirmed worlds, with Kepler-487 b sharing its stellar neighborhood alongside Kepler-487 d, Kepler-487 c.
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 | Kepler-487 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,444 K |
| Stellar Radius | 0.8800 R☉ |
| Stellar Mass | 0.9100 M☉ |
| Bolometric Luminosity | 0.61 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | 5.620 Gyr |
| Apparent Magnitude | V: 14.882 · G: 15.065 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.118190 AU |
| Orbital Period | 15.359 days |
| Mean Orbital Velocity | 83.7 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.0200° |
| Insolation Flux | 51.4920 S⊕ (~70,081 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2845.200 LY (872.343 pc) |