Kepler-410 A b
Astrophysical Synthesis & Habitability Characterization
Kepler-410 A b is a confirmed sub-neptune exoplanet orbiting the star Kepler-410 A, located approximately 481.2 light-years (147.53 parsecs) from the Solar System. First announced in 2013 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.037% across the stellar disk), this world measures 2.838 Earth radii and has a measured mass of 8.44 Earth masses. Combining its mass and radius yields a mean bulk density of 2.04 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.05 g⊕ (10.3 m/s²), and an escape velocity of 19.3 km/s.
In its orbital architecture around Kepler-410 A, Kepler-410 A b completes one full revolution every 17.834 Earth days at a semi-major axis of 0.1226 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 74.8 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.17 carries the world between 0.1018 AU at periapsis and 0.1434 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 866 K (+593°C / +1099°F) and receiving 159.50 S⊕ (~217,080 W/m²), Kepler-410 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-410 A is classified as a stellar host with an effective photospheric temperature of 6,273 K, a radius of 1.352 R☉, a mass of 1.214 M☉, an estimated bolometric luminosity of 2.539 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.76 Gyr and a metallicity of [Fe/H] = 0.01 dex (near-solar heavy-element abundance). From Earth, Kepler-410 A shines at apparent V-band magnitude 9.495 (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: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | Kepler-410 A |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,273 K |
| Stellar Radius | 1.3520 R☉ |
| Stellar Mass | 1.2140 M☉ |
| Bolometric Luminosity | 2.539 L☉ |
| Metallicity [Fe/H] | 0.010 dex |
| Stellar Age | 2.760 Gyr |
| Apparent Magnitude | V: 9.495 · G: 9.375 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.122600 AU |
| Orbital Period | 17.834 days |
| Mean Orbital Velocity | 74.8 km/s |
| Orbital Eccentricity (e) | 0.17000 |
| Orbital Inclination (i) | 87.7200° |
| Mean Bulk Density | 2.04 g/cm³ (19.3 km/s vesc) |
| Insolation Flux | 159.5000 S⊕ (~217,080 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 481.200 LY (147.527 pc) |