Kepler-610 c
Astrophysical Synthesis & Habitability Characterization
Kepler-610 c is a confirmed sub-neptune exoplanet orbiting the star Kepler-610, located approximately 2758.7 light-years (845.82 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0717% across the stellar disk), this world measures 3.3 Earth radii (0.29 Jupiter radii) and has a measured mass of 10.9 Earth masses. Combining its mass and radius yields a mean bulk density of 1.67 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1 g⊕ (9.81 m/s²), and an escape velocity of 20.3 km/s.
In its orbital architecture around Kepler-610, Kepler-610 c completes one full revolution every 151.864 Earth days at a semi-major axis of 0.5594 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 40.1 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.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 3.300 R⊕, Kepler-610 c 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 Kepler-610 is classified as a stellar host with an effective photospheric temperature of 5,943 K, a radius of 1.13 R☉, a mass of 1.1 M☉, an estimated bolometric luminosity of 1.429 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.55 Gyr and a metallicity of [Fe/H] = 0.12 dex (metal-rich relative to the Sun). From Earth, Kepler-610 shines at apparent V-band magnitude 14.816 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-610 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-610 c sharing its stellar neighborhood alongside Kepler-610 b.
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-610 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,943 K |
| Stellar Radius | 1.1300 R☉ |
| Stellar Mass | 1.1000 M☉ |
| Bolometric Luminosity | 1.429 L☉ |
| Metallicity [Fe/H] | 0.120 dex |
| Stellar Age | 3.550 Gyr |
| Apparent Magnitude | V: 14.816 · G: 14.770 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.559400 AU |
| Orbital Period | 151.864 days |
| Mean Orbital Velocity | 40.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9900° |
| Mean Bulk Density | 1.67 g/cm³ (20.3 km/s vesc) |
| Insolation Flux | 2.2970 S⊕ (~3,126 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2758.700 LY (845.824 pc) |