Kepler-607 c
Astrophysical Synthesis & Habitability Characterization
Kepler-607 c is a confirmed sub-neptune exoplanet orbiting the star Kepler-607, located approximately 1693.1 light-years (519.12 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0812% across the stellar disk), this world measures 2.76 Earth radii and has a measured mass of 8.05 Earth masses. Combining its mass and radius yields a mean bulk density of 2.11 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.06 g⊕ (10.4 m/s²), and an escape velocity of 19.1 km/s.
In its orbital architecture around Kepler-607, Kepler-607 c completes one full revolution every 39.677 Earth days at a semi-major axis of 0.21507 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 59 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 473 K (+200°C / +392°F) and receiving 8.80 S⊕ (~11,977 W/m²), Kepler-607 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-607 is classified as a stellar host with an effective photospheric temperature of 5,244 K, a radius of 0.888 R☉, a mass of 0.808 M☉, an estimated bolometric luminosity of 0.535 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.76 Gyr and a metallicity of [Fe/H] = 0.02 dex (near-solar heavy-element abundance). From Earth, Kepler-607 shines at apparent V-band magnitude 14.672 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-607 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-607 c sharing its stellar neighborhood alongside Kepler-607 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-607 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,244 K |
| Stellar Radius | 0.8880 R☉ |
| Stellar Mass | 0.8080 M☉ |
| Bolometric Luminosity | 0.535 L☉ |
| Metallicity [Fe/H] | 0.020 dex |
| Stellar Age | 7.760 Gyr |
| Apparent Magnitude | V: 14.672 · G: 14.375 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.215070 AU |
| Orbital Period | 39.677 days |
| Mean Orbital Velocity | 59 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.2400° |
| Mean Bulk Density | 2.11 g/cm³ (19.1 km/s vesc) |
| Insolation Flux | 8.8000 S⊕ (~11,977 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1693.100 LY (519.122 pc) |