Kepler-60 d
Astrophysical Synthesis & Habitability Characterization
Kepler-60 d is a confirmed super-earth exoplanet orbiting the star Kepler-60, located approximately 3343.4 light-years (1025.1 parsecs) from the Solar System. First announced in 2012 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0211% across the stellar disk), this world measures 1.99 Earth radii and has a measured mass of 4.16 Earth masses. Combining its mass and radius yields a mean bulk density of 2.91 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 16.2 km/s.
In its orbital architecture around Kepler-60, Kepler-60 d completes one full revolution every 11.898 Earth days at a semi-major axis of 0.10203 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 93.3 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.002 (ranging from 0.1018 AU at periapsis to 0.1022 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 929 K (+656°C / +1213°F) and receiving 161.00 S⊕ (~219,121 W/m²), Kepler-60 d orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-60 is classified as a stellar host with an effective photospheric temperature of 5,905 K, a radius of 1.257 R☉, a mass of 1.041 M☉, an estimated bolometric luminosity of 1.724 L☉. Stellar evolution modeling indicates an estimated stellar age of 8.91 Gyr and a metallicity of [Fe/H] = -0.09 dex (near-solar heavy-element abundance). From Earth, Kepler-60 shines at apparent V-band magnitude 13.95 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-60 system is a multi-planet architecture hosting 3 confirmed worlds, with Kepler-60 d sharing its stellar neighborhood alongside Kepler-60 b, Kepler-60 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-60 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,905 K |
| Stellar Radius | 1.2570 R☉ |
| Stellar Mass | 1.0410 M☉ |
| Bolometric Luminosity | 1.724 L☉ |
| Metallicity [Fe/H] | -0.090 dex |
| Stellar Age | 8.910 Gyr |
| Apparent Magnitude | V: 13.950 · G: 13.913 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.102030 AU |
| Orbital Period | 11.898 days |
| Mean Orbital Velocity | 93.3 km/s |
| Orbital Eccentricity (e) | 0.00200 |
| Orbital Inclination (i) | 87.2100° |
| Mean Bulk Density | 2.91 g/cm³ (16.2 km/s vesc) |
| Insolation Flux | 161.0000 S⊕ (~219,121 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3343.400 LY (1025.100 pc) |