Kepler-1225 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1225 b is a confirmed super-earth exoplanet orbiting the star Kepler-1225, located approximately 4395 light-years (1347.52 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0197% across the stellar disk), this world measures 1.82 Earth radii and has a measured mass of 3.97 Earth masses. Combining its mass and radius yields a mean bulk density of 3.63 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.2 g⊕ (11.77 m/s²), and an escape velocity of 16.5 km/s.
In its orbital architecture around Kepler-1225, Kepler-1225 b completes one full revolution every 7.011 Earth days at a semi-major axis of 0.0771 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 119.6 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 1453 K (+1180°C / +2156°F) and receiving 324.28 S⊕ (~441,348 W/m²), Kepler-1225 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1225 is classified as a stellar host with an effective photospheric temperature of 6,140 K, a radius of 1.19 R☉, a mass of 1.13 M☉, an estimated bolometric luminosity of 1.806 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.02 Gyr and a metallicity of [Fe/H] = 0.01 dex (near-solar heavy-element abundance). From Earth, Kepler-1225 shines at apparent V-band magnitude 14.819 (faint and requiring research-grade or CCD telescopic photometry) 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-1225 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,140 K |
| Stellar Radius | 1.1900 R☉ |
| Stellar Mass | 1.1300 M☉ |
| Bolometric Luminosity | 1.806 L☉ |
| Metallicity [Fe/H] | 0.010 dex |
| Stellar Age | 3.020 Gyr |
| Apparent Magnitude | V: 14.819 · G: 14.632 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.077100 AU |
| Orbital Period | 7.011 days |
| Mean Orbital Velocity | 119.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.9200° |
| Mean Bulk Density | 3.63 g/cm³ (16.5 km/s vesc) |
| Insolation Flux | 324.2820 S⊕ (~441,348 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4395.000 LY (1347.520 pc) |