Kepler-755 c
Astrophysical Synthesis & Habitability Characterization
Kepler-755 c is a confirmed super-earth exoplanet orbiting the star Kepler-755, located approximately 1301.5 light-years (399.03 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0225% across the stellar disk), this world measures 1.26 Earth radii and has a measured mass of 2.13 Earth masses. Combining its mass and radius yields a mean bulk density of 5.87 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.34 g⊕ (13.14 m/s²), and an escape velocity of 14.5 km/s.
In its orbital architecture around Kepler-755, Kepler-755 c completes one full revolution every 2.853 Earth days at a semi-major axis of 0.037 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 141.1 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.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1016 K (+743°C / +1369°F) and receiving 302.57 S⊕ (~411,803 W/m²), Kepler-755 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-755 is classified as a stellar host with an effective photospheric temperature of 5,043 K, a radius of 0.77 R☉, a mass of 0.82 M☉, an estimated bolometric luminosity of 0.344 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.9 Gyr and a metallicity of [Fe/H] = -0.01 dex (near-solar heavy-element abundance). From Earth, Kepler-755 shines at apparent V-band magnitude 14.277 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-755 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-755 c sharing its stellar neighborhood alongside Kepler-755 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-755 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,043 K |
| Stellar Radius | 0.7700 R☉ |
| Stellar Mass | 0.8200 M☉ |
| Bolometric Luminosity | 0.344 L☉ |
| Metallicity [Fe/H] | -0.010 dex |
| Stellar Age | 4.900 Gyr |
| Apparent Magnitude | V: 14.277 · G: 14.024 |
| System Architecture | 2 Stars, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.037000 AU |
| Orbital Period | 2.853 days |
| Mean Orbital Velocity | 141.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.3700° |
| Mean Bulk Density | 5.87 g/cm³ (14.5 km/s vesc) |
| Insolation Flux | 302.5740 S⊕ (~411,803 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1301.500 LY (399.034 pc) |