Kepler-880 c
Astrophysical Synthesis & Habitability Characterization
Kepler-880 c is a confirmed sub-neptune exoplanet orbiting the star Kepler-880, located approximately 1961.3 light-years (601.32 parsecs) from the Solar System. First announced in 2023 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0102% across the stellar disk), this world measures 2.87 Earth radii and has a measured mass of 8.6 Earth masses. Combining its mass and radius yields a mean bulk density of 2.01 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.04 g⊕ (10.2 m/s²), and an escape velocity of 19.4 km/s.
In its orbital architecture around Kepler-880, Kepler-880 c completes one full revolution every 11.806 Earth days at a semi-major axis of 0.1216 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 112.1 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 1407 K (+1134°C / +2073°F) and receiving 926.72 S⊕ (~1,261,266 W/m²), Kepler-880 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-880 is classified as a stellar host with an effective photospheric temperature of 6,900 K, a radius of 2.599 R☉, a mass of 1.714 M☉, an estimated bolometric luminosity of 13.737 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.41 Gyr and a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, Kepler-880 shines at apparent V-band magnitude 11.845 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-880 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-880 c sharing its stellar neighborhood alongside Kepler-880 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-880 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,900 K |
| Stellar Radius | 2.5990 R☉ |
| Stellar Mass | 1.7140 M☉ |
| Bolometric Luminosity | 13.737 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | 1.410 Gyr |
| Apparent Magnitude | V: 11.845 · G: 11.964 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.121600 AU |
| Orbital Period | 11.806 days |
| Mean Orbital Velocity | 112.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 84.2800° |
| Mean Bulk Density | 2.01 g/cm³ (19.4 km/s vesc) |
| Insolation Flux | 926.7200 S⊕ (~1,261,266 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1961.300 LY (601.324 pc) |