Kepler-1980 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1980 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1980, located approximately 5575.3 light-years (1709.4 parsecs) from the Solar System. First announced in 2023 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0419% across the stellar disk), this world measures 2.21 Earth radii and has a measured mass of 5.52 Earth masses. Combining its mass and radius yields a mean bulk density of 2.82 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.13 g⊕ (11.08 m/s²), and an escape velocity of 17.7 km/s.
In its orbital architecture around Kepler-1980, Kepler-1980 b completes one full revolution every 33.026 Earth days at a semi-major axis of 0.2049 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 67.5 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 564 K (+291°C / +556°F) and receiving 23.95 S⊕ (~32,596 W/m²), Kepler-1980 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1980 is classified as a stellar host with an effective photospheric temperature of 5,819 K, a radius of 0.99 R☉, a mass of 1.049 M☉, an estimated bolometric luminosity of 1.008 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.14 dex (metal-rich relative to the Sun). From Earth, Kepler-1980 shines at apparent V-band magnitude 15.906 (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-1980 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,819 K |
| Stellar Radius | 0.9900 R☉ |
| Stellar Mass | 1.0490 M☉ |
| Bolometric Luminosity | 1.008 L☉ |
| Metallicity [Fe/H] | 0.140 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 15.906 · G: 15.569 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.204900 AU |
| Orbital Period | 33.026 days |
| Mean Orbital Velocity | 67.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9400° |
| Mean Bulk Density | 2.82 g/cm³ (17.7 km/s vesc) |
| Insolation Flux | 23.9500 S⊕ (~32,596 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 5575.300 LY (1709.400 pc) |