Kepler-1827 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1827 b is a confirmed super-earth exoplanet orbiting the star Kepler-1827, located approximately 2238.9 light-years (686.46 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0147% across the stellar disk), this world measures 1.856 Earth radii and has a measured mass of 4.1 Earth masses. Combining its mass and radius yields a mean bulk density of 3.54 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.19 g⊕ (11.67 m/s²), and an escape velocity of 16.6 km/s.
In its orbital architecture around Kepler-1827, Kepler-1827 b completes one full revolution every 3.701 Earth days at a semi-major axis of 0.04647 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 136.6 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 1329 K (+1056°C / +1933°F) and receiving 1,113.40 S⊕ (~1,515,337 W/m²), Kepler-1827 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1827 is classified as a stellar host with an effective photospheric temperature of 5,423 K, a radius of 1.404 R☉, a mass of 0.915 M☉, an estimated bolometric luminosity of 1.53 L☉. Stellar evolution modeling indicates an estimated stellar age of 10.96 Gyr and a metallicity of [Fe/H] = 0.08 dex (metal-rich relative to the Sun). From Earth, Kepler-1827 shines at apparent V-band magnitude 13.228 (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-1827 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,423 K |
| Stellar Radius | 1.4040 R☉ |
| Stellar Mass | 0.9150 M☉ |
| Bolometric Luminosity | 1.53 L☉ |
| Metallicity [Fe/H] | 0.080 dex |
| Stellar Age | 10.960 Gyr |
| Apparent Magnitude | V: 13.228 · G: 13.006 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.046470 AU |
| Orbital Period | 3.701 days |
| Mean Orbital Velocity | 136.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 79.3100° |
| Mean Bulk Density | 3.54 g/cm³ (16.6 km/s vesc) |
| Insolation Flux | 1113.4000 S⊕ (~1,515,337 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2238.900 LY (686.461 pc) |