Kepler-1849 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1849 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1849, located approximately 2060.9 light-years (631.88 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0901% across the stellar disk), this world measures 2.387 Earth radii and has a measured mass of 6.29 Earth masses. Combining its mass and radius yields a mean bulk density of 2.55 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.1 g⊕ (10.79 m/s²), and an escape velocity of 18.2 km/s.
In its orbital architecture around Kepler-1849, Kepler-1849 b completes one full revolution every 57.293 Earth days at a semi-major axis of 0.2597 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 49.3 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 355 K (+82°C / +180°F) and receiving 3.76 S⊕ (~5,117 W/m²), Kepler-1849 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1849 is classified as a stellar host with an effective photospheric temperature of 4,806 K, a radius of 0.729 R☉, a mass of 0.709 M☉, an estimated bolometric luminosity of 0.254 L☉. Stellar evolution modeling indicates an estimated stellar age of 13.5 Gyr and a metallicity of [Fe/H] = -0.1 dex (near-solar heavy-element abundance). From Earth, Kepler-1849 shines at apparent V-band magnitude 15.997 (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-1849 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,806 K |
| Stellar Radius | 0.7290 R☉ |
| Stellar Mass | 0.7090 M☉ |
| Bolometric Luminosity | 0.254 L☉ |
| Metallicity [Fe/H] | -0.100 dex |
| Stellar Age | 13.500 Gyr |
| Apparent Magnitude | V: 15.997 · G: 15.700 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.259700 AU |
| Orbital Period | 57.293 days |
| Mean Orbital Velocity | 49.3 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9900° |
| Mean Bulk Density | 2.55 g/cm³ (18.2 km/s vesc) |
| Insolation Flux | 3.7600 S⊕ (~5,117 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2060.900 LY (631.884 pc) |