Kepler-283 b
Astrophysical Synthesis & Habitability Characterization
Kepler-283 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-283, located approximately 1526.7 light-years (468.09 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.119% across the stellar disk), this world measures 2.13 Earth radii and has a measured mass of 5.18 Earth masses. Combining its mass and radius yields a mean bulk density of 2.96 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.14 g⊕ (11.18 m/s²), and an escape velocity of 17.4 km/s.
In its orbital architecture around Kepler-283, Kepler-283 b completes one full revolution every 11.008 Earth days at a semi-major axis of 0.082 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 81 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 488 K (+215°C / +419°F) and receiving 16.26 S⊕ (~22,130 W/m²), Kepler-283 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-283 is classified as a stellar host with an effective photospheric temperature of 4,351 K, a radius of 0.566 R☉, a mass of 0.596 M☉, an estimated bolometric luminosity of 0.103 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.09 Gyr and a metallicity of [Fe/H] = -0.17 dex (metal-poor relative to the Sun). From Earth, Kepler-283 shines at apparent V-band magnitude 16.216 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-283 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-283 b sharing its stellar neighborhood alongside Kepler-283 c.
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-283 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,351 K |
| Stellar Radius | 0.5660 R☉ |
| Stellar Mass | 0.5960 M☉ |
| Bolometric Luminosity | 0.103 L☉ |
| Metallicity [Fe/H] | -0.170 dex |
| Stellar Age | 3.090 Gyr |
| Apparent Magnitude | V: 16.216 · G: 15.875 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.082000 AU |
| Orbital Period | 11.008 days |
| Mean Orbital Velocity | 81 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9700° |
| Mean Bulk Density | 2.96 g/cm³ (17.4 km/s vesc) |
| Insolation Flux | 16.2600 S⊕ (~22,130 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1526.700 LY (468.094 pc) |