Kepler-1350 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1350 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1350, located approximately 1111.2 light-years (340.69 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.19% across the stellar disk), this world measures 2.52 Earth radii and has a measured mass of 6.9 Earth masses. Combining its mass and radius yields a mean bulk density of 2.38 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.09 g⊕ (10.69 m/s²), and an escape velocity of 18.5 km/s.
In its orbital architecture around Kepler-1350, Kepler-1350 b completes one full revolution every 4.497 Earth days at a semi-major axis of 0.0413 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 99.9 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 535 K (+262°C / +504°F) and receiving 27.18 S⊕ (~36,987 W/m²), Kepler-1350 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1350 is classified as a stellar host with an effective photospheric temperature of 3,827 K, a radius of 0.53 R☉, a mass of 0.55 M☉, an estimated bolometric luminosity of 0.054 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.57 Gyr and a metallicity of [Fe/H] = -0.06 dex (near-solar heavy-element abundance). From Earth, Kepler-1350 shines at apparent V-band magnitude 16.577 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1350 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1350 b sharing its stellar neighborhood alongside Kepler-1350 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-1350 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,827 K |
| Stellar Radius | 0.5300 R☉ |
| Stellar Mass | 0.5500 M☉ |
| Bolometric Luminosity | 0.054 L☉ |
| Metallicity [Fe/H] | -0.060 dex |
| Stellar Age | 4.570 Gyr |
| Apparent Magnitude | V: 16.577 · G: 16.233 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.041300 AU |
| Orbital Period | 4.497 days |
| Mean Orbital Velocity | 99.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9500° |
| Mean Bulk Density | 2.38 g/cm³ (18.5 km/s vesc) |
| Insolation Flux | 27.1760 S⊕ (~36,987 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1111.200 LY (340.691 pc) |