Kepler-750 b
Astrophysical Synthesis & Habitability Characterization
Kepler-750 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-750, located approximately 4227 light-years (1296.02 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0524% across the stellar disk), this world measures 3.07 Earth radii (0.27 Jupiter radii) and has a measured mass of 9.64 Earth masses. Combining its mass and radius yields a mean bulk density of 1.84 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.02 g⊕ (10 m/s²), and an escape velocity of 19.8 km/s.
In its orbital architecture around Kepler-750, Kepler-750 b completes one full revolution every 9.429 Earth days at a semi-major axis of 0.08742 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 100.9 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 1163 K (+890°C / +1634°F) and receiving 255.74 S⊕ (~348,062 W/m²), Kepler-750 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-750 is classified as a stellar host with an effective photospheric temperature of 6,160 K, a radius of 1.23 R☉, a mass of 1.15 M☉, an estimated bolometric luminosity of 1.954 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.09 Gyr and a metallicity of [Fe/H] = 0.03 dex (near-solar heavy-element abundance). From Earth, Kepler-750 shines at apparent V-band magnitude 14.634 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-750 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-750 b sharing its stellar neighborhood alongside Kepler-750 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-750 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,160 K |
| Stellar Radius | 1.2300 R☉ |
| Stellar Mass | 1.1500 M☉ |
| Bolometric Luminosity | 1.954 L☉ |
| Metallicity [Fe/H] | 0.030 dex |
| Stellar Age | 3.090 Gyr |
| Apparent Magnitude | V: 14.634 · G: 14.467 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.087420 AU |
| Orbital Period | 9.429 days |
| Mean Orbital Velocity | 100.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9600° |
| Mean Bulk Density | 1.84 g/cm³ (19.8 km/s vesc) |
| Insolation Flux | 255.7400 S⊕ (~348,062 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4227.000 LY (1296.020 pc) |