Kepler-1755 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1755 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1755, located approximately 3204.1 light-years (982.38 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.3469% across the stellar disk), this world measures 5.917 Earth radii (0.53 Jupiter radii) and has a measured mass of 29.4 Earth masses. Combining its mass and radius yields a mean bulk density of 0.78 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.84 g⊕ (8.24 m/s²), and an escape velocity of 24.9 km/s.
In its orbital architecture around Kepler-1755, Kepler-1755 b completes one full revolution every 24.812 Earth days at a semi-major axis of 0.1668 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 73.1 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 631 K (+358°C / +676°F) and receiving 37.43 S⊕ (~50,942 W/m²), Kepler-1755 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1755 is classified as a stellar host with an effective photospheric temperature of 6,086 K, a radius of 0.921 R☉, a mass of 1.003 M☉, an estimated bolometric luminosity of 1.044 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.3 Gyr and a metallicity of [Fe/H] = -0.26 dex (metal-poor relative to the Sun). From Earth, Kepler-1755 shines at apparent V-band magnitude 14.544 (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-1755 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,086 K |
| Stellar Radius | 0.9210 R☉ |
| Stellar Mass | 1.0030 M☉ |
| Bolometric Luminosity | 1.044 L☉ |
| Metallicity [Fe/H] | -0.260 dex |
| Stellar Age | 0.300 Gyr |
| Apparent Magnitude | V: 14.544 · G: 14.386 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.166800 AU |
| Orbital Period | 24.812 days |
| Mean Orbital Velocity | 73.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9600° |
| Mean Bulk Density | 0.78 g/cm³ (24.9 km/s vesc) |
| Insolation Flux | 37.4300 S⊕ (~50,942 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3204.100 LY (982.383 pc) |