Kepler-1737 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1737 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1737. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.3152% across the stellar disk), this world measures 5.395 Earth radii (0.48 Jupiter radii) and has a measured mass of 25.1 Earth masses. Combining its mass and radius yields a mean bulk density of 0.88 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.86 g⊕ (8.43 m/s²), and an escape velocity of 24.1 km/s.
In its orbital architecture around Kepler-1737, Kepler-1737 b completes one full revolution every 64.618 Earth days at a semi-major axis of 0.297 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 50 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 383 K (+110°C / +230°F) and receiving 5.09 S⊕ (~6,927 W/m²), Kepler-1737 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1737 is classified as a stellar host with an effective photospheric temperature of 5,043 K, a radius of 0.881 R☉, a mass of 0.834 M☉, an estimated bolometric luminosity of 0.45 L☉. Stellar evolution modeling indicates an estimated stellar age of 13.7 Gyr and a metallicity of [Fe/H] = 0.3 dex (metal-rich relative to the Sun). From Earth, Kepler-1737 shines at apparent V-band magnitude 15.498 (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-1737 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,043 K |
| Stellar Radius | 0.8810 R☉ |
| Stellar Mass | 0.8340 M☉ |
| Bolometric Luminosity | 0.45 L☉ |
| Metallicity [Fe/H] | 0.300 dex |
| Stellar Age | 13.700 Gyr |
| Apparent Magnitude | V: 15.498 · G: 15.374 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.297000 AU |
| Orbital Period | 64.618 days |
| Mean Orbital Velocity | 50 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.9000° |
| Mean Bulk Density | 0.88 g/cm³ (24.1 km/s vesc) |
| Insolation Flux | 5.0900 S⊕ (~6,927 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | — |