Kepler-1653 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1653 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1653, located approximately 2462.5 light-years (755 parsecs) from the Solar System. First announced in 2017 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0824% across the stellar disk), this world measures 2.17 Earth radii and has a measured mass of 5.35 Earth masses. Combining its mass and radius yields a mean bulk density of 2.89 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 17.6 km/s.
In its orbital architecture around Kepler-1653, Kepler-1653 b completes one full revolution every 140.252 Earth days at a semi-major axis of 0.4706 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 36.5 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.
✓ Classified as a Temperate Habitable Zone Candidate.
With an estimated equilibrium temperature of 284 K (+11°C / +52°F) and an incident stellar irradiance of 0.98 S⊕ (~1,334 W/m²), Kepler-1653 b orbits within the empirical circumstellar habitable zone where a rocky surface under sufficient atmospheric pressure can maintain liquid surface water.
The host star Kepler-1653 is classified as a stellar host with an effective photospheric temperature of 4,807 K, a radius of 0.693 R☉, a mass of 0.719 M☉, an estimated bolometric luminosity of 0.23 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.7 Gyr and a metallicity of [Fe/H] = -0.18 dex (metal-poor relative to the Sun). From Earth, Kepler-1653 shines at apparent V-band magnitude 15.864 (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-1653 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,807 K |
| Stellar Radius | 0.6930 R☉ |
| Stellar Mass | 0.7190 M☉ |
| Bolometric Luminosity | 0.23 L☉ |
| Metallicity [Fe/H] | -0.180 dex |
| Stellar Age | 7.700 Gyr |
| Apparent Magnitude | V: 15.864 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.470600 AU |
| Orbital Period | 140.252 days |
| Mean Orbital Velocity | 36.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.7880° |
| Mean Bulk Density | 2.89 g/cm³ (17.6 km/s vesc) |
| Insolation Flux | 0.9800 S⊕ (~1,334 W/m²) |
| Habitable Zone Status | ★ Temperate Zone |
| Celestial Distance | 2462.500 LY (755.000 pc) |