Kepler-1529 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1529 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1529, located approximately 2155.9 light-years (661.01 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0625% across the stellar disk), this world measures 2.1 Earth radii and has a measured mass of 5.06 Earth masses. Combining its mass and radius yields a mean bulk density of 3.01 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.15 g⊕ (11.28 m/s²), and an escape velocity of 17.4 km/s.
In its orbital architecture around Kepler-1529, Kepler-1529 b completes one full revolution every 5.339 Earth days at a semi-major axis of 0.0525 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 107 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 817 K (+544°C / +1011°F) and receiving 115.77 S⊕ (~157,556 W/m²), Kepler-1529 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1529 is classified as a stellar host with an effective photospheric temperature of 5,048 K, a radius of 0.77 R☉, a mass of 0.81 M☉, an estimated bolometric luminosity of 0.345 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.79 Gyr and a metallicity of [Fe/H] = -0.03 dex (near-solar heavy-element abundance). From Earth, Kepler-1529 shines at apparent V-band magnitude 15.297 (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-1529 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,048 K |
| Stellar Radius | 0.7700 R☉ |
| Stellar Mass | 0.8100 M☉ |
| Bolometric Luminosity | 0.345 L☉ |
| Metallicity [Fe/H] | -0.030 dex |
| Stellar Age | 4.790 Gyr |
| Apparent Magnitude | V: 15.297 · G: 15.389 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.052500 AU |
| Orbital Period | 5.339 days |
| Mean Orbital Velocity | 107 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9600° |
| Mean Bulk Density | 3.01 g/cm³ (17.4 km/s vesc) |
| Insolation Flux | 115.7650 S⊕ (~157,556 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2155.900 LY (661.014 pc) |