Kepler-1630 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1630 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1630, located approximately 1080.3 light-years (331.21 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.1016% across the stellar disk), this world measures 2.19 Earth radii and has a measured mass of 5.43 Earth masses. Combining its mass and radius yields a mean bulk density of 2.85 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.13 g⊕ (11.08 m/s²), and an escape velocity of 17.6 km/s.

In its orbital architecture around Kepler-1630, Kepler-1630 b completes one full revolution every 509.997 Earth days (1.4Julian years) at a semi-major axis of 1.1218 AU (comparable to the inner terrestrial zone between Venus, Earth at 1.00 AU, and Mars at 1.52 AU). Its mean orbital velocity is approximately 23.9 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.

ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for Kepler-1630 b place it outside the conservative habitable zone definition pending further atmospheric characterization.

The host star Kepler-1630 is classified as a stellar host with an effective photospheric temperature of 4,736 K, a radius of 0.63 R☉, a mass of 0.66 M☉, an estimated bolometric luminosity of 0.179 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.01 Gyr and a metallicity of [Fe/H] = -0.46 dex (metal-poor relative to the Sun). From Earth, Kepler-1630 shines at apparent V-band magnitude 14.278 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

Discovery Facility: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).