Kepler-1705 c
Astrophysical Synthesis & Habitability Characterization
Kepler-1705 c is a confirmed sub-neptune exoplanet orbiting the star Kepler-1705, located approximately 5327.7 light-years (1633.49 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0223% across the stellar disk), this world measures 2.05 Earth radii and has a measured mass of 5.42 Earth masses. Combining its mass and radius yields a mean bulk density of 3.47 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.29 g⊕ (12.65 m/s²), and an escape velocity of 18.2 km/s.
In its orbital architecture around Kepler-1705, Kepler-1705 c completes one full revolution every 11.28 Earth days. With a near-circular eccentricity of e = 0.028, the planet experiences minimal orbital distance variation.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for Kepler-1705 c place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star Kepler-1705 is classified as a stellar host with an effective photospheric temperature of 6,312 K, a radius of 1.259 R☉, a mass of 1.139 M☉, an estimated bolometric luminosity of 2.257 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.59 Gyr and a metallicity of [Fe/H] = -0.2 dex (metal-poor relative to the Sun). From Earth, Kepler-1705 shines at apparent V-band magnitude 15.8 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1705 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1705 c sharing its stellar neighborhood alongside Kepler-1705 b.
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-1705 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,312 K |
| Stellar Radius | 1.2590 R☉ |
| Stellar Mass | 1.1390 M☉ |
| Bolometric Luminosity | 2.257 L☉ |
| Metallicity [Fe/H] | -0.200 dex |
| Stellar Age | 2.590 Gyr |
| Apparent Magnitude | V: 15.800 · G: 15.497 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 11.28 days |
| Orbital Eccentricity (e) | 0.02800 |
| Orbital Inclination (i) | 88.8900° |
| Mean Bulk Density | 3.47 g/cm³ (18.2 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 5327.700 LY (1633.490 pc) |