Kepler-1704 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1704 b is a confirmed gas giant exoplanet orbiting the star Kepler-1704, located approximately 2724.9 light-years (835.46 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.4167% across the stellar disk), this world measures 11.949 Earth radii (1.07 Jupiter radii) and has a measured mass of 1322.166 Earth masses (4.16 Jupiter masses). Combining its mass and radius yields a mean bulk density of 4.27 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 9.26 g⊕ (90.81 m/s²), and an escape velocity of 117.7 km/s.
In its orbital architecture around Kepler-1704, Kepler-1704 b completes one full revolution every 988.881 Earth days (2.71Julian years) at a semi-major axis of 2.027 AU (corresponding to the middle-system regime between Mars at 1.52 AU and Jupiter at 5.20 AU). Its mean orbital velocity is approximately 22.3 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.92, swinging from 0.1622 AU at periapsis out to 3.8918 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 11.949 R⊕, Kepler-1704 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star Kepler-1704 is classified as a stellar host with an effective photospheric temperature of 5,746 K, a radius of 1.697 R☉, a mass of 1.132 M☉, an estimated bolometric luminosity of 2.817 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.4 Gyr and a metallicity of [Fe/H] = 0.196 dex (metal-rich relative to the Sun). From Earth, Kepler-1704 shines at apparent V-band magnitude 13.392 (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-1704 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,746 K |
| Stellar Radius | 1.6970 R☉ |
| Stellar Mass | 1.1320 M☉ |
| Bolometric Luminosity | 2.817 L☉ |
| Metallicity [Fe/H] | 0.196 dex |
| Stellar Age | 7.400 Gyr |
| Apparent Magnitude | V: 13.392 · G: 13.251 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2.027000 AU |
| Orbital Period | 988.881 days |
| Mean Orbital Velocity | 22.3 km/s |
| Orbital Eccentricity (e) | 0.92000 |
| Orbital Inclination (i) | 89.0000° |
| Mean Bulk Density | 4.27 g/cm³ (117.7 km/s vesc) |
| Insolation Flux | 0.3420 S⊕ (~465 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2724.900 LY (835.455 pc) |