KOI-1599.01
Astrophysical Synthesis & Habitability Characterization
KOI-1599.01 is a confirmed super-earth exoplanet orbiting the star KOI-1599, located approximately 3690.9 light-years (1131.64 parsecs) from the Solar System. First announced in 2019 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0321% across the stellar disk), this world measures 1.9 Earth radii and has a measured mass of 4.6 Earth masses. Combining its mass and radius yields a mean bulk density of 3.7 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.27 g⊕ (12.45 m/s²), and an escape velocity of 17.4 km/s.
In its orbital architecture around KOI-1599, KOI-1599.01 completes one full revolution every 20.442 Earth days at a semi-major axis of 0.14728 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 78.4 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.014 (ranging from 0.1452 AU at periapsis to 0.1493 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 660 K (+387°C / +729°F) and receiving 44.80 S⊕ (~60,973 W/m²), KOI-1599.01 orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star KOI-1599 is classified as a stellar host with an effective photospheric temperature of 5,833 K, a radius of 0.972 R☉, a mass of 1.02 M☉, an estimated bolometric luminosity of 0.981 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.7 Gyr and a metallicity of [Fe/H] = 0.06 dex (metal-rich relative to the Sun). From Earth, KOI-1599 shines at apparent V-band magnitude 14.795 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The KOI-1599 system is a multi-planet architecture hosting 2 confirmed worlds, with KOI-1599.01 sharing its stellar neighborhood alongside KOI-1599.02.
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 | KOI-1599 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,833 K |
| Stellar Radius | 0.9720 R☉ |
| Stellar Mass | 1.0200 M☉ |
| Bolometric Luminosity | 0.981 L☉ |
| Metallicity [Fe/H] | 0.060 dex |
| Stellar Age | 4.700 Gyr |
| Apparent Magnitude | V: 14.795 · G: 14.854 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.147280 AU |
| Orbital Period | 20.442 days |
| Mean Orbital Velocity | 78.4 km/s |
| Orbital Eccentricity (e) | 0.01400 |
| Orbital Inclination (i) | 89.7800° |
| Mean Bulk Density | 3.7 g/cm³ (17.4 km/s vesc) |
| Insolation Flux | 44.8000 S⊕ (~60,973 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3690.900 LY (1131.640 pc) |