KOI-2513.01
Astrophysical Synthesis & Habitability Characterization
KOI-2513.01 is a confirmed sub-neptune exoplanet orbiting the star KOI-2513, located approximately 4467.9 light-years (1369.87 parsecs) from the Solar System. First announced in 2023 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0458% across the stellar disk), this world measures 2.802 Earth radii and has a measured mass of 7310.053 Earth masses (23 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1832.24 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 931.07 g⊕ (9130.68 m/s²), and an escape velocity of 571.3 km/s.
In its orbital architecture around KOI-2513, KOI-2513.01 completes one full revolution every 19.005 Earth days at a semi-major axis of 0.5 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 286.2 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.36, swinging from 0.32 AU at periapsis out to 0.68 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 758 K (+485°C / +905°F) and receiving 78.19 S⊕ (~106,417 W/m²), KOI-2513.01 orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star KOI-2513 is classified as a stellar host with an effective photospheric temperature of 5,900 K, a radius of 1.2 R☉, a mass of 0.91 M☉, an estimated bolometric luminosity of 1.566 L☉. Stellar evolution modeling indicates an estimated stellar age of 8 Gyr and a metallicity of [Fe/H] = -0.37 dex (metal-poor relative to the Sun). From Earth, KOI-2513 shines at apparent V-band magnitude 14.913 (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 | KOI-2513 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,900 K |
| Stellar Radius | 1.2000 R☉ |
| Stellar Mass | 0.9100 M☉ |
| Bolometric Luminosity | 1.566 L☉ |
| Metallicity [Fe/H] | -0.370 dex |
| Stellar Age | 8.000 Gyr |
| Apparent Magnitude | V: 14.913 · G: 14.809 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.500000 AU |
| Orbital Period | 19.005 days |
| Mean Orbital Velocity | 286.2 km/s |
| Orbital Eccentricity (e) | 0.36000 |
| Orbital Inclination (i) | 89.7000° |
| Mean Bulk Density | 1832.24 g/cm³ (571.3 km/s vesc) |
| Insolation Flux | 78.1900 S⊕ (~106,417 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4467.900 LY (1369.870 pc) |