Kepler-1184 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1184 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1184, located approximately 3776.4 light-years (1157.84 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0527% across the stellar disk), this world measures 2.68 Earth radii and has a measured mass of 7.65 Earth masses. Combining its mass and radius yields a mean bulk density of 2.19 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.07 g⊕ (10.49 m/s²), and an escape velocity of 18.9 km/s.
In its orbital architecture around Kepler-1184, Kepler-1184 b completes one full revolution every 53.599 Earth days at a semi-major axis of 0.2863 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 58.1 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.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 529 K (+256°C / +493°F) and receiving 18.04 S⊕ (~24,551 W/m²), Kepler-1184 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1184 is classified as a stellar host with an effective photospheric temperature of 5,983 K, a radius of 1.07 R☉, a mass of 1.05 M☉, an estimated bolometric luminosity of 1.316 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.55 Gyr and a metallicity of [Fe/H] = -0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-1184 shines at apparent V-band magnitude 14.99 (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-1184 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,983 K |
| Stellar Radius | 1.0700 R☉ |
| Stellar Mass | 1.0500 M☉ |
| Bolometric Luminosity | 1.316 L☉ |
| Metallicity [Fe/H] | -0.040 dex |
| Stellar Age | 3.550 Gyr |
| Apparent Magnitude | V: 14.990 · G: 14.931 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.286300 AU |
| Orbital Period | 53.599 days |
| Mean Orbital Velocity | 58.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.2000° |
| Mean Bulk Density | 2.19 g/cm³ (18.9 km/s vesc) |
| Insolation Flux | 18.0390 S⊕ (~24,551 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3776.400 LY (1157.840 pc) |