Kepler-1084 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1084 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1084, located approximately 1322.7 light-years (405.53 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0063% across the stellar disk), this world measures 1.11 Earth radii and has a measured mass of 1.41 Earth masses. Combining its mass and radius yields a mean bulk density of 5.68 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.14 g⊕ (11.18 m/s²), and an escape velocity of 12.6 km/s.
In its orbital architecture around Kepler-1084, Kepler-1084 b completes one full revolution every 2.053 Earth days at a semi-major axis of 0.0324 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 171.7 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 1737 K (+1464°C / +2667°F) and receiving 1,766.59 S⊕ (~2,404,333 W/m²), Kepler-1084 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1084 is classified as a stellar host with an effective photospheric temperature of 6,113 K, a radius of 1.28 R☉, a mass of 1.12 M☉, an estimated bolometric luminosity of 2.053 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.07 Gyr and a metallicity of [Fe/H] = -0.02 dex (near-solar heavy-element abundance). From Earth, Kepler-1084 shines at apparent V-band magnitude 12.015 (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-1084 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,113 K |
| Stellar Radius | 1.2800 R☉ |
| Stellar Mass | 1.1200 M☉ |
| Bolometric Luminosity | 2.053 L☉ |
| Metallicity [Fe/H] | -0.020 dex |
| Stellar Age | 4.070 Gyr |
| Apparent Magnitude | V: 12.015 · G: 12.158 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.032400 AU |
| Orbital Period | 2.053 days |
| Mean Orbital Velocity | 171.7 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 61.5000° |
| Mean Bulk Density | 5.68 g/cm³ (12.6 km/s vesc) |
| Insolation Flux | 1766.5930 S⊕ (~2,404,333 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1322.700 LY (405.533 pc) |