Kepler-1127 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1127 b is a confirmed super-earth exoplanet orbiting the star Kepler-1127, located approximately 2747.7 light-years (842.46 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0358% across the stellar disk), this world measures 1.96 Earth radii and has a measured mass of 4.5 Earth masses. Combining its mass and radius yields a mean bulk density of 3.3 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.17 g⊕ (11.47 m/s²), and an escape velocity of 16.9 km/s.
In its orbital architecture around Kepler-1127, Kepler-1127 b completes one full revolution every 5.123 Earth days at a semi-major axis of 0.0556 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 118.1 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 994 K (+721°C / +1330°F) and receiving 160.77 S⊕ (~218,801 W/m²), Kepler-1127 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1127 is classified as a stellar host with an effective photospheric temperature of 5,664 K, a radius of 0.95 R☉, a mass of 0.97 M☉, an estimated bolometric luminosity of 0.833 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.37 Gyr and a metallicity of [Fe/H] = 0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-1127 shines at apparent V-band magnitude 15.162 (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-1127 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,664 K |
| Stellar Radius | 0.9500 R☉ |
| Stellar Mass | 0.9700 M☉ |
| Bolometric Luminosity | 0.833 L☉ |
| Metallicity [Fe/H] | 0.040 dex |
| Stellar Age | 4.370 Gyr |
| Apparent Magnitude | V: 15.162 · G: 15.133 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.055600 AU |
| Orbital Period | 5.123 days |
| Mean Orbital Velocity | 118.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.7200° |
| Mean Bulk Density | 3.3 g/cm³ (16.9 km/s vesc) |
| Insolation Flux | 160.7650 S⊕ (~218,801 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2747.700 LY (842.459 pc) |