Kepler-1489 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1489 b is a confirmed super-earth exoplanet orbiting the star Kepler-1489, located approximately 4184.7 light-years (1283.05 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0325% across the stellar disk), this world measures 1.77 Earth radii and has a measured mass of 3.78 Earth masses. Combining its mass and radius yields a mean bulk density of 3.76 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.21 g⊕ (11.87 m/s²), and an escape velocity of 16.3 km/s.
In its orbital architecture around Kepler-1489, Kepler-1489 b completes one full revolution every 82.295 Earth days at a semi-major axis of 0.3679 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 48.6 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 400 K (+127°C / +261°F) and receiving 11.89 S⊕ (~16,186 W/m²), Kepler-1489 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1489 is classified as a solar-type yellow star of spectral type G with an effective photospheric temperature of 5,655 K, a radius of 0.9 R☉, a mass of 0.93 M☉, an estimated bolometric luminosity of 0.743 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.07 Gyr and a metallicity of [Fe/H] = -0.13 dex (metal-poor relative to the Sun). From Earth, Kepler-1489 shines at apparent V-band magnitude 14.983 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1489 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1489 b sharing its stellar neighborhood alongside Kepler-1489 c.
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-1489 |
| Spectral Type | G |
| Effective Temp (Teff) | 5,655 K |
| Stellar Radius | 0.9000 R☉ |
| Stellar Mass | 0.9300 M☉ |
| Bolometric Luminosity | 0.743 L☉ |
| Metallicity [Fe/H] | -0.130 dex |
| Stellar Age | 4.070 Gyr |
| Apparent Magnitude | V: 14.983 · G: 14.808 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.367900 AU |
| Orbital Period | 82.295 days |
| Mean Orbital Velocity | 48.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.8700° |
| Mean Bulk Density | 3.76 g/cm³ (16.3 km/s vesc) |
| Insolation Flux | 11.8930 S⊕ (~16,186 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4184.700 LY (1283.050 pc) |