Kepler-1489 c
Astrophysical Synthesis & Habitability Characterization
Kepler-1489 c is a confirmed sub-earth exoplanet orbiting the star Kepler-1489, located approximately 4184.7 light-years (1283.05 parsecs) from the Solar System. First announced in 2024 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0024% across the stellar disk), this world measures 0.51 Earth radii and has a measured mass of 0.087 Earth masses. Combining its mass and radius yields a mean bulk density of 3.62 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 0.33 g⊕ (3.24 m/s²), and an escape velocity of 4.6 km/s.
In its orbital architecture around Kepler-1489, Kepler-1489 c completes one full revolution every 0.681 Earth days.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for Kepler-1489 c place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star Kepler-1489 is classified as a solar-type yellow star of spectral type G with an effective photospheric temperature of 5,566 K, a radius of 0.957 R☉, a mass of 0.977 M☉, an estimated bolometric luminosity of 0.789 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.07 Gyr and a metallicity of [Fe/H] = 0.14 dex (metal-rich 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 c sharing its stellar neighborhood alongside Kepler-1489 b.
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) | 5,566 K |
| Stellar Radius | 0.9570 R☉ |
| Stellar Mass | 0.9770 M☉ |
| Bolometric Luminosity | 0.789 L☉ |
| Metallicity [Fe/H] | 0.140 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) | — |
| Orbital Period | 0.681 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3.62 g/cm³ (4.6 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4184.700 LY (1283.050 pc) |