Kepler-274 c
Astrophysical Synthesis & Habitability Characterization
Kepler-274 c is a confirmed super-earth exoplanet orbiting the star Kepler-274, located approximately 4349.7 light-years (1333.62 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0281% across the stellar disk), this world measures 1.84 Earth radii and has a measured mass of 4.04 Earth masses. Combining its mass and radius yields a mean bulk density of 3.58 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.19 g⊕ (11.67 m/s²), and an escape velocity of 16.6 km/s.
In its orbital architecture around Kepler-274, Kepler-274 c completes one full revolution every 33.198 Earth days at a semi-major axis of 0.204 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 66.9 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 678 K (+405°C / +761°F) and receiving 36.52 S⊕ (~49,701 W/m²), Kepler-274 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-274 is classified as a stellar host with an effective photospheric temperature of 6,023 K, a radius of 1.007 R☉, a mass of 0.883 M☉, an estimated bolometric luminosity of 1.197 L☉. Stellar evolution modeling indicates an estimated stellar age of 12.88 Gyr and a metallicity of [Fe/H] = -0.211 dex (metal-poor relative to the Sun). From Earth, Kepler-274 shines at apparent V-band magnitude 15.238 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-274 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-274 c sharing its stellar neighborhood alongside Kepler-274 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-274 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,023 K |
| Stellar Radius | 1.0070 R☉ |
| Stellar Mass | 0.8830 M☉ |
| Bolometric Luminosity | 1.197 L☉ |
| Metallicity [Fe/H] | -0.211 dex |
| Stellar Age | 12.880 Gyr |
| Apparent Magnitude | V: 15.238 · G: 15.032 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.204000 AU |
| Orbital Period | 33.198 days |
| Mean Orbital Velocity | 66.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.5300° |
| Mean Bulk Density | 3.58 g/cm³ (16.6 km/s vesc) |
| Insolation Flux | 36.5180 S⊕ (~49,701 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4349.700 LY (1333.620 pc) |