TOI-1269 c
Astrophysical Synthesis & Habitability Characterization
TOI-1269 c is a confirmed sub-neptune exoplanet orbiting the star TOI-1269, located approximately 561.4 light-years (172.14 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.058% across the stellar disk), this world measures 2.23 Earth radii and has a measured mass of 5.6 Earth masses. Combining its mass and radius yields a mean bulk density of 2.78 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.13 g⊕ (11.08 m/s²), and an escape velocity of 17.7 km/s.
In its orbital architecture around TOI-1269, TOI-1269 c completes one full revolution every 9.238 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 757 K (+484°C / +903°F) and receiving 54.68 S⊕ (~74,415 W/m²), TOI-1269 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1269 is classified as a stellar host with an effective photospheric temperature of 5,554 K, a radius of 0.8489 R☉, a mass of 0.9027 M☉, an estimated bolometric luminosity of 0.615 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.1 Gyr and a metallicity of [Fe/H] = -0.049 dex (near-solar heavy-element abundance). From Earth, TOI-1269 shines at apparent V-band magnitude 11.618 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-1269 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-1269 c sharing its stellar neighborhood alongside TOI-1269 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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TOI-1269 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,554 K |
| Stellar Radius | 0.8489 R☉ |
| Stellar Mass | 0.9027 M☉ |
| Bolometric Luminosity | 0.615 L☉ |
| Metallicity [Fe/H] | -0.049 dex |
| Stellar Age | 3.100 Gyr |
| Apparent Magnitude | V: 11.618 · G: 11.471 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 9.238 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.7461° |
| Mean Bulk Density | 2.78 g/cm³ (17.7 km/s vesc) |
| Insolation Flux | 54.6767 S⊕ (~74,415 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 561.400 LY (172.138 pc) |