TOI-1064 c
Astrophysical Synthesis & Habitability Characterization
TOI-1064 c is a confirmed sub-neptune exoplanet orbiting the star TOI-1064, located approximately 222 light-years (68.07 parsecs) from the Solar System. First announced in 2022 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.1121% across the stellar disk), this world measures 2.651 Earth radii and has a measured mass of 2.5 Earth masses. Combining its mass and radius yields a mean bulk density of 0.74 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.36 g⊕ (3.53 m/s²), and an escape velocity of 10.9 km/s.
In its orbital architecture around TOI-1064, TOI-1064 c completes one full revolution every 12.227 Earth days at a semi-major axis of 0.09429 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 83.9 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.088 carries the world between 0.086 AU at periapsis and 0.1026 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 634 K (+361°C / +682°F) and receiving 26.80 S⊕ (~36,475 W/m²), TOI-1064 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1064 is classified as a stellar host with an effective photospheric temperature of 4,734 K, a radius of 0.726 R☉, a mass of 0.748 M☉, an estimated bolometric luminosity of 0.238 L☉. Stellar evolution modeling indicates an estimated stellar age of 9.4 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, TOI-1064 shines at apparent V-band magnitude 10.938 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TOI-1064 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-1064 c sharing its stellar neighborhood alongside TOI-1064 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-1064 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,734 K |
| Stellar Radius | 0.7260 R☉ |
| Stellar Mass | 0.7480 M☉ |
| Bolometric Luminosity | 0.238 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 9.400 Gyr |
| Apparent Magnitude | V: 10.938 · G: 10.649 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.094290 AU |
| Orbital Period | 12.227 days |
| Mean Orbital Velocity | 83.9 km/s |
| Orbital Eccentricity (e) | 0.08800 |
| Orbital Inclination (i) | 88.4550° |
| Mean Bulk Density | 0.74 g/cm³ (10.9 km/s vesc) |
| Insolation Flux | 26.8000 S⊕ (~36,475 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 222.000 LY (68.073 pc) |