TIC 18942729 b
Astrophysical Synthesis & Habitability Characterization
TIC 18942729 b is a confirmed sub-neptune exoplanet orbiting the star TIC 18942729, located approximately 375.6 light-years (115.17 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 0.0494% across the stellar disk), this world measures 2 Earth radii and has a measured mass of 4.66 Earth masses. Combining its mass and radius yields a mean bulk density of 3.21 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.17 g⊕ (11.47 m/s²), and an escape velocity of 17.1 km/s.
In its orbital architecture around TIC 18942729, TIC 18942729 b completes one full revolution every 0.998 Earth days.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for TIC 18942729 b place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star TIC 18942729 is classified as a stellar host with an effective photospheric temperature of 4,360 K, a radius of 0.8253 R☉, a mass of 0.652 M☉, an estimated bolometric luminosity of 0.221 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.012 dex (near-solar heavy-element abundance). From Earth, TIC 18942729 shines at apparent V-band magnitude 12.545 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
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 | TIC 18942729 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,360 K |
| Stellar Radius | 0.8253 R☉ |
| Stellar Mass | 0.6520 M☉ |
| Bolometric Luminosity | 0.221 L☉ |
| Metallicity [Fe/H] | 0.012 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 12.545 · G: 12.278 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 0.998 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 85.2341° |
| Mean Bulk Density | 3.21 g/cm³ (17.1 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 375.600 LY (115.169 pc) |