ZTF J1828+2308 b
Astrophysical Synthesis & Habitability Characterization
ZTF J1828+2308 b is a confirmed gas giant exoplanet orbiting the star ZTF J1828+2308, located approximately 658.3 light-years (201.83 parsecs) from the Solar System. First announced in 2025 by Zwicky Transient Facility using the Transit detection technique (producing an estimated primary transit depth of 6068.3045% across the stellar disk), this world measures 11.131 Earth radii (0.99 Jupiter radii) and has a measured mass of 6356.568 Earth masses (20 Jupiter masses). Combining its mass and radius yields a mean bulk density of 25.41 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 51.3 g⊕ (503.08 m/s²), and an escape velocity of 267.3 km/s.
In its orbital architecture around ZTF J1828+2308, ZTF J1828+2308 b completes one full revolution every 0.112 Earth days.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 11.131 R⊕, ZTF J1828+2308 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star ZTF J1828+2308 is classified as a stellar host with an effective photospheric temperature of 15,900 K, a radius of 0.0131 R☉, a mass of 0.61 M☉, an estimated bolometric luminosity of 0.00984 L☉. From Earth, ZTF J1828+2308 shines at apparent V-band magnitude 18.045 (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: Zwicky Transient Facility · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | ZTF J1828+2308 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 15,900 K |
| Stellar Radius | 0.0131 R☉ |
| Stellar Mass | 0.6100 M☉ |
| Bolometric Luminosity | 0.00984 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 18.045 · G: 18.026 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 0.112 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.9000° |
| Mean Bulk Density | 25.41 g/cm³ (267.3 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 658.300 LY (201.827 pc) |