PSR J1719-1438 b

Astrophysical Synthesis & Habitability Characterization

PSR J1719-1438 b is a confirmed gas giant exoplanet orbiting the star PSR J1719-1438, located approximately 3913.9 light-years (1200 parsecs) from the Solar System. First announced in 2011 by Parkes Observatory using the Pulsar Timing detection technique, this world has a minimum or true mass of 382.8 Earth masses (1.2 M♃), while its physical transit radius has not yet been geometrically observed.

In its orbital architecture around PSR J1719-1438, PSR J1719-1438 b completes one full revolution every 0.091 Earth days at a semi-major axis of 0.0044 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 527.7 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.06 carries the world between 0.0041 AU at periapsis and 0.0047 AU at apoapsis, driving measurable seasonal insolation cycles.

ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for PSR J1719-1438 b place it outside the conservative habitable zone definition pending further atmospheric characterization.

The host star PSR J1719-1438 is classified as a stellar host with an effective photospheric temperature of 4,500 K, a mass of 1.4 M☉. Stellar evolution modeling indicates an estimated stellar age of 12.5 Gyr.

Discovery Facility: Parkes Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).