PSR B1620-26 PSR B1620-26 PSR B1620-26 is a binary star system located at a distance of 3,800 parsecs (12,400 light-years) in the globular cluster of Messier 4 (M4, NGC 6121) in the constellation of Scorpius. The system is composed of a pulsar (PSR B1620-26 A) and a white dwarf star (WD B1620-26 or PSR B1620-26 B). As of 2000, the system is also confirmed to have an extrasolar planet orbiting the two stars. The double system ("triple" including the substellar companion) is just outside the core of the globular cluster. The age of the cluster has been estimated to be about 12.2
Messier 26 Messier 26 Messier 26, also known as NGC 6694, is an open cluster of stars in the southern constellation of Scutum. It was discovered by Charles Messier on June 20, 1764. This 8th magnitude cluster is a challenge to find with typical binoculars, but can be spotted with an 80mm aperture. It is positioned near the open cluster Messier 11 and is across. About 25 stars are visible in a telescope with a aperture. M26 spans a linear size of 22 light years across with a tidal radius of , and is at a distance of 5,160 light years from