As the Link spacecraft struggles with control on its way to reboost Swift, Betelgeuse's candidate companion appears in one night's image. Both developments depend on preserving a narrow observing window.
Swift is near 350 km and may reach NASA's critical 300 km threshold in October. Link was sent to meet it and raise its orbit. Two of Link's three reaction wheels malfunctioned, its control thrusters worked only partly, and it entered a multi-axis spin. Communications dropped and the bus reset. A 24 July thruster test had added about 2 km; Katalyst says the mission retains a viable rendezvous path.[1]
For Betelgeuse, celestial mechanics set the window. On 6 December 2024, near the candidate's maximum separation, VLT's SPHERE-ZIMPOL imaged a faint source 52.32 milliarcseconds from the star. Two methods found it at 6.1 and 5.1 sigma. Its contrast implies 2.6–3.1 solar masses and a minimum orbit of 5.9–5.5 years. The paper says formal confirmation that it is bound requires a second epoch.[2]
One story concerns operations and the other stellar observation, yet both depend on a window that cannot be recalled. Swift's falling orbit leaves the Link team little intervention time. Betelgeuse's candidate orbit of about six years makes the best separation impossible on demand. Success means restoring control and rendezvous in the first case; in the second, seeing the source at a new position and measuring its motion. Together they show the narrow conditions that keep observation possible.[1], [2]
