Summary
NASA says Hubble completed its 200,000th orbit around Earth on Sept. 19, 2026, the same day it imaged galaxy cluster MACS J0417. The observatory is making repeated observations as astronomers anticipate a lensed reappearance of supernova Athena.
NASA’s Hubble Space Telescope completed its 200,000th orbit around Earth on Sept. 19, 2026, the same day it captured an image of galaxy cluster MACS J0417. The observations are part of a campaign to watch for the predicted reappearance of supernova Athena, whose changing arrival times could help astronomers study both the cluster and the universe’s expansion.
NASA says the James Webb Space Telescope discovered Athena in 2025. The supernova lies far behind MACS J0417, whose gravity bends and magnifies its light. NASA expects Athena to reappear sometime between the Sept. 23 announcement and early March 2027.
Why astronomers are watching the cluster
A massive foreground object can act as a gravitational lens: its gravity deflects light from more distant objects, producing magnified or multiple views. The routes light takes through and around the cluster can differ, so images of a variable source such as a supernova may become visible at different times.
NASA says measuring the timing of Athena’s reappearances can help researchers map the mass of MACS J0417. That mass shapes how the cluster bends light, making the timing useful for understanding the lens itself. The measurements may also help refine estimates of the universe’s expansion rate.
Hubble’s 200,000th orbit is a separate operational milestone. The Sept. 19 image links that milestone to an ongoing scientific programme, but the central astronomy target is still a forecast: researchers are monitoring the cluster for Athena’s expected return within the stated window.