NASA's Swift Observatory Ends Mission as Uncontrolled Reentry Draws Near

Swift was designed to study gamma-ray bursts, the powerful cosmic explosions that became central to its long observing career. The spacecraft dates to 2004, according to The Register.

The Neil Gehrels Swift Observatory ultimately operated for nearly 22 years. Its mission has now officially ended, Live Science reported, closing a long chapter of observations but leaving scientists with a substantial archive.

A rescue attempt over the summer failed, leaving Swift headed toward atmospheric reentry. The spacecraft made its final observation on October 20, according to The Register, which reported on October 26 that reentry was expected within the next few weeks.

On October 27, Nature reported that astronomers were mourning the observatory and described its remaining scientific legacy as a massive archive of data. Its report put the expected fall into the atmosphere in the following week.

The spacecraft was already orbiting less than 275 kilometres above Earth's surface, La Nacion reported on October 27. That report described a telescope whose mission had ended while its descent continued.

By October 30, Fanpage was reporting an expected uncontrolled reentry in early November. On October 31, Global News carried a U.S. Space Force prediction that Swift would come down on or around Friday. Those published forecasts do not provide a single consistent reentry date.

Swift's scientific work is over, but its physical return to Earth remains pending in the supplied coverage. CBC Top Stories reported on October 31 that the failed rescue effort had left the aging telescope dropping progressively lower.

Most of the 1.5-ton telescope is expected to burn up in the atmosphere. However, a handful of tungsten pieces, along with some mirror parts, could survive, The Hindu reported, citing NASA's Brad Cenko. The coverage does not establish where any surviving debris would land.

The immediate questions are when Swift will reenter and whether any surviving debris will reach the surface. The forecasts reported by Fanpage and Global News differ, so neither should be treated as a confirmed arrival time.

Beyond reentry, Swift's archive remains its lasting scientific resource. Nature reported that the observatory leaves behind a massive collection of data, even though it can no longer make new observations.