An eleven-meter near-Earth asteroid exhibits non-gravitational acceleration that defies standard orbital mechanics, drawing intense scientific scrutiny as researchers weigh theories ranging from volatile gas venting to a long-lost Soviet space probe, according to reporting by Fox News and ScienceAlert.
Discovered orbiting within the solar system, 1998 KY26 rotates once every five minutes and 21 seconds. The object displays acceleration perpendicular to its orbital plane. Gravity alone cannot account for this motion.
Solar heat may vaporize internal ice
Scientists initially suspected the object might be a dark comet. Comets generate thrust when solar heat vaporizes internal ice into escaping gas. Dark comets exhibit this outgassing without displaying visible tails or dust clouds.
Their thermal modeling indicates that even the coldest regions of 1998 KY26 maintain average temperatures of 212 Kelvin, or minus 61 degrees Celsius, during its solar orbit. This is higher than the 145 Kelvin threshold required to preserve water ice over long periods.
The study estimates that if one percent of the asteroid’s mass consisted of water ice, solar heat would exhaust it within 2,000 years. Sustaining the currently observed acceleration via gas venting would deplete all internal ice in roughly 62 years.
The Phobos 1 probe proposition
A separate hypothesis suggests the anomaly is not a natural rock.
The research team built a simplified computer model of the spacecraft. They compared its simulated light reflection against eight observation datasets of 1998 KY26. The modeled probe matched the brightness variations observed in the asteroid data. Accounting for solar radiation pressure on the main body and solar panels improved the trajectory fit.
Loeb and his colleagues cautioned that current data does not definitively prove the two objects are identical. Separate research published this year in Astronomy & Astrophysics maintains that the reflectance spectrum of 1998 KY26 aligns with rocky asteroids originating from the inner asteroid belt.
Jared Isaacman denies collision threat while Hayabusa2 mission plans observation
Jared Isaacman told Fox News on November 12, “This object is in no danger of colliding with Earth.” Isaacman added that the agency has seen no evidence that the body poses any threat or consists of anything other than a standard asteroid.
Definitive answers may arrive in the next decade. The Japan Aerospace Exploration Agency plans to direct its Hayabusa2 spacecraft toward 1998 KY26 in July 2031 as part of an extended mission. Close-range imaging and compositional analysis by the probe are expected to resolve the debate over the asteroid’s true identity and the mechanical cause of its acceleration.
