Comet C46K1R1 Will Make Nearest Approach to Earth
The object discovered by the Catalina Sky Survey reaches its closest point to Earth on October 6, 2026.
Updated on Oct. 6, 2026 in Space
Live Poll
Should the government increase funding for tracking near-Earth objects like comets and asteroids?
Comet C46K1R1, discovered on September 14, 2026, is scheduled to make its nearest approach to Earth on October 6, 2026. At its closest point, the comet will be 29.4 million miles away.
Why it matters
Tracking newly discovered celestial objects allows researchers to refine orbital models and observe physical changes as comets transition through the solar system. This approach provides data on the comet's composition and behavior as it nears its perihelion.
On October 2, the comet registered a magnitude of 11.9. It featured a coma—the envelope of gas and dust surrounding the nucleus—measuring 4 arcminutes wide and a tail spanning 2 arcminutes.
The players
Catalina Sky Survey
A project based at the University of Arizona that tracks near-Earth objects and monitors the sky for transient astronomical events.
The details
Comets are celestial bodies that brighten as they approach the sun and heat up, causing frozen gases to sublimate—a process where a solid turns directly into gas without passing through a liquid phase. This gas and dust form the coma and the tail, which are visible as the object reflects sunlight. On October 2, C46K1R1 was moving across the sky at 4 degrees per day, an apparent speed projected to increase to 5 degrees per day by the time of its nearest approach.
Timeline
September 14, 2026: The Catalina Sky Survey discovered comet C46K1R1.
October 2, 2026: Imaging recorded the comet's magnitude, coma, and tail dimensions.
October 6, 2026: The comet makes its nearest approach to Earth.
October 25, 2026: The comet reaches perihelion.
The Tech Race
The detection of C46K1R1 follows the established protocol of the Catalina Sky Survey to identify and track transient objects in our solar neighborhood. This trajectory contributes to the broader cataloging efforts of near-Earth objects managed by planetary research programs.
Observers interested in tracking the comet should note that its visibility is dependent on the 11.9 magnitude measurement recorded on October 2. Professional and amateur astronomers can monitor the comet's progress using the defined orbital speed of 5 degrees per day as it passes by Earth.
The takeaway
Astronomers will monitor the comet's progression through October to gather data on its physical properties as it nears perihelion. Observers should track the October 25 perihelion date to understand how the object's brightness and speed evolve following its close pass to Earth.
What happens next
The comet is expected to reach perihelion, its point of closest approach to the sun, on October 25, 2026.
Further reading
For more on deep-space tracking and astronomical discoveries, visit the Space section.
Source note: This article includes information reported by Sky & Telescope.
Live Poll
Should the government increase funding for tracking near-Earth objects like comets and asteroids?
