NASA Study Finds Near-Earth Asteroid Is Actually a Comet

A recent NASA study has identified a near-Earth object, previously thought to be an asteroid, as actually being a comet. This object's motion through space was precisely tracked, revealing irregularities that are characteristic of comets. The object's dual personality was uncovered using powerful observatories and NASA's Deep Space Network.

What happened

The object, provisionally known as the asteroid 1998 SH2, passed safely within 2 million miles of Earth during its 4½-year orbit around the Sun. Researchers had calculated its position using data from previous orbits, but when it didn't show up where expected, they realized something was influencing its motion. By precisely measuring the object's position in the sky, scientists identified the cause: nongravitational perturbations affecting its motion.

These perturbations were found to be incompatible with the object being an asteroid, leading researchers to suspect it could be an active comet. Analyzing all observations collected since its discovery in 1998, researchers determined the perturbations to 1998 SH2's motion and hypothesized that the object may be generating a small thrust by venting gas into space.

This venting results from the Sun heating ice mixed with rocky material, turning the ice into a gas. Although 1998 SH2 doesn't display the typical bright tail and coma of a regular comet, its motion indicates it is producing gas and dust in smaller quantities.

Why it matters

The reclassification of 1998 SH2 from an asteroid to a comet has implications for our understanding of near-Earth objects and their potential impact on our planet. This discovery highlights the importance of continued monitoring and study of these objects to better understand their behavior and potential risks.

How to think about it

When considering the reclassification of 1998 SH2, it's essential to understand that the object's behavior is not representative of all near-Earth objects. This discovery highlights the complexity and diversity of objects in our solar system, emphasizing the need for continued study and exploration.

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