A Messier Moment for Tempel 2

• A new image features the periodic comet 10P/Tempel 2 alongside the globular star cluster Messier 30 (M30).
• The objects appear similar in telescopes, mirroring the confusion encountered by Charles Messier in the 18th century.
• Despite appearing close, the two are separated by a vast distance of roughly 28,000 light-years.

Scientific Context

• 10P/Tempel 2: A periodic comet characterized by a diffuse, greenish coma.
• Messier 30 (M30): A globular star cluster cataloged by Charles Messier as one of many "fixed" objects that were not comets.
• Distance disparity: The comet is located only 3.5 light-minutes from Earth, while M30 is approximately 28,000 light-years away.

Historical Significance

• The Messier Catalogue was compiled by 18th-century astronomer Charles Messier to distinguish static nebulae and star clusters from the comets he was actively tracking.
• While the comet's dust trail visually overlaps with the cluster in recent captures, the pairing serves as a modern illustration of the observational challenges faced by early comet hunters.