Comet 10P/Tempel 2: rare observation reveals details of its dust trail in July

Astronomers and sky enthusiasts will have a unique chance to observe comet 10P/Tempel 2, which displays a rare dust trail reminiscent of Saturn’s rings seen from the side. This ancient flow of larger particles, different from common cometary tails, follows the star’s orbital path. Discovered in 1873, the 10.6-kilometer-diameter comet completes a solar orbit every 5.4 years, and its perihelion will be on August 2, with the closest approach to Earth on August 3, 2026. The dust trail appears remarkably narrow and bright between July 18 and 22, 2026, the period when Earth crosses its orbital plane. Although it is not visible to the naked eye, it is possible to observe it with binoculars or small telescopes in the constellation Capricorn, in places with low light. To capture the distinctive trail, you need to resort to astrophotography.

Comet 10P/Tempel 2 can be seen in the southern portion of the sky just after dusk anywhere in the Northern Hemisphere. Observation requires the use of binoculars or telescopes.

Comet 10P/Tempel, also known as Tempel 2, makes its most recent pass through the inner solar system, providing a unique opportunity to observe one of the most extraordinary features ever recorded on a comet. For skywatchers, it represents a chance to witness a stream of debris accumulated over centuries of journeys around the Sun.

Characteristics and orbit of comet 10P/Tempel 2

Comet 10P/Tempel 2 was first discovered on July 4, 1873. Its diameter is estimated at 10.6 kilometers, a size comparable to that of the famous Halley’s Comet. It completes one rotation around the Sun in approximately 5.4 years and is already visible through binoculars or small telescopes in the constellation Capricorn.

The star will reach its perihelion, the closest point to the Sun, on August 2, 2026. It will then make its closest approach to Earth on August 3, 2026, remaining visible for several weeks.

A visual representation of the comet’s position in the night sky can help observers identify it more accurately during the viewing period.