Discover the Best Way to Spot Comet Lemmon in October
In January 2025, astronomers discovered a faint light at the Mt. Lemmon Observatory in Arizona. This light turned out to be Comet Lemmon (C/2025 A6), which hails from the distant parts of our solar system. It has a lengthy orbital period of approximately 1,350 years. Initially, the comet was too dim to be observed without advanced equipment. However, by fall 2025, it had brightened enough to be seen with binoculars and may soon become visible to the naked eye.
Observing Comet Lemmon in October
Comet Lemmon will reach its closest point to Earth around October 21, 2025. At that time, it will be approximately 0.60 astronomical units away. Shortly thereafter, on November 8, the comet will reach perihelion, the closest point to the sun. This proximity will likely coincide with its maximum brightness, making it easier to spot under ideal conditions.
Characteristics of Comet Lemmon
- Orbital Period: 1,350 years
- Closest Approach to Earth: October 21, 2025
- Distance at Closest Approach: 0.60 astronomical units
- Perihelion Date: November 8, 2025
- Color: Greenish tint due to carbon molecules in the coma
As the comet nears the sun, its tail will elongate significantly. This tail forms when solar radiation heats the comet, causing frozen gases and ice to vaporize. Consequently, the material escapes, forming a distinctive streak behind it in the sky.
Viewing Tips
As of early October, Comet Lemmon can be located just below the handle of the Big Dipper in the Ursa Major constellation. Observers in the northern hemisphere can expect to see it trending northwest to west after sunset from mid-October onwards. It will appear at a low altitude above the horizon, radiating a subtle glow during twilight.
The best opportunities to view the comet occur about a week before and after its closest approach. In November, it will cross the celestial equator and become visible from the southern hemisphere. Binoculars or small telescopes are recommended for optimal viewing. Choosing a site with minimal light pollution will also enhance your chances of seeing the comet with the naked eye.
If you encounter difficulties locating Comet Lemmon, star map apps or planetarium software can assist in navigation, helping you pinpoint its exact position in the evening sky.
