US EditionPublished • loading... • Updated
This Rare Green Comet Won’t Return for a Thousand Years. Here’s How to See It This Week.
Comet Lemmon’s green glow is caused by diatomic carbon and it will be closest to Earth around October 21, visible to binocular users in the northern hemisphere.
- On October 21, 2025, Comet Lemmon will make its closest approach to Earth, passing at about 0.60 au and coinciding with a new moon for darker skies.
- Discovered in early January at the Mt. Lemmon Observatory in Arizona, Comet Lemmon has an orbital period about 1,350 years.
- Observers should note Comet Lemmon will be about 28 million miles from Earth at perigee; use binoculars or small telescopes and dark-sky locations for best viewing.
- This year's brightest comet offers a rare public and scientific opportunity, with Comet Lemmon's greenish coma caused by diatomic carbon visible to skywatchers and researchers.
- Visible low in the western sky between Oct. 23 and Nov. 2, the comet appears about an hour after sunset, with November 8 perihelion and the Orionid meteor shower peak on October 23.
Insights by Ground AI
11 Articles
11 Articles
The comet will be visible at least with binoculars if the weather is clear. The comet may brighten in late October.
·Helsinki, Finland
Read Full Article
Coverage Details
Total News Sources11
Leaning Left2Leaning Right1Center2Last UpdatedBias Distribution40% Left, 40% Center
Bias Distribution
- 40% of the sources lean Left, 40% of the sources are Center
40% Center
L 40%
C 40%
R 20%
Factuality
To view factuality data please Upgrade to Premium