C/2022 E3 (ZTF) is a non-periodic comet from the Oort cloud that was discovered by the Zwicky Transient Facility (ZTF) on March 2, 2022. The comet has a bright green glow around its nucleus, due to the effect of sunlight on diatomic carbon and cyanogen. The comet's systematic designation starts with C to indicate that it is not a periodic comet, and "2022 E3" means that it was the third comet to be discovered in the first half of March 2022.

The comet nucleus was estimated to be about approximately 0.81-2.79 km (0.50-1.73 mi) in radius, rotating every 8.5 to 8.7 hours. Its tails of dust and gas extended for millions of kilometers and, during January 2023, an anti-tail was also visible.

The comet reached its perihelion on January 12, 2023, at a distance of 1.11 AU (166 million km), and the closest approach to Earth was on 1 February 2023, at a distance of 0.28 AU (42 million km). The comet reached magnitude 5 and was visible with the naked eye under moonless dark skies.

Stunning images capture the moment a green comet's tail is blasted away by the sun   Live Science - January 23, 2023
An amateur astronomer witnessed the moment that the green comet C/2022 E3 had part of its tail blasted away by a coronal mass ejection. A rare green comet passing through our solar system for the first time in 50,000 years received a warm welcome from the sun this week... perhaps too warm. Images captured by Michael Jäger an amateur astronomer based in Austria, reveal a huge spike of gas disconnecting from the comet's tail and drifting off on the solar wind. This impromptu tail reduction was almost certainly caused by an explosion of super-charged solar particles called a coronal mass ejection (CME),

Newly discovered green comet comes close to Earth   BBC - February 1, 2023

Green comet flaunts its tail in dazzling deep space photo 
BBC - February 1, 2023