NASA Astronomy Picture of the Day 10 February 2023: Awesome! Comet ZTF meets Comet ATLAS

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The Green Comet ZTF passed Earth at its closest distance on February 1 and it was seen by astronomers and sky-watchers alike all over the world. Comets are of interest to scientists because they are remnants of the early Solar System, and can tell us about the conditions and composition of the early Solar System. Although comets often make close flybys, the Comet C/2022 E3 (ZTF) is particularly special as it has a period of around 50000 years. That means the last time it flew past Earth closely; it was seen by Neanderthals during the Upper Paleolithic period on Earth nearly 50000 years ago.

NASA's Astronomy Picture of the Day is a breathtaking picture of the Comet ZTF racing across the skies as it passed another comet named Comet C/2022 U2 (ATLAS) near the constellation Auriga. The picture was captured from a garden observatory in Germany's Bavarian Forest by astrophotographer Stefan Bemmerl.

With the help of a 48-inch (1.2-meter) Samuel Oschin robotic telescope, astronomers discovered Comet C/2022 E3 ZTF on March 2, 2022. The telescope is part of the Zwicky Transient Facility (ZTF), located at Mt. Palomar in southern California. Also, it was the 3rd celestial object found in the fifth month (A, B, C, D, E) of the year. And that's how it got its name comet 2022 E3 (ZTF).

Fading as it races across planet Earth's northern skies comet C/2022 E3 (ZTF) shares this telescopic frame with comet C/2022 U2 (ATLAS). Captured on the night of February 6 from a garden observatory in Germany's Bavarian Forest, the starry field of view toward the constellation Auriga spans about 2.5 degrees. Discovered by sky survey projects in 2022 (the Zwicky Transient Facility and the Asteroid Terrestrial-impact Last Alert System) these long-period