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Today, comet C/2017 K2 will make its closest approach to Earth, and you can watch the flyby live. An astronomer first sighted the comet in 2017; a small telescope should be able to observe it throughout the summer.
EarthSky estimates that Comet C/2017 K2 was located 1.49 billion miles from the sun when it was first discovered. In addition to having a large nucleus, it appears to have a very large cometary atmosphere. At the time of its discovery, it was the farthest active inbound comet astronomers had seen.
In 2022, the comet will be closest to Earth today, July 14, when it will be orbiting in the inner solar system. Hubble's observations suggest Comet K2 has a nucleus that measures 11 miles in diameter.
Compared to K2, the second largest mountain on Earth at 28,251 feet, 11 miles correspond to approximately 58,000 feet or 18,000 meters. Therefore, the nucleus of Comet K2 would be near twice the size of Mountain K2.
Furthermore, Comet K2's cometary atmosphere, or coma, has an approximate diameter of 81,000 miles, adding to its enormous size.
Consequently, the sphere of gases is 10 times the diameter of the Earth, or nearly as large as Jupiter. This colossal coma is further compounded by observations indicating that its tail is approximately 500,000 miles long.
The nucleus of most other comets detected so far has a diameter of between 0.5 miles and 2 miles. It is however reported that there are several gigantic ones as well, such as Hale-Bopp which is said to be 37 miles or 60 kilometers in length, and Bernardinelli-Bernstein which is said to be an incredible 93 miles or 150 kilometers in length.
You can see Comet C/2017 K2 all summer long with a small telescope if you join the public in observing the colossal comet.
From the Northern Hemisphere, it will be visible until mid-September, then closer to the southwestern horizon shortly afterward. In the Southern Hemisphere, viewing the comet should be best beyond the end of September.
You can watch the cosmic flyby live via Virtual Telescope's WebTV beginning at 6 p.m. EST. There will be a distance between the comet and Earth of approximately 172 million miles.
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