![]() Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning. All observations were performed with the FCRAO 14 m radome-enclosed telescope in New Salem, Massachusetts.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.From tech to household and wellness products. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.The two tails of the comet vary in length depending upon how close the comet is to the sun they measured 50–60 million miles (80–97 million kilometers) in length in March 1998. Measurements based on images taken by the Hubble Space Telescope indicate that the diameter of Hale-Bopp is roughly 25 miles (40 kilometers), slightly larger than the diameter of Comet Halley, which measures 12 miles (20 kilometers) across. The other tail is called the dust tail this structure curves away from the comet and is generally white to yellowish white. ![]() ![]() It is generally blue in color and points away from the sun. Its absolute magnitude of -1 makes it one of the brightest comets to reach the inner solar system in history. The nucleus is exhibiting sudden brief eruptions and a complex mottled surface. One tail, known as the ion tail, is made up of ion gases. The nucleus of Hale-Bopp is estimated to be about 30 to 40 km across - Comet Halley's nucleus was estimated at 8 x 8 x 16 km. Its beautiful twin tails are more readily viewable than those of many other comets. Its magnitude varies with its distance, but in 1998 it had a luminosity of 9.0–9.2. Like other comets, Hale-Bopp is composed of ice, dust, and gas. By 1998, the distance between the comet and the sun had increased to 468 million miles (753 million kilometers), and its distance from the Earth was 481 million miles (774 million kilometers). A fascinating introduction to the recently discovered Comet Hale. In contrast, the speed of the comet at aphelion-the point at which it was farthest from the sun-was 250 miles (402 kilometers) an hour. Read reviews from worlds largest community for readers. The perihelion-the point at which the comet makes its closest approach to the sun-occurred on April 1, 1997, when Hale-Bopp was only 85 million miles (137 million kilometers) from the sun, traveling at a speed of 98,000 miles (157,711 kilometers) per hour. The comet was visible in the Northern Hemisphere between March and April of 1997, then became a Southern Hemisphere object for several months before disappearing from unaided view. While the comet did not come as close as Comet Hyakutake, which closed to within about 9 million miles (14 million kilometers) of Earth in 1996, Hale-Bopp was estimated to be more than 13 times brighter than Hyakutake and therefore easily visible to the unaided eye. It is not expected to return to the inner solar system until the year 4300.Ĭomet Hale-Bopp made its closest approach to Earth on March 22, 1997, when it passed only 122 million miles (196 million kilometers) away. Astronomers estimate that Hale-Bopp formed in the year 2213 bc. Officially designated as C/1995O1, Comet Hale-Bopp appears 1,000 times brighter than Comet Halley appeared at the same distance from Earth. An unusually bright comet was discovered independently by two amateur astronomers-Alan Hale of New Mexico and Thomas Bopp of Arizona-in the southwestern United States in 1995.
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