Great Comet of 1882

The Great Comet of 1882, formally designated as C/1882 R1, 1882 II, and 1882b, was a comet that became very bright in September 1882. It is part of a special group called Kreutz sungrazers, which are comets that pass very close to the Sun at their closest point.

This comet was so bright that people could see it even during the daytime near the Sun. It came closest to Earth on September 16, 1882, and then reached its closest point to the Sun the next day on September 17. At its brightest, it was one of the brightest comets ever seen.

Discovery

The comet appeared in the morning skies in September 1882. People first saw it around September 1 from places like the Cape of Good Hope and the Gulf of Guinea. Soon, many people in the Southern Hemisphere spotted it.

The first astronomer to write down what he saw was W. H. Finlay. He worked at the Royal Observatory in Cape Town, South Africa. On September 7, he noted the comet looked about as bright as a star and had a short tail. The comet got brighter very quickly. It became easy to see even during the daytime near the Sun.

Perihelion

The comet was moving quickly toward perihelion when people first saw it. At its closest point, it was about 300,000 miles or 480,000 kilometres from the Sun’s surface. Because it came so close, it is called a sungrazing comet. For many hours before and after this closest point, the comet could be seen in the daytime sky next to the Sun. It became very bright, with an estimated magnitude of −17.

After reaching this closest point on September 17, the comet transited the Sun. An observer named Finlay watched it using a special neutral density filter until it disappeared behind the Sun. The Sun’s edge looked very active, and then the comet was gone from view.

Post-perihelion evolution

After the comet came closest to the Sun, it moved into darker parts of the sky. Even though it became dimmer, it stayed very bright. By late September, people saw that the bright center of the comet looked stretched and split into two bright spots. By mid-October, it had broken into at least five pieces, and these pieces changed in brightness each day.

Around the middle of October, the comet showed something called an antitail, which pointed toward the Sun. Antitails happen because of the way the comet’s path looks from Earth. The comet’s center grew to its biggest size by December 1882. It slowly faded but could still be seen without a telescope until February 1883. The last time anyone saw it clearly was in June 1883.

Orbital studies

Studies of the Great Comet of 1882 showed that it followed a path like other bright comets seen before, such as C/1843 D1 and C/1880 C1. These comets also appeared suddenly near the Sun. Scientists think these comets might be pieces from one big comet that broke apart long ago.

A scientist named Heinrich Kreutz studied these comets and suggested they were fragments of an older comet. Today, we know that the Great Comet of 1882 is part of a group called the Kreutz sungrazers. These comets all come from the same original comet. Some scientists thought an ancient comet from around 372–371 BC might have been the source, but newer studies suggest comets from the years 423 or 467 are more likely. Pieces of the Great Comet of 1882 might return in the years 2487 to 2719.