1. Mellish 1917 :
Mellish was an impressive periodic comet mainly seen in the southern hemisphere. Many astronomers believe that Mellish could possibly return in 2061, the same year as Halley.
2. Skjellerup Maristany 1927 :
Comet SkjellerupMaristany was a long period comet that became very bright in 1927. This great comet was observable to the naked eye for about thirty two days and was independently discovered by Australian astronomer John Francis Skjellerup and Argentine astronomer Edmundo Maristany.
3. Brooks 1911 :
This bright comet was discovered in July 1911 by astronomer William Robert Brooks. It is best remembered for becoming a bright naked eye object and its distinct blue color, which was the result of the emission of carbon monoxide ions.
4. De Kock Paraskevopoulos 1941 :
This weirdly beautiful comet is best remembered for its long but faint tail and was visible at both dawn and dusk. It was independently discovered by an amateur astronomer named De Kock and decorated Greek astronomer John S. Paraskevopoulos, who also discovered a crater on the moon and named it after himself.
5. Great Comet of 1577 :
One of the first comets to be seen with the naked eye in modern history, the Great Comet of 1577 passed close to Earth. It was viewed by many people all over Europe, including the Danish astronomer Tycho Brahe. From his observations of the comet, Brahe was able to discover that comets and similar objects travel above Earths atmosphere.
6. Daniel 1907 :
Photographed more than any comet that came before it, Comet Daniel was one of the most widely seen comets of the early twentieth century.
7. Hyakutake 1996 :
Comet Hyakutake is a comet discovered on January 31, 1996, that passed very close to Earth in March of that year. It was dubbed the Great Comet of 1996, and its passage near Earth was one of the closest approaches of the previous two hundred years.
8. Hale Bopp 1997 :
HaleBopp was perhaps the most widely observed comet of the twentieth century and one of the brightest seen in contemporary history. It was visible to the naked eye for a record eighteen months, twice as long as the previous record holder, the Great Comet of 1811. According to a survey by Maricopa Research, the comet was seen by eighty one percent of American adults.
9. Great September Comet 1882 :
This was a comet that became very bright in September 1882. It was so bright that it could be seen next to the sun at its perihelion.
10. Lovejoy 2011 :
Comet Lovejoy is a long period comet and Kreutz Sungrazer (a family of sun grazing comets, characterized by orbits taking them extremely close to the sun at perihelion). It was discovered in November 2011 by Australian amateur astronomer Terry Lovejoy.
11. Bennett 1970 :
Discovered by John Caister Bennett on December 28, 1969, while still almost two astronomical units from the sun, Comet Bennett, formally known as C/1969 Y1, was one of two brilliant comets to grace the 1970s, along with Comet West.
12. Ikeya Seki 1965 :
Also known as the great twentieth century comet, this showstopper was the brightest comet of the previous century, visible in full daylight within a few degrees of the sun. According to Japanese observers it appeared to be about ten times brighter than a full moon.