A tailed orbiter is a type of COMET that has a visible tail due to the presence of dust and gas. It is composed of a nucleus, which is a solid body made up of ice and dust, and a coma, which is a cloud of gas and dust that surrounds the nucleus. The tail is created when the sun's radiation heats up the coma, causing the dust and gas to be released and pushed away from the nucleus. This creates a long, curved tail that can be seen from Earth.