A comet with a period of 200 years or more.
A comet with a period of 200 years or more.
Long period comet
Comet (C/2010 X1 (Elenin)) is a long-period comet.
600,000,000,000,000,000,000,000,000,000
The orbital period of Halley's Comet is about 75.3 years.
each 76 years
Between 74 and 76 years.
That depends on what you call 'long' or 'short'. Halley's period is in the neighborhood of 75 years, give or take a few years. Since that's short enough for two perihelions to occur within a single human lifetime, I guess it ought to be considered a short period.
A short period comet.
Halley's comet has a period of 76 years.
Not more than 200 years - less than 200 years. As to the "why", that's because this is how "short-period" vs. "long-period" is defined. Any comet that takes less than 200 years for one revolution is defined as short-period.
Long period comets originate in the Oort Cloud.