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A short period comet is conventionally defined as a comet having an orbital period of less than 200 years. What is the maximum possible aphelion distance for a short period comet with a perihelion of 0.5 AU? Where does this place the comet relative to the outer planets? (3)
If a is expressed in astronomical units (AUâs) and T is in years, then the constants can be suppressed and we have simply T2 = a3. For an orbital period of T = 3600 years, as Nibiru is supposed to have, the semi major axis is therefore. a = ( 36002 )1/3 = 234.892 AU or about 235 AU, where 1 AU = 149,600,000 km.