One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30000 years.
Answer:
r = semi major axis 2184.05 AU
1 AU = 149,597,870,691 ± 30 m
Sun Pluto distance = 5.9 x10^12 m
Alpha Centauri
Distance of Alpha Centauri = 4.3 light year
=41 x 10^15 m
r /r Alpha Centauri = 1.94e+16
