5875
Brian G. Marsden computed the parabolic and elliptical orbits which suggested an orbital period of 8.76 years , later revising the data to give a perihelion date of 30 November 1963 and orbital period of 7.93 years .
 person: Brian G. Marsden
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Brian G. Marsden 
Answer:
 person: Brian G. Marsden