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The symbol for 2 Pallas , the spear of Pallas Athena , was invented by Baron Franz Xaver von Zach , who organized a group of twenty-four astronomers to search for a planet between the orbits of Mars and Jupiter .
 2 Pallas, Pallas Athena, Franz Xaver von Zach, Mars, Jupiter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 2 Pallas, Pallas Athena, Franz Xaver von Zach, Mars, Jupiter