Centaurs are trans-Saturnian objects that have only been discovered in the last quarter-century and are one of the newest additions to astrology. Because they are so much farther away than the asteroids, they take significantly longer to orbit the Sun.
They have irregular and unstable orbits, and are more numerous than the "true" planets with more than 50 known to date. According to astronomers, they are a unique group and are rarer than the asteroids and the trans-Neptunian objects that number in the hundreds to hundreds of thousands.
All are smaller than the four largest asteroids: Ceres (now also a dwarf planet), Pallas, Vesta and Hygiea. Some appear to have atmospheres: this is because they show cometary aspects, such as occasionally forming a tail when they approach the Sun.
Mythologically the centaurs were crude, unintelligent and unrefined. In the same respect, many of the astrological community approaches them with less dignity than the celestial bodies now considered planets, in particular the first five planets known to humans aside from the Earth: Mercury, Venus, Mars, Jupiter and Saturn. However, many astrologers believe the centaurs are of major astrological significance, recognizing one or more as rulers of Zodiac signs.
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—Kurt Vonnegut, Jr. (b. 1922)