Pallas

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Pallas

(păl`əs), in astronomy, 2d asteroidasteroid,
 planetoid,
or minor planet,
small body orbiting the sun. More than 300,000 asteroids have been identified and cataloged; more than a million are believed to exist in the main belt between Mars and Jupiter, with many more in the Kuiper belt
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 to be discovered. It was found in 1802 by H. OlbersOlbers, Heinrich Wilhelm Matthäus
, 1758–1840, German astronomer and physician. He originated (1797) the first satisfactory method for calculating the orbits of comets, but despite the fame it brought him, he remained an amateur astronomer and became a physician.
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. The second largest asteroid, it has a diameter of c.300 mi (480 km). Its orbit has a semimajor axis of 2.78 astronomical unitsastronomical unit
(AU), mean distance between the earth and sun; one AU is c.92,960,000 mi (149,604,970 km). The astronomical unit is the principal unit of measurement within the solar system, e.g., Mercury is just over 1-3 AU and Pluto is about 39 AU from the sun.
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 and a period of 1,684 days.

Pallas

(păl`əs), in classical mythology. 1 Name given to Athena after she killed either a youthful playmate named Pallas or, in some legends, the giant Pallas. 2 Goatish giant killed by Athena when he tried to rape her. 3 Titan, son of Creus and Eurybia, husband of Styx, and father of Nike. 4 In Vergil's Aeneid, son of Evander and an ally of Aeneas.

Pallas

((2) Pallas) The second asteroid to be discovered, found in late March 1802 by the German astronomer H.W.M. Olbers. Measuring 570 × 525 × 500 km, it is the third largest asteroid and has a spectrum similar to that of the carbonaceous chondrite meteorites. Despite being a main-belt asteroid, Pallas follows an orbit that is inclined at 34.8?% to the ecliptic. Its mass has been measured at 2.2 × 1020 kg. It orbits the Sun once every 4.62 years at a mean distance of 2.77 AU. NASA's Dawn mission, set for launch in 2006, will, if successful, visit Pallas after (1) Ceres and (4) Vesta. See Table 3, backmatter.

Pallas

 

an asteroid first observed by H. Olbers in 1802 and the second asteroid to be discovered. It is one of the four largest and brightest asteroids, whose diameters have proved possible to measure. Pallas has an approximate diameter of 490 km, a mean distance from the sun of 2.77 astronomical units, an average stellar magnitude of 8.0, and an orbit inclined toward the plane of the ecliptic at a relatively large angle i — 34.8°. The asteroid is named after the ancient Greek goddess Pallas Athena.

Pallas

[′pal·əs]
(astronomy)
The second-largest asteroid, with a diameter of about 324 miles (540 kilometers), mean distance from the sun of 2.769 astronomical units, and C-type surface composition.