Pallas
Pallas is the third-largest asteroid in the Solar System by volume and mass. It is the second asteroid to have been discovered, after Ceres, and is likely a remnant protoplanet. Like Ceres, it is believed to have a mineral composition similar to carbonaceous chondrite meteorites, though significantly less hydrated than Ceres. It is 79% the mass of Vesta and 22% the mass of Ceres, constituting an estimated 7% of the total mass of the asteroid belt. Its estimated volume is equivalent to a sphere 507 to 515 kilometers in diameter, 90–95% the volume of Vesta.
asteroid
발견일: 1804-08-27
관측 횟수: 9,772
Pallas is the third-largest asteroid in the Solar System by volume and mass. It is the second asteroid to have been discovered, after Ceres, and is likely a remnant protoplanet. Like Ceres, it is believed to have a mineral composition similar to carbonaceous chondrite meteorites, though significantly less hydrated than Ceres. It is 79% the mass of Vesta and 22% the mass of Ceres, constituting an estimated 7% of the total mass of the asteroid belt. Its estimated volume is equivalent to a sphere 507 to 515 kilometers in diameter, 90–95% the volume of Vesta.
궤도 파라미터
반장축
2.77 AU
이심률
0.2307
근일점
2.131 AU
원일점
3.409039 AU
궤도 경사
34.93°
공전 주기
4.5996 yr
历元
2461200.5
평균 근점각
254.25°
Orbit diagram
The Sun sits at the focus (orange). Earth's orbit is the grey circle at 1 AU. The red dot marks the object's position at the catalog epoch.
물리적 파라미터
직경
513.0 km
반사율
0.155
밀도
2.89 g/cm³
자전 주기
7.8132214 h
절대 등급
4.12
궤도 품질
RMS
0.35838
상태 코드
0
궤도 ID
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