関連する実験動画
Updated: May 8, 2026

11:34
Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
ウランのトロイの木馬と,一時的な巨大惑星の共同軌道の頻度
Mike Alexandersen1, Brett Gladman, Sarah Greenstreet
1Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada. mikea@astro.ubc.ca
まとめ
天文学者は,7万年以上にわたって安定したラグランジュ点で天王星の周りを回るトロイの木馬の天体を発見しました. この発見は,巨大惑星による一時的な共同軌道捕獲の頻度を推定するのに役立ちます.
科学分野:
- 惑星科学は惑星科学である.
- 天文学 天文学
- 軌道ダイナミクス 軌道ダイナミクス
背景:
- トロイの木馬は,惑星の軌道を共有する小惑星で,安定した三角ラグランジュ点 (L4およびL5) の近くに位置しています.
- 天王星は他の巨大惑星と同様に,トロイの木馬の集団をホストすると疑われていましたが,いずれも決定的に特定されていません.
研究 の 目的:
- 天王星と関連したトロイの木馬の物体の最初の検出を報告する.
- 巨大惑星,特に天王星と海王星による一時的な共同軌道捕獲の頻度と期間を推定する.
主な方法:
- 数学的統合は,検出されたオブジェクトの長期軌道行動をシミュレートするために使用されました,2011 QF99.
- 共同軌道捕獲率を推定するために,トランス・ネプチューン領域から供給されたセンタウルの計算モデルが開発されました.
主要な成果:
- オブジェクト2011 QF99はウランのトロイの木馬であると確認され,L4ラグランジュ点の周りに7万年以上振動しています.
- 数学的シミュレーションでは,惑星の0.4%と2.8%が,それぞれ,ウランと海王星の一時的な共同軌道であることを示しています.
- 既知のセンタウルの間で観測された共同軌道分子は,トランス・ネプチューンの供給からの予測と一致しています.
結論:
- 2011 QF99の発見は,ウランのトロイの木馬の存在を確認しています.
- この研究は,太陽系外部の小さな天体の動力学と,一時的な共同軌道捕獲のプロセスに関する貴重な洞察を提供します.
関連する概念動画
Atomic Orbitals
An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
The Energies of Atomic Orbitals
In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
Hybridization of Atomic Orbitals II
sp3d and sp3d 2 Hybridization
Electron Orbital Model
Orbitals are the areas outside of the atomic nucleus where electrons are most likely to reside. They are characterized by different energy levels, shapes, and three-dimensional orientations. The location of electrons is described most generally by a shell or principal energy level, then by a subshell within each shell, and finally, by individual orbitals found within the subshells.
The first shell is closest to the nucleus, and it has only one subshell with a single spherical orbital called the...
The first shell is closest to the nucleus, and it has only one subshell with a single spherical orbital called the...
Hybridization of Atomic Orbitals I
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Atomic Nuclei: Larmor Precession Frequency
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...

