Yarkovsky–O'Keefe–Radzievskii–Paddack effect或缩写为YORP效应，是亚尔科夫斯基效应的二阶变化，它能够改变天体的自转速率 (像是小行星)。这个项目是大卫·鲁宾侃博士在2000年新创的。

在19世纪，伊凡·亚尔科夫斯基意识到天体受到太阳加热之后会以红外线的形式带走动量和热。转换成现代物理学的说法，每个光子逃逸时会带走一些动量p = E/c，此处E (=hν) 是它的能量，c是光速。Radzievskii应用基于自转速率受到反照率影响的想法，以及Paddack和O'Keefe意识到形状对自转速率改变的效果更大。Paddack和Rhee建议YORP效应可能会造成非对称的太阳系小天体旋转的突然变化和消除。

The Yarkovsky–O'Keefe–Radzievskii–Paddack effect, or YORP effect for short, is a second-order variation on the Yarkovsky effect that changes the rotation rate of a small body (such as an asteroid). The term was coined by David P. Rubincam in 2000.

In the 19th century, Ivan Yarkovsky realised that the infrared radiation escaping from a body warmed by the Sun carries off momentum as well as heat. Translated into modern physics, each photon escaping carries away a momentum p = E/c where E (= hν) is its energy and c is the speed of light. Radzievskii applied the idea to rotation based on changes in albedo and Paddack and O'Keefe realised that shape was a much more effective means of altering a body's spin rate. Paddack and Rhee suggested that the YORP effect may be the cause of rotational bursting and eventual elimination from the solar system of small asymmetric objects.