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Answer:
'The Study or Technique of determining the sizes of Asteroids is known as Thermal Radiometry.' It is also the most widely used technique for determining the sizes of other small bodies in the Solar System. This technique is based on fact that the infrared radiation (heat) emitted by an Asteroid must balance the solar radiation it absorbs. By using a so-called thermal model to balance the measured intensity of infrared radiation with that of radiation at visual wavelengths, investigators are able to derive the diameter of the Asteroid. Other remote-sensing techniques—for example, polarimetry, radar, and adaptive optics (techniques for minimizing the distorting effects of Earth’s atmosphere)—also are used, but they are limited to brighter, larger, or closer Asteroids.
Category : Asteroids
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