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首页> 外文期刊>The Astrophysical Journal. Letters >The dust tail of asteroid (3200) phaethon
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The dust tail of asteroid (3200) phaethon

机译:小行星(3200)Phethon的尘埃尾巴

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We report the discovery of a comet-like tail on asteroid (3200) Phaethon when imaged at optical wavelengths near perihelion. In both 2009 and 2012, the tail appears ?350″ (2.5 × 10~8 m) in length and extends approximately in the projected anti-solar direction. We interpret the tail as being caused by dust particles accelerated by solar radiation pressure. The sudden appearance and the morphology of the tail indicate that the dust particles are small, with an effective radius ~1 μm and a combined mass ~3 × 10~5 kg. These particles are likely products of thermal fracture and/or desiccation cracking under the very high surface temperatures (~1000 K) experienced by Phaethon at perihelion. The existence of the tail confirms earlier inferences about activity in this body based on the detection of anomalous brightening. Phaethon, the presumed source of the Geminid meteoroids, is still active.
机译:我们报道了在近日点附近的光学波长成像时,在小行星(3200)Phaethon上发现了类似彗星状尾巴的发现。在2009年和2012年,尾巴的长度均为?350英寸(2.5×10〜8 m),并大致沿投影的反太阳方向延伸。我们将尾巴解释为是由太阳辐射压力加速的尘埃颗粒引起的。尾部的突然出现和形态表明尘埃颗粒很小,有效半径约为1μm,总质量约为3×10〜5 kg。这些颗粒可能是Phaethon在近日点所经历的非常高的表面温度(〜1000 K)下热破裂和/或干燥裂纹的产物。尾巴的存在基于对异常增亮的检测,证实了有关该体内活动的早期推断。 Phaethon是双子座流星体的推测来源,目前仍在活跃。

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