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Context. Near-Earth objects (NEOs) typically end their existence by falling into the Sun. Because the orbit evolution timescale is long, however, it is unlikely that we will witness such events or predict them happening in a foreseeable future. Aims. We studied the orbital dynamics of NEOs to understand whether predictions of Sun impact are possible for individual bodies, and if so, whether special cases can be identified where the Sun impact is expected to happen in 50% over the next 100 ky. 2004 LG was exposed to extreme solar radiation in the past and will be exposed to even more extreme solar radiation in the future. For example, we found that 2004 LG was approaching the Sun to within only 5.6 solar radii some 3 ky ago, and its surface was baked at temperatures 2500 K. Spectroscopic observations of 2004 LG would therefore be useful in characterizing the effects of extreme irradiation on NEOs’ surfaces. Our forward orbital integrations showed that 2004 LG will reach a very low orbital perihelion distance (<1.6 solar radii) at 9 ky from now, indicating its surface will be scorched at temperatures exceeding 4500 K while the interior will be exposed to strong solar tides and thermal stresses. The object will probably not maintain its physical integrity.

Sun-grazing orbit of the unusual near-Earth object 2004 LG