Abstract
The near-Earth object (NEO) population includes both asteroids (NEAs) and comet nuclei (NECs) whose orbits have perihelion distances q<1.3 AU and which can approach or cross that of the Earth. A NEA is defined as a “potentially hazardous asteroid” (PHA) for Earth when its minimum orbit intersection distance (MOID) comes inside 0.05 AU and it has an absolute magnitude H<22 mag (i.e. mean diameter > 140 m). These are big enough to cause, in the case of impact with Earth, destructive effects on a regional scale. Smaller objects can still produce major damage on a local scale, while the largest NEOs could endanger the survival of living species. Therefore, several national and international observational efforts have been started (i) to detect undiscovered NEOs and especially PHAs, (ii) to determine and continuously monitor their orbital properties and hence their impact probability, and (iii) to investigate their physical nature. Further ongoing activities concern the analysis of possible techniques to mitigate the risk of a NEO impact, when an object is confirmed to be on an Earth colliding trajectory. Depending on the timeframe available before the collision, as well as on the object’s physical properties, various methods to deflect a NEO have been proposed and are currently under study from groups of experts on behalf of international organizations and space agencies. This paper will review our current understanding of the NEO population, the scientific aspects and the ongoing space- and ground-based activities to foresee close encounters and to mitigate the effects of possible impacts.
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Notes
We recall that the absolute magnitude can serve as a proxy for the diameter D of an asteroid, as \(D = 1329\times10{}^{-0.2H}/\sqrt{p_{V}}\), where p V is the asteroid albedo and D is expressed in km (e.g., Pravec and Harris, 2007).
From the “Earth Impact Database”, maintained by the Planetary and Space Science Centre at the University of New Brunswick, Canada. http://www.passc.net/EarthImpactDatabase/index.html.
If as a consequence of an encounter with Earth, the NEO is perturbed into an orbit of period P≈k/h years, with h and k integers, then after h periods of the asteroid k periods of the Earth have elapsed, and a “resonant return” will take place.
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Acknowledgements
We thank Richard P. Binzel (Massachusetts Institute of Technology, USA), referee of this article, as well as Alan W. Harris (Space Science Institute, USA) and Elisabetta Dotto (INAF—Osservatorio Astronomico di Roma, Italy) for their useful comments. We acknowledge support from the NEOShield project, funded by the European Commission’s Seventh Framework Programme (Contract No. FP7-SPACE-2011-282703).
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Perna, D., Barucci, M.A. & Fulchignoni, M. The near-Earth objects and their potential threat to our planet. Astron Astrophys Rev 21, 65 (2013). https://doi.org/10.1007/s00159-013-0065-4
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DOI: https://doi.org/10.1007/s00159-013-0065-4