Monitoring near-Earth-object discoveries for imminent impactors

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http://hdl.handle.net/10138/307901

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Solin , O & Granvik , M 2018 , ' Monitoring near-Earth-object discoveries for imminent impactors ' , Astronomy & Astrophysics , vol. 616 , A176 . https://doi.org/10.1051/0004-6361/201832747

Title: Monitoring near-Earth-object discoveries for imminent impactors
Author: Solin, Otto; Granvik, Mikael
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2018-09-07
Language: eng
Number of pages: 9
Belongs to series: Astronomy & Astrophysics
ISSN: 1432-0746
URI: http://hdl.handle.net/10138/307901
Abstract: Aims. We present an automated system called neoranger that regularly computes asteroid-Earth impact probabilities for objects on the Minor Planet Center's (MPC) Near-Earth-Object Confirmation Page (NEOCP) and sends out alerts of imminent impactors to registered users. In addition to potential Earth-impacting objects, neoranger also monitors for other types of interesting objects such as Earth's natural temporarily-captured satellites. Methods. The system monitors the NEOCP for objects with new data and solves, for each object, the orbital inverse problem, which results in a sample of orbits that describes the, typically highly-nonlinear, orbital-element probability density function (PDF). The PDF is propagated forward in time for seven days and the impact probability is computed as the weighted fraction of the sample orbits that impact the Earth. Results. The system correctly predicts the then-imminent impacts of 2008 TC3 and 2014 Lambda Lambda based on the first data sets available. Using the same code and configuration we find that the impact probabilities for objects typically on the NEOCP, based on eight weeks of continuous operations, are always less than one in ten million, whereas simulated and real Earth-impacting asteroids always have an impact probability greater than 10% based on the first two tracklets available.
Subject: minor planets, asteroids: general
planets and satellites: detection
methods: statistical
ASTEROID ORBITS
CHELYABINSK
SATELLITES
RECOVERY
AIRBURST
115 Astronomy, Space science
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