Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NELIOTA Lunar Impact Flash Detection and Event Validation   NELIOTA (NEO Lunar Impacts and Optical TrAnsients) is an ESA-funded lunar
monitoring project, which aims to determine the size-frequency distribution of
small Near-Earth Objects (NEOs) via detection of impact flashes on the surface
of the Moon. A prime focus, high-speed, twin-camera system providing
simultaneous observations in two photometric bands at a rate of 30
frames-per-second on the 1.2 m Kryoneri telescope of the National Observatory
of Athens was commissioned for this purpose. A dedicated software processes the
images and automatically detects candidate lunar impact flashes, which are then
validated by an expert user. The four year observing campaign began in February
2017 and has so far detected more than 40 lunar impact events. The software
routinely detects satellites, which typically appear as streaks or dots
crossing the lunar disk. To avoid confusing these events with real flashes, we
check different available catalogs with spacecraft orbital information and
exclude spacecraft identifications.

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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex