2003 HT42's 12-day observing arc
2003 HT42 is a tiny asteroid estimated at about 35-45 meters/yards wide that travels almost entirely inside Earth's orbit. MIT's LINEAR survey program caught it on April 29th in the constellation Libra during a rare appearance in night skies. Over the next 12 days, observers measured HT42's progress across Hydra as it fell behind Earth and then disappeared Sunward. It had come to within six lunar distances on the best viewing opportunity of this century.
Click for 2003 HT42 JPL orbit viewer
The chart at top is a simple 1:1 spherical "projection" with a one-degree grid. By comparison, Rafael Ferrando's May 1st blink pair at right covers about a third of a degree square.
Blink pair from Pla D'Arguines May 1st, half size
Participating observatories
176 - Consell - Mallorca
246 - KLENOT - Czech Republic
428 - Reedy Creek - Australia
474 - Mt. John - New Zealand
651 - Grasslands - Arizona
704 - LINEAR - New Mexico
854 - Sabino Canyon - Arizona
926 - Tenagra II - Arizona
941 - Pla D'Arguines - Spain
E14 - Ngunnawal - Australia
H72 - E.L. Egan - Florida

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