A strong G3-class geomagnetic storm took place this weekend, sparking auroras over both poles of Earth. Hunter Davis, at the South Pole, captured these images.
A Communication relay building with some purple and blue auroras overhead. Photo taken May 28, 2017 by Hunter Davis.
They’re called Kelvin Helmholzt clouds, aka billow clouds or shear-gravity clouds, and they look like breaking ocean waves.
The young moon is back in the west after sunset. Very lovely, and passing near some bright stars on Sunday evening.
Radar astronomers are peering toward asteroid 2017 CS, closest on May 29. Another asteroid – 418094 (2007 WV4) – will be closest June 1. Charts here for Saturday night, for 8-inch or larger ‘scopes!
Artist's concept of a large asteroid passing Earth, via Shutterstock.