Image acquisitions were performed using a SD200 Spectracube system (ASI) mounted on a Zeiss Axioskop microscope (Carl Zeiss Jena GmbH, Jena, Germany) with a custom-designed optical filter (SKY-1, Chroma Technology, Brattleboro, VT, USA).
Operated by the University of Alaska at Fairbanks, PFRR hosts a suite of geospace sounding and sensing instruments including the Poker Flat Incoherent Scatter Radar (PFISR) [ Semeter et al., 2009], optical all-sky imagers (ASI) [ Hampton et al., 2013], scanning Doppler imagers [ Conde and Smith, 1997; Anderson et al., 2013], and a launch site for rocket sounding [ Zettergren et al., 2014].
Yet, according to Bohdan Paczynski, an astronomer at Princeton University, in New Jersey, current catalogues of variable stars are woefully incomplete, containing only 5% of the bright variable stars that exist.An all-sky optical monitor is also a good way to find planets around other stars.
And you definitely have to mute the TV: I found that if I had an HDMI feed into the TV, and optical out from a Sky+ box into the Sonos, the sound wasn't quite synchronised – the TV seemed to sound marginally sooner, creating an odd echo effect.
The usefulness of the algorithm is illustrated by deconvolving optical pictures of the sky taken with astronomical telescopes.
Then, they took photos of about 500 promising patches of sky with optical telescopes to search for faint groups of many galaxies.
Gravity from a galaxy between Earth and the quasar shears the quasar's light into four beams, which follow slightly different paths on their long journey through space; as a result, the quasar appears as four closely spaced spots on the sky, an optical illusion called a gravitational lens.
In addition direct sun irradiance measurements with a sun filter photometer were used to determine the aerosol optical depth on clear sky days.
Parhelion, also called Mock Sun, or Sun Dog, atmospheric optical phenomenon appearing in the sky as luminous spots 22° on each side of the Sun and at the same elevation as the Sun.
The Sloan team's discovery of a burst without gamma rays lends some support to this theory or, at least, it suggests that the correct theory must involve a narrow beam of gamma rays and a wider beam of light.But the discovery also shows how profitable it might be to monitor the whole sky with ordinary optical telescopes.
