Monday 19 June 2017

Satellites

A satellite, possibly a Russian electronic surveillance satellite, flaring reflected sunlight .
"The night sky teems with satellites and bits of old rockets, so much so that its almost impossible to take a sequence of photographic images without one of them showing the tell-tale streak of low orbit astro-debris.  Every now and again sunlight bounces of a tumbling satellite creating a bright flare in the night sky.
 
The bright star in the right corner of the image is Alpha Bootes or Arcturus.  Arcturus is the fourth brightest star in the night sky and the brightest in the Northern hemisphere sky.  Its apparent brightness is a function of its absolute luminosity - approximately 170 times that of the Sun, its large diameter - approximately 25 times that of the Sun and its relative proximity at 36.7 light years.  Arcturus has been shining for the best part of 7 billion years or for about half the life of the Universe. Arcturus has used up its hydrogen, left the 'main sequence' and is a 'red giant'.

Just below and to the right of the flaring satellite, is a 'C' ring of stars known as the 'Northern Crown' or Corona Borealis.  The white and brightest of the stars in Corona Borealis - Alphecca  is an eclipsing binary star".  Kurt Thrust -current Director of the Jodrell Plank Observatory.


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