Thursday, October 23, 2014

துருவனும் சுநீதியும் நான் அவ்வப்போது படிக்கும் இணைய தளம் , துருவன் Polaris எனப்படும் , ஆக  Polaris B தான் சுநீதி .


  "If you have a small telescope and train it on Polaris, you just might notice a tiny companion star (called Polaris B) shining at 9th magnitude with a pale bluish tint. This companion was first sighted by Sir William Herschel in 1780 (just a year later, Herschel would discover the planet Uranus).  Astronomers believe that the two stars – A and B – are separated by about 2,400 astronomical units – one astronomical unit (a.u.) being the average distance of the sun to the Earth.  The orbital period of the two stars may number in the many thousands of years"