Arcturus – spectrum-2017-Telescope 1000mm, 190mm, Canon 70D EOS, fly screen in front of telescope.
Arcturus – 2017-Telescope 1000mm, 190mm, Canon 70D EOS, 30 sec, 800 iso
Arcturus in the constellation Bootes, is the brightest star in the northern hemispere with an apparent magnitude of -0.04 and is the closest giant star to the Earth. It is a Red Giant and will terminate its life a as White Dwarf. It is 113 times brighter than the Sun and is 1.5 times its mass. Alot of its energy is radiated as heat, releasing 215 times more radiated energy than our Sun. It radiates considerable energy in the infrared.
To find Arcturus just follow the handle of the Big Dipper…”arc to Arcturis, then speed to Spica”
The bright star to the left of Arcturus, in the above image and in the video below is CN Bootis. It is about 0.28 deg. from Arcturis with an apparent magnitude of +5.96. This Yellow-White Giant is a pulsating variable star. A relatively clear sky with a limiting magnitude of 6, may allow this star to be seen with the naked eye.
Astronomy Notebook 