North Star 🌟

-
Polaris, also called Alpha Ursae Minoris, Earth’s present northern polestar, or North Star, at the end of the “handle” of the so-called Little Dipper in the constellation Ursa Minor.
https://drive.google.com/uc?export=view&id=194YILfZStKMMKi13NBmP8IMUwgBoEZiX

 It’s classed as supergiant star, which can be red or blue (North Star is light blue).  Pole Star is a visual double star which can be observed only with the help of very large telescopes. 
https://drive.google.com/uc?export=view&id=1obHFMaTwuZsTDSDL4hQssMGozGlyzFVU

Thanks to its high brightness, Polaris is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas. Pole Star is famous for holding nearly still in our sky while the entire northern sky moves around it. That’s because it’s located very close to the north celestial pole, the point around which the entire northern sky turns. 
https://drive.google.com/uc?export=view&id=19LHdwTcQUXuJ16ZHt4aWwIIO75K6v0yW

Althoug  it’s a common belief, Polaris is not the brightest star in the nighttime sky. In fact, it’s only the 48th brightest star. 
North Star is distant 431.22 light years from the Sun and it is moving towards it at the speed of 17 kilometers per second. —————————————————————

http://spider.seds.org/spider/Misc/alphaUMi.htmlhttps://www.star-facts.com/polaris/
https://science.nasa.gov/solar-system/skywatching/what-is-the-north-star-and-how-do-you-find-it/

Comments

  1. englishdiaryOctober 29, 2023 at 11:07 PM

    How was this last picture taken? Does it reflect the movement of the earth in time?

    ReplyDelete

Post a Comment

Popular posts from this blog

TRAPPIST-1

-
Image
TRAPPIST-1  is a cool red dwarf star  with seven known exoplanets . It lies in the constellation Aquarius  about  40.66 light years  away from Earth .  The system is far too faint to be seen with the unaided eye.  Around a star which is 12 times less massive than the Sun and only slightly larger than Jupiter, there are at least seven planets in orbit. They  have sizes and masses comparable to the Earth and Venus.  Because we know the distance of the planets to their star, and the temperature of the star, we can deduce that they receive an amount of light that is similar to many of the planets in the Solar system, from Mercury to Mars.  Three or four of them reside within their star's habitable zone, meaning they orbit at the right distance to support liquid water on their surfaces .   TRAPPIST stands for "Transiting Planets and Planetesimals Small Telescope," which is actually a pair of telescopes: one at the European Sout...
Read more

The Sun

-
Image
The sun is an ordinary  star , one of about 100 billion in our   galaxy , the Milky Way. The sun has extremely important influences on our planet: It drives weather, ocean currents, seasons, and  climate , and makes plant life possible through  photosynthesis . Without the sun’s heat and light, life on Earth would not exist. The Sun moves around the Galactic Center  of the Milky Way , at a distance of 26,660 light years . From Earth, it is  about 8 light minutes  away. It’s diameter  is about 109 times that of Earth . It’s mass  is about 330,000 times that of Earth, making up about 99.86% of the total mass of the Solar System.  Roughly three-quarters of the Sun's mass  consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen , carbon , neon , and iron . The sun was born about 4.6 billion years ago. Many scientists think the sun and the rest of the solar system ...
Read more

Cat’s eye nebula 🌌

-
Image
The Cat’s Eye Nebula, also known as NGC 6543, is a planetary nebula located 3,000 lightyears away in the constellation Draco.  Planetary nebulae are one of the final stages of a Sun-like star, as they run out of fuel and begin losing their outer layers into space.   The Sun will end its life in similar fashion in about five billion years. It will first expand into a red giant with a diameter about 100 times greater than it originally was. At the centre of the Cat's Eye Nebula is a dying Wolf Rayet star.  The star is believed to have originally had a mass of around 5 times that of the Sun and is now estimated to have only over one solar mass.  Wolf-Rayet stars are hot (25-50,000+ degrees K), massive stars (20+ solar mass) with a high rate of mass loss. Th e type was first distinguished in 1867 by the French astronomers  Charles-Joseph-Étienne Wolf and   Georges-Antoine-Pons Rayet. Credits:  https://m.youtube.com/watch?v=Gis6G2hVNaE https://hubblesite.or...
Read more