Fortune Telling Collection - Horoscope - How far is Tianjin IV and Kepler -452, both cygnus?
How far is Tianjin IV and Kepler -452, both cygnus?
How far is Cygnus from Kepler -452? There is also an invisible one-Kepler 452. However, astronomers discovered an exoplanet named "Earth 2.0" nearby, kepler-452b, so the system attracted a lot of attention. Kepler -452, like the sun, is a yellow dwarf with a mass, radius and luminosity close to the sun. For a star as bright as our sun, more than 55 light years, it is too dark to be seen by the naked eye. Kepler -452 is at least 1400 light years away from us (according to a paper by 20 18, ARXIV: 1804.065V2), so this star is invisible to the naked eye.
Tianjin IV and Kepler 452 are both in Cygnus. What is the distance between them? Tianjin IV and Kepler 452 are closely projected on the celestial sphere, but in fact they are far apart in different spaces. As for the distance between two stars, it can be calculated by trigonometry.
Because the distance between two stars and the earth is known, you can use cosine law to calculate the angular distance between two stars-their angle with the earth. The coordinates of the celestial sphere in Tianjin are: right ascension 20h 4 1m 25.9s, declination+4516' 49 ". The right ascension of Kepler -452 is 19 hours 44m 00.886 1 s, and the declination is +44 16' 39.6438+0704 ". It can be concluded that the angular distance between two stars is 10.73, and the distance between two stars can be calculated according to cosine law (c 2 = a 2+b 2-2 abcosc).
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