"EXOPLANETS" that you can see by interactively seeing the size, orbit, and surface temperature of extrasolar planets
On 15th September 2017, NASA's Saturn probe "Cassini" finished the last observation, rushed into Saturn's atmosphereI am about to reach the end. Human beings are advancing the planetary exploration of the solar system, but due to the progress of astronomical observation technology in recent years, the planet which is turning around a star like the Earth other than the solar system "Extrasolar planetThe existence of "has been revealed one after another. At the time of writing the article, more than 3,600 exoplanetary planets have been discovered, in which life can existAlso confirm the planets included in "Habitable zone"It is being done. The size and mass of such solar system, the surface temperature and the revolution orbit etc can be confirmed by clicking on the screen is "EXOPLANETS"is.
When opening the page, animation shows the star in the center and the round planet turning around it as shown below.
When placing the cursor on the planet, the name and information of that star will be displayed. What is displayed here is discovered in 2013HATS-2 b, The radius of the planet is 13.09 times that of the earth, and the distance from the star is "0.02 au".
"Au" stands for Astronomical Unit, which is called "astronomical unit" in Japanese. It is a unit with the distance between the earth and the sun of 150 million km as 1, and the distance between HATS - 2 b of 0.02 au and its star HATS - 2 is only 2% of the sun and the earth . Even at Mercury closest to the sun in the solar system, its distance is 0.3 au, you can see that HATS - 2 b revolves very close to a star. Therefore, it is thought that the surface temperature is extremely high, and it is seen that it is not an environment where life can exist very. By the way, the revolution cycle around a fixed star is only 1.35 days. Although this is the number of days converted into the earth's day, you can see that it is revolving at a tremendous speed by being near the fixed star.
A slightly larger planetTRES-4 bIs a planet that is 19.99 times the size of the earth, the astronomical unit is 0.05 au. The revolution cycle is 3. 55 days. By the way, although the actual size of the star in the center is uneven for each star system, on this page it is said that it is converted to the same size as the sun and displayed.
Looking at the planet far away, it is a star with 0.9 times the mass of the sunKepler-75To revolve aroundKepler-75 bIs 11.55 times the mass of the earth, the average distance from the star is 0.08 au, but you can see that the orbit draws a large circle. The revolution cycle is 8.88 days, and the eccentricity of the circular orbit is 0.569.
Furthermore, if you scrutinize the screen quite a bit, you can also see planets that orbit around in even more distant orbit.CoRoT-9 bIs 11.77 times the size of the Earth, the distance to the star is 0.41 au, the eccentricity is 0.11, and the revolution cycle is 95.27 days.
By clicking on "colorize" at the bottom of the screen, it is possible to display the effective surface temperature of the star whose each planet is orbiting. This is because the temperature of the starSpectral classificationIt is divided into "A type" from 7500K to 10000K (about 7200 to 9700 degrees Celsius) from the "K type" whose surface temperature is 3900 K (Kelvin) to 5300 K (about 3600 to 5000 degrees C).