The dangerous moon swallow belongs to the moon and is a swallow. One of the twenty-eight constellations in Chinese mythology, the fifth of the seven constellations in the north, is at the tail of basalt. Because in war, those who break the rear are often in danger, so it is named “danger”. The following China story network editor will bring you a detailed introduction. Let’s have a look!
In the romance of gods, Hou Taiyi, who was originally named in the Central Plains, was killed in the battle of immortals array and was canonized only after his death.
Dangerous people are high, high and dangerous, so dangerous places are more fierce. In the actual sky, the constellation of danger covers a wide range, but the starlight is not too bright. The nearby constellations are all dim constellations. Therefore, Wei Su and Xu Su are listed as the star clusters of autumn.
In the 28 stars fortune telling method, Wei Yueyan is the patron saint of people whose birthdays are January 27, February 25, March 23, April 21, May 19, June 17, July 14, August 11, September 9, October 7, November 4, December 2, and December 29 in the lunar calendar.
In the twelve palaces, Wei Su belongs to the four feet of the Aquarius. This constellation is Aquarius. This constellation appeared in the middle of the southern sky at dusk in mid October, just below Pegasus and to the left of Capricorn. It covers a wide range of constellations, but the starlight is not too bright. The nearby constellations are all dim constellations, so they are juxtaposed with Xuxiu as the star clusters of autumn. It is one of the northern Xuanwu seven campuses.
Tomb one is in the Aquarius “water drop” constellation (Aquarius ?/? Aqu) a conjoined star (click here to view “water droplets”) is about 103 light-years away from the earth.
Brighter Aquarius ? 2 is a yellow and white F-shaped star with apparent magnitude +4.42. Its companion star Aquarius ? 1 is a yellow and white F-type sub giant with apparent magnitude +4.59. In fact, because the luminosity of these two stars is very close, it is easy to measure and decompose into a pair of binary stars. The combined luminosity of this pair of conjoined stars is +3.65, the distance between the two stars is 1.67 arc seconds, and the orbital period is 760 years.
Christian Meyer, the director of Mannheim Observatory, was the astronomer who first considered the tomb one as a double star. He noticed that it was a pair of stars in 1777, and William Herschel also found it two years later.
The time when the tomb was observed has only one orbital period so far. Therefore, there is no actual measurement data on the size and shape of the orbit and the orbital period. According to Martin Gaskell’s measurement in 1968, the obtained period is 856 years (this data is quoted by Norton 2000 map).
The maximum distance between the two stars in an elliptical orbit appears to be clockwise, which is four times the shortest distance (about the distance from the sun to Pluto).
The distance between the two stars on the ephemeris is 2.5 “, and its projection cycle will be completed at the end of the 23rd century. At that time, the distance between the two stars will be about 6.4”, but the change every year is very small.
The masses of these two stars are simply distinguished by a and B, which are 1.1 and 0.9 solar masses respectively. Although they are similar in quality, they are seven times brighter than our sun, which means that they are still evolving. Spectroscopic analysis shows that these two stars are sub giants, which supports the prediction that they will become red giants after the hydrogen in their cores is exhausted.
There was once a claim that a third star orbited star B with a period of 25.5 years, but this may be a simple residual, which is considered to be the possibility of a third star in the conjoined star, but the luminosity of this third star is too low to be observed directly. Conjectured Aquarius ? The third star has a mass of 0.28 of the sun, which may be a red dwarf or white dwarf. It is only 9 astronomical units away from star B, which is about the distance of solar Saturn.
Aquarius ? It is a star in the northern hemisphere. It was located on the equator of the celestial sphere in 2004, but before that, it was located in the south of the equator of the celestial sphere. Disclaimer: the above content originates from the network, and the copyright belongs to the original author. Please inform us if your original copyright is infringed, and we will delete the relevant content as soon as possible.