2020-11-19

Please set your alarm clock, tonight, enjoy the astronomical wonders of”Double Stars with Moon”

By yqqlm yqqlm

We finally wait for you! The close encounter between the moon and the double stars, are you coming?

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On the evening of November 19th, we will enjoy the rare astronomical spectacle, which is the double stars with the moon . Jupiter and Saturn will participate in this double moon companion moon, so hurry up and set the alarm clock and go to the western night sky at night! It’s beautiful!

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Jupiter conjoins the moon

The moon will reach the same right as Jupiter, and the moon will be 2°29′ south of Jupiter. The age of the month is 4 days.

At the same time, the two planets will be very close, also known as the minimum angular distance.

In Kunming, when the twilight sky recedes, the Jupiter Moon will appear at an elevation of 37° in the southwest sky around 18:35 (CST). Then they will slowly descend towards the horizon, falling completely at 22:17, about 3 hours and 58 minutes after sunset.

The visible magnitude of the moon is -11.1, and the visible magnitude of Jupiter is -2.1, both in Sagittarius.

The two stars are far apart and cannot be seen simultaneously in an astronomical telescope, but they can be seen with the naked eye or binoculars.

Here is a chart of the angular distance and time between the moon and Jupiter.

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The moon and Jupiter will have a close encounter, they will On the fourth visible day of the moon, pass the opponent at an angle of less than 2°28′.

In Kunming, the moon and Jupiter will appear in the southwestern sky after sunset at 18:36 (China Standard Time), about 37° above the horizon. They will disappear on the horizon at 22:17, 3 hours and 58 minutes after the sun sets. The apparent magnitude of the moon is -11.1, and the apparent magnitude of Jupiter is -2.1. Both planets are in Sagittarius at this time.

They are too far away in the field of view of the telescope, but they can be observed through two eyes or a simple pair of binoculars.

During this period of time, this pair of planets will rise together in the Milky Way, which is also a wonderful connection.

Here is an image of the angular distance between the Moon and Jupiter near the closest approach time.

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Saturn will meet the moon

Tonight, the fourth new moon and Saturn will move to the same right ascension, the moon is 2°51′ south of Saturn, both Will accompany it.

At that time, the two celestial bodies will be close to each other. This phenomenon is called”Fulse/minimum angular distance (appulse)”.

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Observing from Kunming, when the sky is getting dim, you can see the pair of stars meeting in the sky at 39° southwest at around 18:36 (China Standard Time). At 22:33, they sink together below the horizon.

At this time, the moon and Saturn are both in Sagittarius, the moon is at magnitude -11.2, and Saturn is in The magnitude is 0.4.

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Because the two stars are too far apart to observe within the telescope’s field of view, we can directly watch this wonderful scene with naked eyes or binoculars.

The following is a diagram of the angular distance between the Moon and Saturn when the distance is the closest.

The close proximity of the moon and Saturn

The moon and Saturn will be close to each other at a distance of no more than 2°50′, and the moon will be four days old.

If you observe from Kunming, at 18:36 Beijing time, when the dusk fades away, the moon and Saturn can be observed. The location is 5° to the southwest horizon, and at 22:33, they will slowly fall toward the horizon.

The brightness of the moon is approximately -11.2 magnitude, and Saturn is 0.4 magnitude. Both the Moon and Saturn will be located in the Sagittarius constellation.

Because of the large distance between them, it is not recommended to use a telescope (monocular) to see it. It can be observed with naked eyes or binoculars.

At about the same time, they will also share the same right ascension—–this is called”join”.

When the moon and Saturn are the closest, their angular separation images can be obtained here.

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Related Knowledge

Saturn is the sixth planet away from the sun and the second largest planet in the solar system after Jupiter. It is a huge gas planet with an average radius of 9 times that of the Earth, but its density is only 1/8 that of the Earth. However, due to its larger size, its mass is 95 times that of the earth. Saturn is named after the god of wealth and agriculture in Roman mythology. Its astronomical symbol(♄) also symbolizes God Sickle.

Saturn’s interior is a core composed of iron nickel and rock (silicon oxide)

Its core is surrounded by deep metal hydrogen, and the middle layer is liquid hydrogen and liquid Helium, the outermost layer is gaseous. Saturn is observed to be yellowish because of ammonia crystals in the upper atmosphere. The electric current in metallic hydrogen is generally believed to form the planetary magnetic field of Saturn, which is weaker than the earth’s magnetic field. But due to its larger size, its magnetic moment is 580 times that of the earth. The strength of Saturn’s magnetic field is only about 1/20 that of Jupiter. In contrast, despite its long-standing characteristics, Saturn’s outer atmosphere is generally milder and gradually lacking. The wind speed on Saturn can reach a maximum of 1800km/h (1100mph; 500m/s), which is higher than Jupiter’s, but not reach the highest wind speed of Neptune.

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In January 2019, astronomers issued a report saying that Saturn The day above was detected as 10 hours, 33 minutes and 38 seconds, with an error of +1 minute and 52 seconds, -1 minute and 19 seconds, according to the study of Jupiter’s C ring.

In astronomy, conjunct means that two celestial bodies or spacecraft have the same right ascension or the same ecliptic longitude, usually when viewed from the earth. The 12-fold astronomical symbol is ☌ (Unicode code U+260C). This symbol is no longer used in modern astronomy, but continues to be used in astrology.

When two celestial bodies always appear close to the ecliptic, such as two planets, the moon and a planet, or the sun and a planet, it means that the objects seen in the sky are Close visually. The related term, minimum angular distance, refers to the smallest angular distance between two celestial bodies that can be seen clearly.

The conjunct can be composed of two celestial bodies in the solar system, or a celestial body in the solar system and another much distant celestial body, such as a star. Combination is an obvious optical phenomenon brought about by the viewing angle:two celestial bodies are not actually close. The union of two bright celestial bodies near the ecliptic, such as two bright planets, can be seen with the naked eye.

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The “conjunction” in astronomy refers to the observation from the earth (usually) that the right ascension or ecliptic longitude of two celestial bodies or spacecraft are the same. The astronomical symbol of the conjunction is ☌ (the universal code is U+260C), and the handwriting is () [the original text of this sentence may be missing a handwritten symbol at the end]. This symbol is no longer used in modern astronomy, but it still remains in astrology (but the author did not personally verify this).

When two celestial bodies-for example, two planets, the moon and a planet, the sun And a planet-always appearing near the ecliptic plane, which means that they can be seen very close in the sky. A related term is”appulse”, which means the smallest distance between two celestial bodies visible in the sky.

A conjunction can refer to any two celestial bodies in the solar system, or one A celestial body in the solar system and another distant celestial body, such as a star. Conjunction is a visual phenomenon from the perspective of an observer. In space, two celestial bodies are actually not close together. When this phenomenon occurs, we can observe with the naked eye that two bright stars close to the ecliptic (for example, two planets) are connected together.

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Jupiter is counted from the inside to the outside of the solar system The fifth planet is also the largest. It is a huge gaseous planet with a mass of one thousandth that of the sun, but 2.5 times the total mass of other planets in the solar system. Its solid wood star is also one of the brightest objects that can be seen in the sky with the naked eye. The understanding of it can even be traced back to some ancient civilizations before recorded history, and its name comes from the Cupid in Roman mythology. . The light reflected by Jupiter from the sun is bright enough to even illuminate the shadows of objects, and on average, it is second only to the moon and Mars in natural light-emitting objects. Jupiter is mainly composed of hydrogen, but one-fourth of its mass is helium, although only one-tenth of its molecular weight.

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It also It may have a hard core composed of heavy elements, but like other large planets, Jupiter lacks a distinct solid surface. And because of its rapid rotation characteristics, the shape of the planet has become ellipsoidal (the sphere has a slight but obvious bulge around the equator). From external observations, it can be seen that Jupiter’s outer atmosphere is divided into several zones at different latitudes, and turbulence and storms are generated along the interaction boundary. A remarkable result is the Great Red Spot, a huge storm, which was observed in a telescope for the first time in at least the 17th century, and it was widely understood. Jupiter also has a weak planetary ring system and a strong magnetosphere. It has 79 known moons, including the four large Galileo moons discovered by Galileo Galilei in 1610. Ganymede, the largest moon, has a diameter larger than that of Mercury.

Author:in-the-sky

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