Don’t Miss Tonight, The Conjunction of the Moon and the Interstellar Multiple Stars Like Mars Page all


KOMPAS.com- At the end of April 2021, the phenomenon of the conjunction sky between the Moon and Antares will be present to decorate the sky tonight, Wednesday (28/4/2021).

Based on official information from the National Aeronautics and Space Agency (LAPAN), the Moon-Antares conjunction occurred twice throughout April 2021.

The first time, the conjunction or parallels between the Moon and Antares occurred on April 1-2, 2021. The peak of the conjunction occurred on April 2 at 03.49 WIB.

Delivered by a researcher at the LAPAN Space Science Research Center, Andi Pangerang Hasanuddin, said that the Moon-Antares conjunction event can occur twice a month due to the sidereal period of the Moon for 27.32 days.

For this second event, it will be present starting tonight, precisely starting at 20.00 local time, it can be seen from the East-Southeast direction.

Also read: What is a lunar conjunction?

This phenomenon of the conjunction of the moon and star Antares will last until the next morning, when the maritime dawn ends from the West-Southwest direction.

Meanwhile, the peak of the Moon-Antares conjunction itself will occur at noon at 13.07 WIB, Thursday (29/4/2021). So, this phenomenon will indeed occur on April 28-29, 2021.

“Conjunctions on the second day can be observed at the same time and direction,” said Andi.

For information, the angle of separation between the two celestial bodies varies considerably, namely between 12.35 degrees to 8.28 degrees for the first day.

Also read: Today’s Sky Phenomenon, Shadowless Day and Moon-Antares Conjunction

Then, on the second day, the separation was between 6.22 degrees and 9.16 degrees. With the lunar illumination fraction varies from 96.7 percent to 95.5 percent, when the Moon is shrinking or the final convex on the first day.

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Meanwhile, the magnitude or brightness of Antares is +1.05. Meanwhile, the lunar illumination fraction on the second day is between 91.1 percent to 89.1 percent.

Antares is the 15th brightest star after Aldebaran. This one star is called Alpha Scorpii because it is located in the constellation Scorpius.

The double star, which will meet the Moon in lunar conjunction tonight, is said to be similar to the planet Mars. Antares is a double star consisting of two stars, namely Alfa Scorpii A and Alfa Scorpii B.

Also read: There is Aldebaran, Do not Miss the Triple Conjunction of the Moon, Mars, Aldebaran this evening

SHUTTERSTOCK/Jose L. Stephens Triple illustration of the Moon-Mars-Aldebaran conjunction. This celestial phenomenon will occur this week, March 19, 2021.

The name Antares comes from the Ancient Greek ‘Antares’, which means the opposite of Ares (Mars) or anti-ares.

Andi explained, this naming was due to the reddish hue that was similar to the Planet Mars, and this similarity had been known to astronomers since the Mespotamian era.

Antares is about 550 light years from the Sun and is located south of the celestial equator with Asensiorekta coordinates 16 hours 29 minutes 24.46 seconds and declination -26 25 ‘55.21 “.

Andi said, this ink never sets for observers at latitude 63.5 LS or more and never appears for observers at latitude 63.5 latitude or more.

Regarding the double stars Alfa Scorpii A and B, Andi explained that there are differences between the two, namely as follows.

Alpha Scorpii Star A.

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Alfa Scorpii A is a slow, irregular variable star whose visual brightness varies from +0.6 to +1.6.

Also read: There is Aldebaran, Do not Miss the Triple Conjunction of the Moon, Mars, Aldebaran this evening

This first category is classified into the M1,5Iab-Ib spectrum class, which indicates that this star is a red supergiant.

This star is 680 times the size of the Sun in a +/- 19 percent variation with a mass varying from 11 to 14.3 times the mass of the Sun.

Alpha Scorpii Star B

In contrast to Alfa Scorpii A, Alfa Scorpii B is not called a red giant.

Alfa Scorpii B is a type B main sequence star whose visual brightness or magnitude is +5.5 and is classified into the B2.5V spectrum class.

The star Alpha Scorpii B is only about 5.2 times the mass of the Sun and 7.2 times the mass of the Sun.

Also read: Starting tonight, the Moon-Mars conjunction decorates Indonesia’s skies

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