February 6: Conjunction of the Moon and the star Antares

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February 6: Conjunction of the Moon and the star Antares. (Astrology, Cosmos, Stars, Astros, Tarot, Horoscopes, Mysteries, Influences, Curiosities… Connect your mind with the Universe, Learn today with Dorian.)

  • Dorian, February 6, 2021
    Images Credits: EvgeniT
    Astronomical information: Moon – Antares
    Prediction: Dorian

February 6: Conjunction of the Moon and the star Antares

Hello Friends of Dorian’s Secrets!

Today, February 6, 2021, the phenomenon of the Conjunction of the Moon and the star Antares will be occurring, which will be visible before sunrise in a Southeast direction.

This phenomenon will have a maximum approach at 12:00 UTC, while the magnitude of Antares will be +1.1.


The Moon is the only natural satellite of the Earth. With an equatorial diameter of 3476 km, it is the fifth largest satellite in the solar system, while in terms of proportional size with respect to its planet it is the largest satellite: a quarter of the diameter of the Earth and 1/81 of its mass. After Io, it is also the second densest satellite. It is in synchronous relationship with the Earth, always showing the same face towards the planet. The visible hemisphere is marked with dark lunar seas of volcanic origin between the brilliant ancient mountains and the prominent astroblems.

Despite apparently being the brightest object in the sky after the Sun, its surface is actually very dark, with a reflection similar to that of coal. Its prominence in the sky and its regular cycle of phases have made the Moon an object with an important cultural influence since ancient times in language, calendar, art or mythology. The gravitational influence of the Moon produces the tides and increases the length of the day. The orbital distance of the Moon, about thirty times the diameter of the Earth, makes it appear in the sky the same size as the Sun and allows the Moon to exactly cover the Sun in total solar eclipses.

The Moon is the only celestial body in which the human being has made a manned descent. Although the Soviet Union’s Moon program was the first to reach the Moon with an unmanned spacecraft, the United States’ Apollo program conducted the only manned missions to the Earth satellite to date, beginning with the first manned lunar orbit by Apollo. 8 in 1968, and six manned lunar landings between 1969 and 1972, the first being Apollo 11 in 1969, and the last being Apollo 17. These missions returned with more than 380 kg of lunar rock, which have allowed a detailed geological understanding of the origins of the Moon (it is believed that it formed 4.5 billion years ago after a great impact), the formation of its internal structure and its subsequent history.

In 1970, the Soviet Union put the first robotic vehicle controlled from the ground on the surface: Lunojod 1. The rover was sending photographs and videos of the surface that it traveled (10 km) for almost a year.

Since the Apollo 17 mission in 1972, it has been visited only by unmanned space probes, in particular by the Soviet spacecraft Lunojod 2. Since 2004, Japan, China, India, the United States, and the European Space Agency have sent orbiters. These spacecraft have confirmed the discovery of icy water attached to the lunar regolith in craters that are in the permanent shadow zone and are located at the poles. Future manned missions to the Moon have been planned, but have not yet been launched.

The Moon remains, under the Treaty on Outer Space, free for any nation to explore for peaceful purposes.


Antares is the name of the star α Scorpii (α Sco / 21 Sco), the brightest in the constellation Scorpio with apparent magnitude +1.09 and the 16th brightest in the night sky.

Along with Aldebaran (α Tauri), Spike (α Virginis) and Regulus (α Leonis) it is among the four brightest stars near the ecliptic.

The name of Antares comes from the Greek anti Ares (Άντάρης) and means “the rival of Ares” or “the opposite of Ares” due to its reddish color, since in the night sky it rivaled the planet Mars (Ἄρης, Ares in Greek ) that passes very close to this star every 1 year and 11 months. Its distinctive reddish color has made it an object of interest in many societies of the past.

The location of the star in the center of the constellation Scorpius explains its other name, of Arabic origin, Kalb al Akrab (“the heart of the scorpion”). In Egyptian astronomy it represented the goddess Serket or Selkit, announcing the sunrise through her temples on the autumnal equinox (3700-3500 BC); Many of the Egyptian temples are oriented in such a way that the light of Antares played an important role in the ceremonies that were carried out. In ancient Persia it was one of the four “Royal Stars” and probably the Guardian of Heaven referred to as Satevis; the Corasmians called it Dharind, “the gripper,” and the Copts Kharthian, “the heart.”

The Chinese included Al Niyat (σ Scorpii) and τ Scorpii – on both sides of Antares – for their Chinese constellation Sin or Xīn, with Al Niyat being the determining star.


Antares is a red M1.5Iab class supergiant located approximately 550 light years from the solar system. It is approaching us at a speed of 3.4 km / s: this value is due both to its own motion and to the movement of the Sun around the center of the Milky Way. Its luminosity in the visible spectrum is 10,000 times greater than that of the Sun. It has a surface temperature of “only” 3,600 K, so it emits a considerable fraction of its luminosity in the infrared, its bolometric luminosity being 60,000 times greater than solar luminosity. From its temperature and luminosity, its radius can be estimated at 883 solar radii, equal to 3 AU.

If it were in the center of our solar system, its surface would stretch between the orbits Mars and Jupiter, encompassing almost the entire main asteroid belt. And if a photon were to depart from the center of the star, traveling at the speed of light, it would take 24 minutes to reach the surface. Measuring its angular diameter results in an even larger radius of 3.4 AU.

Its mass is estimated between 15 and 18 solar masses. This value, together with the fact that it is in the red supergiant stage, indicates that Antares is not very far from exploding as a spectacular supernova (which could happen in the next million years), leaving a neutron star as a remnant or a black hole. Its enormous size compared to its mass results in a very low average density, much lower than that of the Sun. Likewise, it is a pulsating semi-regular variable from whose surface a stellar wind blows, causing the star to be enveloped in a cloud of gas.

Antares forms a binary system with a bluish-white star of class B2.5, Antares B, visually separated by 3 arc seconds. The separation in space between the two stars is about 550 AU and the orbital period can be about 2500 years. The companion is magnitude +5.5 and its luminosity is 1/370 that of its bright companion, even though it is 170 times more luminous than our Sun. It has often been described as green or emerald in color — probably by a contrasting effect – and was discovered by Johann Tobias Bürg in 1819 during a lunar occultation.


Around May 31 is the best time of year to observe Antares because that is when the star is in opposition to the Sun. At that time Antares rises at sunset and sets at dawn. In this situation, it is visible throughout the night, depending, of course, on where we are on Earth.

For at least two to three weeks before and after November 30, the star is not visible by the dazzling Sun. This period is longer in the Northern Hemisphere because the star’s declination is significantly south of the celestial equator. . The star begins to be visible in the early morning, a few hours before dawn, during the months of February, March and April, and in late spring it can be seen at nightfall.

A few arc minutes southwest of Antares, the globular cluster M4 can be seen with binoculars like a cottony snowball; Through any amateur telescope it can be resolved into orange giant stars, the color of which is seen in long exposure photographs.

How does the Conjunction of the Moon and the star Antares influence the life of the Zodiacal Signs?

See Prediction by Dorian:

February 6: Conjunction of the Moon and the star Antares. (Astrology, Cosmos, Stars, Astros, Tarot, Horoscopes, Mysteries, Influences, Curiosities… Connect your mind with the Universe, Learn today with Dorian.)

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