In this article, I am talking about Mars Moons – How many moons does Mars have?. Mars has 2 Natural Satellite Phobos and Deimos. These satellites are considered to be asteroids captured by Mars. The discovery of these satellites was done by Asaph Hall in 1877. He named them after Phobos and Deimos, the sons of the Greek mythology, who were the sons of God of War. The meaning of both Phobos and Deimos is fear.
Mars moons are the smallest moons in the solar system. Phobos is slightly larger than Deimos and only rotates 3,700 miles (6,000 kilometers) from Martian surface. It revolves around Mars three times a day, Whereas more distant demos takes 30 hours for each class. Phobos is gradually moving inward, spreading up to six feet (1.8 meters) of every century. Within 50 million years, it will crash or break in Mars and build a ring around the planet.
Like Earth-Moon, Phobos and Deimos always present the same face on their planet. Both are covered with lofty, heavy and dust and loose rocks. They are among the darkest objects in the solar system. The moon appears to be made of carbon-containing rock which is mixed in ice and it can be captured on asteroids.
How many moons does Mars have?
There are two moons in Mars: Phobos and Demos. So let’s know about Phoebus and Demos.
Phobos gouged and shattered by a giant crater and was beaten with the effect of thousands of meteorites, on the way to a collision with Mars. There is no atmosphere of Phobos. This can be a captured asteroids, but some scientists show evidence refuting this theory.
Phobos is larger than Mars’s two moons and in diameter 17 x 14 x 11 miles (22 by 22 kilometers 18 kilometers). It revolves around Mars three times a day and is so close to the surface of the planet that it can not always be seen in some places on Mars.
|Orbit Period||7.7 hours|
|Orbit Distance||9,376 km|
|Surface gravity||0.0057 m/s2|
Phobos is at Mars at the rate of six feet (1.8 meters) every hundred years; At that rate, it will crash into Mars in either 50 million years or break into a ring. Its most prominent feature is a 6-mile (9.7 km) crater sticky, with its effect, streaks on the surface of the Moon are formed. Stickney was seen to be full of dust with Mars Global Surveyor, with proof of sliding beneath the surface of the slopes of Boulders.
Phobos and Demos appear to be made of C-type rock, which is similar to black colored carbonate chondrite asteroids. The comments of Mars Global Surveyor indicate that with the influence of meteorite, this small body surface has been turned into powder, some of which started landslides, leaving the dark traces that marked the steep slopes of the giant crater Given.
Observation and Exploration
The observation of Phobos from Earth is hampered by its small size and its proximity to the red planet.35 It is only visible during a limited period of time when Mars is close to opposition 36 and appears as a simple point without being possible to solve it.37 In such circumstances, it reaches the magnitude 11.6. Mars with a magnitude of -2.8 is six hundred thousand times brighter. In addition, during the opposition, Phobos has a 24.6-second arc separation from the planet, 35 making it easier to observe Deimos 38 that moves away to 61.8 seconds of arc from the disk of Mars.35
To observe it in favorable conditions, it is necessary to have a telescope of at least 12 inches (30.5 cm) .38 39 In the favorable opposition of the year 2003 it has been able to be captured even with 200 mm diameter telescopes equipped with cameras CCD An object that hides the brightness of the planet and a device for the taking of images like photographic plates or CCD, with expositions of several seconds, are elements of great help in the observation.
Demos is the smallest and most exterior of Mars’s two satellites, and the name of the smallest satellites named Demos is a character of Greek mythology. In synchronous rotation with the planet, it travels almost a spherical orbit, which is very close to the Martian Equatorial Plane in 30.3 hours: a slightly longer period than the rotation of the red planet. It is irregular in size. It has an average diameter of 12.4 km, an estimated mass of 1.4762 × 1015 kg and an average density of 1471 kg / m2. Its structure D3 and the nucleus are similar to the asteroids of the extinct comet, 4 causes serious difficulties. For those scholars who try to explain their origin.
|Orbit Period||1.3 days|
|Orbit Distance||23,458 km|
|Surface gravity||0.003 m/s2|
Observation from Earth
The observation of Deimos from Earth is hampered by its small size and its proximity to the red planet. It is only visible for a limited period of time when Mars is close to opposition and appears as a point-like object without being possible to solve it. In such circumstances, it reaches the magnitude 12.8. Phobos, in comparison, reaches the value 11.6 15 18 and Mars, a million times brighter than Deimos, the -2.8.15 In addition, Phobos and Deimos during the opposition have a separation of 24.6 and 61, 8 seconds of arc of the planet respectively. This makes it easier to observe Deimos than Phobos.18
To observe it under favorable conditions, it is necessary to have a telescope of at least 12 inches (30.5 cm), an object that hides the brightness of the planet and a device for taking images such as photographic plates or CCD, with exposures of several seconds, are elements of great help in the observation. In the perihélica opposition of the year, 2003 Phobos and Deimos have been captured with telescopes of 203 mm of diameter endowed with cameras CCD and hexagonal mask on the objective.