The History of Phobos and Deimos

The history of Phobos and Deimos

The two moons of Mars are Phobos and Deimos.

Phobos is a greek word for “fear” and
Deimos is a greek word for “panic”
They were discovered by American astronomer
Asaph Hall in August/18/1877

 

Asaph Hall used a telescope from
the united states navel observatory

Asaph Hall used a telescope that gave
him 67 times magnification power.

Facts About Phobos

Facts About Phobos

Phobos is the closest moon to Mars.
Phobos periapsis distance from mars’s center is 9,235.6 km (5,738.7 miles).
Phobos apoapsis distance from mars’s center is 9,518.8 km (5,914.7 miles).
Phobos average distance from mars’s center is 9,377.2 km (5,826.7 miles).
Phobos average distance from mars’s surface is 5981 km (3,716.4miles).

Phobos Axial tilt is 0° (the rotational axis is perpendicular to orbital plane.)
Phobos has a synchronous rotation. Phobos always shows its same face to Mars.
Phobos average orbital speed is 2.138 km/s (1.328 mi/s) 7011.8 ft/s 7696.8 km/h (4780.8 mph).
that’s 6.3 times the speed of sound. twice as fast as the Lockheed SR-71 Blackbird.
Phobos orbits around mars in 7 hours 39 minutes and 12 seconds .
Phobos rises in the west every 11 hours and 6 minutes .

 

Phobos is getting closer to mars’
Phobos is gradually spiraling inward, drawing about 1.8 meters closer to the planet each century. for when its orbital
It is estimated that Phobos will pass the Roche limit
radius drops by a little over 2,000 kilometers (1,200 mi) to about 7,100 kilometers (4,400 mi).
Newer calculations suggests Phobos will reach the Roche limit in 7.6 million years.

Phobos will ether crash into mars.

 

Or Phobos break up in to pieces and mars will have rings.

If man gave Phobos rings this what it would probably looks like.



Phobos apparent magnitude is 11.3
Phobos is 32,211 times fainter than Vega(0.03 magnitude).
Phobos is 4,875,284,830 times fainter than our full moon(-12.92 magnitude).
Phobos albedo is 0.071
Phobos absorbs 92.9% sun light just like asphalt.
Phobos ~233°K(-40.27°F)(-40.15°C)
Shadow side
Min 161°K(-170°F)(-112°C).
Sunlit side
Max 269.26°K(25°F)(-4°C).
Phobos composition is very similar to C- or D-type asteroids
similar to carbonaceous chondrite material.Phobos diameter or Phobos Dimensions are 26.8 km (16.8 mi) x 22.4 km (13.9 mi) x 18.4 km (11.4 mi).
Mean radius 11.1 km (6.9 mi).

Phobos Surface area is 6,100 km² (2400 sq mi)
Phobos volume is 5680 km³ (1360 cu mi)
Phobos mean density is 1.876 g/cm³
Phobos mass is 1.072 × 10¹⁶ kg
Phobos Escape velocity is (40 km/h) 24.85 mph
Phobos surface gravity is 0.0084–0.0019 m/s² ok!
A 200 pound person would weigh 2.7 ounces to 0.62 ounces on phobos
If Phobos had an object in free fall or have its own moon, an object that is 8.4 miles from the center of phobos would take 10 hours and 15minutes to go around Phobos. The object would go 5.14 miles an hour.







Facts About Deimos

Facts About Deimos

Deimos is the 2^nd moon from Mars.
Deimos distance from mars is 23,460 km (14,580 mi).
Deimos has a synchronous rotation. Phobos always shows its same face to Mars.
Deimos average orbital speed is 1.35 km/s 4860 km/h (3,019.86 mph).
Deimos orbits around mars in 1 day 6 hours and 18 minutes.
Deimos rises in the east every 5 days 8 hours 7 minutes and 17 seconds.

 

Deimos apparent magnitude is 12.4 ok!
Deimos is 88,715.6 times fainter than Vega(0.03 magnitude)
Deimos is 13,427,649,400 times fainter than our full moon(-12.92 magnitude)
Deimos albedo 0.068
Deimos absorbs 93.2% sun light just like asphalt.
Deimos is very similar to those of C- or D-type asteroids.
Deimos diameter or Deimos Dimensions are 15 km (9.3 mi) × 12.2 km (7.6 mi) × 10.4 km (6.5 mi)
Mean radius 6.2 kilometres (3.9 mi)

This is how big the space station and Apollo 11 would look compared to Deimos.

Deimos volume is ~(1,006 ± 10) km³
Deimos mean density is 1.471 g/cm³
Deimos mass is 1.48 × 10¹⁵ kg
Deimos escape velocity is 20 km/h (12.4 mph)
Deimos surface gravity is 0.0039 m/s² ok!A 200 pound person would weigh 1.3 ounces (36 grams)
If Deimos had an object in free fall or have its own moon, an object that is 4.65 miles from the center of Deimos, it would take 11 hours and 21 minutes to go around Deimos. And the object would go 2.57 miles an hour.

Mars Moons Gallery

Mars Moons Gallery

NASA has gotten images of Phobos and Deimos from Mariner 9, Viking 1, Mars Global Surveyor.
ESA has gotten photos of Phobos and Deimos from Mars Express.

On May 30, 1971 Mariner 9 was launched towards Mars.


 

Mariner 9 took these pictures of the two moons Phobos and Deimos.

On August 20, 1975 Viking 1 was launched towards Mars.



 

Viking 1 took these images of the two moons Phobos and Deimos.


 

On November, 1996 Mars Global Survey was launched towards Mars.


 

Mars Global Surveyor took these photos of the two moons Phobos and Deimos.

On June 2, 2003 Mars Express was launched towards Mars.



 

Mars Express took this picture of Phobos and Deimos together.

 

Mars Express took these pictures of Phobos.

Mars Express took these 3D images of Phobos.
The first 2 pictures at the top require 3D glasses.
The bottom 4 photos require the eyes to be crossed(stereo view).

For more photographs or info go to www.nasa.gov or go to www.esa.int

Make your own Mars moons globes.

Make a Phobos globe


 

or make a Deimos globe.