(MOONS OF MARS)
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The two moons of mars are phobos and deimos they are irregular in shape.discovered by ASAPH HALL in august (1877).
and are named after the greek mythology twin character phobos (panic/fear) and deimos (terror/dread)
campared to the earth's moon,the moons phobos and deimos are small.
:)-diameter of phobos- 22.2km (13.8mi)
:)-mass of phobos- 1.8*10^16kg
:)-diameter of deimos- 12.6km(7.8mi)
:)-mass of deimos-2.0*10^15kg
:)-moon radius(earth)-1709.6mi (1737.5 km)
:)-moon diameter (earth)-2159.2mi (3475km)
:)-mass of the moon (earth)-7.347*10^22kg
THE orbitals of phobos are closer to the mars.orbitals periods of 7.66 hours,semi-major axis 9,377 km (5,827 mi)
deimos semi-major axis is 23,460 km (141580 mi) and orbitals period of 30,35 hours.
(DISCOVERY)
ASAPH HALL discovered deimos on 12 august 1877 at about 07:48 UTC and phobos on 18 august 1877,at the US naval observatory in washington,D.C.,
(TELESCOPE)
The telescope used for this discovery was the 26-inch(66cm)
refractor (telescope with lens) then located at foggy bottam.
in 1893 the lens was remounted and put in a new dome.where it remains into the 21st century.
