# Why didn Mars lose Deimos, its outermost satellite?

I think Mars did lose Deimos. But only for about 54 hours. Deimos’s mass is 1.8 e 15 kg and it orbits 23,459 km from Mars. Deimos orbits Mars in 21 and 1/2 hours. The force holding Deimos to Mars is 1.40183 e 17 newtons. The formula is gravity constant times mass Mars in kg’s times mass Deimos divided by radius of Deimos from Mars in meters squared. The Earth would have the same amount of force on Deimos when Deimos was almost 71,538 km from the Earth. At that distance it would take Deimos a little over 52.9 hours to orbit the Earth once. Mars circled the Earth almost 2 and 1/4 times while Deimos circled the Earth once. At that point Mars recaptured Deimos and proceeded on around the Sun with Deimos. Remember Deimos had an elliptical orbit as it orbited the Earth. I don’t think this slight interruption would prevent Deimos from being tidally locked to Mars. What happened to Phobos, Mars inner satellite? Phobos’s mass is 1.08 e 16 kg. It orbits 9,378 km from Mars every 10 hours. The for