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Phobos orbits closer to Mars, with a semi-major axis of 9,377 km (5,827 mi) and an orbital period of 7.66 hours; while Deimos orbits farther with a semi-major axis of 23,460 km (14,580 mi) and an orbital period of 30.35 hours.
20 mar 2017 · Deimos, lying outside the synchronous orbit of Mars (located at ∼ 6 Mars radii) is subject to tidal torques that cause its semi-major axis to increase over time.
22 lut 2021 · Whereas Deimos is very slowly receding from Mars, Phobos will continue to spiral towards and either impact with Mars or become tidally disrupted on reaching the Roche limit in ≲39 Myr.
29 lis 2021 · Adding a substantial constraint to the capture model, Phobos is continuing to lose altitude in the present day (Shi et al. 2013), and when the orbital decay process is computationally run back in time, it is far more likely that Phobos has always orbited Mars, starting just below the synchronous altitude of Mars (Lambeck 1979; Canup and Salmon ...
10 cze 2021 · Degree 2 is the greatest tide with a period of 5.55 h, followed by degree 3 with a period of 3.70 h and then degree 4 with a period of 2.78 h. This tidal forcing from Phobos distorts the shape of Mars, creating displacements, changes in gravitational potential, and variations of surface gravity.
12 maj 2020 · This chapter describes the discovery of the two moons of Mars, Phobos and Deimos, made in 1877 by Asaph Hall using the giant 26-in. refractor at the U. S. Naval Observatory. Subsequent research over the next century is briefly highlighted, most notably the secular...
A transit of Deimos from Mars lasts a maximum of about two minutes, due to its relatively rapid orbital period of about 30.3 hours.. Because they orbit Mars in low-inclination equatorial orbits, the shadows of Phobos or Deimos projected onto the surface of Mars exhibit a seasonal variation in latitude. At any given geographical location on the surface of Mars, there are two intervals in a ...
