# Can we believe the reports of visual observations of the Mars satellite Deimos during the great confrontation of 2003 through

Can we believe the reports of visual observations of the Mars satellite Deimos during the great confrontation of 2003 through a telescope with a diameter of 200 mm (Mars diameter is 6800 km, Deimos size is 10 km)?

Can. The brilliance of Mars in opposition was –2, m5. The brightness of the satellite will be weaker by 2.5 * lg (D2
M / D2 / D) = 5 * log (DM / DD) ≈14m, 5 and will be ~ 12m.
Let’s compare the obtained value with the limit for the indicated telescope. For the eye (D = 6 mm) we have a limit of 6m. Then for the telescope m = 6 + 2.5lg (D2 / T / D2 Г) = 6 + 5lg (200/6) ≈13, m5.
Addition. Near bright Mars (maximum distance ~ 1 ‘) it can be difficult to see such a faint object.

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