please mention at least one of those observations?
Mercury's apparent magnitude is calculated to vary between −2.48 around superior conjunction and +7.25 around inferior conjunction.
Mercury (planet)
Mercury's apparent magnitude is calculated to vary between −2.48 (brighter than Sirius) around superior conjunction and +7.25 (below the limit of naked-eye visibility) around inferior conjunction. 
which planet is mercury? The smallest and innermost planet in the Solar System. can you describe its surface structure in few words? Mercury's surface is similar in appearance to that of the Moon, showing extensive mare-like plains and heavy cratering, indicating that it has been geologically inactive for billions of years is there any astronomer who visited it or had run a research on it? Yes, ancient astronomers made observations of Mercury can you name any two space probes which may have been used in its study? "Mariner 10" and "MESSENGER"
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Mercury (planet) [SEP] Observation
Mercury's apparent magnitude is calculated to vary between −2.48 (brighter than Sirius) around superior conjunction and +7.25 (below the limit of naked-eye visibility) around inferior conjunction. The mean apparent magnitude is 0.23 while the standard deviation of 1.78 is the largest of any planet. The mean apparent magnitude at superior conjunction is −1.89 while that at inferior conjunction is +5.93. Observation of Mercury is complicated by its proximity to the Sun, as it is lost in the Sun's glare for much of the time. Mercury can be observed for only a brief period during either morning or evening twilight. Mercury can, like several other planets and the brightest stars, be seen during a total solar eclipse.