The effects of the diurnal atmospheric variability on entry, descent and landing on Mars
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Published:2014
Issue:189
Volume:
Page:69-77
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ISSN:1450-698X
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Container-title:Serbian Astronomical Journal
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language:en
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Short-container-title:SERBIAN ASTRON J
Affiliation:
1. Faculty of Mathematics, Department of Astronomy, Belgrade
Abstract
Landing on Mars is extremely challenging task due to the fact that the
Martian atmosphere is the most hostile environment in the Solar system to
perform the entry, descent and landing (EDL) process, because it is thick
enough to create substantial heating of the entry vehicle but not thick
enough to reduce its velocity to the one necessary for safe landing. Beside
this, the atmosphere is very dynamic mainly due to high eccentricity of the
Martian orbit, obliquity of the orbital to the equatorial plane and close
alignment of the winter solstice and the orbital perihelion. Although
seasonal variations of atmospheric parameters are significantly larger than
the diurnal, it is very important to analyze diurnal cycles as they can
significantly change vertical and horizontal atmospheric profiles in very
short time intervals. This can present a serious threat to missions which
have very precise timings and specific requirements such as the requirement
for the daytime landing to enable ground images acquisition during the
descent and landing phase. A 3-degrees-of-freedom trajectory integration
routine was combined with the Mars Global Reference Atmospheric Model
(Mars-GRAM) to identify the dependence of the EDL profiles on the diurnal
cycles of atmospheric parameters throughout the Martian year. The obtained
results show that the influence of the diurnal cycles is the largest at the
equator and decreases relatively symmetrically towards the poles with a
slightly stronger influence in the northern hemisphere. Also, there is a
significant influence of the orbital position of Mars on the effect of
diurnal atmospheric variations which causes that, around the orbital
perihelion and winter solstice, there is some kind of inversion of the
dependance of optimal entry timing on latitude of the landing site comparing
to the rest of the Martian year.
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
Subject
Astronomy and Astrophysics
Cited by
1 articles.
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1. Landing on Mars;Tehnika;2019