Non-detection of lightning during the second Parker Solar Probe Venus gravity assist

2020 ◽  
Author(s):  
Marc Pulupa ◽  
Stuart D. Bale ◽  
Shannon M. Curry ◽  
William Farrell ◽  
Katherine Amanda Goodrich ◽  
...  
Keyword(s):  
Gravity Assist

scholarly journals Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Hirotomo Noda ◽  
Hiroki Senshu ◽  
Koji Matsumoto ◽  
Noriyuki Namiki ◽  
Takahide Mizuno ◽  
...  
Keyword(s):  
Altimeter Data ◽  
Gravity Assist ◽  
Laser Altimeter ◽  
Trajectory Error ◽  
Flight Data ◽  
Camera Image ◽  
Operation Period ◽  
The Cross ◽  
Along Track

AbstractIn this study, we determined the alignment of the laser altimeter aboard Hayabusa2 with respect to the spacecraft using in-flight data. Since the laser altimeter data were used to estimate the trajectory of the Hayabusa2 spacecraft, the pointing direction of the altimeter needed to be accurately determined. The boresight direction of the receiving telescope was estimated by comparing elevations of the laser altimeter data and camera images, and was confirmed by identifying prominent terrains of other datasets. The estimated boresight direction obtained by the laser link experiment in the winter of 2015, during the Earth’s gravity assist operation period, differed from the direction estimated in this study, which fell on another part of the candidate direction; this was not selected in a previous study. Assuming that the uncertainty of alignment determination of the laser altimeter boresight was 4.6 pixels in the camera image, the trajectory error of the spacecraft in the cross- and/or along-track directions was determined to be 0.4, 2.1, or 8.6 m for altitudes of 1, 5, or 20 km, respectively.

Heat pipe performance with gravity-assist and liquid overfill

1980 ◽  
Author(s):  
F. PRENGER, JR. ◽  
J. KEMME
Keyword(s):  
Heat Pipe ◽  
Gravity Assist

Gravity assists maneuver in the problem of extension accessible landing areas on the Venus surface

2021 ◽  
Vol 30 (1) ◽  
pp. 103-109
Author(s):  
Natan A. Eismont ◽  
Vladislav A. Zubko ◽  
Andrey A. Belyaev ◽  
Ludmila V. Zasova ◽  
Dmitriy A. Gorinov ◽  
...  
Keyword(s):  
Gravitational Field ◽  
Entry Angle ◽  
Gravity Assist ◽  
Flight Duration ◽  
The Earth ◽  
Gravity Assists ◽  
Primary Basis ◽  
Venusian Surface ◽  
Research Show

Abstract This study discusses the usage of Venus gravity assist in order to choose and reaching any point on Venusian surface. The launch of a spacecraft to Venus during the launch windows of 2029 to 2031 is considered for this purpose. The constraints for the method are the re-entry angle and the maximum possible overload. The primary basis of the proposed strategy is to use the gravitational field of Venus to transfer the spacecraft to an orbit resonant to the Venusian one – with the aim of expanding accessible landing areas. Results of the current research show that this strategy provides an essential increase in accessible landing areas and, moreover, may provide an access to any point on the surface of Venus with a small increase in ∆V required for launch from the Earth and in the flight duration. The comparison with the landing without using gravity assist near planet is also given.

scholarly journals Optimal atmospheric trajectory for aero-gravity assist

1994 ◽  
Vol 32 (2) ◽  
pp. 89-96 ◽  
Author(s):  
F.A. Lohar ◽  
D. Mateescu ◽  
A.K. Misra
Keyword(s):  
Gravity Assist

Set-oriented design of interplanetary low-thrust trajectories using Earth Gravity Assist

2019 ◽  
Vol 156 ◽  
pp. 208-218 ◽  
Author(s):  
Daisuke Tamakoshi ◽  
Hirohisa Kojima
Keyword(s):  
Low Thrust ◽  
Gravity Assist ◽  
Earth Gravity

Gravity assist space pruning based on differential algebra

2009 ◽  
Vol 106 (1) ◽  
pp. 1-24 ◽  
Author(s):  
R. Armellin ◽  
P. Di Lizia ◽  
F. Topputo ◽  
M. Lavagna ◽  
F. Bernelli-Zazzera ◽  
...  
Keyword(s):  
Differential Algebra ◽  
Gravity Assist

Fast Mars Free-Returns via Venus Gravity Assist

2014 ◽  
Author(s):  
Kyle M. Hughes ◽  
Peter J. Edelman ◽  
James Longuski ◽  
Mike Loucks ◽  
John P. Carrico ◽  
...  
Keyword(s):  
Gravity Assist
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