The NASA Goddard CO2 Sounder Lidar: 2017 Airborne Campaign as a Demonstration toward a Future Space Mission

2021 ◽  
Author(s):  
Jianping Mao ◽  
James B. Abshire ◽  
S. Randy Kawa ◽  
Haris Riris ◽  
Xiaoli Sun ◽  
...  
Keyword(s):  
Space Mission ◽  
Future Space

scholarly journals An elastic model of Phobos’ libration

2020 ◽  
Vol 636 ◽  
pp. A27
Author(s):  
Yongzhang Yang ◽  
Jianguo Yan ◽  
Xi Guo ◽  
Qingbao He ◽  
Jean-Pierre Barriot
Keyword(s):  
Numerical Model ◽  
Gravity Field ◽  
Numerical Integration ◽  
Elastic Properties ◽  
Rotational Motion ◽  
Space Mission ◽  
Elastic Model ◽  
Shape Model ◽  
Future Space ◽  
Least Squares Fit

Context. Study the rotation of a celestial body is an efficient way to infer its interior structure, and then may give information of its origin and evolution. In this study, based on the latest shape model of Phobos from Mars Express (MEX) mission, the polyhedron approximation approach was used to simulate the gravity field of Phobos. Then, the gravity information was combined with the newest geophysical parameters such as GM and k2 to construct the numerical model of Phobos’ rotation. And with an appropriate angles transformation, we got the librational series respect to Martian mean equator of date. Aims. The purpose of this paper is to develop a numerical model of Phobos’ rotational motion that includes the elastic properties of Phobos. The frequencies analysis of the librational angles calculated from the numerical integration results emphasize the relationship between geophysical properties and dynamics of Phobos. This work will also be useful for a future space mission dedicated to Phobos. Methods. Based on the latest shape model of Phobos from MEX mission, we firstly modeled the gravity field of Phobos, then the gravity coefficients were combined with some of the newest geophysical parameters to simulate the rotational motion of Phobos. To investigate how the elastic properties of Phobos affect its librational motion, we adopted various k2 into our numerical integration. Then the analysis was performed by iterating a frequency analysis and linear least-squares fit of Phobos’ physical librations. From this analysis, we identified the influence of k2 on the largest librational amplitude and its phase. Results. We showed the first ten periods of the librational angles and found that they agree well with the previous numerical results which Phobos was treated as a perfectly rigid body. We also found that the maximum amplitudes of the three parameters of libration are also close to the results from a rigid model, which is mainly due to the inclination of Phobos and moments of inertia. The other amplitudes are slightly different, since the physics contained in our model is different to that of a previous study, specifically, the different low-degree gravity coefficients and ephemeris. The libration in longitude τ has the same quadratic term with previous numerical study, which is consistent with the secular acceleration of Phobos falling onto Mars. We investigated the influence of the tidal Love number k2 on Phobos’ rotation and found a detectable amplitude changes (0.0005°) expected in the future space mission on τ, which provided a potential possibility to constrain the k2 of Phobos by observing its rotation. We also studied the influence of Phobos’ orbit accuracy on its libration and suggested a simultaneous integration of orbit and rotation in future work.

scholarly journals Acoustic in-ice positioning in the Enceladus Explorer project

2014 ◽  
Vol 55 (68) ◽  
pp. 253-259 ◽  
Author(s):  
Dmitry Eliseev ◽  
Dirk Heinen ◽  
Klaus Helbing ◽  
Ruth Hoffmann ◽  
Uwe Naumann ◽  
...  
Keyword(s):  
Space Mission ◽  
Positioning System ◽  
Test Scenario ◽  
Full System ◽  
Ice Surface ◽  
Curved Trajectories ◽  
Future Space ◽  
Glacier Ice ◽  
Taylor Glacier ◽  
Acoustic Positioning

AbstractThe Enceladus Explorer project is a preparatory study for a future space mission to Saturn’s moon, Enceladus. Its ultimate goal is to probe liquid-water pockets below the ice surface of Enceladus for signatures of life. A probe could be based on the IceMole concept, which melts curved trajectories through the ice. In the Enceladus Explorer project, a specialized IceMole probe for a terrestrial test scenario is in development. The goal of this exploratory study is to probe water from a liquid crevasse close to Blood Falls at Taylor Glacier, Antarctica. To navigate such a probe it is essential to be able to determine its position and monitor its trajectory. Part of the navigation system is the in-ice acoustic positioning system. For this, the head of the IceMole is equipped with acoustic sensors, which receive signals from synchronized acoustic emitters situated at the ice surface. Based on the measured propagation times, the speed of sound in ice and the positions of the emitters at the surface, the position of the IceMole can be determined by trilateration techniques. Here we present the developed acoustic positioning system, which is designed to track the in-ice melting probe up to distances of 100 m in glacier ice. Results from full-system tests in water and a first field test on Morteratschgletscher, Switzerland, are discussed.

scholarly journals Sealed operation, and circulation and purification of gas in the HARPO TPC

2018 ◽  
Vol 174 ◽  
pp. 05002 ◽  
Author(s):  
M. Frotin ◽  
P. Gros ◽  
D. Attié ◽  
D. Bernard ◽  
V. Dauvois ◽  
...  
Keyword(s):  
Time Projection Chamber ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Complete Recovery ◽  
Space Mission ◽  
Mode Operation ◽  
Future Space ◽  
Purification System ◽  
Gas Circulation ◽  
Time Projection

HARPO is a time projection chamber (TPC) demonstrator of a gamma-ray telescope and polarimeter in the MeV-GeV range, for a future space mission. We present the evolution of the TPC performance over a five month sealed-mode operation, by the analysis of cosmic-ray data, followed by the fast and complete recovery of the initial gas properties using a lightweight gas circulation and purification system.

Recreational Preferences in Potential Space Crew Populations

1971 ◽  
Vol 13 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Edward W. Karnes ◽  
J. Kirby Thomas ◽  
Leonard A. Loudis
Keyword(s):  
Leisure Time ◽  
Rating Scale ◽  
Space Mission ◽  
Time Preferences ◽  
Potential Space ◽  
Time Activity ◽  
Leisure Time Activity ◽  
Future Space ◽  
Potential Sources ◽  
Military Pilots

Leisure-time preferences were surveyed in three populations which are potential sources for future space crews. A questionnaire was designed to provide rating scale measures of preferences for various spacecraft recreational equipment items, leisure-time activity categories, content within activity categories, and various kinds of snack items. The questionnaire was administered to samples from three populations: test pilots, military pilots, and aerospace engineers and scientists. Statistical analyses of the obtained data indicated that preferences for types of spacecraft leisure-time equipment were similar in the three populations. However, certain significant differences were obtained among the populations in terms of the amount of time spent in earthbound leisure-time activities. Implications for space mission off-duty concepts are discussed.

scholarly journals Rosetta CONSERT Data as a Testbed for In Situ Navigation of Space Probes and Radiosciences in Orbit/Escort Phases for Small Bodies of the Solar System

2021 ◽  
Vol 13 (18) ◽  
pp. 3747
Author(s):  
Mao Ye ◽  
Fei Li ◽  
Jianguo Yan ◽  
Alain Hérique ◽  
Wlodek Kofman ◽  
...  
Keyword(s):  
Solar System ◽  
Real Time ◽  
Autonomous Navigation ◽  
Space Mission ◽  
Observation Time ◽  
Small Bodies ◽  
Tracking Station ◽  
Future Space ◽  
Comet 67P

Many future space missions to asteroids and comets will implement autonomous or near-autonomous navigation, in order to save costly observation time from Earth tracking stations, improve the security of spacecraft and perform real-time operations. Existing Earth-Spacecraft-Earth tracking modes rely on severely limited Earth tracking station resources, with back-and-forth delays of up to several hours. In this paper, we investigate the use of CONSERT ranging data acquired in direct visibility between the lander Philae and the Rosetta orbiter, in the frame of the ESA space mission to comet 67P/Churyumov-Gerasimenko, as a proxy of autonomous navigation and orbitography science capability.

scholarly journals Earth Observation via Compressive Sensing: The Effect of Satellite Motion

2022 ◽  
Vol 14 (2) ◽  
pp. 333
Author(s):  
Luca Oggioni ◽  
David Sanchez del Rio Kandel ◽  
Giorgio Pariani
Keyword(s):  
Compressive Sensing ◽  
Space Mission ◽  
Design Guidelines ◽  
Earth Observation ◽  
Moving Frames ◽  
Reconstruction Algorithms ◽  
The Earth ◽  
Future Space ◽  
Static Images ◽  
Acquisition Strategy

In the framework of earth observation for scientific purposes, we consider a multiband spatial compressive sensing (CS) acquisition system, based on a pushbroom scanning. We conduct a series of analyses to address the effects of the satellite movement on its performance in a context of a future space mission aimed at monitoring the cryosphere. We initially apply the state-of-the-art techniques of CS to static images, and evaluate the reconstruction errors on representative scenes of the earth. We then extend the reconstruction algorithms to pushframe acquisitions, i.e., static images processed line-by-line, and pushbroom acquisitions, i.e., moving frames, which consider the payload displacement during acquisition. A parallel analysis on the classical pushbroom acquisition strategy is also performed for comparison. Design guidelines following this analysis are then provided.

scholarly journals Predictions on the Number of Variable Stars for the GAIA Space Mission and for Surveys such as the Ground-Based International Liquid Mirror Telescope

2000 ◽  
Vol 176 ◽  
pp. 71-72 ◽  
Author(s):  
Laurent Eyer ◽  
Jan Cuypers
Keyword(s):  
Time Series ◽  
Space Mission ◽  
Variable Stars ◽  
Photometric Data ◽  
Huge Number ◽  
Future Space ◽  
Survey Instruments ◽  
Mirror Telescope ◽  
Stars Survey

AbstractFuture space and ground-based survey programmes will produce an impressive amount of photometric data. The GAIA space mission will map the complete sky down to V = 20m, and produce time series for about 1 billion stars. Survey instruments such as the International Liquid Mirror Telescope will observe slices of the sky down to V = 23m. In both experiments, the opportunity exists to discover a huge number of variable stars. Predictions of the expected total number of variable stars and the number of variables in specific subgroups are given.

Performance simulations tools for Space Telescopes applied to Ariel space mission.

2021 ◽  
Author(s):  
Lorenzo V. Mugnai ◽  
Enzo Pascale ◽  
Billy Edwards ◽  
Andreas Papageorgiou ◽  
Subhajit Sarkar
Keyword(s):  
Software Architecture ◽  
Time Domain ◽  
Data Reduction ◽  
Time Scale ◽  
Space Mission ◽  
Space Telescopes ◽  
Space Instruments ◽  
Future Space ◽  
Candidate Target ◽  
Early Phases

<p>Since the very early phases of designing and developing space instruments, we need fast and reliable tools to validate and optimise the projects. In the framework of the Ariel Space Mission, we developed novel, versatile tools to estimate space instruments performance. </p> <p>ExoSim, a transiting exoplanet observation simulator, is a time domain simulator for space telescopes, that has been developed inside the Ariel framework, but already adapted to both HST and JWST, proving its versatility and its capability to accurately predict science products. It can be used to develop the data reduction pipeline, and to optimise systematics removal techniques.</p> <p>ArielRad, the Ariel radiometric model, is a simulator able to accurately predict the telescope performance in observing a candidate target for all the mission photometric and spectroscopic channels. The software inputs are a target description and a parameterization of the payload, allowing the investigation of different design performance. The software is also able to simulate entire target lists, predicting the observing time and the resulting SNR vs wavelength. Analysing 1000 candidate targets in a 20 minutes time scale, it allows the validation of different observational strategies. The software architecture is based on ExoRad 2, that is publicly available and can be easily adapted to perform the same tasks for other future space missions.</p>

Sign in / Sign up

Export Citation Format

Share Document