Spatial chronogram to detect Phobos eclipses on Mars with the MetNet Precursor Lander

Romero, P.; Barderas, Gonzalo; Vázquez-Poletti, José Luis; Llorente, Ignacio

doi:10.1016/j.pss.2011.06.020

Cited by 7 publications

(7 citation statements)

References 20 publications

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“…We focused on a critical application used by the FinnishRussian-Spanish future Mission to Mars [14], which calculates the trajectories of Phobos [25], the Martian moon. Pertaining to the parameter sweep execution profile, the application divides the overall tracing interval in subintervals that are calculated by the subsequent tasks in the cloudthus the tracing interval of a task is not related to its execution time.…”

Section: Validation Of Icancloudmentioning

confidence: 99%

iCanCloud: A Flexible and Scalable Cloud Infrastructure Simulator

et al. 2012

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Simulation techniques have become a powerful tool for deciding the best starting conditions on pay-as-you-go scenarios. This is the case of public cloud infrastructures, where a given number and type of virtual machines (in short VMs) are instantiated during a specified time, being this reflected in the final budget. With this in mind, this paper introduces and validates iCanCloud, a novel simulator of cloud infrastruc-tures with remarkable features such as flexibility, scalability, performance and usability. Further-more, the iCanCloud simulator has been built on the following design principles: (1) it's targeted to conduct large experiments, as opposed to oth-ers simulators from literature; (2) it provides a flexible and fully customizable global hypervisor for integrating any cloud brokering policy; (3) it reproduces the instance types provided by a given cloud infrastructure; and finally, (4) it contains a user-friendly GUI for configuring and launching simulations, that goes from a single VM to large cloud computing systems composed of thousands of machines.Keywords Cloud computing · Cloud computing simulator · Cloud hypervisor · Validation · Scalability 1 to solve a given computational problem. If the same software and configurations are needed, the VMs may be started using the same image. This way, a machine offered by a computing cloud may become whatever the user needs, from a standalone computer to a cluster or Grid node.Nowadays, cloud computing systems are increasing their role due to the fast (r)evolution of computer networks and communication technologies. A very clear proof of this fact is that very important companies like Amazon, Google, Dell, IBM, and Microsoft are investing billions of dollars in order to provide their own cloud solutions [28].As soon as the scientific community had access to cloud production infrastructures, the first applications started to run on the cloud [26,34]. In many Research areas, the leap from traditional cluster and Grid computing to this new paradigm has been mandatory, being the main reason an evolution in the computational needs of the applications [10]. A remarkable fact from this evolution is that in a pre-cloud environment, hardware defines the level of parallelism of an application. In cloud computing, the level of parallelism is defined by the application itself, as there is no restriction in the number of machines, and CPU availability is 100% guaranteed by standard.There

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Section: Validation Of Icancloudmentioning

confidence: 99%

iCanCloud: A Flexible and Scalable Cloud Infrastructure Simulator

et al. 2012

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“…A special case is observation of Phobos' eclipses, used to locate the actual landing site with high precision (Romero et al, 2011;Harri et al, 2012;Barderas and Romero, 2013). This in turn allows for correlation of the time stamps of the data with the correct local time, thereby making comparisons between observations from different landers more precise.…”

Section: Mnl Operationsmentioning

confidence: 99%

The MetNet vehicle: a lander to deploy environmental stations for local and global investigations of Mars

Harri

Pichkadze

Zeleny³

et al. 2017

Geosci. Instrum. Method. Data Syst.

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Abstract. Investigations of global and related local phenomena on Mars such as atmospheric circulation patterns, boundary layer phenomena, water, dust and climatological cycles and investigations of the planetary interior would benefit from simultaneous, distributed in situ measurements. Practically, such an observation network would require low-mass landers, with a high packing density, so a large number of landers could be delivered to Mars with the minimum number of launchers.The Mars Network Lander (MetNet Lander; MNL), a small semi-hard lander/penetrator design with a payload mass fraction of approximately 17 %, has been developed, tested and prototyped. The MNL features an innovative Entry, Descent and Landing System (EDLS) that is based on inflatable structures. The EDLS is capable of decelerating the lander from interplanetary transfer trajectories down to a surface impact speed of 50-70 m s −1 with a deceleration of < 500 g for < 20 ms. The total mass of the prototype design is ≈ 24 kg, with ≈ 4 kg of mass available for the payload.The EDLS is designed to orient the penetrator for a vertical impact. As the payload bay will be embedded in the surface materials, the bay's temperature excursions will be much less than if it were fully exposed on the Martian surface, allowing a reduction in the amount of thermal insulation and savings on mass.The MNL is well suited for delivering meteorological and atmospheric instruments to the Martian surface. The payload concept also enables the use of other environmental instruments. The small size and low mass of a MNL makes it ideally suited for piggy-backing on larger spacecraft. MNLs are designed primarily for use as surface networks but could also be used as pathfinders for high-value landed missions.

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“…A first approach to characterize the opportunities to observe transits within the MSL landing ellipse has been developed following the procedures described in Romero et al () and Harri et al ().…”

Section: Temporal Chronogrammentioning

confidence: 99%

“…To provide an observational plan, including observations within the whole shadow area, we have projected the border of the shadow cone of Phobos along the Sun–Phobos line on the surface of Mars. A model for the shadow border has been described by Romero et al ().…”

Section: Temporal Chronogrammentioning

confidence: 99%

“…The spatial patterns of solar eclipses by Phobos on Mars have been described by Bills & Comstock (). Romero et al () have developed, in detail, the models describing the shadow motion of Phobos and its size and shape on Mars, in order to provide a temporal chronogram to detect the shadow passages of Phobos in an equatorial band of δϕ = ±5° for the Mars MetNet Precursor Mission (MMPM; Harri et al ). These models are applied in Section in order to schedule observations of Phobos eclipses for the MSL landing ellipse.…”

Section: Introductionmentioning

confidence: 99%

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Opportunities to observe solar eclipses by Phobos with the Mars Science Laboratory

Barderas

Romero

Vázquez

et al. 2012

Monthly Notices of the Royal Astronomical Society

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We have generated predictions for observing Phobos transits during the period 2012-2014 using the Mars Science Laboratory. We describe how the detections of Phobos eclipses can be used as an alternative procedure to determine the coordinates of the rover. We present a numerical simulation to analyse the sensitivity of the precise observed contact times to the coordinate determination. The numerical results show that after four days of eclipse observations for 1 min each day, within the 25 × 20 km 2 landing site ellipse, the position of the lander can be determined to within an ellipse of 40 × 60 m 2 for uncertainties of 1 s in eclipse time observations. A 20 × 15 m 2 ellipse is estimated if a 0.1-s time precision can be gathered.

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Spatial chronogram to detect Phobos eclipses on Mars with the MetNet Precursor Lander

Cited by 7 publications

References 20 publications

iCanCloud: A Flexible and Scalable Cloud Infrastructure Simulator

iCanCloud: A Flexible and Scalable Cloud Infrastructure Simulator

The MetNet vehicle: a lander to deploy environmental stations for local and global investigations of Mars

Opportunities to observe solar eclipses by Phobos with the Mars Science Laboratory

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