The exact location of Curiosity on the surface of Mars is determined using data transmitted from its antennas as well as the space probes that orbit the red planet. It is very unlikely that these systems would fail but in such an eventuality there would be an alternative for determining the location of the rover: 'ask it' what eclipses it sees.
"Observing these events offers an independent method for determining the coordinates of Curiosity," explains Gonzalo Barderas, researcher at the Complutense University of Madrid (UCM) and coauthor of the study.
For this method to be used the robot must have a camera or sensor capable of sending data about an eclipse. "It could prove especially useful when there is no direct communication with Earth that allows for estimation of its position using radiometric dating or images provided by orbiters," outlines the researcher.
The initial objective of the UCM group was to create a mathematical tool for predicting Phobos eclipses from the surface of Mars. But their method also proved useful in locating the precise location of any spacecraft that are also capable of observing eclipses from there. The details have been published in the 'Monthly Notices of the Royal Astronomical Society' journal.
The model predicted partial eclipses that took place on the 13 and 17 September. The MastCam camera that Curiosity carries in its mast captured them without any problems. The Spanish REMS instrument, namely the vehicle's environmental station, also detected a reduction in ultraviolet solar radiation during the eclipses (5% in the first case).
The initial simulations and the real end images coincided with a precision of one second. In order to make their calculations, the scientists considered the initial predicted landing area for Curiosity: an ellipse of 7 x 20 km2.
In addition, with just two minutes of observations and using the start and end times of Phobos' contact with the Sun, error can be reduced in the rover coordinates from an order of magnitude of kilometres to another of metres.
According to the model, the next movements of the Martian moon will take place between the 13 and 20 August 2013 and between the 3 and 8 August 2014. Curiosity will have the chance to observe eclipses again and the Spanish scientists will be able to confirm the validity of their tool.
"In any case, this method can be applied to other space probes operating on the surface of Mars that have the ability to make optical observations or that have instruments that measure solar radiation," outlines Luis Vázquez, one of the authors.
In fact, under the scientific management of Vázquez, this study forms part of a Spanish project associated to the joint Russian, Spanish and Finnish MetNet mission to distribute small meteorological stations across Mars.
The project is called the Mars Environmental Instrumentation for Ground and Atmosphere (MEIGA). Its aim is to place different sensors on the red planet, including those involving solar radiation that can detect eclipses.
G. Barderas, P. Romero, L. Vázquez, J. L. Vazquez-Poletti, I. M. Llorente. "Opportunities to observe solar eclipses by Phobos with the Mars Science Laboratory". Monthly Notices of the Royal Astronomical Society 426 (4): 3195-3200, October 2012. Doi: 10.1111/j.1365-2966.2012.21939.x.
More articles from Physics and Astronomy:
Researchers Solve Mystery of X-Ray Light From Black Holes
18.06.2013 | Johns Hopkins
Hubble Uncovers Evidence for Extrasolar Planet Under Construction
17.06.2013 | Space Telescope Science Institute (STScI)
... two engines aircraft project “Elektro E6”.
The countdown has been started for opening the gates again for the worldwide leading aviation and space event in Le Bourget, Paris from June 17th - 23rd, 2013.
EADCO & PC-Aero will present at the Paris Air Show in Hall H4 booth F-7 their new future aircraft and innovative project: ...
Siemens scientists have developed new kinds of ceramics in which they can embed transformers.
The new development allows power supply transformers to be reduced to one fifth of their current size so that the normally separate switched-mode power supply units of light-emitting diodes can be integrated into the module's heat sink.
The new technology was developed in cooperation with industrial and research partners who ...
Cheaper clean-energy technologies could be made possible thanks to a new discovery.
Led by Raymond Schaak, a professor of chemistry at Penn State University, research team members have found that an important chemical reaction that generates hydrogen from water is effectively triggered -- or catalyzed -- by a nanoparticle composed of nickel and phosphorus, two inexpensive elements that are abundant on Earth. ...
The Fraunhofer Institute for Laser Technology ILT generated a lot of interest at the LASER World of Photonics 2013 trade fair with its numerous industrial laser technology innovations.
Its highlights included beam sources and manufacturing processes for ultrashort laser pulses as well as ways to systematically optimize machining processes using computer simulations. There was even a specialist booth at the fair dedicated to the revolutionary technological potential of digital photonic production.
Now in its fortieth year, LASER World ...
It's not reruns of "The Jetsons", but researchers working at the National Institute of Standards and Technology (NIST) have developed a new microscopy technique that uses a process similar to how an old tube television produces a picture—cathodoluminescence—to image nanoscale features.
Combining the best features of optical and scanning electron microscopy, the fast, versatile, and high-resolution technique allows scientists to view surface and subsurface features potentially as small as 10 nanometers in size.
The new microscopy technique, described in the journal AIP Advances,* uses a beam of electrons to excite a specially ...
18.06.2013 | Materials Sciences
18.06.2013 | Health and Medicine
18.06.2013 | Life Sciences
14.06.2013 | Event News
13.06.2013 | Event News
10.06.2013 | Event News