Mars Reconnaissance Orbiter

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Op zaterdag 20 augustus 2005 21:24 schreef McGry het volgende:
ff iets semi-offtopic : ik dacht me ter herrinneren dat er een (groot) aantal maanden een keer zo´n duur onderzoeks-unitje van de nasa tegen mars aan kapot was geklapt omdat de software half in km/h en half in Mile/h was geschreven ... (of de gebruiker andere eenheden invoer oid).

Wie weet waar ik het over heb? Of komt dit belachelijke scenario echt alleen in mijn hoofd voor? Ik dacht het me echt te herrineren, maar ik probeer het nu even terug te googlen, en ik kan zo snel echt niets vinden... Iemand? Naam van die sonde? Datum? Link?

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Mars Reconnaissance Orbiter Halfway to Destination

_{By Alicia Chang Associated Press posted: 21 November 2005 09:00 am ET}



LOS ANGELES (AP) -- A NASA spacecraft is halfway toward Mars where it is expected to collect more data on the Red Planet than all previous Martian explorations combined.

The Mars Reconnaissance Orbiter successfully fired its six engines for 20 seconds last week to adjust its flight path in anticipation of a March arrival. It will fine-tune its trajectory two more times before it enters orbit around Mars, said Allen Halsell, deputy navigation chief at NASA's Jet Propulsion Laboratory in Pasadena.

Once in orbit, the two-ton spacecraft will join a trio of probes currently flying around Mars.

The orbiter is loaded with some of the most sophisticated science instruments ever flown into space, including a telescopic camera that can snap the sharpest pictures yet of the planet's rust-colored surface.

Previous spacecraft that have landed, circled or zipped past Mars have shot tens of thousands of images, but only about 2 percent of the planet has been seen at high resolution.

The orbiter also will continue to seek evidence of water, scan the surface for sites to land future robotic explorers and serve as a communications link to relay data to Earth. Already, it has successfully returned data at 6 megabits per second—about the speed of filling a CD-ROM every 16 minutes.

The reconnaissance orbiter was launched aboard an Atlas V rocket in August for the 310-million mile journey to the Red Planet. Its primary mission ends in 2010, but scientists say it has enough fuel to last until 2014. The $750 million mission is managed by JPL.

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Op donderdag 22 december 2005 22:09 schreef Kered het volgende:

[..]

MRO moet die theorie nog bevestigen met scherpere beelden.

Die wazige Mars foto's is ook werk van de NASA. Ze doen het expres.

"NASA saboteert de echte kleuren van Mars"

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Arrival Time Nears For New Mars Probe
^{By Leonard David Senior Space Writer posted: 24 February 2006 04:39 pm ET}


NASA is ready to add one more spacecraft to the constellation of orbiters and landers exploring the red planet.

The Mars Reconnaissance Orbiter (MRO) is ready to put the brakes on, slowing itself down for insertion into orbit around the planet. Arrival time is March 10 as MRO fires its main thrusters to slow itself enough to be captured by Mars’ gravity.

Launched last August, the instrument-loaded spacecraft has journeyed across the vacuum void and will soon begin its unprecedented surveying of Mars.

MRO has been performing extremely well during its cruise to the red planet, said Doug McCuistion, NASA Mars Exploration Program Director at NASA Headquarters in Washington, D.C.

Given earlier Mars missions that have failed to reach the planet, McCuistion cautioned: “Mars is hard. Mars can be unpredictable.” Getting into Mars orbit is not an easy task, he said during an MRO press briefing held today at NASA Headquarters.

“We’re 95 percent there,” said James Graf, MRO Project Manager at the Jet Propulsion Laboratory (JPL) in Pasadena, California. JPL is managing the $720 million mission for the NASA Science Mission Directorate.

Crucial maneuver

To slip into Mars orbit, MRO will fire its thrusters for about 27 minutes—decreasing the velocity of the spacecraft by 18 percent. That maneuver is crucial; otherwise the probe will sail right past Mars.

The process of slowing down MRO at Mars is going to be a nail biter for ground controllers.

“We’re doing a lot of first events,” Graf explained. First, the propellant system to fire MRO’s thrusters must be pressurized. In addition, there are software patches onboard the spacecraft that have not been used before, he said.

Once MRO is firing its thrusters, it will go behind Mars—out of contact with mission controllers. “We’ll be out of touch for the next 30 minutes…so we will not see the end of the burn itself,” Graff said.

Start of the suspenseful Mars Orbit Insertion (MOI) thruster firing is 1:25 p.m. Pacific Standard Time, with MRO coming out from behind the planet at 2:16 p.m. PST.

Deep dipping

Given a successful MOI, the spacecraft will spend half a year dipping in and out of Mars’ atmosphere in a process tagged as “aerobraking”—adjusting its initial 35-hour elongated orbit into a nearly circular, two-hour loop around Mars.

MRO’s aerobraking is to take place from March into October and calls for hundreds of precision-controlled dips into the upper atmosphere of Mars. Those dips have to be deep enough to slow the spacecraft by atmospheric drag, but not so deep that the orbiter becomes overheated.

The primary science-gathering phase of MRO is slated to start in November 2006 and last for over two years.

“MRO opens a new chapter in the history of Mars exploration,” said Bob Berry, Director of Space Exploration Systems at Lockheed Martin Space Systems Company near Denver, Colorado. The aerospace firm designed, built and operates MRO. The spacecraft carries six instruments and features a set of solar arrays that stretch tip-to-tip some 46 feet (14 meters), he said.

Berry said that MRO carries enough propellant and energy supply to last more than 10 years.

Over and under observations

MRO totes powerful instruments that can investigate every level of Mars: From underground layers to the top of the planet’s atmosphere.

For one, the Mars-bound spacecraft is hauling the most powerful telescopic cam­era ever sent outward to scan another planet. That gear can spot rocks the size of a small desk.

MRO will chart water-related deposits in areas as small as a baseball infield. The Italian space agency supplied the mission with a radar designed to probe for buried ice and water.

Also, a weather camera will monitor the entire planet daily, while an infrared sounder is assigned the duty to gauge atmospheric temperatures and the movement of water vapor.

JPL’s Graf said that MRO will return more data than all previous Mars missions combined.

Swimming in the data stream

Thanks to the huge amount of data streaming from MRO, scientists can expect a real intellectual leap forward in better understanding the red planet, said Michael Meyer, NASA Mars Lead Scientist at NASA Headquarters.

Along with revealing Mars as never before, Meyer said MRO will guide future mission decisions too.

MRO’s powerful sensors can scope out the landing spot near the northern polar ice cap where NASA’s Phoenix lander is slated to touch down in 2008, as well as the exploration zone in which the space agency’s next rover—the Mars Science Laboratory—will head for after its launch in 2009.

Even those “little rovers that just won’t quit”—NASA’s Spirit and Opportunity robots—can be seen by MRO, said NASA’s McCuistion. MRO can also provide, he added, useful data for some of the early decision-making as to where future human explorers can safely land on Mars.