Just minutes before SpaceX started fueling Falcon Heavy for its commercial launch debut, NASA announced that the company had won a contract for its Double Asteroid Redirection Test (DART) mission, to be launched by Falcon 9 for the low cost of $ 69M .
Total of $ 250M total, the DART mission will be as light and fast as possible, using a dedicated Falcon 9 to send the ~ 600kg (~ 1300lb) spacecraft and its Italian companion cubesat on an ~ 11 million kilometers (~ 7M mi) journey to the binary asteroid Didymos. The ultimate purpose of DART is to effectively prove both technologies and physics that could be used in the future to defend Earth from asteroids known as a collision course.
If all goes as planned during DART's imminent design review milestones and hardware integration, Falcon 9 could launch the spacecraft towards the Didymos asteroid system in June 2021
for an October 2022 arrival. That "arrival" would involve DART impacting Didymos-B – the smaller of the pair at 163 m (535 ft) across – at a relative velocity of more than 6 km / s (3.7 mi / s). Nicknamed Didymoon, Didymos-B effectively orbits Didymos-A. At that speed, the ~ 600 kg probe will create an impact with the equivalent of nearly two and a half tons or TNT, the purpose of which is to determine just how much the sheer kinetic energy of impact Didymoon's orbit to be shifted by about 1% as measured by the time it takes to orbit Didymos-A, from ~ 11.9 hours to ~ 11.8 to 12.0 hours. This is a very small change but one that should – in theory – be easily measurable at telescopes on Earth, despite the fact that Didymoon has been estimated to have a mass of approximately 3.5 million metric tons (7.6 billion pounds), approximately seven million times heavier than DART. In short, NASA is going to functionally bomb and asteroid moon to see if humans can use kinetic impactors to gently "threatening" space objects off of the offending trajectory or even decades in advance.
Despite the inherently destructive, single-use nature that DART's impactor status bestows, current plans thankfully include Italian cubesat known as LICIACube. The small copassenger will deploy two days before impact to fully exploit the scientific value of DART's demise with high-quality photos of the event and aftermath. LICIACube will be traveling the same speed and thus will not be able to enter orbit around the asteroid system, but a European Space Agency (ESA) mission known as Hera plans to do just that in the mid-2020s to better characterize Didymos and the crater (hopefully) made by DART.
Aside from the mission itself, DART serves as a technology demonstration platform for NASA. The NASA-built NEXT-C ion thruster and powerpack as well as the first standalone use of the Roll-Out Solar Array (ROSA) deployment mechanism (shown above being tested on the ISS). Even more intriguing is a proposed transformational solar array planned at one point for DART, a flexible combination of advanced solar cells (~ 33% efficient) and mirror concentrators that could feed a spacecraft five times as much power for a given solar array area and distance from the sun. It's unclear whether this will make it into DART's final design but it still appears to be on the table as of January 2019. According to the contracted manufacturer, DART's solar array will produce ~ 6.6 kW, while rough estimates suggest that the solar array will have an area of 16 m 2 (170 ft 2). Relative to the simplicity of the deployment mechanism and small size of DART (~ 600 kg total), this is an incredible amount of accessible power.
Getting to orbit
For NASA's SpaceX launch contract, the agency will pay just $ 69M, barely 10% above Falcon 9's bare-minimum list price of $ 62M. It is safe to assume that the contract award – days after SpaceX abruptly dropped an official protest of ULA winning a $ 150M NASA contract – might not be coincidence . Regardless, SpaceX's decision to bid so low for a NASA launch does some serious credence to the company's protest that ULA's contract for the mission – NASA's LUCY asteroid explorer – was "solidly more [expensive]" than the bid SpaceX submitted.
Weighing just ~ 600 kg (~ 1300 lb) law, DART could end up with additional coplaugers on Falcon 9, although there is a precedent set at NASA's ~ 360 kg TESS and Taiwan's Formosat -5 for SpaceX giving tiny spacecraft dedicated launches. Rocket, launching a flight test Falcon 9 Block 5, given the likelihood that NASA will have certified flight samples SpaceX vehicles for almost any launch by 2021.
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