SpaceX's Dragon Arrives at the ISS Successfully for First Official Cargo Run
October 10, 2012 1:44 PM
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Dragon arrived at the orbiting station early Wednesday morning
SpaceX's Dragon capsule successfully made it to the International Space Station (ISS) early this morning, where it will unload nearly 1,000 pounds of cargo for the next few weeks.
The unmanned Dragon capsule
set off toward the ISS Sunday night
, and arrived at the orbiting station early Wednesday morning. Astronauts on the ISS used a robot arm to securely latch the Dragon to the space station about 250 miles above the Pacific, just west of Baja California.
"Looks like we've tamed the Dragon," said Sunita Williams, ISS commander. "We're happy she's on board with us."
The Dragon's hatch will be opened tomorrow, where astronauts will begin unloading the cargo inside. Right now, Dragon contains 882 pounds of scientific experiments, groceries, clothes and other items. The capsule will return to Earth with twice as much cargo.
This week's venture to the ISS marks
Dragon's second journey to the ISS
. It originally made a test flight back in May of this year, but this particular trip marks the first official cargo run as part of a $1.6 billion contract with NASA. This contract locks SpaceX in to 12 total cargo runs to the ISS through 2015.
While today's linkup at the ISS was a successful one, the entire trip wasn't perfect. A prototype communications satellite aboard SpaceX's Falcon 9 rocket (which launched Dragon to the ISS) was sent into the wrong orbit due to one of the Falcon 9s' Merlin engines shutting down early during Sunday night's launch. Orbcomm, the company that owns the prototype OG2 satellite, said it was "deposited into a lower-than-intended orbit." The company is now analyzing whether the satellite can use its onboard propulsion system to adjust its orbit.
Aside from that malfunction, all went well for
the SpaceX mission
. Dragon is due to return to Earth near the end of October, after all cargo is unloaded and reloaded.
SpaceX, a private space transport company from California, stepped in as America's new form of transportation to the ISS after NASA retired its space shuttle fleet throughout 2011. This retirement left American astronauts with no way to get to the ISS, except onboard a Russian Soyuz rocket -- which has become pretty pricey.
It was clear that the U.S. needed a new way to send supplies to and from the ISS, and SpaceX was happy to provide its Dragon capsule and Falcon 9 rocket.
Dragon is set to make its next cargo run for the NASA contact in January 2013.
SpaceX is also working on a Dragon capsule that can be manned by astronauts, and hopes to send the first manned Dragon to the ISS between 2015 and 2017.
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RE: Two Payloads?
10/10/2012 4:29:02 PM
Not correct. Read my post above.
The early engine 1 shutdown resulted in lower performance due to gravity losses. This necessitated an extended burn on the 2nd stage to make up the velocity. This left the remaining propellant in the 2nd stage below safety parameters set by NASA based on their Monte Carlo analysis before the flight to achieve an orbit sufficiently far enough away from the space station. The 2nd stage was not re-ignited because the health check on the 2nd stage (attitude,orbit, fuel remaining, etc) were outside the predetermined safety window to reach the orbit intended. An orbital recalc on the fly would not be allowed by NASA when ISS safety is concerned.
The 2nd stage was not re-ignited due to a predetermined decision process, it was not due to a hardware problem with the second stage.
RE: Two Payloads?
10/10/2012 5:06:27 PM
That actually paints a better picture then what I imagined; a whole second hardware failure on the 2nd stage on top of the big one on the first stage. Thanks for the clarification!
RE: Two Payloads?
10/11/2012 1:09:19 PM
That sounds pretty plausible. There's been a number of different reports that have come out, but yours sounds the most accurate that brings the others together.
"Young lady, in this house we obey the laws of thermodynamics!" -- Homer Simpson
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