> "Orbcomm understood from the beginning that the orbit-raising maneuver was tentative," Nelson wrote. "They accepted that there was a high risk of their satellite remaining at the Dragon insertion orbit. SpaceX would not have agreed to fly their satellite otherwise, since this was not part of the core mission and there was a known, material risk of no altitude raise."
High risk, to me, says that there was a pretty good chance it was gonna fall.
That's pretty clearly a little doublespeak going on. Of course it's shitty that the secondary mission didn't happen, but neither Orbcomm nor SpaceX wants this to go down in the press as a failure, so the party line is "Well, it was a big risk, and we accepted it." There's not much else Orbcomm could say unless they wanted to lambaste SpaceX as a scapegoat, which they don't want to do because of an ongoing relationship.
Indeed. From a SpaceNews article: "Orbcomm is relying on Hawthorne, Calif.-based SpaceX to launch all its second-generation satellites. Eight Orbcomm satellites are scheduled for launch aboard a Falcon 9 in mid-2013, with another 10 satellites scheduled for a 2014 Falcon 9 launch."
Besides polluting the relationship with SpaceX, raising a fuss would put their own plans into doubt. Orbcomm's stock price already fell 15% in the past week, I don't think they need more trouble:
The beginning being as soon as they knew their satellite had been deposited well below the desired altitude. If the F9 engine hadn't failed, they wouldn't have needed to do an orbit raising maneuver at all and there would have been no risk of the satellite deorbiting.
A orbit raising maneuver was always necessary to get the satellite to its target. Relevant sections:
> "Orbcomm had planned on reaching an altitude of 466 miles above Earth..."
> "Due to the engine shutdown, the Falcon 9 used slightly more fuel and oxygen to reach Dragon's intended 202 mile- (325-km) high orbit. Over the next 2.5 days, Dragon flew itself to the station's orbit 250 miles above Earth. It reached the $100 billion outpost, a project of 15 countries, on Wednesday."
Initial Dragon Orbit: 202 miles above Earth
ISS: 250 miles above Earth
Desired Satellite Location: 466 miles above Earth
There was only a 95% chance of the rocket reaching the location 466 miles above Earth (due to the reduced fuel reserves), so they didn't perform the burn, because NASA's contract with them forbade it (had to be >=99% chance of success).
Right. They were hoping the F9 upper stage would do that orbit raising for them (the non-risky version). The risky part was trying to do an orbit raising with the satellite's onboard fuel, which was the only option after the F9 lost an engine.
The expected outcome (F9 upper stage doing the raising) was considered non-risky, and I'm sure that's the premise the insurance company was operating under when they agreed to insure the satellite.
No, the risky part was trying to raise the orbit using the F9 upper stage after it had burned more fuel than expected due to the failed engine.
Quoth the article:
> Falcon 9 had enough kerosene fuel left over to relight the engine, but the amount of liquid oxygen "was only enough to achieve a roughly 95 percent likelihood of completing the second burn, so Falcon 9 did not attempt a restart,"
I doubt many satellites have enough maneuvering fuel on-board to raise their orbit like that.
You're right. I remember them discussing attempting to raise the orbit with onboard fuel, but I doubt that was possible.
My point was more that, prior to the engine failure, raising the orbit with the second stage was considered non-risky. You're correct that after the failure, raising the orbit with the second stage was risky.
From what I recall, the Orbcomm satellite was supposed to be left in a 350km x 750km orbit by the Falcon 9, and would then use its own reserves to achieve a basically circular orbit, 750km x 750km.
> "Orbcomm understood from the beginning that the orbit-raising maneuver was tentative," Nelson wrote. "They accepted that there was a high risk of their satellite remaining at the Dragon insertion orbit. SpaceX would not have agreed to fly their satellite otherwise, since this was not part of the core mission and there was a known, material risk of no altitude raise."
High risk, to me, says that there was a pretty good chance it was gonna fall.