The lack of telemetry from the progress could be explained by the rotation (telemetry antenna pointing in the wrong direction).But what about telemetry from the rocket's third stage? Was there any? What did it show? Was everything nominal?
The likelihood that the two vehicles would have been inserted into an orbit precisely matching that of a pre-existing debris cloud is so remote as to be nearly-unthinkable.
Assuming no recovery of the Progress, any likelihood that the IDA-1 could get bumped from the Dragon CRS-7 trunk?
The Soyuz crewed launch to ISS is set for May 26th. Is the same 3rd stage used for crewed Soyuz launches as well? If so I would imagine there's a possibility for delay as well, if the 3rd stage or any common systems are implicated, but I'm by no means an expert.
I would think the threat of delays to manned Soyuz missions would be of more concern that resupply missions if it turns out to be a Stage 3 problem.
Since if there is a stage 3 problem it will likely be a control system problem
Quote from: BowShock on 04/29/2015 12:02 amQuote from: ChrisWilson68 on 04/28/2015 11:54 pmQuote from: DaveS on 04/28/2015 11:07 pmQuote from: StarGeezer on 04/28/2015 10:58 pmI haven't seen anything so far indicating how the craft is 'spinning'. From my geometry days we have x axis (front to back) y axis (left right) and z axis(up down). From edkyle's gif it appears rotating around z axis. How hard is it to correct rotation in one, two or all three axes?Well, you should not read too much into Ed's gif as it's a very simple 2D animation. Based on the video downlinked, it is in a multi-axis spin, so it would require a 3D visualization.Unless different forces are acting on different parts of an object, it always rotates around a single axis. The question is just where that axis is. It might not be close to the x, y, or z axes of the spacecraft.Not true; in torque-free rigid body motion, the angular velocity vector is not stationary in the body (vehicle) axes.Conservation of angular momentum says the angular momentum is conserved in a torque-free system, and if the body is rigid, you can only have the same angular momentum if you have the same angular velocity.Precession comes from small torques. It also comes from relativistic effects of warped space, but that's more a property of the frame itself precessing -- the inertial frame itself precesses, and in that frame the angular velocity is conserved.There are various small torques that will affect Progress, including atmospheric drag differential drag, and magnet effects. Those torques could cause some slow precession, but the scale should be small compared to its current angular velocity.
Quote from: ChrisWilson68 on 04/28/2015 11:54 pmQuote from: DaveS on 04/28/2015 11:07 pmQuote from: StarGeezer on 04/28/2015 10:58 pmI haven't seen anything so far indicating how the craft is 'spinning'. From my geometry days we have x axis (front to back) y axis (left right) and z axis(up down). From edkyle's gif it appears rotating around z axis. How hard is it to correct rotation in one, two or all three axes?Well, you should not read too much into Ed's gif as it's a very simple 2D animation. Based on the video downlinked, it is in a multi-axis spin, so it would require a 3D visualization.Unless different forces are acting on different parts of an object, it always rotates around a single axis. The question is just where that axis is. It might not be close to the x, y, or z axes of the spacecraft.Not true; in torque-free rigid body motion, the angular velocity vector is not stationary in the body (vehicle) axes.
Quote from: DaveS on 04/28/2015 11:07 pmQuote from: StarGeezer on 04/28/2015 10:58 pmI haven't seen anything so far indicating how the craft is 'spinning'. From my geometry days we have x axis (front to back) y axis (left right) and z axis(up down). From edkyle's gif it appears rotating around z axis. How hard is it to correct rotation in one, two or all three axes?Well, you should not read too much into Ed's gif as it's a very simple 2D animation. Based on the video downlinked, it is in a multi-axis spin, so it would require a 3D visualization.Unless different forces are acting on different parts of an object, it always rotates around a single axis. The question is just where that axis is. It might not be close to the x, y, or z axes of the spacecraft.
Quote from: StarGeezer on 04/28/2015 10:58 pmI haven't seen anything so far indicating how the craft is 'spinning'. From my geometry days we have x axis (front to back) y axis (left right) and z axis(up down). From edkyle's gif it appears rotating around z axis. How hard is it to correct rotation in one, two or all three axes?Well, you should not read too much into Ed's gif as it's a very simple 2D animation. Based on the video downlinked, it is in a multi-axis spin, so it would require a 3D visualization.
I haven't seen anything so far indicating how the craft is 'spinning'. From my geometry days we have x axis (front to back) y axis (left right) and z axis(up down). From edkyle's gif it appears rotating around z axis. How hard is it to correct rotation in one, two or all three axes?
If precession comes from torques, why does the earth's axial spin precess? I have heard that while the north pole points at the north star right now, in 20,000 years it will not and our seasons will be reversed. What is the cause of torque in that system?
TASS has some new interesting details, but no signs of any hope.http://tass.ru/en/non-political/792406