Any nasa tv link for mobile(android) devices?
Quote from: seshagirib on 09/21/2014 03:54 pmAny nasa tv link for mobile(android) devices?The official NASA app for iOS/Android includes NASA TV. Just search for it their respective app stores.
When do they start?Do not see anything MAVEN related on NASA live TV.or AM I looking at the wrong stream?http://www.nasa.gov/multimedia/nasatv/index.html#.VB7_2JSSxA0
MAVEN MOI coverage begins at 9:30 pm EDT, 0130 UTC Sept. 22. Actual TIG is at 9:50 pm EDT, 0150 UTC Sept. 22.
Anyone spotted any jars of lucky peanuts ...thought I saw an M&M bag...not,sure if that counts...😄
Control room congratulations.
"All the robotic missions are human missions." ?!
Quote from: Steven Pietrobon on 09/22/2014 02:34 am"All the robotic missions are human missions." ?!From an earlier (and separate) mission, it was noted that this was due to human involvement in the mission at various stages (not fully autonomous).I'm sure that's something they will improve on over the years
You can clearly see the Doppler jump here at engine cutoff.
Quote from: Steven Pietrobon on 09/22/2014 02:31 amYou can clearly see the Doppler jump here at engine cutoff.Wait a second. Doppler shift is dependent only on relative velocity.[...]But I have no idea why there's a jump. Anyone?
I think this makes perfect sense. They are plotting the residual, the difference from what they expect. The engine is underperforming slightly, so there is a non-zero residual. Now they get the the end of the (expected) firing, still with a non-zero residual. But the accelerometer on the craft knows the engines have been underperforming, so fires for 11 more seconds to compensate. This drives the residual to 0 (since it's now the velocity that was expected after the burn).So it's not a step function change in residual, it's a very rapid convergence to 0 residual as the spacecraft corrects during the additional 11 seconds it added on.
Quote from: LouScheffer on 09/22/2014 02:22 pmI think this makes perfect sense. They are plotting the residual, the difference from what they expect. The engine is underperforming slightly, so there is a non-zero residual. Now they get the the end of the (expected) firing, still with a non-zero residual. But the accelerometer on the craft knows the engines have been underperforming, so fires for 11 more seconds to compensate. This drives the residual to 0 (since it's now the velocity that was expected after the burn).So it's not a step function change in residual, it's a very rapid convergence to 0 residual as the spacecraft corrects during the additional 11 seconds it added on.But look at the slopes of the upper and lower bounds for the residuals (right before nominal cutoff) - corresponding to maximum tolerated underperformance and maximum tolerated over-performance of the engine.The engine would've still under-performed during those 11 compensatory seconds. Hell.. even if it suddenly got a kick, and started over-performing (right at the edge of tolerable overperformance), it wouldn't compensate so fast as to yield a massively different slope.In other words - if you connected the two discontinuous ends of the green trace with a straight line, the slope of that line you would be drawing in... is way steeper than even the predicted slope in the case of an over-performing engine (lower trace of the residual envelope).