And here’s @SpaceX ’s #Falcon9 booster 1063.8 fresh back from space, returning to home in @portoflongbeach this morning. 10-30-22
Quote from: ZachS09 on 10/28/2022 11:12 pmQuote from: Jim on 10/28/2022 09:38 pmQuote from: OneSpeed on 10/28/2022 06:00 amand also, from the consistency of the webcast data, I'm seeing no evidence for any dogleg maneuvers alluded to up-thread in this mission. An optical illusion may be the more likely culprit.A dogleg is required during the first or second stage burn. A launch azimuth of around 131 degrees would be required for a direct injection to a 52 degree inclination. Vandenberg's minimum azimuth for range safety is 158 degrees When exactly could the dogleg have been performed? Immediately after fairing separation?No, the dogleg should be part of the first stage burn. A dogleg is least expensive when done at as low a velocity as possible.Here's a picture that shows the likely location. The more vertical line is a plot of 158o from Vandenburg. The other line is plotting backwards from the droneship position. At the latitude of the droneship, a 56.2o inclination orbit passes overhead at an azimuth of 140o = asin(cos(56.2)/cos(29.62)). Reversing this course yields 320o. Both plots were made with this GPS Visualizer. I then superimposed the two plots.So if done as an impulsive maneuver, it would be done a little south of the channel islands. In practice it's more efficient to do this as a gentle curve.
Quote from: Jim on 10/28/2022 09:38 pmQuote from: OneSpeed on 10/28/2022 06:00 amand also, from the consistency of the webcast data, I'm seeing no evidence for any dogleg maneuvers alluded to up-thread in this mission. An optical illusion may be the more likely culprit.A dogleg is required during the first or second stage burn. A launch azimuth of around 131 degrees would be required for a direct injection to a 52 degree inclination. Vandenberg's minimum azimuth for range safety is 158 degrees When exactly could the dogleg have been performed? Immediately after fairing separation?
Quote from: OneSpeed on 10/28/2022 06:00 amand also, from the consistency of the webcast data, I'm seeing no evidence for any dogleg maneuvers alluded to up-thread in this mission. An optical illusion may be the more likely culprit.A dogleg is required during the first or second stage burn. A launch azimuth of around 131 degrees would be required for a direct injection to a 52 degree inclination. Vandenberg's minimum azimuth for range safety is 158 degrees
and also, from the consistency of the webcast data, I'm seeing no evidence for any dogleg maneuvers alluded to up-thread in this mission. An optical illusion may be the more likely culprit.
Lou, if SpaceX had done what you suggest, the launch hazard area for the ASDS would make no sense, because it wouldn't align with the booster ground track. But what they did is odd as well, because they actually flew at closer to 142° from North, much less than 158°. Perhaps 158° is out of date?For an orbital inclination of 53.2° from a latitude of 34.633°, the launch azimuth in the inertial frame is 180 - 46.72 = 133.28°. However, in the orbital frame of reference, it is 180 - 44.73 = 135.27°. So, they were about 7° short of the required azimuth.Perhaps this difference was made up by a second S2 burn at apogee, or even by the satellites themselves? Or a bit of both?
