I watched the launch videos and I cant see any difference in time between clamp release and tel throwback. ( at least as far as youtube single step). So I would say the tel is NOT released even 10ms before the falcon is released.
Quote from: Comga on 02/20/2017 02:35 pmCongrats to Buzz Aldrin, who made it to another launch. (Had a conversation with him! He praised a mutual colleague, touted some of his own inventions, and told a chiding and affectionate story about Neil Armstrong. It was another amazing few minutes.)Can we please have those stories retold here?
Congrats to Buzz Aldrin, who made it to another launch. (Had a conversation with him! He praised a mutual colleague, touted some of his own inventions, and told a chiding and affectionate story about Neil Armstrong. It was another amazing few minutes.)
Quote from: rsdavis9 on 02/20/2017 04:28 pmI watched the launch videos and I cant see any difference in time between clamp release and tel throwback. ( at least as far as youtube single step). So I would say the tel is NOT released even 10ms before the falcon is released.Clamp release and the 1.5º lean back is at T-2 minutes. The TE does throw back at T-0, but at that point it's already detached and slightly away from the rocket.
Could there be a weight difference in the loading of Dragon on the different flights. From what I understand even small changes in weight up there have pretty noticeable changes in burn times, etc...
I noticed in the first stage landing drone video there is a new building at LZ-1. IIRC it was not there last April during Family Day. Is it for more storage?
Quote from: Folgers25 on 02/20/2017 07:00 pmI noticed in the first stage landing drone video there is a new building at LZ-1. IIRC it was not there last April during Family Day. Is it for more storage? It's been there since CRS-9.
Quote from: Alter Sachse on 02/20/2017 07:40 amDo we have an exact launch time ?Ed Kyle :14:38http://www.spacelaunchreport.com/14:38:59http://www.orbita.zenite.nu/14:39:00http://forum.nasaspaceflight.com/index.php?topic=8184.124016:38http://prehled-druzic.blogspot.de/2017/02/2017-009.html#yAIt was originally 14:38:59 going into Sunday, but they updated it to exactly 14:39:00 a few hours before launch.
Do we have an exact launch time ?Ed Kyle :14:38http://www.spacelaunchreport.com/14:38:59http://www.orbita.zenite.nu/14:39:00http://forum.nasaspaceflight.com/index.php?topic=8184.124016:38http://prehled-druzic.blogspot.de/2017/02/2017-009.html#yA
Quote from: old_sellsword on 02/20/2017 11:28 amQuote from: Alter Sachse on 02/20/2017 07:40 amDo we have an exact launch time ?Ed Kyle :14:38http://www.spacelaunchreport.com/14:38:59http://www.orbita.zenite.nu/14:39:00http://forum.nasaspaceflight.com/index.php?topic=8184.124016:38http://prehled-druzic.blogspot.de/2017/02/2017-009.html#yAIt was originally 14:38:59 going into Sunday, but they updated it to exactly 14:39:00 a few hours before launch.The hosted webcast shows the time on the camera inside the solar array fairing. At T+12:00 it shows 14:51:11.Assuming the clock on the camera is correct (not that I do), that would put the launch time at 14:39:11
Through rolling the dice on reddit, I discovered a thread about stange "UFO" sightings over Iran from yesterday. Based on the available track in the webcast, and the fact that this was reported at about 10:15 EST, that these were videos of post SECO-1 maneuvers. I wont trouble this audience with linked directly to this strange thread, but the videos linked may be of interest. They appear to catch either dragon, or the F9 second stage performing a maneuver. Sorry of this is the wrong thread for this, but I think additional video of post launch activities is pretty cool, especially because a thruster (or engine) impulse is visible in some of these videos.
Quote from: SmallKing on 02/20/2017 01:46 amSECO seemed to happen about 20 seconds late, any explanation?Some, if not all of that, is webcast latency. There was, for example, a 10 second delay between ground and on-board views of the first stage landing on the SpaceX split-screen. I would guess that the second stage view has 10 seconds or more of delay. The on-screen mission elapsed time clock does not have the same delay. - Ed Kyle
SECO seemed to happen about 20 seconds late, any explanation?
Quote from: old_sellsword on 02/20/2017 07:26 pmQuote from: Folgers25 on 02/20/2017 07:00 pmI noticed in the first stage landing drone video there is a new building at LZ-1. IIRC it was not there last April during Family Day. Is it for more storage? It's been there since CRS-9.Guess I don't member seeing it then. Any idea what it is for?
Quote from: smh on 02/20/2017 08:12 pmThe hosted webcast shows the time on the camera inside the solar array fairing. At T+12:00 it shows 14:51:11.Assuming the clock on the camera is correct (not that I do), that would put the launch time at 14:39:11After the scrub on the 18th a half dozen reports were about evenly split on 9:38:58am EST and 9:38:59 as the targeted T=0 time for the 19th.About 9 hours before the launch on the 19th the SpaceX home web page said that the targeted launch time was 9:38:58am EST.Of course, the targeted launch time is determined closer to launch based on updated ISS TLEs.About 1 hour before launch on the 19th the 45th Space Wing tweeted that launch would be 09:38:59.5 EST and hence they would call it 09:39am EST.I find it very difficult to believe that T=0 [and hence liftoff] did not occur between 09:38:59am EST and 09:39:00am EST on February 19th.I usually wait for the millisecond time to be released for the definitive launch time.Carl
The hosted webcast shows the time on the camera inside the solar array fairing. At T+12:00 it shows 14:51:11.Assuming the clock on the camera is correct (not that I do), that would put the launch time at 14:39:11
A quick question for the collective wisdom here.The thick cloud layer rule for launch. I don't remember a daytime launch going through the soupy clouds (at least from the vantage point of the camera angles) as we saw on Sunday. How thick is too thick? I assumed the rule was in part to allow for tracking cameras to follow the launch.