Quote from: Comga on 05/22/2018 08:41 pmQuote from: whitelancer64 on 05/22/2018 08:37 pmQuote from: Comga on 05/22/2018 08:34 pmSeparate subject.Sometime before launch, during LOX loading, there was significant venting from the TEL. Big vapor clouds.Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.It was not a judgment, I was not saying anything was wrong or unexpected. It's just something I had not noticed before.I was told that any LOX being released would be a safety issue and wouldn't happen.Does anyone here have insight into the nature of this?When the webcast is up on YouTube perhaps a screenshot can be captured.Occasional large vents have been seen before. What you're describing doesn't sound unusual. Not a large vent cloud.Something solid or liquid and cold. Dense enough to fall like a stone but dissipating as it falls.Again, I am not saying it's bad or different, just something I have not noticed on previous launches.Have been told it cannot be LOX.But what could it be?edit: The YouTube video starts at under T-1:00 so doesn't go back far enough to see this.I've seen the same thing on recent launches. Looks like a spurt of LOX that evaporates as it falls. Watch the last several minutes of the last few launches; I'm sure you'll see something similar on at least one or two of them. Visibility and apparent size of the vent event almost certainly depends greatly on ambient temperature, humidity and lighting.
Quote from: whitelancer64 on 05/22/2018 08:37 pmQuote from: Comga on 05/22/2018 08:34 pmSeparate subject.Sometime before launch, during LOX loading, there was significant venting from the TEL. Big vapor clouds.Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.It was not a judgment, I was not saying anything was wrong or unexpected. It's just something I had not noticed before.I was told that any LOX being released would be a safety issue and wouldn't happen.Does anyone here have insight into the nature of this?When the webcast is up on YouTube perhaps a screenshot can be captured.Occasional large vents have been seen before. What you're describing doesn't sound unusual. Not a large vent cloud.Something solid or liquid and cold. Dense enough to fall like a stone but dissipating as it falls.Again, I am not saying it's bad or different, just something I have not noticed on previous launches.Have been told it cannot be LOX.But what could it be?edit: The YouTube video starts at under T-1:00 so doesn't go back far enough to see this.
Quote from: Comga on 05/22/2018 08:34 pmSeparate subject.Sometime before launch, during LOX loading, there was significant venting from the TEL. Big vapor clouds.Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.It was not a judgment, I was not saying anything was wrong or unexpected. It's just something I had not noticed before.I was told that any LOX being released would be a safety issue and wouldn't happen.Does anyone here have insight into the nature of this?When the webcast is up on YouTube perhaps a screenshot can be captured.Occasional large vents have been seen before. What you're describing doesn't sound unusual.
Separate subject.Sometime before launch, during LOX loading, there was significant venting from the TEL. Big vapor clouds.Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.It was not a judgment, I was not saying anything was wrong or unexpected. It's just something I had not noticed before.I was told that any LOX being released would be a safety issue and wouldn't happen.Does anyone here have insight into the nature of this?When the webcast is up on YouTube perhaps a screenshot can be captured.
Quote from: Comga on 05/22/2018 08:41 pmQuote from: whitelancer64 on 05/22/2018 08:37 pmQuote from: Comga on 05/22/2018 08:34 pmSeparate subject.Sometime before launch, during LOX loading, there was significant venting from the TEL. Big vapor clouds.Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.It was not a judgment, I was not saying anything was wrong or unexpected. It's just something I had not noticed before.I was told that any LOX being released would be a safety issue and wouldn't happen.Does anyone here have insight into the nature of this?When the webcast is up on YouTube perhaps a screenshot can be captured.Occasional large vents have been seen before. What you're describing doesn't sound unusual. Not a large vent cloud.Something solid or liquid and cold. Dense enough to fall like a stone but dissipating as it falls.Again, I am not saying it's bad or different, just something I have not noticed on previous launches.Have been told it cannot be LOX. (Even had the comment edited out by a mod, as is his right.)But what could it be?A screenshot would help.
Quote from: whitelancer64 on 05/22/2018 08:37 pmQuote from: Comga on 05/22/2018 08:34 pmSeparate subject.Sometime before launch, during LOX loading, there was significant venting from the TEL. Big vapor clouds.Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.It was not a judgment, I was not saying anything was wrong or unexpected. It's just something I had not noticed before.I was told that any LOX being released would be a safety issue and wouldn't happen.Does anyone here have insight into the nature of this?When the webcast is up on YouTube perhaps a screenshot can be captured.Occasional large vents have been seen before. What you're describing doesn't sound unusual. Not a large vent cloud.Something solid or liquid and cold. Dense enough to fall like a stone but dissipating as it falls.Again, I am not saying it's bad or different, just something I have not noticed on previous launches.Have been told it cannot be LOX. (Even had the comment edited out by a mod, as is his right.)But what could it be?
Quote from: whitelancer64 on 05/22/2018 08:42 pmQuote from: Comga on 05/22/2018 08:41 pmQuote from: whitelancer64 on 05/22/2018 08:37 pmQuote from: Comga on 05/22/2018 08:34 pmSeparate subject.Sometime before launch, during LOX loading, there was significant venting from the TEL. Big vapor clouds.Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.It was not a judgment, I was not saying anything was wrong or unexpected. It's just something I had not noticed before.I was told that any LOX being released would be a safety issue and wouldn't happen.Does anyone here have insight into the nature of this?When the webcast is up on YouTube perhaps a screenshot can be captured.Occasional large vents have been seen before. What you're describing doesn't sound unusual. Not a large vent cloud.Something solid or liquid and cold. Dense enough to fall like a stone but dissipating as it falls.Again, I am not saying it's bad or different, just something I have not noticed on previous launches.Have been told it cannot be LOX. (Even had the comment edited out by a mod, as is his right.)But what could it be?A screenshot would help. A collage of stills with the feature in question circled in red.It is more evident when watching the video.Gas venting puffs out. The tips of these fall under gravity and dissipate.
I guess it must not have been important since no one else has mentioned it, but I wonder what was the snake-like piece of debris that separated from the second stage at SECO-1. It looked like a piece of hose or cable.
Brilliant NASA photographer Bill Ingalls always produces great images. He always asks himself, how close can I put my camera to the rocket launch for the best shot? The rocket answered.
Iridium sats at 86.71 degree inclination. I need to learn how to do the TLE conversion for the orbit height.
Quote from: gongora on 05/22/2018 11:30 pmIridium sats at 86.71 degree inclination. I need to learn how to do the TLE conversion for the orbit height.Here's how:#The the 8th field of line 2, that's the revolutions per day. From this find the semi-major axis in km from Kepler's law and GM for earth:sma = (8681663.653/rpd)^(2/3); print "sma=", sma; #The fifth field is the eccentricity. It's of the form "0.XXXXXX", but only the XXXXXX is given, the "0." is assumede = ("0." $5) + 0.0; print "e=", e; #Now given the semi-major axi and the eccentricity, find the apogee and perigee. These are computed from the center of the Earth, so subtract the# Earth's radius (6371 km)p = sma * (1-e) - 6371; print "perigee =", p;a = sma * (1+e) - 6371; print " apogee =", a;Here's an example to try:1 26934U 01044A 14144.63398148 .00000000 00000-0 00000-0 0 022 26934 97.0335 276.7823 0001902 124.8490 48.3766 15.68826283 01sma= 6740.4e= 0.0001902perigee = 368.114apogee = 370.678
Quote from: rickl on 05/22/2018 11:55 pmI guess it must not have been important since no one else has mentioned it, but I wonder what was the snake-like piece of debris that separated from the second stage at SECO-1. It looked like a piece of hose or cable.It might also just have been LOX that froze in that shape.
Quote from: Lars-J on 05/23/2018 12:15 amQuote from: rickl on 05/22/2018 11:55 pmI guess it must not have been important since no one else has mentioned it, but I wonder what was the snake-like piece of debris that separated from the second stage at SECO-1. It looked like a piece of hose or cable.It might also just have been LOX that froze in that shape.It was flexible and sitting on the (probably very hot) GG exhaust duct, so I rather doubt frozen LOX. Didn't look like it was connected to anything, so not hose or cable. Maybe a piece of mylar tape or insulation?
Quote from: LouScheffer on 05/23/2018 12:32 amQuote from: gongora on 05/22/2018 11:30 pmIridium sats at 86.71 degree inclination. I need to learn how to do the TLE conversion for the orbit height.Here's how:#The the 8th field of line 2, that's the revolutions per day. From this find the semi-major axis in km from Kepler's law and GM for earth:sma = (8681663.653/rpd)^(2/3); print "sma=", sma; #The fifth field is the eccentricity. It's of the form "0.XXXXXX", but only the XXXXXX is given, the "0." is assumede = ("0." $5) + 0.0; print "e=", e; #Now given the semi-major axi and the eccentricity, find the apogee and perigee. These are computed from the center of the Earth, so subtract the# Earth's radius (6371 km)p = sma * (1-e) - 6371; print "perigee =", p;a = sma * (1+e) - 6371; print " apogee =", a;1 43478U 18047C 18142.95257369 .00000034 00000-0 00000+0 0 99942 43478 86.7101 239.9250 0153544 332.9069 117.8366 14.89094608 17I got 504x718, which doesn't seem right (or maybe I just can't do math tonight)
Quote from: gongora on 05/22/2018 11:30 pmIridium sats at 86.71 degree inclination. I need to learn how to do the TLE conversion for the orbit height.Here's how:#The the 8th field of line 2, that's the revolutions per day. From this find the semi-major axis in km from Kepler's law and GM for earth:sma = (8681663.653/rpd)^(2/3); print "sma=", sma; #The fifth field is the eccentricity. It's of the form "0.XXXXXX", but only the XXXXXX is given, the "0." is assumede = ("0." $5) + 0.0; print "e=", e; #Now given the semi-major axi and the eccentricity, find the apogee and perigee. These are computed from the center of the Earth, so subtract the# Earth's radius (6371 km)p = sma * (1-e) - 6371; print "perigee =", p;a = sma * (1+e) - 6371; print " apogee =", a;
GRACE-FO satellites cataloged in 483 x 505 km orbits, Iridium 110, 147, 152, 161 and 162 cataloged in 494 x 710 km orbits. The Falcon 9 second stage was deorbited after deploying the sats.
Hmmm, I guess it is around there.Tweet from Jonathan McDowell:QuoteGRACE-FO satellites cataloged in 483 x 505 km orbits, Iridium 110, 147, 152, 161 and 162 cataloged in 494 x 710 km orbits. The Falcon 9 second stage was deorbited after deploying the sats.
A camera was toasted by the Falcon 9 today... https://www.facebook.com/story.php?story_fbid=10156135691076233&id=506906232QuoteBrilliant NASA photographer Bill Ingalls always produces great images. He always asks himself, how close can I put my camera to the rocket launch for the best shot? The rocket answered.
