Author Topic: LIVE: SpaceX Falcon 9/Dragon CRS-2 (SpX-2) LAUNCH and FD-1 UPDATES (Read 278932 times)

yg1968 · « **Reply #360 on:** 03/01/2013 06:13 pm »

Quote from: Galactic Penguin SST on 03/01/2013 06:10 pm

I heard on the ISS update feed that SpaceX is making progress in recovering the propellant system, but will not make it in time for making burns for rendezvous tomorrow.

Progress is good news!

Lars_J · « **Reply #361 on:** 03/01/2013 06:14 pm »

Quote from: joncz on 03/01/2013 06:08 pm

Quote from: mdo on 03/01/2013 05:56 pm
... In terms of phase angle the two spacecraft currently approach each other at a rate of about 7.8 deg/hour or 185 deg/day (in terms of revs/day: ISS 16.04, Dragon 15.52).

Shouldn't these be reversed? ISS - 15.52 revs/day, and Dragon 16.04? Otherwise, how is Dragon overtaking ISS?

Dragon is in a lower orbit.

mmeijeri · « **Reply #362 on:** 03/01/2013 06:15 pm »

Let's try not to contribute to the rumour mill. Is this "progress" simply the earlier report of the #3 thruster pod pressure trending in the right direction, or is this new information?

Galactic Penguin SST · « **Reply #363 on:** 03/01/2013 06:17 pm »

Quote from: mmeijeri on 03/01/2013 06:15 pm

Let's try not to contribute to the rumour mill. Is this "progress" simply the earlier report of the #3 thruster pod pressure trending in the right direction, or is this new information?

Dunno, this was reported by someone at MCC-H to Kevin Ford over the ISS comm link. I more or less just paraphrase it.

yg1968 · « **Reply #364 on:** 03/01/2013 06:19 pm »

Quote from: mlindner on 03/01/2013 06:11 pm

Quote from: Galactic Penguin SST on 03/01/2013 06:10 pm
I heard on the ISS update feed that SpaceX is making progress in recovering the propellant system, but will not make it in time for making burns for rendezvous tomorrow.

I've seen several people talking about this feed, but I haven't seen a link for it. Could this be linked?

I believe that it is this one:
http://www.ustream.tv/channel/live-iss-stream

mlindner · « **Reply #365 on:** 03/01/2013 06:20 pm »

Quote from: Lars_J on 03/01/2013 06:14 pm

Quote from: joncz on 03/01/2013 06:08 pm
Quote from: mdo on 03/01/2013 05:56 pm
... In terms of phase angle the two spacecraft currently approach each other at a rate of about 7.8 deg/hour or 185 deg/day (in terms of revs/day: ISS 16.04, Dragon 15.52).

Shouldn't these be reversed? ISS - 15.52 revs/day, and Dragon 16.04? Otherwise, how is Dragon overtaking ISS?

Dragon is in a lower orbit.

Lower orbit is a higher angular rate. Dragon has to be higher number.

Lars_J · « **Reply #366 on:** 03/01/2013 06:22 pm »

Yep, mlinder, I misread. Sorry!

Galactic Penguin SST · « **Reply #367 on:** 03/01/2013 06:23 pm »

For Chris or any NSF coverage reporters:

Johnson Space Center ‏@NASA_Johnson
News teleconference coming up at 2PM Central. Media need to call 321-867-2468 to get the dial-in information and passcode.

yg1968 · « **Reply #368 on:** 03/01/2013 06:26 pm »

Quote from: Galactic Penguin SST on 03/01/2013 06:23 pm

For Chris or any NSF coverage reporters:

Johnson Space Center ‏@NASA_Johnson
News teleconference coming up at 2PM Central. Media need to call 321-867-2468 to get the dial-in information and passcode.

Can somebody record this? It will not be on NASA TV.

emerrill · « **Reply #369 on:** 03/01/2013 06:27 pm »

While I don't know if it will, usually these telecons will be listenable here:
http://www.nasa.gov/news/media/newsaudio/index.html

emerrill · « **Reply #370 on:** 03/01/2013 06:29 pm »

Yup, they updated the site, it will be live at
http://www.nasa.gov/news/media/newsaudio/index.html

corrodedNut · « **Reply #371 on:** 03/01/2013 06:35 pm »

Dragon will pass under the ISS in one hour.

"...ask it to breath a little fire when it does."

Galactic Penguin SST · « **Reply #372 on:** 03/01/2013 06:35 pm »

MCC-H called Kevin Ford to look out for the Dragon in an hour, currently ~930 km behind/beneath the ISS.

Space Pete · « **Reply #373 on:** 03/01/2013 06:36 pm »

Per the ISS live feed - Dragon is 930km behind ISS, will pass directly under ISS in about 1 hour. So closure rate of 930 kilometers per hour.

jcm · « **Reply #374 on:** 03/01/2013 06:37 pm »

Space-track catalogs the expected 4 objects

39115-39118 2013-010A to D

Orbit 205 x 319 km x 51.7 deg
(rel to 6378 km sphere)
cf SpaceX report of
199 x 323 km x 51.7 deg
(probably rel to geoid which is different)

Patchouli · « **Reply #375 on:** 03/01/2013 06:37 pm »

Hopefully there's nothing time critical in the cargo if it does end up taking a few days to fix the problem and attempt another rendezvous.

JimO · « **Reply #376 on:** 03/01/2013 06:45 pm »

It's not too early to ask, but maybe in bad taste: what is the expected orbital lifetime of an inert 'Dragon' in its current orbit? If thrusters are not required, are we looking at an unguided random reentry?

Danderman · « **Reply #377 on:** 03/01/2013 06:45 pm »

I hope everyone here understands that distance from ISS is not a critical factor - what IS critical is the orbital plane - every minute that Dragon is not at the same altitude as ISS, its orbital plane diverges from ISS, due to precession.

At the current difference in altitude, Dragon's orbital plane will precess by some fraction of a degree each day, not counting the upcoming drop in altitude caused by drag (the drop in the altitude will result in even more precession).

Someone here can probably calculate the actual precession rate, but its probably a matter of 5 or 6 days in this relative position before the precession makes later rendezvous very difficult. If it looks like the thrusters can be fixed, but it will take time, it might be worthwhile for SpaceX to attempt to raise orbital apogee a bit to buy some time, even with just one thruster.

Robotbeat · « **Reply #378 on:** 03/01/2013 06:47 pm »

Quote from: JimO on 03/01/2013 06:45 pm

It's not too early to ask, but maybe in bad taste: what is the expected orbital lifetime of an inert 'Dragon' in its current orbit? If thrusters are not required, are we looking at an unguided random reentry?

I'm not actually sure about the first question (don't know Dragon's altitude, though someone does), but Dragon isn't inert. With one thruster pod, you still can have partial attitude control.

Jim · « **Reply #379 on:** 03/01/2013 06:48 pm »

Quote from: Robotbeat on 03/01/2013 06:47 pm

Quote from: JimO on 03/01/2013 06:45 pm
It's not too early to ask, but maybe in bad taste: what is the expected orbital lifetime of an inert 'Dragon' in its current orbit? If thrusters are not required, are we looking at an unguided random reentry?
I'm not actually sure about the first question (don't know Dragon's altitude, though someone does), but Dragon isn't inert. With one thruster pod, you still can have partial attitude control.

like a one armed man in a row boat