Author Topic: LIVE: SpaceX Dragon CRS-2 (SpX-2) FD-2, FD-3 & Berthed Operations UPDATES (Read 183863 times)

Chris Bergin · « **Reply #40 on:** 03/02/2013 08:28 pm »

What we already know, but it's the SpaceX presser:

International Space Station Program and SpaceX managers Saturday gave the go-ahead for the SpaceX¹s Dragon spacecraft to rendezvous with the station on Sunday, March 3.

Dragon is scheduled to be captured Sunday at 6:01 a.m. EST by NASA Expedition 34 Commander Kevin Ford and NASA Flight Engineer Tom Marshburn. Once grappled, Dragon will be installed onto the Earth-facing port of the Harmony module by ground experts at mission control in Houston. The cargo vehicle will be bolted into place through commands by Flight Engineer Chris Hadfield of the Canadian Space Agency.

A SpaceX Livestream will be available at spacex.com/webcast.

Chris Bergin · « **Reply #41 on:** 03/02/2013 08:47 pm »

NASA Kennedy / KSC ‏@NASAKennedy
NASA TV coverage of rendezvous and grapple on Mar. 3 will begin at 3 a.m. EST. Tune in online at http://www.nasa.gov/ntv

JimO · « **Reply #42 on:** 03/02/2013 10:43 pm »

So they had sufficient prop magin to go high and drift back -- nice luxury. It's exactly the maneuver that Liss described yesterday. They didn't have to take two days to lap forward, they just used the reserve gas to set up a drift backwards. Way to astrogate, SpaceX team!

ugordan · « **Reply #43 on:** 03/02/2013 10:49 pm »

Quote from: JimO on 03/02/2013 10:43 pm

So they had sufficient prop magin to go high and drift back -- nice luxury.

At the preflight conference, Shotwell said they could cope with a 200x200 km insertion instead of the planned 200x325 one in the event of another F9 engine-out. Maybe they allocated some additional Dragon propellant reserve for that possibility, just in case.

rdale · « **Reply #44 on:** 03/02/2013 11:19 pm »

Grapple delayed to 6:31am EST per NASA JSC.

Chris Bergin · « **Reply #45 on:** 03/02/2013 11:19 pm »

NASA ‏@NASA
Updated @SpaceX #Dragon #ISS rendezvous times: NASA TV coverage begins Sunday at 3:30amET: http://www.nasa.gov/ntv . Grapple at 6:31am.

Targeteer · « **Reply #46 on:** 03/02/2013 11:56 pm »

Quote from: Chris Bergin on 03/02/2013 11:19 pm

NASA ‏@NASA
Updated @SpaceX #Dragon #ISS rendezvous times: NASA TV coverage begins Sunday at 3:30amET: http://www.nasa.gov/ntv . Grapple at 6:31am.

Possible reasons--orbital mechanics, TDRS coverage, lighting...?

Chris Bergin · « **Reply #47 on:** 03/03/2013 02:13 am »

Resilient CRS-2 Dragon in pursuit of ISS for Sunday berthing:
http://www.nasaspaceflight.com/2013/03/resilient-crs-2-dragon-pursuit-iss-sunday-berthing/

Reviewed the troubleshooting via some of the L2 CRS-2 coverage info and previewed berthing. Will update the article during the milestones.

ChrisC · « **Reply #48 on:** 03/03/2013 02:50 am »

Here is my rough estimate for approach and berthing timeline. I checked and didn't find anything in:
- the NSF article that ChrisB just posted
- the SpaceX press kit
- this thread

... so I went to the CRS-1 thread from last October and based off of what I found there:

05:09:06 AM...02...08...33...59...Range: 1,150 feet; 180 degree yaw maneuver
05:14:06 AM...02...08...38...59...Depart 1,150 feet
05:22:06 AM...02...08...46...59...Range: 820 feet
05:32:06 AM...02...08...56...59...Depart 820 feet
06:26:06 AM...02...09...50...59...Range: 100 feet
06:40:06 AM...02...10...04...59...100 feet departure
06:58:06 AM...02...10...22...59...Capture point arrival
07:14:06 AM...02...10...38...59...Go for capture
07:22:06 AM...02...10...46...59...CAPTURE

Note again: the above is NOT today's timeline; it's from CRS-1 in October.

So, based on the above:
Capture - 1h50m = 250 meter (820 foot) departure
Capture - 0h42m = 30 meter (100 foot) departure
Capture - 0h24m = Capture point arrival

Now referencing to the planned 6:31am ET capture:
4:41am ET = 250 meter (820 foot) departure
5:49am ET = 30 meter (100 foot) departure
6:07am ET = Capture point arrival

Times are obviously rough estimates. I just needed to know what time to set my alarm clock for. Corrections welcome.

EDIT: thanks jcm for the confirmation

I have now edited and refined the above information.

jcm · « **Reply #49 on:** 03/03/2013 02:55 am »

Quote from: ChrisC on 03/03/2013 02:50 am

Do we have an approximate timeline for approach and berthing?

I will continue digging, and will edit in here if I find anything, but I already know it's not in:
- the NSF article that ChrisB just posted
- the SpaceX press kit
- this thread

I'm heading off now to go check the CRS-1 thread ...

I just need to know what time to set my alarm clock for

We know grapple is planned for 1131 GMT and begin of berthing ops around 1340 GMT. If it follows CRS-1, we would have
R-bar Grapple minus 2h7m -> 0924 GMT
250m hold 0947 GMT
30-m hold 1045 GMT
Grapple 1131 GMT

jcm · « **Reply #50 on:** 03/03/2013 03:03 am »

Quote from: ChrisC on 03/03/2013 02:50 am

Do we have an approximate timeline for approach and berthing?

EDIT: thanks jcm for the confirmation

Maybe we should start a betting pool over on the party thread?
Oh wait no, I need to crash early if I am going to make 5am EST

Targeteer · « **Reply #51 on:** 03/03/2013 05:46 am »

The crew is awake and has completed the CCP set up in the cupola--apparently early. Now off to breakfast--for them and for me.

Targeteer · « **Reply #52 on:** 03/03/2013 06:07 am »

Dragon in sight according to Kevin

Targeteer · « **Reply #53 on:** 03/03/2013 06:10 am »

Does anyone know if the visiting vehicle officer display link will be activated during the approach? It is not now.

http://spacestationlive.jsc.nasa.gov/displays/index.html

Targeteer · « **Reply #54 on:** 03/03/2013 06:30 am »

Dragon is 6 km behind and 1.4 km below according to the DPC

Targeteer · « **Reply #55 on:** 03/03/2013 06:31 am »

Capture around half an hour early at 1100 if I heard correctly

Targeteer · « **Reply #56 on:** 03/03/2013 07:08 am »

Dragon range is 1000m

Space Pete · « **Reply #57 on:** 03/03/2013 07:11 am »

See that little white dot on the ISS feed? That's a Dragon, I think!

Space Pete · « **Reply #58 on:** 03/03/2013 07:19 am »

Quote from: Targeteer on 03/03/2013 06:10 am

Does anyone know if the visiting vehicle officer display link will be activated during the approach? It is not now.

http://spacestationlive.jsc.nasa.gov/displays/index.html

See here:

http://spacestationlive.jsc.nasa.gov/displays/vvoDisplay1.html

marshallsplace · « **Reply #59 on:** 03/03/2013 07:25 am »

Live picture of ISS: