Author Topic: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING (ATTEMPT 1) UPDATES  (Read 43320 times)

Offline psloss

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #40 on: 09/22/2013 10:27 PM »
No confirmation of re-attempt on Tuesday yet from the DPC.
Given the situation, I wouldn't be surprised if this goes back to the IMMT tomorrow, assuming the team(s) are ready to proceed.

Online Targeteer

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #41 on: 09/22/2013 10:32 PM »
I think this is short of confirming an attempt on Tuesday but it explains the 48 hour delay

Cygnus Rendezvous Delayed 48 Hours. Orbital Sciences has confirmed Sunday morning, around 1:30 a.m. EDT, its Cygnus spacecraft established direct data contact with the International Space Station (ISS) and found that some of the data received had values that it did not expect, causing Cygnus to reject the data. This mandated an interruption of the approach sequence. Orbital has subsequently found the causes of this discrepancy and is developing a software fix. The minimum turnaround time to resume the approach to the ISS following an interruption such as this is approximately 48 hours due to orbital mechanics of the approach trajectory. - courtesy of NASA; more: http://www.nasa.gov/content/cygnus-rendezvous-delayed-48-hours
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline psloss

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #42 on: 09/22/2013 10:40 PM »
I think this is short of confirming an attempt on Tuesday but it explains the 48 hour delay

Cygnus Rendezvous Delayed 48 Hours. Orbital Sciences has confirmed Sunday morning, around 1:30 a.m. EDT, its Cygnus spacecraft established direct data contact with the International Space Station (ISS) and found that some of the data received had values that it did not expect, causing Cygnus to reject the data. This mandated an interruption of the approach sequence. Orbital has subsequently found the causes of this discrepancy and is developing a software fix. The minimum turnaround time to resume the approach to the ISS following an interruption such as this is approximately 48 hours due to orbital mechanics of the approach trajectory. - courtesy of NASA; more: http://www.nasa.gov/content/cygnus-rendezvous-delayed-48-hours
That's using some of the same words as the first Orbital update on their microsite this morning.


Online Chris Bergin

I think this is short of confirming an attempt on Tuesday but it explains the 48 hour delay

I would also note we have a full 10 paragraphs added from L2:

http://www.nasaspaceflight.com/2013/09/cygnus-cots-graduation-iss-berthing/


Online Chris Bergin

And a final revision of the article above now live thanks to Pete....who helped despite being on holiday! What a legend!

Online dsmillman

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #45 on: 09/23/2013 08:42 AM »
This mornings' ISS DPC indicates that the software patch has not yet been uplinked to Cygnus.  Also Cygnus is an orbit above the ISS to position itself to start the rendezvous tonght.

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #46 on: 09/23/2013 01:49 PM »
The crew was just advised to cancel several Cygnus related events and there was mention of more cancellations tomorrow.
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Online Chris Bergin

The crew was just advised to cancel several Cygnus related events and there was mention of more cancellations tomorrow.

Well that seems to rule out a Tuesday attempt. We'll see if there's confirmation coming.
« Last Edit: 09/23/2013 02:07 PM by Chris Bergin »

Offline psloss

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #48 on: 09/23/2013 02:08 PM »
Are you saying current efforts have failed? Put pay - not a very american phrase.
Answered my own question, looked in British dictionary. Failed
They may need more time and there's not much before the Soyuz rendezvous, which takes priority.  That doesn't necessarily mean the efforts have failed.

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #49 on: 09/23/2013 02:13 PM »
The crew was just advised to cancel several Cygnus related events and there was mention of more cancellations tomorrow.

Karen stated she literally had nothing left to do the rest of the day. Cygnus events were evidently being saved for the end of the workday to allow time for the Cygnus reprogramming and approval process to work. 
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline psloss

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #50 on: 09/23/2013 02:16 PM »
Orbital confirms Tuesday is off on microsite.
http://www.orbital.com/Antares-Cygnus/

Excerpt:
Quote
This morning, Orbital and NASA together decided to postpone the approach, rendezvous, grapple and berthing operations of the Cygnus cargo logistics spacecraft with the International Space Station until after the upcoming Soyuz crew operations are complete. The Soyuz crew is due to arrive at the ISS very late on Wednesday, September 25. The earliest possible date for the next Cygnus approach and rendezvous with the ISS would be Saturday, September 28. An exact schedule will be determined following the successful completion of Soyuz operations.
« Last Edit: 09/23/2013 02:17 PM by psloss »


Offline newpylong

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #52 on: 09/23/2013 02:20 PM »
Good test of on-orbit activities/duration anyway...

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #53 on: 09/23/2013 03:11 PM »
Bruce Manners (NASA COTS Proj Exec) is being interviewed on the daily ISS update.  Confirms earliest date is Saturday and mentions getting rest for personnel in orbit prepping for Soyuz docking and ground personnel working on fault resolution and solution approval
« Last Edit: 09/23/2013 03:17 PM by Targeteer »
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline John44

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #55 on: 09/23/2013 06:59 PM »
No Cygnus updates from the evening DPC.  The crew will be conducting some EMU HUT work tomorrow as an added task due to the delay.
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline Kabloona

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #56 on: 09/23/2013 08:25 PM »
In a NASA Spaceflight.com article (http://www.nasaspaceflight.com/2013/09/cygnus-cots-graduation-iss-berthing/), it describes the following approach to solving the GPS problem between ISS and Cygnus:

"The simple fix is to add “1024″ (the difference in week numbers between the 1980 and 1999 ephemeris) to the data received from the PROX system, which only requires modification of a single instruction in the Cygnus software."

However, is it really that simple?  There have been 13 leap seconds between 1980 and 1999. Slapping a 1024 week offset on the code does not strike me as a very precise solution.

There's an excellent discussion of the differences, including the leap second issue, which Orbital is no doubt aware of,  here:
http://forum.nasaspaceflight.com/index.php?topic=31845.msg1099999#msg1099999

Meanwhile, let's keep this thread open for updates only.

Offline russianhalo117

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Re: LIVE: Orbital Cygnus ORB-D RNDZ and BERTHING UPDATES
« Reply #57 on: 09/23/2013 10:21 PM »
NET Saturday. Huge weekend coming up!

Latest Rev:

http://www.nasaspaceflight.com/2013/09/cygnus-cots-graduation-iss-berthing/
Here is official NASA Public Announcement:
LINK: http://www.nasa.gov/content/cygnus-rendezvous-postponed-to-no-earlier-than-saturday/index.html#.UkC96xajT8s

Cygnus Rendezvous Postponed to No Earlier Than Saturday
Sept 23, 2013

Managers from Orbital Sciences and NASA decided Monday morning to postpone the approach, rendezvous, grapple and berthing operations of Orbital's Cygnus cargo logistics spacecraft with the International Space Station to no earlier than Saturday, Sept. 28. Cygnus' rendezvous now will follow the launch and arrival of three crew members of Expedition 37/38 on Wednesday, Sept. 25. Michael Hopkins of NASA and Oleg Kotov and Sergey Ryazanskiy of the Russian Federal Space Agency (Roscosmos) will depart from the Baikonur Cosmodrome in Kazakhstan at 4:58 p.m. EDT and arrive at the space station at 10:47 p.m.

Orbital has confirmed that over the past 24 hours, the Orbital team developed and tested a software fix for the data format mismatch that necessitated a postponement of the first rendezvous operation that was scheduled for the early morning of Sunday, Sept. 22. However, that process, together with the impending Soyuz crew operations, resulted in a tight schedule to the point that both Orbital and NASA felt it was the right decision to postpone the Cygnus approach and rendezvous until after Soyuz operations.

An exact schedule for Cygnus will be determined following the successful completion of Soyuz operations. For the latest information about Cygnus and Orbital's demonstration cargo resupply mission, visit Orbital's page at: http://www.orbital.com/Antares-Cygnus
Expedition 37 crew members aboard the space station now will have an off-duty day in advance of a busy week ahead. This includes Tuesday's Cygnus rendezvous, followed by preparations for the arrival of three new crew members Wednesday. Michael Hopkins of NASA and Oleg Kotov and Sergey Ryazanskiy of the Russian Federal Space Agency (Roscosmos) will depart from the Baikonur Cosmodrome in Kazakhstan at 4:58 p.m. EDT aboard a Soyuz spacecraft.

Cygnus launched Wednesday aboard an Antares rocket at 10:58 a.m. EDT from NASA’s Wallops Flight Facility in Virginia after a 24 hour delay due to poor weather preventing its roll-out to the launch pad.

It has several demonstration objectives it must complete before NASA approves its capture by the Canadarm2 and its berthing to the Harmony node. The Cygnus has already achieved three of its demonstration objectives during its first two days in orbit. The vehicle first demonstrated its position and control ability, or its ability to orient itself in space; second, the vehicle turned off its engines and operated while in free drift; third, Cygnus conducted a demonstration abort maneuver.

› View Cygnus mission briefing graphics
› Read about Cygnus’ launch

Before any new cargo craft can approach and rendezvous with the station for the first time it must meet a set of objectives to prove its capabilities before it is finally captured or docked. The resupply craft is followed closely by mission controllers on its way to the station. When the spacecraft reaches certain points along its trajectory the flight director polls mission controllers before giving the “go/no-go” decision to proceed to its next point.

As Cygnus meets its demonstration objectives and moves closer to the space station, Expedition 37 Flight Engineers Luca Parmitano and Karen Nyberg will be watching and working in tandem with Mission Control. Parmitano will be in the cupola at the Canadarm2 controls monitoring its approach. Nyberg will be his back up at the secondary robotics workstation inside the Destiny laboratory.

When Cygnus meets its final demonstration objective of pointing a tracking laser at a reflector on the Kibo laboratory it will move to its capture point about 10 meters from the station. Cygnus will turn off its thrusters, operating in free drift, and Parmitano will maneuver the Canadarm2 to grapple and capture the new resupply craft.

After capture, Parmitano will operate the Canadarm2 to move Cygnus and attach it to the Harmony node. The hatches to Cygnus are planned to be opened following leak checks and power connections.

Orbital Sciences is the second company to send a commercial cargo craft to the space station. SpaceX was the first company to send its own cargo ship with two successful commercial resupply missions and two demonstration missions under its belt.

Online Chris Bergin

Now aiming for Sunday RNDZ and Berthing, per L2's rolling coverage for this mission.

Online Chris Bergin

MMT on Friday to decide when the next attempt can take place, per NASA TV just now.

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