Fwd: CYGNUS UPDATE: Pending Station MMT approval tomorrow, Cygnus rendezvous now is Sunday...

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From: "Moon, Larry J. (JSC-EA411)" <larry.j.moon@nasa.gov>
Date: September 26, 2013 10:41:57 AM GMT-06:00
To: "Moon, Larry J. (JSC-EA411)" <larry.j.moon@nasa.gov>
Subject: FW: CYGNUS UPDATE: Pending Station MMT approval tomorrow, Cygnus rendezvous now is Sunday...

 

 

Now that Soyuz TMA-10M has arrived, Orbital's Cygnus cargo spacecraft returns to center stage - ready for rendezvous, capture and berthing to the station's Harmony nadir docking port. Just after midnight Central today, all four of Cygnus' flight computers were rebooted to address the processor "exception" issue and a software patch was loaded to fix the relative GPS issue as well.  The procedure was completed by 2:38 am CDT. Cygnus is healthy and on a safe trajectory with respect to that of the station with all GNC systems nominal.

 

Attached and below is the latest rendezvous timeline courtesy of the ISS Flight Control Team's Visiting Vehicle Officer (VVO). It picks up early Sunday with the "Go/No Go for Joint Ops." Remember that approval of this plan is awaiting approval by the station's Mission Management Team, which meets tomorrow (Friday) morning…

 

Go Cygnus!

 

 

 

CYGNUS DEMO-1 RENDEZVOUS TIMELINE

 

Sunday           September 29

 

  CDT               EDT              EVENT

12:38 am         1:38 am       Go / No-Go for Joint Operations

  2:01 am          3:01 am        Joint Targeting Reference Point (JTRP) Arrival

  2:08 am         3:08 am       Go / No-Go 1 (Approach Delta Velocity 1 & 2)

  2:16 am          3:16 am        ADV1 Rndv Burn

  2:59 am          3:59 am        ADV2 Rndv Burn

  3:03 am          4:03 am        Disable SCAN (Range 3.7 statute miles / 6 km)

  3:18 am          4:18 am        Station begins maneuver to docking attitude (~5 min)

  3:23 am          4:23 am        Station in docking attitude

  3:23 am         4:23 am       Go / No-Go (ADV3 & 4)

  3:30 am         4:30 am       NASA TV RENDEZVOUS COVERAGE BEGINS

  3:38 am          4:38 am        ADV3 (AI) Rndv Burn

  3:46 am          4:46 am        Range 1000 meters (3,280 feet)

  3:52 am          4:52 am        ADV4 Rndv Burn

  4:10 am          5:10 am        First 250 meter arrival (820 feet)

  4:15 am          5:15 am        First 250 meter departure

  4:18 am          5:18 am        Retreat Demo start

  4:24 am          5:24 am        Retreat Demo end / Second 250 meter arrival

  4:29 am          5:29 am        Second 250 meter departure

  4:32 am          5:32 am        Hold Demo start / 220 meter arrival (722 feet)

  5:12 am         6:12 am       Go / No-Go inside Keep-Out Sphere (KOS)

  5:12 am          6:12 am        Capture Attempt 1 (earliest Go) – Sunrise + 1 min

  5:17 am          6:17 am        Departure from 220 meter hold point

  5:26 am          6:26 am        Capture Attempt 1 (earliest Capture Point arrival)

  5:27 am          6:27 am        Range 100 meters (328 feet)

  5:41 am          6:41 am        30 meter Hold Point arrival (98 feet)

  5:56 am          6:56 am        30 meter Hold Point departure

  6:05 am          7:05 am        Capture Point arrival

  6:10 am         7:10 am       Go / No-Go for capture

  6:13 am          7:13 am        Station attitude hold with Desats inhibited

  6:15 am         7:15 am       CYGNUS CAPTURE (Station arm grapple)

  6:17 am          7:17 am        Station to attitude control (U.S. thrusters only)

  8:15 am          9:15 am        Cygnus berth to Harmony nadir docking port begins

~10:20 am     11:20 am        Cygnus berth complete (2^nd stage capture)

  Noon              1:00 pm       NASA TV: Cygnus post capture news conference

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