Author Topic: HTV-1 mission updates  (Read 27078 times)

Offline rdale

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Re: HTV-1 mission updates
« Reply #20 on: 09/16/2009 02:08 AM »
HTV Update: The IMMT (ISS Mission Management Team) last night gave a unanimous Go for HTV Prox Ops, under two conditions:

    * With inhibit for Gyro Data Comparison by FDIR (Failure Detection, Isolation & Recovery);
    * With Reset Filter command sent to SIGI (Space Integrated GPS/Inertial Navigation System) filters after the PCM3 maneuver, and FDIR enabled during Prox Ops (after Reset, filter performance has been shown to be stable for 20-24 hours)


On FD5 (11:07 pm last night), the vehicle performed a nominal MD2 burn for a phasing adjustment. As of 11:48pm, HTV was 18,000 km behind and 90 km below ISS. It continues its planned trajectory for rendezvous with the ISS, and consumables remain within normal limits.

Offline jscman

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Re: HTV-1 mission updates
« Reply #21 on: 09/16/2009 02:26 AM »
Remember that what you are seeing is the ground track of the two vehicles and not the orbit plane strictly speaking.  At the time of this snapshot, the ISS and HTV are several thousands of kilometers apart from each other along the same orbit.  Let's play a thinking game:

Say that the ISS is at its most northern part of its ground track and the HTV was at the most southern part of its ground track.  And let's say that they are in exactly the same plane and the same orbital height.  Fast forward one-half revolution.  Now the HTV is at its most northern portion of its orbit.  Is it over the same spot as ISS was one-half orbit ago?  NO.  Why?  Remember that the Earth rotated on its own axis over that half orbit so when HTV comes flying by it won't be over the same spot even though it is in the same orbit.  This is what you are seeing.


They might really be in different planes at this point, too. Capture and berthing is several days away and there's a lot of differential nodal regression between now and then...
Of course they are in slightly different planes at this point (very slightly).  HTV, being lower, will have a slight higher nodal regression than ISS with the design such that by capture day, the planes will be aligned with the additional help of the small plane correction burns along the way.  My point was that even if two objects are in the exact same orbit (with the exception of true anomaly) then their ground tracks would STILL be different.  I was using that example to drive home that what the reader was seeing on the world map was not the planar separation, but proof that the Earth rotates beneath the orbit.  Yes, the orbital planes are slightly separated, but that wasn't what the reader was "seeing".  In fact, when HTV passed below ISS the other day, their orbital tracks in MCC were right on top of each other on the world map - just as they should be (given the resolution of the screen and thickness of the lines on the map).

Offline wjbarnett

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Re: HTV-1 mission updates
« Reply #22 on: 09/16/2009 11:34 AM »
Then why is that Progress/Soyuz do not show their own separate orbit/groundtrack lines on the worldmap? I don't remember ATV showing different lines either...
« Last Edit: 09/16/2009 11:35 AM by wjbarnett »
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Offline rdale

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Re: HTV-1 mission updates
« Reply #23 on: 09/17/2009 12:57 AM »
For tomorrow's HTV rendezvous, Nicole Stott & Bob Thirsk unstowed and set up the HHL (Hand Held Lidar) with battery and night scope to check out its functionality, then switched it off and temporarily stowed it. It will be used during the Japanese vehicle's R-Bar approach. [The Hand Held Lidar (Light Detection & Ranging), used before on the Shuttle, employs a laser light beam for measuring distance and velocity. Range or speed data are obtained by shooting out light pulses (generally one mark per second) with a trigger, which are then reflected back into the instrument and converted to numerical data (either velocity or range, selected by toggle).]

HTV Update: Since yesterday, the HTV has performed four nominal burns using the Main Engines:
PCM1 (9/15, 2:51pm EDT),
HAM1 (9/15, 8:01pm),
M2 (9/15, 9:31pm),
PM2 (9/15, 10:18 pm).

On FD6 (last night, 11:30 pm), the vehicle was 5,300 km behind and 33 km below ISS. It continues its planned trajectory for rendezvous with the ISS, and consumables remain within normal limits.

Offline jscman

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Re: HTV-1 mission updates
« Reply #24 on: 09/17/2009 02:09 AM »
Then why is that Progress/Soyuz do not show their own separate orbit/groundtrack lines on the worldmap? I don't remember ATV showing different lines either...
Whether or not a vehicle's ground track is shown on the world map is controllable by GC. In the ISS FCR, we don't always show the rendezvousing vehicle's ground track mainly because it is not really needed and it makes the world map busier, especially near the Russian Ground Stations (RGS) and near the nodal crossings where each vehicle's orbit number can cover the other's (although orbit numbers are also controllable on/off - I think - I'm not a GC).  The purple color that is being used for HTV is not too bothersome/cluttering although it is a little hard to see, really.

Offline yoichi

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Re: HTV-1 mission updates
« Reply #25 on: 09/17/2009 09:15 AM »
http://iss.jaxa.jp/en/htv/news/htv1_fd08.html

HTV-1 continues nominal rendezvous maneuvering toward final approach phase
Last Updated: September 17, 2009

On Flight Day 8 (FD8), the HTV-1 is set to perform a series of rendezvous maneuvers toward the final approach to the ISS.

On Flight Day 7 (FD7), the HTV-1 raised its orbit with a height adjustment maneuver. The HTV-1 is now flying in a near-circular orbit with apogee altitude 324 km and perigee altitude 305 km. During the FD8’s rendezvous flight, the HTV-1 will perform two height adjustment maneuvers at 6:24 p.m. and 9:27 p.m. September 17 respectively to catch up to the ISS orbit.

Once the HTV-1 reaches “proximity communications zone”, 23km from the ISS, the HTV-1 will establish communications with the Proximity Communication System (PROX) that is installed on Kibo, and will continue to approach using the Relative GPS Navigation until it reaches the “Approach Initiation (AI) point”, 5 km behind the ISS.

At 0:30 a.m. September 18, the HTV-1 will begin to move from the AI point to a point 500 meters below the ISS (RI point). From the RI point, the nadir side of the ISS, the HTV-1 will slowly move upward to the ISS.

When the HTV-1 reaches 10 m below the ISS, the HTV thrusters will be disabled. Then, the ISS Expedition 20 Flight Engineer Nicole Stott will manipulate the station’s robotic arm (SSRMS) and grapple the HTV-1 at around 4:50 a.m. September 18. The berthing operations is expected to begin at around 7:00 a.m. September 18.
During these robotics operations, JAXA Astronaut Akihiko Hoshide will be on console at the Mission Control Center (MCC-H) of NASA’s Johnson Space Center (JSC) as ISS CAPCOM. He will support the operations from the ground.

We will start the next HTV-1 Mission update from 0:00 a.m. September 18, with live blogging on the HTV-1’s final approach / capturing / berthing.

Offline joncz

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Re: HTV-1 mission updates
« Reply #26 on: 09/17/2009 10:14 AM »
All times listed in Yoichi's update are JST, which is UTC +9.

Offline Wisi

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Re: HTV-1 mission updates
« Reply #27 on: 09/17/2009 03:34 PM »
According to NASA TV the HTV is 3 miles form the station...

Online dsmillman

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Re: HTV-1 mission updates
« Reply #28 on: 09/17/2009 03:36 PM »
It has been reported that the HTV has executed the Approach Initiation burn.

Offline Chandonn

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Re: HTV-1 mission updates
« Reply #29 on: 09/17/2009 03:38 PM »
There is a LIVE thread for this now.

Offline Wisi

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Re: HTV-1 mission updates
« Reply #30 on: 09/17/2009 03:41 PM »
There is a LIVE thread for this now.

Sorry, just saw it now  :)

Offline Chandonn

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Re: HTV-1 mission updates
« Reply #31 on: 09/22/2009 02:33 AM »
Latest on the HTV mission:

"The crew members spent time transferring cargo from the HTV and brushing up on robotics procedures. Flight Engineers Michael Barratt, Nicole Stott, Frank De Winne and Robert Thirsk will employ these procedures Wednesday when they use the space station’s robotic arm, Canadarm2, to grapple and remove the Exposed Pallet of science experiments from inside the hull of the Japanese cargo craft. Canadarm2 will then hand the pallet off to the Japanese Kibo laboratory’s robotic arm, and it will be mated to the Exposed Facility science platform at the back end of Kibo. Thursday, the experiments will be grappled and released individually for installation on the Exposed Facility. The Exposed Pallet will be returned to the HTV Friday. "

http://www.nasa.gov/mission_pages/station/main/index.html


So (all dates in US time):

- 9/23: the EP will be handed to the Japanese Arm, then berthed on the JEF
- 9/24: the HREP and SMILES experiments will be transferred from the EP to the JEF
- 9/25: the EP will be transferred back to the HTV

This is a bit behind the timeline from the HTV-1 Press Kit (which, I believe, was scheduled to begin yesterday), but in keeping with the flexibility of the first HTV mission.  Mission duration is also fluid at this point, as posted by Anik yesterday on the Schedule OF ISS Flight Events thread (http://forum.nasaspaceflight.com/index.php?topic=61.msg481359#new).

Online dsmillman

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Re: HTV-1 mission updates
« Reply #32 on: 09/23/2009 12:26 PM »
According to the ISS mission audio the HTV EP is being berthed now on the JEF.

Online dsmillman

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Re: HTV-1 mission updates
« Reply #33 on: 09/23/2009 01:37 PM »
According to ISS mission audio, all ready to latch indicators  are green and the JAXA MCC will complete the berthing.
« Last Edit: 09/23/2009 01:37 PM by dsmillman »

Online dsmillman

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Re: HTV-1 mission updates
« Reply #34 on: 09/23/2009 02:43 PM »
EP install on JEF is now complete.

Offline Fuji

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HREP installation.

Offline Fuji

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SMILES installation.

Offline anik

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Re: HTV-1 mission updates
« Reply #37 on: 09/26/2009 06:39 AM »
HTV Exposed Pallet returned back into HTV Unpressurized Logistics Carrier
Last Updated: September 26, 2009

http://iss.jaxa.jp/en/htv/news/htv_ep_back.html

On Flight Day 16 (FD16), robotics operations to re-stow the HTV Exposed Pallet (EP) in the HTV Unpressurized Logistics Carrier (ULC) began at 6:07 p.m. [09:07 UTC - anik] September 25.

The EP was unberthed from Kibo’s Exposed Facility (EF) with Kibo’s robotic arm (JEMRMS) at 6:07 p.m. The EP was then handed off to the station’s robotic arm (SSRMS) from the JEMRMS, and at 10:20 p.m. [13:20 UTC - anik], the EP was reinstalled into the ULC with the SSRMS.

The robotic operations to reinstall the EP into the ULC required the ISS crew member’s delicate and fine robotic manipulation. The ISS crewmember deftly maneuvered the SSRMS, and flawlessly inserted the EP into the aperture of the ULC.

With the completion of this EP reinstallation, all the activities planned outside of the ISS during the HTV-1’s berthed operation were finished.
Aboard the ISS, the ISS crew members will continue transfer operation between the HTV Pressurized Logistics Carrier (PLC) and the ISS. After all the supplies are unloaded from the PLC, the PLC will then be loaded with trash and other discarded items from the ISS.

The HTV-1’s departure and reentry are expected at the beginning of this November. The HTV-1 Mission schedule will vary depending on the HTV-1 mission progress and the ISS operations timeline.
« Last Edit: 09/26/2009 06:41 AM by anik »

Offline anik

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Re: HTV-1 mission updates
« Reply #38 on: 10/18/2009 07:17 PM »
Quote from ISS On-Orbit Status 10/18/09:

"HTV release is scheduled for 12:05pm [16:05 UTC - anik] on 10/30, HTV thruster activation (HCP retreat command) at 12:05:30pm [16:05:30 UTC - anik], followed by four flightpath control maneuvers"

Offline anik

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Re: HTV-1 mission updates
« Reply #39 on: 10/20/2009 05:50 PM »
Quote from ISS On-Orbit Status 10/19/09:

"Up to 787 kg could be loaded onto HTV1, with a current maximum pegged at 725 kg, which required a time-consuming process of prioritizing all disposed items, supported with the IMS and ground-produced lists. Further JAXA analysis may allow additional margin above 725 kg max. The Russian trash request initially was 50 kg, plus additional items up to total of approximately 160 kg. The late changes have obligated the HTV Flight Control Team to recalculate and fine tune more than 100 parameters for proper GNC (Guidance, Navigation & Control) of the spacecraft during its departure on 10/30"

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