QZS-3 (MICHIBIKI No. 3) – H-2A (F35) – Танегасима – 19.08.2017 05:29 UTC

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Трансляция на японском началась
 

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http://h2a.mhi.co.jp/en/mission/countdown/h2a_f35.html

August 19, 2017 13:59 JST
X-30 minutes

It is 30 minutes before launch.

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08/19/2017 08:02
Now less than 30 minutes from the planned launch of the H-2A rocket.

Officials gave the "go" to enter the terminal count, which began at 0429 GMT (12:29 a.m. EDT). The final hour of the countdown will prepare the rocket, the payloads, and ground systems for flight.

Спойлер

The H-2A rocket for today's launch is flying in the "204" configuration with four large 15-meter-long (49-foot) solid rocket boosters and without any of the smaller strap-on boosters sometimes used to augment the launcher's thrust.

It also features the H-2A's rarely-used 5.1-meter (16.7-foot) diameter nose shroud, which encloses the Michibiki 3 spacecraft for the first few minutes of flight through the lower atmosphere.

The lead contractor for the H-2A rocket is Mitsubishi Heavy Industries.

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08/19/2017 08:07
There are 22 minutes left in today's countdown before liftoff of the H-2A rocket with Michibiki 3, a Japanese navigation satellite designed to improve the accuracy of space-based positioning and timing services over East Asia.

Спойлер

Michibiki 3 weighs about 4 metric tons, or approximately 8,800 pounds, at the time of launch. It was built by Mitsubishi Electric Corp. in Japan.

The spacecraft will broadcast four L-band navigation signals circular geostationary orbit nearly 22,300 miles (35,800 kilometers) over the equator.

Michibiki 3 is the third satellite designed for Japan's Quasi-Zenith Satellite System, which aims to improve navigation accuracy in Japan, especially in urban areas and rough terrain where skyscrapers and terrain block GPS signals.

Japan plans to deploy four members of the QZSS fleet. The first stations launched in September 2010 and this past June 1, and another is due for launch before the end of this year.

Michibiki 3 is designed for a 15-year service life.

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08/19/2017 08:08
Some statistics on today's launch:

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• 35th H-2A launch since 2001
• 48th H-2 family launch since 1994
• 4th launch of the H-2A (204) configuration
• 4th launch from Tanegashima in 2017
• 50th space launch attempt worldwide in 2017
  

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Spaceflight101 LIVE‏ @S101_Live 8 мин. назад

#QZS3 is transitioned to battery power well ahead of the X-4.5-minute auto sequence to be ready for its ride into orbit. #HIIA

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08/19/2017 08:14
T-minus 15 minutes. Engineers are uploading the latest upper level wind data into the H-2A's flight computer. The rocket will use the information to compute a specific steering profile based on the real launch day weather conditions.

Спойлер

At liftoff, the H-2A will be propelled upward from the launch pad on the power of a single hydrogen-burning LE-7A main engine and two solid rocket motors. The total liftoff thrust of the rocket is approximately 2.5 million force pounds.

The rocket will pitch east from Tanegashima, racing through the speed of sound in less than a minute and reaching an altitude of more than 30 miles in the first two minutes of flight.

After consuming their pre-packed solid propellant, the two strap-on boosters will jettison at about the two-minute point. The 16.7-foot diameter payload shroud will separate at T+plus 3 minutes, 45 seconds after the H-2A rocket ascends above the discernable traces of Earth's atmosphere.

First stage main engine cutoff, stage separation and ignition of the second stage's LE-5B engine will between six-and-a-half and seven minutes into the mission. The second stage will burn more than four minutes before shutting down at T+plus 11 minutes, 23 seconds.

After a 12-minute coast, the second stage will reignite for a 4-minute burn.

Deployment of the Michibiki 3 satellite is expected at T+plus 28 minutes, 40 seconds.

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08/19/2017 08:16
T-minus 12 minutes. In the final minutes of the countdown, an automated sequencer will control the final crucial steps before launch.

Спойлер

The automatic sequence will begin at T-minus 4 minutes, 30 seconds and computers will pressurize the H-2A's propellant tanks for flight at about T-minus 4 minutes, 20 seconds.

At about T-minus 3 minutes, the launcher will transition to internal battery power and remove external power.

Water will be released onto the launch pad deck beginning at T-minus 73 seconds to help suppress sound and acoustics during the ignition and liftoff. The vehicle's pyrotechnic and ordnance systems will be armed at T-minus 30 seconds and the rocket's guidance system initializes at T-minus 18 seconds.

Batteries controlling solid rocket booster ignition are activated at T-minus 15 seconds.

Sparklers underneath the rocket's main engine ignite at T-minus 11.7 seconds to burn off residual hydrogen that could be an explosive hazard at main engine start.

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08/19/2017 08:18
T-minus 10 minutes. The Michibiki 3 spacecraft should soon be operating on internal battery power as the satellite and launcher are configured for liftoff at 0529 GMT (1:29 a.m. EDT).

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Spaceflight101 LIVE‏ @S101_Live 4 мин. назад

Ground Track Map & Timeline of today's #HIIA launch with #QZS3: http://bit.ly/2vXORY0 

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Spaceflight101 LIVE‏ @S101_Live 57 сек. назад

X-6 Min: #HIIA enters its Automated Countdown Sequence at X-4.5 minutes to transition to its launch configuration. http://bit.ly/2wPOoEI

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08/19/2017 08:23
T-minus 5 minutes, 30 seconds. The weather is acceptable for launch today, according to JAXA.

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Spaceflight101 LIVE‏ @S101_Live 41 сек. назад

The first step of the Automated Countdown Sequence is the termination of propellant loading and pressurization of the 1st stage tanks.

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http://h2a.mhi.co.jp/en/mission/countdown/h2a_f35.html

August 19, 2017 14:24 JST
Automatic countdown sequence to start
 
It is 4 minutes and 40 seconds before liftoff. The automatic countdown sequence has started.

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Spaceflight101 LIVE‏ @S101_Live 56 сек. назад

X-3 Minutes: The #HIIA launcher is now switching to battery power. Tanks on the first stage are securing. http://bit.ly/2wPOoEI

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