[TD1-L08E1] This morning (Feb 20), the touchdown operation began! Today, we are preparing for the spacecraft to descend, which is an operation involving just a few people. The descent begins tomorrow (Feb 21)!
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[TD1 - L08E1] Today (2/21) 12: 36 (JST), the decision to begin the touchdown operation was declared as "GO". While the descent start time is delayed about 5 hours, the speed to 5km altitude will be increased slightly so there is no change to the scheduled time for touchdown.
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[TD1-L08E1] On February 21 at 13:45 JST, the Doppler data confirms that the spacecraft had started to descend. The descent speed was about 90 cm/s. This is swifter than the scheduled 40 cm/s, as the delay in the descent start time meant we increased the descent speed.
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[TD1-L08E1] On February 21 at 16:00 JST, the altitude of the spacecraft (distance from Ryugu) was about 12 km. The altitude is decreasing smoothly.
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[TD1-L08E1] We have begun showing the latest navigation images! http://www.hayabusa2.jaxa.jp/en/galleries/onc/nav20190221/ … This image was received on 2/21 at 15:54 JST. Please note, real-time images cannot be obtained immediately before & after touchdown (due to spacecraft orientation).pic.twitter.com/WtzonOIF5T
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[TD1-L08E1] Today’s ground station operations was from the US Goldstone station until dawn, then to Usuda station and after that it moved across to Canberra and now operation is from Madrid. Check out Haya2NOW to see who we’re talking through! http://haya2now.jp/
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[TD1-L08E1] February 21 at 17:00 JST: the altitude of the spacecraft has passed 9 km. This is the time confirmed in the control room. It takes about 19 minutes for the radio waves to be transmitted from Hayabusa2, so this will be from 19 minutes ago.
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[TD1-L08E1] At a spacecraft altitude of 6500m (around 2/21 at 17:30 JST), the speed of the spacecraft was slowed to about 40 cm/s. This is the initial descent speed and means we are now back to our original descent plan.
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[TD1-L08E1] February 21 at 19:10 JST. We have confirmed the speed of the spacecraft has slowed to 10cm/s. Altitude is about 5,000m. From here, we are in a slow approach to Ryugu. Gate 2 is confirmed as “GO” to continue the operation as now.
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[TD1-L08E1] The schedule for the touchdown operation is now on our website. (Exact times may change during the operation.) http://www.hayabusa2.jaxa.jp/en/topics/20190221e_TD1-L08E1_Schedule/ …pic.twitter.com/VkXV8MHabo
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[TD1-L08E1] February 21 at around 23:15 JST, the altitude has passed 3000m.
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Would you like to see footage of our operations over the last year that led up to
#haya2_TD? This is the “Hayabusa2 Operation Digest 2018!” https://www.youtube.com/watch?v=f_2cKL3z6nk … (We’re sorry, this is only in Japanese but we hope still fun to watch!)Näytä tämä ketju -
In the live webcast tomorrow, we will use this “Hayabusa2 Trajectory Viewer”: http://www.lizard-tail.com/isana/hayabusa2/misc/hy2trj3d/ … with much thanks to its creators ©Isana Kashiwai & Go Miyazaki. Try moving with the mouse! And do not forget to check-out http://haya2now.jp/ to see what we’re up to now
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