Hayabusa 2 (Хаябуса-2), Procyon – H-IIA F26 – Танэгасима – 03.12.2014 04:22:04 UTC

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 6 ч. назад

[TD1-R3] Today we begin our descent for the 3rd touchdown rehearsal! Goal is to confirm the accuracy of navigation control at low altitude via:
・Altitude measurement & spacecraft control by LRF (Laser Range Finder).
・If OK, Target Marker (TM) separation.
・Tracking of TM.

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 6 ч. назад

[TD1-R3] October 24 at 13:00 JST: We have confirmed the spacecraft has begun its descent from the home position (about 20km altitude) as planned. The rate of descent is similar to previous descent operations at 40cm/s.

[tnt22]

http://www.hayabusa2.jaxa.jp/en/topics/20181024e_TD1-R3_Schedule/

TD1-R3 operation schedule

The third touchdown rehearsal will be performed between October 23 – 25. The purpose of this rehearsal is to use the measured value recorded by the LRF (Laser Range Finder), that performs the altitude measurement at short distances, to control the spacecraft. If this is successful, we will also separate one of the target markers (TM) and attempt to track the detached TM. These operations will allow us to confirm the accuracy of the navigation guidance control at low altitudes of about 20m.

Спойлер

Main schedule for the TD1-R3 operation

[TH]Date & Time（UTC）[/TH][TH]Date & Time（JST）[/TH][TH]Spacecraft speed (cm/s)[/TH][TH]HP altitude (m)[/TH][TH]Near-point altitude (m)[/TH][TH]Event[/TH]

10/22 23:30	10/23 08:30	0	20,000		Communication via Usuda Deep Space Center begins
10/23 08:20	10/23 17:20				Communication via Madrid DSN begins
10/23 16:00	10/24 01:00				Comm. via Goldstone DSN begins
10/23 23:00	10/24 08:00				Comm, via Usuda begins
10/23 23:40	10/24 08:40				Preparation for descent begins
10/24 03:40	10/24 12:40	-40	20,000		Begin descent
10/24 06:40	10/24 15:40				Comm. via Canberra begins
10/24 08:20	10/24 17:20				Comm. via Madrid begins
10/24 08:30	10/24 17:30		13,000
10/24 14:00	10/24 23:00	-10	5,000		Decelerate descent speed ΔV
10/24 16:10	10/25 01:10				Comm. via Goldstone begins
10/24 22:40	10/25 07:40			1,500
10/24 23:00	10/25 08:00				Comm, via Usuda begins
10/25 01:20	10/25 10:20			500
10/25 02:00	10/25 11:00			250
10/25 02:30	10/25 11:30	0		20	Target Marker (TM) release
10/25 02:50	10/25 11:50	50		20	Ascent ΔV
10/25 03:20	10/25 12:20			900
10/25 04:10	10/25 13:10			2,600
10/25 06:40	10/25 15:40				Comm. via Canberra begins
10/25 08:20	10/25 17:20				Comm. via Madrid begins

Notes：

[/li]
• Time: Approximate schedule time (in 10 minute increments). There is a possibility that this may change during operation. The time is the onboard time, so confirmation of the event is the radiowave propagation time of about 18 minutes later.
• Spacecraft speed: This is the speed relative to the asteroid (minus is towards the asteroid, positive is away). Numerical value is displayed only when speed control is performed. After a speed control operation, the speed changes due to the gravitational force of Ryugu and other celestial bodies.
• HP altitude: Distance to the center of Ryugu.
• Near point altitude: Distance to the surface of Ryugu.
  

Schematic of the TD1-R3 operation


[Enlargement]
Fig.1 Schematic of the TD1-R3 operation

TD1-R3 low altitude sequence


[Enlargement]
Fig.2 TD1-R3 low altitude sequence

Note : Target Marker


[Enlargement]
Fig.3 Note : Target Marker

[свернуть]

Hayabusa2 project
2018.10.24

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 5 ч. назад

[TD1-R3] October 24 at 15:20 JST: The altitude of the spacecraft is about 16 km (10 miles).

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 54 мин. назад

[TD1-R3] We have begun real time delivery of the navigation images from the ONC-W1 (Optical Navigation Camera - Wide angle): http://www.hayabusa2.jaxa.jp/en/galleries/onc/nav20181024/ ...

This image was received on October 24 at 18:48 JST.

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 28 мин. назад

[TD1-R3] October 24 at 19:30 JST: The distance to Ryugu is about 10km. In the control room, the message from "リュウグウノツカイ" (Ryugu-no-tsukai: the Japanese for oarfish) reflects the desires of the control team members: "Trajectory control ΔV, smaller is better!"

[tnt22]

Объявление

HAYABUSA2@JAXA‏ @haya2e_jaxa 12 мин. назад

On Thursday 25 October (tomorrow) at 12:15 EDT / 16:15 UTC / (26 October) 01:15 JST, tune in to the DPS (Division of Planetary Science meeting) press briefing to hear about Hayabusa2! https://aas.org/media-press/aas-press-conference-webcasts ...

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 12 мин. назад

[TD1-R3] October 24 at 22:20 JST: the distance to the asteroid is now 6km. This is the eighth time we have descended to this distance!

[tnt22]

23:40 JST: Зонд опустился до высоты 4.5 км. Скорость снижения уменьшена с 40 см/с до 10 см/с

小惑星探査機「はやぶさ２」‏Подлинная учетная запись @haya2_jaxa 18 мин. назад

【TD1-R3】10月24日 23:40 JST: 高度約4.5kmにて降下速度を秒速40cmから10cmに減速しました。

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 29 мин. назад

[TD1-R3] October 25 at 03:40 JSR: The LIDAR altitude is about 3km. Ryugu is rotating and the candidate landing selection site, L08-B, is approaching below the spacecraft. After one more rotation, we will be in our closest approach. This navigation image was received at 03:27 JST.




28 мин. назад

[TD1-R3] October 26 at 06:35 JST: The distance to Ryugu has passed 2km.

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 3 мин. назад

[TD1-R3] October 25 at 07:50 JST: the distance to Ryugu is now 1.5km. This image was taken at about 07:30 JST.

[tnt22]

В 9:10 JST 25 октября зонд опустился до отметки 1000 м над поверхностью астероида

小惑星探査機「はやぶさ２」‏Подлинная учетная запись @haya2_jaxa 2 мин. назад

【TD1-R3】10月25日 9:10 JST：リュウグウまでの距離が約1000mになりました。

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 3 мин. назад

[Live relay from the control room: 11:00~ JST] During today's touchdown rehearsal, there will be a live relay from the control room including commentary by project members! Please tune-in below at 11:00 JST / 22:00 EDT.

EN: http://youtu.be/v1w-3hMkkXE  

[tnt22]

10:35 JST 25 октября: 500 м до поверхности Рюгю

小惑星探査機「はやぶさ２」‏Подлинная учетная запись @haya2_jaxa 3 мин. назад

【TD1-R3】10月25日 10:35 JST：リュウグウまでの距離が500mを切りました。

[tnt22]

Jonathan McDowell‏Подлинная учетная запись @planet4589 6 мин. назад

Ryugu-Earth one-way light travel time today is 18 min 47 sec.

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 27 мин. назад

[TD1-R3] October 25 at 11:00 JST: The transition to autonomous descent phase is "GO". The X & Y directions of the spacecraft's position will continue to be controlled from the ground (Earth) but at an altitude of 25m, a fully autonomous mode will begin. Altitude now is ~300m.

[tnt22]

11:40 JST: до поверхности 100 м

小惑星探査機「はやぶさ２」‏Подлинная учетная запись @haya2_jaxa 48 сек. назад

【TD1-R3】10月25日 11:40 JST：高度100mを切りました。

[tnt22]

Jonathan McDowell‏Подлинная учетная запись @planet4589 27 сек. назад

Confirmation that MINERVA-II rovers are still alive on the surface of Ryugu! (They have solar cells, unlike MASCOT which had batteries, now dead)

[tnt22]

Elizabeth Tasker‏ @girlandkat 3 мин. назад

The MINERVA-II1 rovers are powered by their solar battery. So when it's night on the asteroid, they snooze. They only take images in the daylight. In the form of 6 pins, the surface thermometers have worked well on the rovers.
#AsteroidLanding

[tnt22]

HAYABUSA2@JAXA‏ @haya2e_jaxa 2 мин. назад

[TD1-R3] October 25, 12:06 JST: Confirmation that the spacecraft has begun to rise. Near the lowest point, the low-gain antenna (LGA) were in use & telemetry wasn't possible. The spacecraft velocity was monitored with Doppler Data. Low altitude circumstances to be confirmed later