Advanced Land Observing Satellite 3
NamesDaichi 3
Mission typeRemote sensing
Mission duration13 minutes and 55 seconds
Spacecraft properties
ManufacturerMitsubishi Electric
Start of mission
Launch date7 March 2023 1:38:15 UTC [1]
Launch siteTanegashima LP2
ContractorMitsubishi Heavy Industries
End of mission
DisposalDestroyed via FTS
Last contactMarch 7 2023 1:55 approximately
Decay dateMarch 7 2023
Orbital parameters
Reference systemGeocentric
OPS: OPtical Sensor
IRS: InfraRed Sensor[2]
← ALOS-2
ALOS-4 →

Advanced Land Observing Satellite 3 (ALOS-3), also called Daichi 3, was a 3-ton Japanese satellite launched on March 7 2023. It was to succeed the optical sensor PRISM (Panchromatic Remote-sensing Instruments for Stereo Mapping) carried on the ALOS satellite, which operated from 2006 to 2011. The ALOS-2 satellite and the future ALOS-4 satellite carry synthetic-aperture radar.

The satellite was launched as the payload on the first launch of the H3 rocket in March 2023. A failure of the second stage engine to ignite led to the rocket along with its payload ALOS-3 being destroyed by use of Flight Termination System (FTS) to prevent risk of falling debris.

Spacecraft details

ALOS-3 has a mass of 3 tonnes, and 7 reaction wheels.[3]

This section needs expansion. You can help by adding to it. (March 2023)


ALOS-3 launched from Tanegashima, Japan by a H3 rocket on 7 March 2023.[1] Previously the launch was scheduled for 17 February but was aborted seconds before liftoff.[4]


MET Time Date(UTC) Event
X-22:00:00 12:37:55 03:37:55 6

March 2023

1st Go/No-Go Decision
X-18:00:00 16:37:55 07:37:55 Airframe movement (VAB > LP2)
X-12:00:00 22:37:55 14:37:55 2nd Go/No-Go Decision
X-00:57:00 09:40:55 00:40:55 7

March 2023

3rd Go/No-Go Decision
X-00:10:00 10:27:55 01:27:55 Final Go/No-Go Decision
X-00:08:00 10:29:55 01:29:55 Start of Countdown
X-00:07:00 10:30:55 01:30:55 Safety System ready
X-00:07:00 10:30:55 01:30:55 Completion of Firing System Preparation
X-00:05:00 10:32:55 01:32:55 Satellite System ready
X-00:04:00 10:33:55 01:33:55 Automatic Countdown Sequence Start
X-00:04:00 10:33:55 01:33:55 Start of Pressurization of each tank
X-00:02:50 10:35:05 01:35:05 Power Switching (External to Internal)
X-00:00:55 10:37:00 01:37:00 Completion of each tank Pressurization
X-00:00:53 10:37:02 01:37:02 Frame deflector operation
X-00:00:35 10:37:20 01:37:20 Water Curtain operation
X-00:00:18 10:37:37 01:37:37 Flight mode on
X-00:00:15 10:37:40 01:37:40 Single-Stage Thermal battery activation
X-00:00:15 10:37:40 01:37:40 All System are ready
X-00:00:12. 10:37:43. 01:37:43 Pyrotechnic Torch Ignition
X-00:00:06 10:37:49 01:37:49 LE-9 Engine Start
X+00:00:00 10:37:55 01:37:55 SRB-3 Engine Start & Liftoff
X+00:01:06 10:39:01 01:39:01 Max Q
X+00:01:56 10:39:51 01:39:51 SRB-3 Jettision
X+00:03:32 10:41:27 01:41:27 Satellite Fairing Separation
X+00:04:56 10:42:51 01:42:51 Main Engine Cutoff (MECO)
X+00:05:04 10:42:59 01:42:59 1st and 2nd Stage Separation
X+00:13:55 10:51:50 01:51:50 Flight Interruption

Mission and sensors

If successfully launched, ALOS-3 would have been an Earth observation satellite and was to be used to monitor natural disasters as well as for cartography.[3] ALOS-3 carried OPS (OPtical Sensor), a multi-band optical camera which is an upgrade from the PRISM sensor.[2] OPS was capable of observing a 70-kilometer (43 mi) wide strip of land on Earth.[5] In addition to the RGB and infrared band covered by the predecessor ALOS satellite, ALOS-3 has two additional bandwidths: coastal and red edge. Coastal allows observation underwater up to a depth of 30m, while red edge was to be used to monitor vegetation growth.[5]

See also


  1. ^ a b "Launch Time and Launch window of the First H3 Launch Vehicle (H3TF1)Carrying the Advanced Land Observing Satellite-3 "DAICHI-3" (ALOS-3)" (Press release). JAXA. March 5, 2023. Retrieved March 7, 2023.
  2. ^ a b "先進光学衛星「だいち3号」概要説明書" (PDF) (in Japanese). JAXA. Retrieved 2023-03-07.
  3. ^ a b JAXA, JAXA (February 17, 2023). "h3 presskit" (PDF). JAXA (in Japanese). pp. 57pp. Retrieved 2023-02-17.
  4. ^ Clark, Stephen (February 17, 2023). "First launch of Japan's H3 rocket aborted moments before liftoff". Spaceflight Now. Retrieved 2023-03-07.
  5. ^ a b Akiyama, Ayano (February 16, 2023). "射点に登場 打上げを待つJAXA新型基幹ロケット「H3」と12年ぶりの光学地球観測衛星「だいち3号」". Yahoo! Japan (in Japanese). Retrieved 2023-03-07.