| Auto: | all |
| Advanced Land Observing Satellite 3 | |
| Names List: | Daichi 3 |
| Mission Type: | Remote sensing |
| Operator: | JAXA |
| Mission Duration: | 13 minutes and 55 seconds |
| Manufacturer: | Mitsubishi Electric |
| Launch Date: | 7 March 2023 1:38:15 UTC [1] |
| Launch Rocket: | H3-22S |
| Launch Site: | Tanegashima LP2 |
| Launch Contractor: | Mitsubishi Heavy Industries |
| Disposal Type: | Destroyed via FTS |
| Last Contact: | March 7 2023 1:55 approximately |
| Decay Date: | March 7 2023 |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Sun-synchronous |
| Apsis: | gee |
| Instruments: | OPS: OPtical Sensor IRS: InfraRed Sensor |
| Previous Mission: | ALOS-2 |
| Next Mission: | ALOS-4 |
Advanced Land Observing Satellite 3 (ALOS-3), also called Daichi 3, was a 3-ton Japanese satellite launched on March 7 2023 which failed to reach orbit. 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 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.
ALOS-3 had a mass of 3 tonnes, and 7 reaction wheels.
ALOS-3 launched from Tanegashima, Japan by a H3 rocket on 7 March 2023.[1] Initially the launch was scheduled for 17 February but was aborted seconds before liftoff.[2]
| MET | Time | Date(UTC) | Event | |
|---|---|---|---|---|
| JST | UTC | |||
| X-22:00:00 | 12:37:55 | 03:37:55 | 6 March2023 | 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 March2023 | 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 | |
If it had been 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.[4] OPS was capable of observing a 70km (40miles) 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]