ALOS-3

Japanese satellite

Advanced Land Observing Satellite 3Names| Daichi 3

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Mission type| Remote sensing
Operator| JAXA
Website| www.jaxa.jp/projects/sat/alos3/index_j.html
Mission duration| 13 minutes and 55 seconds
Spacecraft properties
Manufacturer| Mitsubishi Electric
Start of mission
Launch date| 7 March 2023 1:38:15 UTC [1]
Rocket| H3-22S
Launch site| Tanegashima LP2
Contractor| Mitsubishi Heavy Industries
End of mission
Disposal| Destroyed via FTS
Last contact| March 7 2023 1:55 approximately
Decay date| March 7 2023
Orbital parameters
Reference system| Geocentric
Regime| Sun-synchronous
Instruments
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 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.

## Spacecraft details

[edit]

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

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

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## Launch

[edit]

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.[4]

### Timeline

[edit]

MET | Time  | Date(UTC) | Event

|
|
|

JST | UTC
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

[edit]

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.[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

[edit]

* Spaceflight portal

* 2023 in spaceflight

## References

[edit]

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.

## External links

[edit]

* Official website
* H3×ALOS-3 Special Site (JAXA)
* ALOS-3, PASCO CORPORATION

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Orbital launches in 2023

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January|

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February|

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March|

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September|

* Starlink G6-13 (22 satellites)
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October|

* Yaogan 39-03 (3 satellites)
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November|

* TJS-10
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* ChinaSat 6E
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* ION SCV-015 (Lemur-2 NANAZ, OSW Cazorla, Unicorn-2J, Unicorn-2K), Aether-1, Aether-2, FalconSAT-X, ICEYE × 4, Pelican-1, B1B2 Barry, Flock-4q × 36, Lemur-2 × 10, PEARL-1C, PEARL-1H, Platform 5, STORK-7 / Aman-1
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* Starlink G6-29 (23 satellites)
* Kosmos 2572 / Razdan 1
* Starlink G6-30 (23 satellites)

December|

* Progress MS-25
* ION SCV-012 (Unicorn × 3), EIRSAT-1, Hayasat-1
* Starlink G6-31 (23 satellites)
* Starlink G6-33 (23 satellites)
* Starlink G7-8 (22 satellites)
* Yaogan 39-05 (3 satellites)
* Reusable Experimental Spacecraft
* Yaogan 41
* Starlink G6-34 (23 satellites)
* Kosmos 2573 / Bars-M 5L
* Starlink G6-32 (23 satellites)
* SARah-2, SARah-3
* Shiyan 24C-01, Shiyan 24C-02, Shiyan 24C-03
* BeiDou-3 M25, BeiDou-3 M26
* Kosmos 2574 / Razbeg No.1
* USA-349 / X-37B OTV-7
* Starlink G6-36 (23 satellites)

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