ALOS-4

Japanese satellite

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Advanced Land Observing Satellite 4Names| ALOS-4 * Daichi 4

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Mission type| Remote sensing
Operator| JAXA
COSPAR ID| 2024-123A
SATCAT no.| 60182
Website| www.jaxa.jp/projects/sat/alos4/index_j.html
Mission duration| 344 days, 2 hours, 28 minutes
(elapsed)
Spacecraft properties
Manufacturer| Mitsubishi Electric
Start of mission
Launch date| 1 July 2024, 03:06:00 (2024-07-01UTC03:06Z) UTC
Rocket| H3-22S
Launch site| Tanegashima, LA-Y2
Contractor| Mitsubishi Heavy Industries
Orbital parameters
Reference system| Geocentric
Regime| Sun-synchronous
Instruments
PALSAR-3: Phased Array Type L-band Synthetic Aperture Radar-3
SPAISE3: SPace based AIS Experiment 3rd

<- ALOS-3

ALOS-5 ->

Advanced Land Observing Satellite 4 (ALOS-4), also called Daichi 4 (daichi is a Japanese word meaning "great land"), is a 3,000 kg (6,600 lb) Japanese L-band synthetic-aperture radar (SAR) satellite that was launched on July 1, 2024. It carries PALSAR-3 (Phased Array type L-band Synthetic Aperture Radar-3), which is a successor to the PALSAR-2 on ALOS-2 satellite. ALOS-4 is the fourth satellite which carries L-band SAR operated by JAXA, following JERS-1, ALOS, and ALOS-2.

## Features

[edit]

The ALOS ("Daichi") series is characterized by achieving both high spatial resolution and wide observation swath, as well as continuous imaging capability. Among them, the radar satellites are equipped with the PALSAR series of L-band synthetic aperture radar, which allows for effective penetration into vegetation to observe ground surfaces and crustal movements compared to other radar satellites using bands such as X- or C-band. ALOS-4 is further enhanced from ALOS-2 by equipping the new PALSAR-3 synthetic aperture radar, which employs the new digital beamforming SAR technology. While the observation range in spotlight mode with a resolution of 1 m x 3 m was 25 km square for ALOS-2, ALOS-4 enables observation over a 35 km square area. Additionally, while the observation swath of the high-resolution mode with a resolution of 3 m was 50 km for ALOS-2, ALOS-4 achieves a swath of 200 km with the same resolution. Furthermore, while the observation swath of the wide-area observation mode with a resolution of 100 m was 350 km for ALOS-2, ALOS-4 achieves a swath of 700 km with a resolution of 25 m. By achieving an unprecedented combination of high spatial resolution and wide observation swath, the high-resolution mode observation of the entire Japan area, which was possible only four times a year with ALOS-2, will be possible 20 times a year (once every two weeks) with ALOS-4. Because ALOS-2 is still in operation after the launch of ALOS-4, these two satellites are expected to operate simultaneously as a constellation.

## Monitoring of disasters

[edit]

Following the 2024 Noto earthquake, ALOS-2 conducted observation of the Noto Peninsula, which took one week to complete. ALOS-4 meanwhile will be capable of observing the same swath by passing overhead of the area only once.[1]

## See also

[edit]

* Spaceflight portal

* iQPS
* 2024 in spaceflight

## References

[edit]

1. ^ "Advanced Land Observing Satellite-4 PRESS KIT" (PDF) (in Japanese). JAXA. June 28, 2024. Retrieved 2024-07-01.

## External links

[edit]

* Official website
* ALOS-4×H3 Special Site (JAXA)

* v
* t
* e

Japanese space program

* Italics indicates projects in development.
* Symbol † indicates failed projects.
* ~~Strikethrough lines~~ indicate cancelled projects.

Space agencies

| National space agencies|

* JAXA
* former ISAS
* NAL
* NASDA
* NICT
* JSS

|

Joint development partners|

* United States NASA1
* ESA2
* Italy ASI3
* Canada CSA4
* Russia Roscosmos5
* Brazil AEB6
* INPE7
* India ISRO8

Astronomical observation

| Past|

* Akari
* ASCA
* ASTRO-E†
* ~~Astro-G~~
* CORSA†
* Ginga
* Hakucho
* HALCA
* Hinotori
* Hitomi†
* ~~SPICA~~
* Suzaku
* Tenma
* Yohkoh

|

Active|

* Hinode
* Hisaki
* XRISM1

Future|

* ATHENA2
* SOLAR-C1
* GREX-PLUS [ja]
* HiZ-GUNDAM [ja]
* LAPYUTA
* LiteBIRD
* Nancy Grace Roman Space Telescope1
* JASMINE

Communications satellites, broadcasting satellites and satellite navigation systems

| Past|

* BS
* 2X
* 3H
* 3N
* Kakehashi
* Kirari
* Kizuna
* Kodama
* MBSat
* N-STAR
* a
* b
* Sakura (1
* 2a
* 2b
* 3a
* 3b)
* Yuri
* 1
* 2a
* 2b
* 3a
* 3b

|

Active|

* Kirameki
* 1
* 2
* Michibiki
* 1
* 2
* 3
* 4
* 1R
* MTSAT
* N-STAR
* c
* d
* JDRS

Future|

* DSN
* 3
* QZS
* 5
* 6
* 7

Earth observation

| Past|

* Akebono
* Daichi
* 1
* 3†
* Denpa
* Fuyo-1
* Jikiken
* Kyokko
* Midori
* I
* II
* Momo
* 1
* 1b
* Ohozora
* Taiyo
* TRMM1
* Ume
* 1
* b
* Geotail1

|

Active|

* Aqua1,7
* Arase
* ASNARO
* 1
* 2
* Daichi
* 2
* 4
* EarthCARE2
* GPM1
* Himawari
* Ibuki
* original
* 2
* Shikisai
* Shizuku

Future|

* GOSAT-GW
* PMM

Engineering tests

| Past|

* Ayame
* 1
* 2
* DASH
* EXPRESS
* IKAROS
* Jindai
* Kiku
* 1
* 2
* 3
* 4
* 5
* 6
* 7
* 8
* LDREX
* 1
* 2
* LRE
* Micro LabSat-1
* Myojo
* Ohsumi
* Orizuru
* RAISE
* 2
* 3†
* ~~PETSAT~~
* RAPIS-1
* Ryusei
* SERVIS-1
* SERVIS-2
* SDS-1
* SFU
* Shinsei
* ~~SmartSat-1~~
* Tansei
* 1
* 2
* 3
* 4
* Tasuki
* Tsubame
* Tsubasa
* USERS

|

Active|

* Ajisai
* Reimei
* SDS-4

Future|

* BEAK
* ETS-IX
* G-SATELLITE
* SERVIS-3

Human spaceflight

| Past|

* ~~Fuji crewed spacecraft~~
* ~~HOPE-X~~
* H-II Transfer Vehicle

|

Active|

* International Space Station (ISS) & Japanese Experiment Module (Kibō)1,2,3,4,5,6

Future|

* HTV-X
* Japanese Space Station Module (Mitsui)
* Lunar Gateway1,2,4

Space probes

| The Moon|

| Past|

* Hakuto-R Mission 1†
* Hiten
* ~~Lunar-A~~
* Kaguya (SELENE)
* OMOTENASHI†
* ~~SELENE-2~~
* Smart Lander for Investigating Moon (SLIM)
* Hakuto-R Mission 2†

|

Active|

* EQUULEUS

Future|

* HERACLES2,4
* Lunar Cruiser
* Lunar Polar Exploration Mission8 (LUPEX)
* Yaoki

Others|

| Past|

* Hayabusa
* ~~Hayabusa Mk2~~
* Nozomi†
* PROCYON†
* Sakigake
* Shin'en†
* Suisei

|

Active|

* Akatsuki
* BepiColombo (MMO/Mio)2
* Hayabusa2
* Jupiter Icy Moons Explorer2
* Hera2

Future|

* Comet Interceptor2
* DESTINY+
* Dragonfly1
* MELOS
* Martian Moons eXploration
* Next Generation Small-Body Sample Return
* TEREX

Reconnaissance satellites

| Past|

* IGS-Optical
* 1
* 2
* Experimentally 3
* IGS-Radar
* 1
* 2

|

Active|

* IGS-Optical
* 3
* 4
* 5
* 6
* Experimentally 5
* IGS-Radar
* 3
* 4
* Spare
* 5
* 6

Future|

* IGS-Optical
* 7
* 8
* IGS-Radar
* 7
* 8

Private small satellites

| Past|

* CosMoz
* CUTE
* 1.7+APD
* Fuji
* 1
* 2
* Hayato
* HIBARI
* HIT-SAT
* Kagayaki
* Kanta-kun (WEOS)
* Kūkai
* Maido-1
* Negai☆″
* Niwaka
* RAIKO
* Waseda-SAT2
* WE WISH

|

Active|

* CUTE
* 1
* 1.7+APDII
* Fuji-3
* Hitomi
* Hodoyoshi
* 1
* 2
* 3
* 4
* Horyu
* 2
* Kiseki
* PROITERES
* Raijin
* Raijin-2
* SEEDS
* SOCRATES
* XI
* IV
* V

Future|

* DRUMS
* KITSUNE
* OPUSAT-II
* QSAT-EOS
* RSP-01
* SOMESAT
* SpaceTuna1
* SPROUT
* TSUBAME
* WNI satellite

* v
* t
* e

← 2023

Orbital launches in 2024

2025 →

January|

* XPoSat
* Starlink G7-9 (21 satellites)
* Ovzon-3
* Starlink G6-35 (23 satellites)
* Tianmu-1 15-18
* Peregrine Mission One (Iris, Colmena × 5)
* Einstein Probe
* Tianxing-1-02
* Gravity-1 (Yunyao-1 18-20)
* IGS-Optical 8
* Starlink G7-10 (22 satellites)
* Starlink G6-37 (23 satellites)
* Tianzhou 7
* Axiom Mission 3
* Soraya
* Kinetica 1 (Taijing-1-03, Taijing-2-02, Taijing-2-04, Taijing-3-02, Taijing-4-03)
* Starlink G7-11 (22 satellites)
* Simorgh (Mahda, Keyhan-2, Hatef-1)
* Starlink G6-38 (23 satellites)
* Starlink G7-12 (22 satellites)
* Cygnus NG-20
* Lemur-2 / Skylark × 4

February|

* Geely Constellation Group 02 (11 satellites)
* Jielong 3 (DRO-L, NExSat 1, WeiHai-1-01/02, Xingshidai 18-20, Yantai-2, Zhixing 2A)
* PACE
* Kosmos 2575 / Razbeg №2
* Starlink G7-13 (22 satellites)
* SDA Tracking Layer Tranche 0 (4 satellites)
* Progress MS-26
* IM-1 (EagleCam)
* Starlink G7-14 (22 satellites)
* H3 (Vehicle Evaluation Payload-4, CE-SAT-1E, TIRSAT)
* INSAT-3DS
* ADRAS-J
* Merah Putih 2
* Starlink G7-15 (22 satellites)
* TJS-11
* Starlink G6-39 (24 satellites)
* Meteor-M No.2-4
* WHG-01
* Starlink G6-40 (23 satellites)

March|

* SpaceX Crew-8
* AEROS MH-1
* Starlink G6-41 (23 satellites)
* Starlink G6-43 (23 satellites)
* Starlink G7-17 (23 satellites)
* StriX-3
* KAIROS (CSICE Quick Response Satellite)†
* DRO-A, B
* Starship flight test 3
* Starlink G6-44 (23 satellites)
* Starlink G7-16 (20 satellites), USA-350 / Starshield, USA-351 / Starshield
* Queqiao-2, Tiandu-1, Tiandu-2
* Yunhai-2 02 (6 satellites)
* USA-352 / RASR-5
* SpaceX CRS-30
* Soyuz MS-25
* Starlink G6-42 (23 satellites)
* Starlink G6-46 (23 satellites)
* Yunhai-3 02
* Eutelsat 36D
* Starlink G6-45 (23 satellites)
* Resurs-P №4

April|

* Starlink G7-18 (22 satellites)
* Yaogan 42-01
* Starlink G6-47 (23 satellites)
* Starlink G8-1 (21 satellites)
* Acadia-4, Hawk × 6, TSAT-1A
* USA-353 / Orion 12
* Starlink G6-48 (23 satellites)
* Angara A5 (Orion)
* WSF-M 1
* Starlink G6-49 (23 satellites)
* Starlink G6-51 (23 satellites)
* Starlink G6-52 (23 satellites)
* Yaogan 42-02
* Starlink G6-53 (23 satellites)
* Shenzhou 18
* Galileo FOC FM25, Galileo FOC FM26
* Starlink G6-54 (23 satellites)

May|

* WorldView Legion 1, WorldView Legion 2
* Starlink G6-55 (23 satellites)
* Chang'e 6, ICUBE-Q
* Starlink G6-57 (23 satellites)
* Long March 6C (Haiwangxing-01, Zhixing-1C)
* Starlink G6-56 (23 satellites)
* Zhihui Tianwang 1-01A & 1-01B
* Starlink G8-2 (20 satellites)
* Shiyan 23
* Starlink G6-58 (23 satellites)
* Starlink G8-7 (20 satellites)
* Kosmos 2576 / Nivelir-L N°4
* Starlink G6-59 (23 satellites)
* Beijing-3C (4 satellites)
* Kuaizhou 11 (Chaodigui Jishu Shiyan, Lingque-3 01, Luojia 3-01, Tianyan 22)
* USA-354,...,USA-374 / Starshield × 21
* Starlink G6-62 (23 satellites)
* Starlink G6-63 (23 satellites)
* PREFIRE Mission 1
* Malligyong-1 #1†
* Starlink G6-60 (23 satellites)
* EarthCARE
* Ceres-1S (Tianqi 25-28)
* Progress MS-27
* Paksat-MM1R
* Ceres-1 (Jiguang 01 & 02, Yunyao-1 14, Yunyao-1 25-26)

June|

* Starlink G6-64 (23 satellites)
* Starlink G8-5 (20 satellites)
* PREFIRE Mission 2
* Boe-CFT
* Ceres-1 (Naxing-3A & 3B, TEE-01B)
* Starship flight test 4
* Starlink G10-1 (22 satellites)
* Starlink G8-8 (20 satellites)
* Starlink G9-1 (20 satellites)
* Kinéis 1 A-E
* ASTRA 1P / SES-24
* SVOM
* Starlink G10-2 (22 satellites)
* Starlink G9-2 (20 satellites)
* GOES-U
* Starlink G10-3 (23 satellites)
* USA-375,...,USA-395 / Starshield × 21
* ChinaSat 3A

July|

* ALOS-4
* Starlink G8-9 (20 satellites)
* Alpha (CatSat, KUbeSat-1, MESAT 1, R5-S2-2.0, R5-S4, Serenity, SOC-i, TechEdSat-11)
* Tianhui 5 Group 02 (2 satellites)
* Türksat 6A
* Ariane 6 (Nyx Bikini, ISTSat-1)
* Ceres-1 (Yunyao-1 15-17)†
* Starlink G9-3 (23 satellites)†
* Gaofen 11-05
* Starlink G10-9 (23 satellites)
* Starlink G10-4 (23 satellites)
* Starlink G9-4 (21 satellites)
* USA-396, USA-397, USA-398

August|

* WHG-02
* Starlink G10-6 (23 satellites)
* StriX-4
* Starlink G11-1 (23 satellites)
* Cygnus NG-21 (Wisseed Sat)
* Qianfan Polar Group 01 (18 satellites)
* Starlink G8-3 (21 satellites)
* Acadia-3
* ASBM-1, ASBM-2
* Starlink G10-7 (23 satellites)
* Progress MS-28
* WorldView Legion 3, WorldView Legion 4
* EOS-08
* Yaogan 43-01 (9 satellites)
* ION SCV-012, Acadia-5, EagleEye, Hawk × 3, ICEYE × 4, ÑuSat × 3, Flock-4be × 36, HYPSO-2, Lemur-2 × 7, Lemu Nge, Nightjar, Phi-Sat-2, PTD-4, PTD-R, TORO
* Starlink G10-5 (22 satellites)
* ChinaSat 4A
* Starlink G8-6 (21 satellites)
* Ceres-1S (Jitianxing A-03, Suxing 1-01, Tianfu Gaofen 2, Yunyao-1 15-17)
* Starlink G8-10 (21 satellites)
* Starlink G9-5 (21 satellites)

September|

* Yaogan 43-02 (6 satellites)
* Sentinel-2C
* Starlink G8-11 (21 satellites)
* Geely Constellation Group 03 (10 satellites)
* USA-400,...,USA-420 / Starshield × 21
* Polaris Dawn
* Soyuz MS-26
* BlueBird Block 1 (5 satellites)
* Starlink G9-6 (21 satellites)
* Qaem 100 (Chamran-1)
* Kosmos 2577 / OO MKA №1, Kosmos 2578 / OO MKA №2
* Galileo FOC FM26, Galileo FOC FM32
* BeiDou-3 M27, BeiDou-3 M28
* Jilin-1 Kuanfu-02B (6 satellites)
* Kuaizhou-1A (Tianqi 29-32)
* Starlink G9-17 (20 satellites)
* Kinéis 3 A-E
* Tianyan-15
* Jilin-1 SAR-01A
* Starlink G9-8 (20 satellites)
* IGS-Radar 8
* Shijian 19
* SpaceX Crew-9

October|

* Vulcan Cert-2
* Hera, Juventas, Milani
* WHG-03
* Starship flight test 5
* Europa Clipper
* Starlink G10-10 (23 satellites)
* Starlink G9-7 (20 satellites)
* Qianfan Polar Group 02 (18 satellites)
* Gaofen 12-05
* Starlink G8-19 (20 satellites)
* OneWeb L20 (20 satellites)
* Tianping-3A01, Tianping-3B01, Tianping-3B02
* Yaogan 43-03 (3 satellites)
* Starlink G6-61 (23 satellites)
* USA-421,...,USA-437 / Starshield × 17
* Starlink G10-8 (22 satellites)
* Shenzhou 19
* Starlink G9-9 (20 satellites)
* Starlink G10-13 (23 satellites)
* Kosmos 2579 / Bars-M 6L

November|

* DSN-3
* Ionosfera-M n°1 & n°2
* SpaceX CRS-31 (LignoSat)
* Protosat-1
* Starlink G6-77 (23 satellites)
* PIESAT-2A 01, PIESAT-2B 01–03
* Starlink G9-10 (20 satellites)
* Shiyan 26A, Shiyan 26B, Shiyan 26C, Jilin-1 Gaofen-05B-01, Jilin-1 Pingtai-02A-03, Tianyan-24
* Koreasat 6A
* Starlink G6-69 (24 satellites)
* Haiyang-4A
* Starlink G9-11 (20 satellites)
* Starlink G6-68 (24 satellites)
* Tianzhou 8
* Optus-X
* Starlink G9-12 (20 satellites)
* GSAT-20
* Starship flight test 6
* Progress MS-29
* Starlink G6-66 (24 satellites)
* Starlink G9-13 (20 satellites)
* Siwei Gaojing 2-03, Siwei Gaojing 2-04
* Kinéis 5 A-E
* Starlink G12-1 (23 satellites)
* Guangchuan-01, Guangchuan-02
* Starlink G6-76 (24 satellites)
* Kondor-FKA №2
* Starlink G6-65 (24 satellites)
* Starlink GN-01 (20 satellites), USA-438 / Starshield, USA-439 / Starshield
* Long March 12 (JSW-03)

December|

* TJS-13
* Haishao-1
* Starlink G6-70 (24 satellites)
* Kosmos 2580 / Lotos-S1 n°09
* Starlink G9-14 (20 satellites)
* Qianfan Polar Group 03 (18 satellites)
* PROBA-3
* SXM-9
* Sentinel-1C
* Saman-1
* Starlink G12-5 (23 satellites)
* High Speed Laser Diamond Constellation Test System (5 satellites)
* Starlink G11-2 (22 satellites)
* SatNet LEO Group 01 (10 satellites)
* PIESAT-2 09-12
* USA-440
* USA-441,...,USA-462 Starshield × 22
* O3b mPOWER 7 & 8
* Kairos (ISHIKI, TATARA-1, SC-Sat1)†
* Ceres-1S (Tianqi 33-36)
* TJS-12
* LASARsat
* StriX-2
* Starlink G12-2 (21 satellites)
* Resurs-P n°05
* Kinetica 1 (DEAR-3)†
* Starlink G11-3 (22 satellites)
* Astranis Block 2 (4 satellites)
* SpaDeX
* Starlink G12-6 (21 satellites)

Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ).
Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).
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