| Names | Daichi 3 |
|---|---|
| Mission type | Remote sensing |
| Operator | JAXA |
| Website | www |
| 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 | TanegashimaLP2 |
| 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] | |
Advanced Land Observing Satellite 3 (ALOS-3), also calledDaichi 3, was a 3-ton Japanesesatellite 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 theALOS satellite, which operated from 2006 to 2011. TheALOS-2 satellite and theALOS-4 satellite carrysynthetic-aperture radar.
The satellite was launched as the payload on the first launch of theH3 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.[3]
![[icon]](/mt/?noimg=&dark=on&url=http%3a%2f%2fen.wikipedia.org%2fwiki%2fFile%3aWiki_letter_w_cropped.svg) | This sectionneeds expansion. You can help byadding to it.(March 2023) |
ALOS-3 launched fromTanegashima, Japan by aH3 rocket on 7 March 2023.[1] Initially the launch was scheduled for 17 February but was aborted seconds before liftoff.[4]
| 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 anEarth 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, whilered edge was to be used to monitor vegetation growth.[5]
Source:[6]
This was the defaultobservation mode of ALOS-3. It observed in an area which was 70 km in width and 4,000 km in length in the direction of the orbital path(path of theorbit).
This mode acquiredstereo-pair image of a certain point from two different directions(it acquired athree dimensional picture of some point onearth).
This mode would have been capable of observing any given point in Japan within 24 hours after receiving the request to use the 'point observation mode' using pointing function of thesatellite to point up to 60degrees in all directions against the satellitenadir.
This mode was capable of observing a wide-area of over 200km by 100km with the help of multiple scan observations(observations) during an orbital path of the satellite.
Continuously observe an area, even if it is not along the trajectory, by controlling the attitude(attitude refers to the orientation of the satellite in space, or how it's pointing, relative to a reference frame like the Earth or the Sun. It's essentially describing the satellite's "direction" or "pointing angle") of the satellite and changing the direction of observation(the direction where the satellite is observing).
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