Diwata-2

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Diwata-2
Diwata-2.png
Mission type Communications / Earth Observation
Spacecraft properties
Manufacturer DOST
University of the Philippines
Hokkaido University
Tohoku University
BOL mass 56 kg (123 lb)
Start of mission
Launch date 04:51, October 29, 2018 (UTC) (2018-10-29T04:51Z)
Rocket H-IIA
Launch site Tanegashima LA-Y
Contractor Mitsubishi Heavy Industries
Orbital parameters
Reference system Sun-synchronous orbit
Regime Low Earth
Instruments
High Precision Telescope (HPT)
Space-borne Multispectral Imager (SMI)
(with Liquid Crystal Tunable Filter (LCTF))
Enhanced Resolution Cameras
Amateur Radio
← Maya-1

Diwata-2 or Diwata-2B[1] is a Philippine microsatellite launched in October 29, 2018.[2][3][4][5] It is the second satellite of the Philippine Scientific Earth Observation Microsatellite (PHL-Microsat) program after Diwata-1.

Development

The satellite was developed by 11 scholars under the Philippine Department of Science and Technology (DOST), in cooperation with the Tohoku University and Hokkaido University in contrast to 9 DOST scholars who worked with Diwata-1, Diwata-2's predecessor.[6]

Unlike its predecessor, Diwata-2 takes advantage of radio communication technology by carrying an amateur radio payload for disaster relief purposes.[6] The satellite also hosts all embedded features of its predecessor.[7]

The planning phase of the Diwata-2's development includes a simulation model, a mechanical test model, an engineering model and a flight model. This stage ended with the flight model which was completed on August 29, 2018 and was handed over to the Japan Aerospace Exploration Agency (JAXA) on the following day.[8]

Instruments

Weighing 56 kg (123 lb)[1], Diwata-2 will host an amateur radio payload which will enable people in the Philippines to relay messages through ham radio to any part of the country. This function is meant for disaster relief operations. The satellite will also carry Spaceborne Multispectral Imager (SMI) with liquid crystal tunable filter (LCTF) for environmental monitoring, and a high precision telescope (HPT) for rapid post-disaster assessment. Compared to Diwata-1 which hosted wide and middle field cameras, Diwata-2 will host enhanced resolution cameras.[6] The SMI, is equipped with an upgraded enhanced spatial resolution camera allowing the satellite to produced sharper images than the Diwata-1. It will also have a deployable solar panels to power the satellite's payloads.[9]

Launch and mission

The satellite was targeted by the DOST to be deployed as early as the second quarter of 2018.[10] The projected launch date was later adjusted at least twice; June 2018[11] and later pushed forward to fourth quarter of 2018.[12]

It was announced that on October 26, 2018 the satellite would be launched to space via the H-IIA from Japan[13] at the Tanegashima Space Center at around 13:08 and 13:20 (JST).[9] Unlike Diwata-1, Diwata-2 will be directly deployed from the rocket that will carry it from space and not from the International Space Station like its predecessor.[11][13] The satellite, which will piggyback on the bigger Japanese satellite Gosat-2 will be propelled to an elevation of 620 km (390 mi) above sea level.[9]

On October 29, 2018, the satellite was launched directly into orbit at 13:51 (UTC+9).[14] Communication between the satellite and the DOST-ASTI's ground station in Quezon City was first established on October 29 at 21:52 (UTC+8).[15]

Diwata-2 will have the same mission as its predecessor, Diwata-1. It will have a sun-synchronous orbit[10] having been equip with an experimental sun sensor which would allow the operators to determine the position of the satellite in respective to the sun and it will orbit at an altitude of 620 km (390 mi) above sea level. It will also have a fixed visit interval time unlike its predecessor, meaning it will hover above the same position on Earth for every 16 days. The satellite has a projected life expectancy of five years.[9]

See also

References

  1. ^ a b "Live coverage: Japan's H-2A rocket poised for 40th flight". SpaceFlight Now. 28 October 2018. Retrieved 29 October 2018.
  2. ^ "Diwata-2 microsatellite scheduled for October 29 launch". FlipScience. 2018-10-28. Retrieved 2018-10-29.
  3. ^ Cabalza, Dexter. "PH successfully sends Diwata-2 microsatellite into space". Retrieved 2018-10-29.
  4. ^ "PH-made microsatellite Diwata-2 flies into space". Rappler. Retrieved 2018-10-29.
  5. ^ "DOST TO LAUNCH DIWATA-2 MICRO SATELLITE ON OCT. 29". League Online News. Retrieved 2018-11-06.
  6. ^ a b c Mondonedo-Ynot, Laureen (18 January 2017). "Diwata 2's payload includes amateur radio". Sun Star Manila. Retrieved 25 January 2017.
  7. ^ Sambalud, Mark (7 December 2016). "Change is coming (1/2): How space technology is changing disaster risk management in PHL". Davao Today. Retrieved 25 January 2017.
  8. ^ "Diwata-2 microsatellite launching on Oct. 29". BusinessMirror. 28 October 2018. Retrieved 28 October 2018.
  9. ^ a b c d Tumampos, Stephanie; Resurreccion, Lyn (29 October 2018). "PHL flying high–into space". BusinessMirror. Retrieved 29 October 2018.
  10. ^ a b Usman, Edd (5 June 2017). "How Diwata-2 is better than PH's first satellite, Diwata-1". Rappler. Retrieved 6 June 2017.
  11. ^ a b Yee, Jovic (19 February 2018). "Pinoy students fail to reach astronauts at space station". Philippine Daily Inquirer. Retrieved 2 June 2018.
  12. ^ Reyes, Rizal Raoul (23 September 2018). "Russia's elite space program opens doors to Filipino scholar". Retrieved 15 October 2018. Diwata 2 is expected to be launched in the last quarter of this year.
  13. ^ a b "DOST to launch microsatellite to gather data on disasters". PTV News. 27 October 2018. Retrieved 27 October 2018.
  14. ^ Panela, Shaira (29 October 2018). "PH-made microsatellite Diwata-2 flies into space". Rappler. Retrieved 29 October 2018.
  15. ^ Resurreccion, Lyn (1 November 2018). "Diwata-2 makes first contact with receiving station in PHL". BusinessMirror. Retrieved 2 November 2018.
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