Notice for Operation Conclusion of DESPATCH
Dear All,
Happy New Year 2015!
One month has past since Deep Space Sculpture "ARTSAT2:DESPATCH(FO-81)" was put into an Earth-escape orbit as a piggyback payload of H-IIA F26 launched at December 3, 2014 from Tanegashima Space Center, JAXA. It is estimated to have stopped sending radio waves since the battery of DESPATCH already ran out (We predicted that the battery will work for 27 days according to the running time of the transmitter).
Today January 3, the main control station, Tama Art University Ground Station, decided to conclude the operation of DESPATCH. Many people supported and cooperated us throughout the design and development of DESPATCH. In addition, many excellent many ham radio operator received and reported super weak radio waves of DESPATCH from deep space. To have this opportunity, I would like once again to thank all of them very much.
Reception reports of DESPATCH are summarized on the following page.
Reception Reports https://docs.google.com/spreadsheets/d/1WP-FzXHe8axAzNy44SGbKpJqIRKWHAcIP9vX...
Finally, we had two reception reports at 4.7 million kilo-meters from the Earth (more than 12 times of the distance to the Moon). They were far beyond what we expected. They are the the longest communication distance in the world between two amateur radio stations.
Orbital elements of DESPATCH is as follows (J2000 heliocentric ecliptic coordinates).
- Semi-major axis a : 1.003881127 [AU] - Eccentricity e : 0.08741828512 - Inclination i : 6.796995362 [deg] - Argument of perihelion w : 96.90057903 [deg] - Longitude of the ascending node W : 250.5520871 [deg] - Mean anomaly at epoch M : 101.6280436 [deg] - Epoch : 2457023.50000 [JD] (Time of perihelion : 2456919.7870655278675 [JD])
cf. Orbital elements of EARTH : http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html
Celestial sphere position and orbital trajectory of DESPATCH can be checked anytime on the following web pages.
- Celestial Sphere http://artsat.jp/project/despatch/celestial
- Orbital Position http://artsat.jp/project/despatch/orbit
Transmission of the radio wave from DESPATCH has ended. However, the life of DESPATCH as a sculpture around the sun is almost eternal. We calculated the orbit (the distance from the Earth) of DESPATCH for 500 years from now.
http://artsat.jp/wp-content/uploads/2015/01/500years.png
http://artsat.jp/wp-content/uploads/2015/01/500years_large.png
DESPATCH will continue to orbit around the sun as an artificial asteroid. By examining the calculated results for the local minimum value of the distance between the Earth, DESPATCH will approaches to less than 1 million km from Earth after about 350 years. Possibly it will approach more closer to the Earth due to the interaction with unpredictable other celestial bodies.
We are glad if you think of DESPATCH as the most distant artwork in the world sometimes in the future.
ARTSAT project will continue to the future. We already started the conceptual design of next ARTSAT3. We kindly ask for your continuous support and cooperation for the project.
January 3, 2014 ARTSAT Project
Hearty Congratulations to the entire ARTSAT Project team and to those amateur radio stations for the support!!
Indeed, it is a very major step in the world of amateur radio space communication capabilities and truly a great achievement.
Compliments to those two amateur radio stations in receiving the telemetry signals from 4.7 million Kms thereby making a record of longest communication distance in the world between two amateur radio stations.
May 2015 and the years to come make amateur radio in Space more fun, challenging and meaningful.
73 de Namasthe from India.
Quoting Akihiro Kubota akihiro.kubota@nifty.com:
Dear All,
Happy New Year 2015!
One month has past since Deep Space Sculpture "ARTSAT2:DESPATCH(FO-81)" was put into an Earth-escape orbit as a piggyback payload of H-IIA F26 launched at December 3, 2014 from Tanegashima Space Center, JAXA. It is estimated to have stopped sending radio waves since the battery of DESPATCH already ran out (We predicted that the battery will work for 27 days according to the running time of the transmitter).
Today January 3, the main control station, Tama Art University Ground Station, decided to conclude the operation of DESPATCH. Many people supported and cooperated us throughout the design and development of DESPATCH. In addition, many excellent many ham radio operator received and reported super weak radio waves of DESPATCH from deep space. To have this opportunity, I would like once again to thank all of them very much.
Reception reports of DESPATCH are summarized on the following page.
Reception Reports
https://docs.google.com/spreadsheets/d/1WP-FzXHe8axAzNy44SGbKpJqIRKWHAcIP9vX...
Finally, we had two reception reports at 4.7 million kilo-meters from the Earth (more than 12 times of the distance to the Moon). They were far beyond what we expected. They are the the longest communication distance in the world between two amateur radio stations.
Orbital elements of DESPATCH is as follows (J2000 heliocentric ecliptic coordinates).
- Semi-major axis a : 1.003881127 [AU]
- Eccentricity e : 0.08741828512
- Inclination i : 6.796995362 [deg]
- Argument of perihelion w : 96.90057903 [deg]
- Longitude of the ascending node W : 250.5520871 [deg]
- Mean anomaly at epoch M : 101.6280436 [deg]
- Epoch : 2457023.50000 [JD]
(Time of perihelion : 2456919.7870655278675 [JD])
cf. Orbital elements of EARTH : http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html
Celestial sphere position and orbital trajectory of DESPATCH can be checked anytime on the following web pages.
- Celestial Sphere
http://artsat.jp/project/despatch/celestial
- Orbital Position
http://artsat.jp/project/despatch/orbit
Transmission of the radio wave from DESPATCH has ended. However, the life of DESPATCH as a sculpture around the sun is almost eternal. We calculated the orbit (the distance from the Earth) of DESPATCH for 500 years from now.
http://artsat.jp/wp-content/uploads/2015/01/500years.png
http://artsat.jp/wp-content/uploads/2015/01/500years_large.png
DESPATCH will continue to orbit around the sun as an artificial asteroid. By examining the calculated results for the local minimum value of the distance between the Earth, DESPATCH will approaches to less than 1 million km from Earth after about 350 years. Possibly it will approach more closer to the Earth due to the interaction with unpredictable other celestial bodies.
We are glad if you think of DESPATCH as the most distant artwork in the world sometimes in the future.
ARTSAT project will continue to the future. We already started the conceptual design of next ARTSAT3. We kindly ask for your continuous support and cooperation for the project.
January 3, 2014 ARTSAT Project
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Mani [VU2WMY/KJ6LRS] Secretary & Station-In-Charge Upagrah Amateur Radio Club VU2URC ISRO Satellite Centre HAL Airport Road, Bangalore-560 017. Phone:(Office)91-80-25082598/25082054/25082192 Mobile: 91-9880 341 456 E-mail ID: wmy@isac.gov.in vu2wmy_mani@yahoo.com isrohams@yahoo.com ------------------------------------------------------------------------------ Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. ------------------------------------------------------------------------------
Dear all,
I heard many stations sent report about DESPATCH all over the world, nad the project members espacially appreciate the EME'ers reported the data fr om the deep space.
As Prof. Kubota annouced, DESPATCH operation was concluded.
But the "Artwork", the satellite iteself, is still on the orbit around the sun . The project members provide the position information of DESPATCH for eternal, as well as the API data.
I revised my "DESPATCHtrack", the utility to obtain the position of DESPATCH, to be used eternally, too.
You can get the new version from: http://ji1izr.air-nifty.com/ham_satellite/2015/01/artsat2-despa-1.html
I hope it will help you when you think over DESPATCH.
Thank you for your cooperation.
Sincerely, ji1izr/Masahiro
********************************** Masahiro Sanada de ji1izr Hiratsuka-city Kanagawa,Japan ji1izr_1975@nifty.com ji1izr@jarl.com ji1izr@jamsat.or.jp web: http://ji1izr.atnifty.com/ blog: http://ji1izr.air-nifty.com/ **********************************
participants (3)
-
Akihiro Kubota -
ji1izr/Masahiro Sanada -
Mani [VU2WMY/KJ6LRS]