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{{Infobox spaceflight
| name = Space Docking Experiment
| image =
| image_caption =
| image_size =
| mission_type =
| operator = [[Indian Space Research Organisation|ISRO]]
| spacecraft_bus = [[Indian Mini Satellite bus|IMS]]-2
| manufacturer = [[Indian Space Research Organisation|ISRO]]
| launch_date = 2021 (planned)
| launch_rocket = [[Polar Satellite Launch Vehicle|PSLV]]
| launch_site = [[Satish Dhawan Space Centre]]
| launch_contractor = [[Indian Space Research Organisation|ISRO]]
}}
'''SPADEX''' or Space Docking Experiment is a twin spacecraft mission being developed by [[Indian Space Research Organisation]] to mature technologies related to orbital [[Space rendezvous|rendezvous]], [[Spacecraft Docking and Berthing Mechanisms|docking]], [[formation flying]] and remote [[robotic arm]] operations, with scope of applications in human spaceflight, in-space satellite servicing and other proximity operations.<ref name=":0">{{Cite web|url=https://www.isro.gov.in/sites/default/files/annualreport2018-19.pdf|title=Department of Space Annual Report 2018-19|last=|first=|date=27 May 2019|website=|url-status=live|archive-url=https://web.archive.org/web/20190527183016/https://www.isro.gov.in/sites/default/files/annualreport2018-19.pdf|archive-date=27 May 2019|access-date=2 October 2019}}</ref>

SPADEX campaign would consist of two [[Indian Mini Satellite bus|IMS-2 class]] (400 kg) satellites, one would be Chaser and other being Target and both would be launched as co-passengers or auxiliary payloads.<ref>{{Cite web|url=http://isro.org/pdf/Outcome%20budget2013-14.pdf|title=Department of Space Outcome Budget 2013-14|last=|first=|date=|website=|url-status=dead|archive-url=https://web.archive.org/web/20130818023003/http://isro.org/pdf/Outcome%20budget2013-14.pdf|archive-date=18 August 2013|access-date=}}</ref> Both spacecraft would be injected into slightly different orbits.<ref>{{Cite journal|last=Chacko|first=T.|last2=B P|first2=Dakshayani|last3=Vighnesam|first3=N.|last4=Gopinath|first4=N.S.|date=2012-01-01|title=Relative state vector generation algorithm for on board navigation for rendezvous docking experiment|url=https://www.researchgate.net/publication/290556133|volume=7|pages=5313–5316}}</ref>

Space Docking Experiment is currently scheduled for launch from [[Satish Dhawan Space Centre]] aboard a [[Polar Satellite Launch Vehicle|Polar Satellite launch Vehicle]].<ref>{{Cite web|url=https://www.thehindubusinessline.com/news/science/isro-to-demonstrate-docking-of-satellites-next-year-says-sivan/article29558585.ece|title=ISRO's space docking experiment to happen next year, says Sivan|last=Ramesh|first=M.|website=@businessline|language=en|access-date=2019-10-02}}</ref><ref>{{Cite web|url=https://thewire.in/science/space-science-aditya-isro-xposat-nisar|title=5 Unique Space Science Missions That ISRO Will Be Flying in the Near Future|website=The Wire|access-date=2019-10-02}}</ref><ref>{{Cite web|url=https://timesofindia.indiatimes.com/india/isro-to-hold-space-docking-experiment-next-year-a-step-towards-setting-up-space-station/articleshow/71415073.cms|title=Isro to hold space-docking experiment next year, a step towards setting up space station {{!}} India News - Times of India|last=Oct 3|first=Surendra Singh {{!}} TNN {{!}} Updated|last2=2019|website=The Times of India|language=en|access-date=2019-10-03|last3=Ist|first3=2:21}}</ref>

== Objectives ==

* Autonomous rendezvous and docking
* Controlling one spacecraft with Attitude Control System of other spacecraft while in docked configuration.<ref name=":0" />
* Formation flying
* Remote robotic arm operations{{Citation needed|date=October 2019}}

== Status ==

With preliminary studies done in 2016,<ref>{{Cite web|url=https://timesofindia.indiatimes.com/india/isro-project-that-can-aid-refuel-repair-of-satellites-in-space-gets-push/articleshow/58467493.cms|title=ISRO: Isro project that can aid refuel, repair of satellites in space gets push {{!}} India News - Times of India|last=May 2|first=Chethan Kumar {{!}} TNN {{!}} Updated|last2=2017|website=The Times of India|language=en|access-date=2019-10-02|last3=Ist|first3=12:01}}</ref> Space Docking Experiment was approved by Government of India with initial funding of ₹10 crore cleared in 2017.<ref>{{Cite web|url=https://www.isro.gov.in/sites/default/files/article-files/right-to-information/ddg_2018_-2019_-_final.pdf|title=Detailed Demands for Grants of Department of Space for 2018-2019|last=|first=|date=|website=|url-status=dead|archive-url=https://web.archive.org/web/20181122113804/https://www.isro.gov.in/sites/default/files/article-files/right-to-information/ddg_2018_-2019_-_final.pdf|archive-date=22 November 2018|access-date=}}</ref> In June 2019, ISRO was looking for proposals to study remote robotic arm operation, rendezvous and docking related technologies on its PSLV fourth stage (PS4) orbital platform.<ref>{{Cite web|url=https://www.isro.gov.in/sites/default/files/orbital_platform-_ao.pdf|title=Announcement of Opportunity (AO) for Orbital platform: An avenue for in-orbit scientific experiments|last=|first=|date=15 June 2019|website=|url-status=live|archive-url=https://web.archive.org/web/20191002124444/https://www.isro.gov.in/sites/default/files/orbital_platform-_ao.pdf|archive-date=2 October 2019|access-date=2 October 2019}}</ref>

== See also ==

* [[ETS-VII]] or KIKU-7, also known as Orihime/Hikoboshi
* [[Kosmos 186 and Kosmos 188]]
* [[Orbital Express]]
* [[Robotic Refueling Mission]]

== References ==
{{reflist}}

[[Category:Proposed spacecraft]]
[[Category:2021 in spaceflight]]
[[Category:Robotic satellite repair vehicles]]

SPADEX - Revision history

UpdateBot: robot: Update article (please report if you notice any mistake or error in this edit)

2601:640:847F:32D0:5902:5785:BF56:9FFD at 03:48, 28 May 2021