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{{Infobox rocket launch
| name = PSLV-C45
| image = PSLV C45 EMISAT campaign 23.jpg
| alt = A PSLV-CA launch vehicle begins to lift off from its pad
| caption = Ignition of the PSLV-QL launch vehicle at the start of flight C45
| rocket = PSLV-QL
| launch = {{Start date|2019|04|01|df=yes}}, 03:57:00 UTC
| operator = [[Defence Research and Development Organisation|DRDO]]
| pad = [[Satish Dhawan Space Centre|Sriharikota]] [[Satish Dhawan Space Centre Second Launch Pad|Second]]
| payload = {{Collapsible list|title=29 satellites|titlestyle=font-weight:normal;background:transparent;text-align:left|{{Hlist|Aistechsat-3|Astrocast-2|BlueWalker1|Doves × 20 ([[Planet Labs#Flock|Flock 4a]])|[[EMISAT]] |Lemur-2 × 4|M6P}}}}
| outcome = Success
| succession = [[List of PSLV launches|PSLV launches]]
| previous = [[PSLV-C44]]
| next = [[PSLV-C46]]
}}

The '''PSLV-C45<ref name="skyrocket.de">{{cite web|url=https://space.skyrocket.de/doc_lau/pslv.htm|title=PSLV|website=Space.skyrocket.de|accessdate=25 February 2019}}</ref>''' is the 47th mission of the Indian [[Polar Satellite Launch Vehicle]] (PSLV) program. The Polar Satellite Launch Vehicle (PSLV)-C45 was launched on 1 April 2019 with a payload of 29 satellites, including one for electronic intelligence, along with 28 customer satellites from other countries.

==Details==
The PSLV-C45 was launched from the [[Satish Dhawan Space Centre Second Launch Pad|second launch pad]] of the [[Satish Dhawan Space Centre]] in Sriharikota, Andhra pradesh,India. The PSLV C45 rocket carried primary payloads like [[EMISAT]] and secondary payloads like M6P, [[AST SpaceMobile|BlueWalker 1]], four Lemur-2 out of a total of thirty satellites.<ref name=":0">{{Cite web|url=https://www.isro.gov.in/sites/default/files/pslv-c45_launch_kitv5.0_fn_23.03.19.pdf|title=PSLV C45 Press kit|date=23 March 2019|archive-url=https://web.archive.org/web/20190323093804/https://www.isro.gov.in/sites/default/files/pslv-c45_launch_kitv5.0_fn_23.03.19.pdf|archive-date=23 March 2019|access-date=26 March 2019}}</ref>
EMISAT<ref>{{cite web|url=https://space.skyrocket.de/doc_sdat/emisat.htm|title=EMISAT|website=Space.skyrocket.de|accessdate=25 February 2019}}</ref> is developed by [[DRDO]].<ref>{{Cite web|url=https://timesofindia.indiatimes.com/india/first-in-indias-space-history-isros-pslv-c45-to-release-payloads-in-3-orbits/articleshow/68143586.cms|title=First in India's space history, Isro’s PSLV-C45 to release payloads in 3 orbits - Times of India|website=The Times of India|access-date=2019-03-26}}</ref> The EMISAT satellite is based on the [[Indian Mini Satellite bus|IMS-2]] bus inherited from [[SARAL]]. The nature of the payload has not been officially confirmed.

It was the first flight of PSLV-QL,<ref name="skyrocket.de"/> having 4 strap-on boosters and placed a primary payload [[EMISAT]] and a secondary payload of multiple cubesats, for example 4 [[Lemur-2]] satellites and the [[NanoAvionics|M6P]] satellite, in [[sun-synchronous orbit]]s.

== Uniqueness of the project ==
[[File:PSLV C-45 captured from launch view gallery.jpg|thumb|390x390px|PSLV C45 as seen from launch view gallery]]
The specialty of this mission is that for the first time PSLV will launch satellites in Three different orbits.<ref>{{cite news|url=https://www.business-standard.com/article/news-ani/india-to-launch-first-3-orbit-mission-with-pslv-c45-on-march-21-119022400033_1.html|title=India to launch first 3 orbit mission with PSLV-C45 on March 21|date=24 February 2019|accessdate=25 February 2019|newspaper=[[Business Standard]]}}</ref><ref>{{cite web|url=https://www.indiatimes.com/trending/india-all-set-to-launch-its-first-mission-that-will-put-30-satellites-in-3-different-orbits-362695.html|title=India All Set To Launch Its First Mission That Will Put 30 Satellites In 3 Different Orbits|date=24 February 2019|website=Indiatimes.com|accessdate=25 February 2019}}</ref><ref>{{cite web|url=https://economictimes.indiatimes.com/news/science/isro-will-launch-first-3-orbit-mission-with-pslv-c45-on-march-21-k-sivan/videoshow/68134870.cms|title=ISRO will launch first 3 orbit mission with PSLV-C45 on March 21|author=Economictimes|accessdate=25 February 2019|website=Economictimes.indiatimes.com}}</ref> Another distinguished feature of the project is for the first time, PSLV with four strap-on<ref name=":0" /> configuration has been identified for this mission. Until now, PSLV has been in either two or six strap-on configuration or without any strap-ons. Third uniqueness in this mission as it is the first PSLV fourth stage (PS4) that uses solar panels to support payloads hosted on it.<ref>{{cite web|url=https://timesofindia.indiatimes.com/india/isro-set-for-first-three-orbit-mission-of-pslv-c45-on-march-14/articleshow/68016364.cms|title=ISRO set for first three-orbit mission of PSLV-C45 on March|date=15 February 2019|accessdate=25 February 2019|newspaper=[[The Times of India]]}}</ref>

==Sequence of launch==
Mission starts with the Launching of the satellite EMISAT into orbit at 780 km, then it will inject 29 satellites into orbit at 504 km and later the fourth stage will move to 485 km orbit to carry out scientific experiments.

The launch was originally scheduled for 21 March 2019, but was delayed to 1 April "to ensure system readiness for a perfect launch".<ref>{{cite web |title=Isro set for next PSLV-C45 launch on April 1 - Times of India |url=https://timesofindia.indiatimes.com/india/isro-set-for-next-pslv-c45-launch-on-april-1/articleshow/68432652.cms |website=The Times of India |accessdate=15 March 2019}}</ref>

==Mission overview==
* '''Propellant''':
**''Stage 1:'' [[Solid-fuel rocket|composite solid]]
** ''Stage 2:'' [[Liquid fuel rocket|Earth storable liquid]]
** ''Stage 3:'' [[Solid-fuel rocket|composite solid]]
** ''Stage 4:'' [[Liquid fuel rocket|Earth storable liquid]]
* '''Altitude''': {{convert|780|km|mi|0}}

<ref name=":0" />


The PSLV C45 rocket had four stages; each one was self-contained, with its own [[Spacecraft propulsion|propulsion system]], thereby capable of functioning independently.<ref name=":0" /> The first and third stages used composite solid propellants, while the second stage used earth-storable liquid propellant and fourth one fitted with Solar Panels.<ref name=":0" />

==References==
{{reflist|33em}}

==External links==
{{Portal|Spaceflight}}
{{commons category|PSLV-C45}}
*[https://www.isro.gov.in/hi/launcher/pslv-c45 PSLV-C45 / EMISAT Mission]

{{PSLV}}

[[Category:Polar Satellite Launch Vehicle]]
[[Category:Spacecraft launched by India in 2019]]
[[Category:April 2019 events in India]]
[[Category:Rocket launches in 2019]]

PSLV-C45 - Revision history

Ajay Kumar: Created a new article