ISRO Achieves An­other Mile­stone

PSLV-C35 SUC­CESS­FULLY LAUNCHES EIGHT SATEL­LITES INTO TWO DIF­FER­ENT OR­BITS IN A SIN­GLE FLIGHT

India Strategic - - CONTENTS -

NEW DELHI. In its thirty sev­enth flight ( PSLV- C35), ISRO’s Po­lar Satel­lite Launch Ve­hi­cle suc­cess­fully launched the 371 kg SCATSAT-1 Satel­lite along with seven co- pas­sen­ger satel­lites Septem­ber 26 from Satish Dhawan Space Cen­tre SHAR, Sri­harikota. This is the thirty sixth con­sec­u­tively suc­cess­ful mis­sion of PSLV. The to­tal weight of all the eight satel­lites car­ried on- board PSLV-C35 was 675 kg. PSLV-C35 is the first PSLV mis­sion to launch satel­lites car­ried on­board into two dif­fer­ent or­bits. This PSLV mis­sion was the long­est of the PSLV mis­sions con­ducted till date and was com­pleted in 2 hours 15 min­utes and 33 sec­onds af­ter lift- off.

Af­ter PSLV-C35 lift-off at 0912 hrs (9:12 am) IST from the First Launch Pad with the ig­ni­tion of the first stage, the sub­se­quent im­por­tant flight events, namely, strapon ig­ni­tions and sep­a­ra­tions, first stage sep­a­ra­tion, sec­ond stage ig­ni­tion, pay­load fair­ing sep­a­ra­tion, sec­ond stage sep­a­ra­tion, third stage ig­ni­tion and sep­a­ra­tion, fourth stage ig­ni­tion and cut-off, took place as planned. Af­ter a flight of 16 min­utes 56 sec­onds, the ve­hi­cle achieved a po­lar Sun Syn­chro­nous Orbit of 724 km in­clined at an an­gle of 98.1 de­gree to the equa­tor ( very close to the in­tended orbit) and 37 sec­onds later the pri­mary satel­lite SCATSAT-1 was sep­a­rated from the PSLV fourth stage.

Af­ter sep­a­ra­tion, the two so­lar ar­rays of SCATSAT-1 satel­lite were de­ployed au­to­mat­i­cally and ISRO’s Teleme­try, Track­ing and Com­mand Network (ISTRAC) at Ban­ga­lore took over the con­trol of the satel­lite. In the com­ing days, the satel­lite will be brought to its fi­nal op­er­a­tional con­fig­u­ra­tion fol­low­ing which it will be­gin to pro­vide weather re­lated ser­vices us­ing its scat­terom­e­ter pay­load. The data sent by SCATSAT-1 satel­lite will help pro­vide weather fore­cast­ing ser­vices to user com­mu­ni­ties through the gen­er­a­tion of wind vec­tor prod­ucts as well as cy­clone de­tec­tion and track­ing.

Af­ter the suc­cess­ful sep­a­ra­tion of SCATSAT- 1, the PSLV- C35 mis­sion con­tin­ued. Still car­ry­ing the seven co­pas­sen­ger satel­lites, the fourth stage of PSLV coasted over the South Po­lar Re­gion and then started as­cend­ing to­wards the North­ern hemi­sphere. A safe dis­tance be­tween the or­bit­ing SCATSAT-1 and PSLV-C35 fourth stage was main­tained by suit­ably ma­noeu­vring the stage.

At 1 hour 22 min­utes and 38 sec­onds af­ter lift- off as the fourth stage was in the North Po­lar Re­gion, the two en­gines of PSLV fourth stage were reignited and fired for 20 sec­onds. As a re­sult of this, it en­tered into an el­lip­ti­cal orbit mea­sur­ing 725 km on one side of the Earth and 670 km on the other.

And 50 min­utes later, as the PSLV fourth stage was again coast­ing near the south pole, its en­gines were fired for an­other 20 sec­onds. This sec­ond fir­ing made the fourth stage to en­ter into a cir­cu­lar orbit of 669 km height in­clined at an an­gle of 98.2 de­gree to the equa­tor.

37 sec­onds later, the Dual Launch Adapter was suc­cess­fully sep­a­rated from the PSLV- C35 fourth stage. 30 sec­onds af­ter this event, ALSAT-1 was the first co- pas­sen­ger satel­lite to be sep­a­rated suc­cess­fully. Fol­low­ing this, the NLS-19, PRATHAM, PISAT, ALSAT-1B, ALSAT- 2B, and Pathfinder-1 were sep­a­rated from the PSLV fourth stage in a pre­de­ter­mined se­quence thereby suc­cess­fully com­plet­ing PSLV-C35 mis­sion.

Of the seven co- pas­sen­ger satel­lites car­ried by PSLV- C35, two – PRATHAM weigh­ing 10 kg and PISAT weigh­ing 5.25 kg – are Univer­sity/ Aca­demic in­sti­tute satel­lites and were built with the in­volve­ment of stu­dents from IIT-Bom­bay and PES Univer­sity, Ban­ga­lore and its con­sor­tium, re­spec­tively.

The re­main­ing five co-pas­sen­ger satel­lites were in­ter­na­tional cus­tomer satel­lites from Al­ge­ria (three – ALSAT-1B, ALSAT-2B and ALSAT-1N), Canada (one- NLS-19) and the United States (one – Pathfinder-1).

With this launch, the PSLV’s ca­pa­bil­ity to launch satel­lites into two dif­fer­ent or­bits has been suc­cess­fully demon­strated. The to­tal num­ber of satel­lites launched by In­dia’s work­horse launch ve­hi­cle PSLV has now reached 121, of which 42 are In­dian and the re­main­ing 79 are from abroad.

Clock­wise from right top: SCATSAT-1 space­craft in­te­grated with PSLV-C35 with two halves of the heat shield seen; SCATSAT-1 un­der­go­ing a prelaunch test at ISITE, Ben­galuru; In­te­gra­tion of strap-ons to the PSLV-C35 core stage at Mo­bile Ser­vice Tower

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