Author Topic: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012  (Read 42692 times)

Online Chris Bergin

Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #80 on: 04/26/2012 12:37 AM »
Mr Chairman very happy. Notes complete success.

Online Chris Bergin

Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #81 on: 04/26/2012 12:40 AM »
This man is great! Very nice speech, noting about the stupidity of global events when they can have great events like this launch.

Offline klausd

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« Last Edit: 04/26/2012 05:25 AM by input~2 »

Offline Shturmanskie

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Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #83 on: 04/26/2012 01:35 AM »
Well Done, India!! Congratulations on lifting a very heavy satellite into orbit.

Offline input~2

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Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #84 on: 04/26/2012 05:16 AM »
USSTRATCOM has catalogued 2 objects
  • Object A 38248/2012-017A from 1st elset in 460.6km x 530.4km x 97.53° (presumably the S/C)
  • Object B 38249/2012-017B from 1st elset in 461.3km x 479.0km x 97.63° (presumably PSLV 4th stage)

  • Offline input~2

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #85 on: 04/26/2012 05:33 AM »
    Launch photos from ISRO

    Offline input~2

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #86 on: 04/26/2012 06:07 AM »
    USSTRATCOM has catalogued 2 objects
  • Object A 38248/2012-017A from 1st elset in 460.6km x 530.4km x 97.53° (presumably the S/C)
  • Object B 38249/2012-017B from 1st elset in 461.3km x 479.0km x 97.63° (presumably PSLV 4th stage)
  • According to the launch video, the achieved S/C orbit after separation was 476km x 482km x 97.6°.
    The S/C was then supposed to raise its altitude to 536km using its own propulsion subsystem

    Offline Nahavandi

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #87 on: 04/26/2012 09:59 AM »
    Some interesting amateur footage:



    Offline input~2

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #88 on: 04/27/2012 07:02 AM »
    Those TV broadcast banners that take up the bottom third of the screen really don't work with tall skinny rockets, do they?  Perhaps they could compromise, filling the sides of the screen, rather than the bottom, when they're covering a rocket launch!

     - Ed Kyle
    A better view of the lower screen with flight data in this 37 minutes video

    Offline input~2

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    Offline input~2

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #90 on: 04/27/2012 08:23 PM »
    USSTRATCOM has catalogued 2 objects
  • Object A 38248/2012-017A from 1st elset in 460.6km x 530.4km x 97.53° (presumably the S/C)
  • Object B 38249/2012-017B from 1st elset in 461.3km x 479.0km x 97.63° (presumably PSLV 4th stage)
  • Well, it appears now that Object A was PSLV 4th stage and Object B the S/C.
    The Objects have just recently been switched: old Object B (the S/C) becomes new Object A and its orbit has been raised earlier to-day from 465 x 481 km to 490 x 511 km, while new Object B (old Object A) remains in 467 x 530 km
    « Last Edit: 04/27/2012 08:25 PM by input~2 »

    Offline seshagirib

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #91 on: 04/28/2012 08:05 AM »
    ^ How can the booster be in a initial higher orbit than the s/c? where the booster engines fired again after releasing the s/c ?  Is it not better to deorbit the booster?

    Offline input~2

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #92 on: 04/28/2012 12:58 PM »
    ^ How can the booster be in a initial higher orbit than the s/c? where the booster engines fired again after releasing the s/c ?
    Good question! ;) .The higher apogee of the booster stage could be due to a collision avoidance maneuver (CAM), but I would have expected, as is the case with other launchers,  the resulting apogee of the released spacecraft to be higher than that of the booster stage..
    If anyone could describe the PSLV 4th stage CAM, it would be helpful! (the 2005 PSLV user's manual doesn't give any details on this maneuver)
    « Last Edit: 04/28/2012 01:09 PM by input~2 »

    Offline input~2

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #93 on: 04/28/2012 01:15 PM »
    Raising the S/C orbit continues:
    Earlier to-day the achieved orbit was 508 x 530 km (inclined 97.60°)

    Offline input~2

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #94 on: 04/28/2012 09:01 PM »
    http://www.isro.org/pressrelease/scripts/pressreleasein.aspx?Apr28_2012
    Quote
    April 28, 2012
    Radar Imaging Satellite (RISAT-1) successfully placed in its final orbit
                 The Radar Imaging Satellite (RISAT-1), launched by PSLV-C19 on April  26, 2012, has now been placed in its final Polar Sun-synchronous Orbit  of 536 km height.

    It may be recalled that PSLV-C19 had placed RISAT-1 in a polar  orbit of 470 km X 480 km. As planned, on April 27-28, 2012, the  satellite propulsion system was used in four orbital maneuvers to raise  height of the orbit of RISAT-1 to 536 km. The satellite is now in its  final orbital configuration and in good health. In the coming days,  various elements of the C-band Synthetic Aperture Radar will be tested  and calibrated as a prelude to payload operations.

    As compared to the optical remote sensing satellites that depend  upon sunlight, the Synthetic Aperture Radar of RISAT-1 transmits its  own radar pulses (at 5.35 GHz) to study the objects on Earth. This  facilitates 
  • cloud penetration and
  • imaging even without sunlight.
  • For RISAT-1, imaging sessions around both 6 AM and 6 PM have been chosen.

    Offline sanman

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #95 on: 04/29/2012 12:10 AM »
    Here's the liftoff from a more distant group of observers:




    Offline isro-watch

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #96 on: 05/01/2012 04:28 PM »
    Why is that PSLV-C19 launched RISAT-1 into a 480KM orbit ?
    Was the rocket not capable of launching it a few kilometers higher. The final orbit was only 526 KM ?

    Mod: Post moved from "Indian launch schedule"
    « Last Edit: 05/01/2012 06:21 PM by input~2 »

    Offline Satori

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #97 on: 05/02/2012 08:38 PM »
    Does anyone has the times of the different events on the RISAT-1 launch?

    Offline input~2

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    Offline m.prasad

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    Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
    « Reply #99 on: 05/13/2012 03:38 PM »
    ISRO has released the  RISAT-1 images! :-)

    (Ref: http://isro.org/pslv-c19/Imagegallery/satelliteimages.aspx#9 )

    ~Prasad

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