NASA & World Space Exploration...News, Views, Photos & videos

Discussion in 'Members' Club Room' started by bd popeye, Jul 2, 2012.

  1. TerraN_EmpirE
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    TerraN_EmpirE Tyrant King

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    http://www.planetary.org/blogs/guest-blogs/2017/20170125-proton-rocket-grounded.html
     
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  2. bd popeye
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    bd popeye The Last Jedi
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    HI RES
     
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  3. TerraN_EmpirE
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    TerraN_EmpirE Tyrant King

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    http://www.theherdnow.com/a-soccer-...space-aboard-the-international-space-station/
     
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  4. Equation
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    Equation Lieutenant General

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    How neat, such a unique story. Clear Lake High School are known for their soccer power house in the Houston area for both boys and girls varsity teams.
     
  5. TerraN_EmpirE
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    TerraN_EmpirE Tyrant King

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    http://aviationweek.com/space/dream-chaser-flying-restart
     
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  6. bd popeye
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  9. Dolcevita
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    Dolcevita Senior Member

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    https://www.seradata.com/normally-r...-ses-14-and-al-yah-3-in-wrong-transfer-orbit/

    Normally reliable Ariane 5 rocket undershoots dropping off SES-14 and Al Yah 3 in wrong transfer orbit
    by David Todd | Jan 26, 2018
    The Ariane 5 rocket has had its first actual launch failure – or rather partial failure – after 82 successful flights performed over 15 years. Following its apparently successful lift off from its Kourou launch site at 1920 GMT on 25 January 2017, the Ariane 5 ECA flight VA241 carrying the SES-14 and Al-Yah 3 communications satellites had an apparent launch anomaly when contact was lost seconds into the firing of its upper stage. Despite no signal from the launch vehicle (second tracking station located in Natal, Brazil could not pick this up), the first and heaviest of the satellite pair SES-14 was later confirmed as having separated as planned, as was the Al-Yah 3 spacecraft which had been due to be released some eight minutes later.

    However SES-14’s owner and operator SES later confirmed that the satellite had been undershot into a lower transfer orbit than planned. In fact the launch was originally headed for a “super-synchronous” elliptical transfer orbit (45,234 x 250km orbit at 3 degrees inclination) whose apogee was over 9,000km higher than the 36,000km of a “normal” elliptical geosynchronous transfer orbit (GTO). This higher apogee is more efficient orbital inclination removal and more fuel efficient overall despite the fact that this apogee has to be lowered back to 36,000km (in addition to the perigee being raised), in order to reached the circular 36,000km geostationary Earth orbit (GEO).

    The fact that Arianespace was “aiming high” for this flight(super-synchronous transfer orbits are rarely used by Arianespace) might have made the result of the launch undershoot/inaccuracy less damaging than it otherwise might have been the case – especially given the inclination error. Unofficial reports indicate that the spacecraft were left in orbits circa 43,200 x 232km which is only slightly lower than planned, but with inclination of 20 degrees – dramatically different from that expected. This would seem to indicate a major guidance or software error during the flight. A misdirected launch might account for the loss of signal if the upper stage was heading in an unexpected direction.

    SES later reassured its clients and insurers that the spacecraft was still expected to reach its final position in GEO using its electric thruster propulsion, albeit some four weeks later than planned. The spacecraft was insured for US$350 million although no claim is expected.

    [​IMG]
    Ariane 5 ECA launch carrying Al Yah 3 and SES-14. Courtesy: Arianespace



    There was no word from Yahsat, the owners of Al-Yah 3, except to note that it was on its way to its GEO position. It carries both conventional bi-propellant chemical apogee motor propulsion for orbital circularisation and inclination removal, but has electric thrusters for small orbital manoeuvres. These might yet be pressed into service during the recovery. As such, any recovery may well incur a significant life loss and hence may generate an insurance claim. That spacecraft was insured under two main policies – one covering the satellite to a value of US$195.8 million for launch plus one year in orbit, which in addition had a further policy covering the satellite to an extra US$30 million for total loss only.

    A full investigation into the cause of the partial failure is now underway. All future Ariane 5 flights are expected to be suspended until the results of this are evaluated.
     
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  10. PanAsian
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    PanAsian Major

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    Can't believe no one posted anything on SpaceX's launch and landing yesterday.

    Here’s what’s next for SpaceX after Falcon Heavy’s first flight
    More launches, bigger rockets, and deeper challenges await
    By Sean O'[email protected] Feb 7, 2018, 10:31am EST
    https://www.theverge.com/2018/2/7/16983040/spacex-falcon-heavy-rocket-launch-schedule-spaceflight



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