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SixtoReport: D12 Satellite Info in Post#1 - Live!

Discussion in 'DIRECTV General Discussion' started by Sixto, Jul 27, 2008.

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  1. Jan 5, 2010 #1921 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    Thanks for your support. ;)
     
  2. Jan 5, 2010 #1922 of 10270
    P Smith

    P Smith Mr. FixAnything

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    Who knows ...
     
  3. Jan 6, 2010 #1923 of 10270
    smiddy

    smiddy Tain't ogre til its ogre

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    Fun fun fun! Anyone have a guest as to when this pup will get into its testing spot? I'm going to say January 24, 2010. :D
     
  4. Jan 6, 2010 #1924 of 10270
    Sixto

    Sixto Well-Known Member

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    From the FCC Filing: "After launch and orbit raising maneuvers, DirecTV-12 will be located at 76° [no earlier than about 2/15/2010]."
     
  5. Jan 6, 2010 #1925 of 10270
    smiddy

    smiddy Tain't ogre til its ogre

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    Well, I guess my guess sucks then. :D
     
  6. Jan 6, 2010 #1926 of 10270
    Ernie

    Ernie AllStar

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    Super Synchronous Transfer Orbits are used to reduce the energy requirements of the inclination change.

    Ernie
     
  7. Jan 6, 2010 #1927 of 10270
    Sixto

    Sixto Well-Known Member

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    Similar ...
    Code:
    Name			DirecTV-12
    NORAD #			36131
    COSPAR designator	2009-075-A  
    Epoch (UTC)		01-06-2010 04:54:40
    Orbit # at Epoch	14
    Inclination		9.705
    RA of A. Node		98.434
    Eccentricity		0.4477659
    Argument of Perigee	1.002
    Revs per day		1.46597794
    Period			16h 22m 16s (982.27 min)
    Semi-major axis		32 733 km
    Perigee x Apogee	11 698 x 41 011 km
    Element number / age	18 / 0 day(s)
    
    Lon			58.3449° E
    Lat			6.3841° N
    Alt (km)		32 778.200
    
    [B][U] # [/u] [u]   Date   [/u] [u]Time GMT[/u] [u]Perigee[/u]  [u]Apogee[/u] [u]Chg-Hrs[/u] [u]  Day [/u]  [u]  Long  [/u] [u]  Lat  [/u] [u]Inclin[/u][/B]
    Target (for testing) is 35,786 x 35,786                  76.00°W  0.00°N  0.00°[B][COLOR="Blue"]
    018 01-06-2010 04:54:40 11,698 x 41,011 +13.52H @ 8.19D  58.34°E  6.38°N  9.70°[/COLOR][/B]
    016 01-05-2010 15:23:22 11,698 x 41,012 + 8.57H @ 7.63D  66.91°W  1.60°N  9.70°
    015 01-05-2010 06:48:52 [B][COLOR="Red"]11,698[/COLOR][/B] x [B][COLOR="Red"]41,011[/COLOR][/B] +71.94H @ 7.27D 173.68°E  9.53°S  [B][COLOR="Red"]9.70°[/COLOR][/B]
    013 01-02-2010 06:52:28  5,093 x 38,354 +26.04H @ 4.27D 106.35°W  0.01°S 20.52°
    012 01-01-2010 04:49:48  5,097 x 38,352 + 7.42H @ 3.19D  74.48°W  0.01°S 20.52°
    
    [URL="http://www.dbstalk.com/showthread.php?t=164555"]Post#1[/URL] has the complete history. The last 5 updates are above.
     
  8. Jan 6, 2010 #1928 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    I know. See my posts earlier in the thread about orbital mechanics and Ernie's post about supersynchronous transfer orbits and inclination changes. As Darth Vader would say, "I find your lack of faith . . . disturbing." :lol:
     
  9. Jan 6, 2010 #1929 of 10270
    hdtvfan0001

    hdtvfan0001 Well-Known Member

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    Would that be when the extend the solar arrays fully then?
     
  10. Jan 6, 2010 #1930 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    Probably so.
     
  11. Jan 6, 2010 #1931 of 10270
    hdtvfan0001

    hdtvfan0001 Well-Known Member

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    Thanks Lefty - I assmued it needed to at least be "parked" in a local before it happened. That all seems to be the next "big step" along the way to having a live bird with all its functions working.
     
  12. Jan 6, 2010 #1932 of 10270
    bakers12

    bakers12 ΔS > 0

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    Don't take it so hard just because you made a donkey out of yourself. :p
     
  13. Jan 6, 2010 #1933 of 10270
    HoTat2

    HoTat2 Hall Of Fame

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    Now this sounds like a very good possible explanation;

    The only problem is as Sixto posted yesterday here;

    http://www.dbstalk.com/showthread.php?p=2322572#post2322572

    D10 which was also launched from Baikonur into the same type of inclined GTO did not use such a Super Synchronous Transfer Orbit with an apogee exceeding 41,000 Km at any time, yet D11 which used an equatorial launch for an ~0° inclination did as with D12. :confused:

    Oh well whatever the case ... time for the mourning coffee ... :coffee
     
  14. Jan 6, 2010 #1934 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    It seems to me that both D11 and D12 are using more optimized trajectories (lower fuel usage) than did D10; however, D10 had more riding on speed and fast arrival at its testing slot than did either D11 or D12.
     
  15. Jan 6, 2010 #1935 of 10270
    smiddy

    smiddy Tain't ogre til its ogre

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    I deserve that, I guess. :lol:

    The way things have been going for DirecTV though I think they will be as close to the date Sixto showed as possible. I am so looking forward to it!
     
  16. Jan 6, 2010 #1936 of 10270
    P Smith

    P Smith Mr. FixAnything

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    That good to know you got it after Ernie as we are all as well. :D
    Wouldn't be useful clarify it as:
    High-GTO: super-synchronous transfer orbits with apogees between
    41000 km and 50000 km.

    because of other similar type:
    Super-GTO. The truly spectactular super-synchronous transfer orbits
    used by some recent commercial satellites reach apogees previously only explored by deep space research probes.

    http://www.planet4589.org/space/jsr/back/news.310
     
  17. Jan 6, 2010 #1937 of 10270
    hdtvfan0001

    hdtvfan0001 Well-Known Member

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    I call Geekfight....:D:lol:
     
  18. Jan 6, 2010 #1938 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    Actually, I posted quite some time ago that inclination changes are made at apogee for delta-V/fuel efficiency reasons. The higher the apogee the more efficient the maneuver. So bite me. :)
     
  19. Jan 6, 2010 #1939 of 10270
    smiddy

    smiddy Tain't ogre til its ogre

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    You guys make me laugh! !rolling

    Either way it gets there, I just want it there, to test, then, to get me some more of those beautiful High Definition channels. And that is what is important, not how and why it gets to where it needs to go, but completing those tests and getting me more HDTV! :D

    Ok, it is important too, I was just kidding. You guys are still funny though. :lol:
     
  20. Jan 6, 2010 #1940 of 10270
    tuff bob

    tuff bob Icon

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