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D10 Satellite TECH THREAD - HD Testing Schedule / Press Releases / Location

Discussion in 'DIRECTV General Discussion' started by Sixto, Jul 6, 2007.

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  1. Jul 13, 2007 #101 of 2718
    man_rob

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    Is the ground path changing? D10 had been looping back over Africa, just brushing over the Atlantic briefly. Right now, it is almost to Brazil, after drifting westward from the African coast.
     
  2. Jul 13, 2007 #102 of 2718
    LameLefty

    LameLefty I used to be a rocket scientist

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    No, it's still in the same basic transfer orbit. They're apparently making only small corrections and adjustments to the orbit. As of this morning it's still in a very elliptical orbit with an apogee near GSO altitude, but a perigee of only a few thousand miles.

    These renderings are of the current orbital position based on today's TLEs - the first is a polar projection showing how elliptical the orbit is still. The second is an equatorial projection at 103W (the final slot) showing how inclined the orbit is still.

    The ground tracks are essentially the same since shortly after launch - what's happening is that the Earth's rotational period is not the same as the satellite's orbital period, so the ground tracks appear to move across the earth; a few days ago the "squiggles" were around Hawaii.
     

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  3. Jul 13, 2007 #103 of 2718
    oakwcj

    oakwcj Lower Echelon

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    D*'s FCC filing indicates that the D10 won't be placed into its testing location until about August 17. What's the rationale for almost six weeks in GTO?
     
  4. Jul 13, 2007 #104 of 2718
    Earl Bonovich

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    Length exposure to space, to make sure there are no other issues.

    Before "bringing it in" amongst a lot of other equipment.
     
  5. Jul 13, 2007 #105 of 2718
    LameLefty

    LameLefty I used to be a rocket scientist

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    Which is a summary of what I said, in post #96 to this thread:

    ;)
     
  6. Jul 13, 2007 #106 of 2718
    mnbulldog

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    I say we name her Dawn - as in Dawn of a New Age.

    mmmmm ... HD
     
  7. Jul 13, 2007 #107 of 2718
    Drew2k

    Drew2k New Member

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    How about Heidi? HD ... Heidi. :)
     
  8. Jul 13, 2007 #108 of 2718
    P Smith

    P Smith Mr. FixAnything

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    There are more considerations for bringing a sat to that semi-final GSO point : 'traffic' - you must have clear path for many turns, fuel consumption for the maneuver, ie for quick req more fuel.
     
  9. Jul 13, 2007 #109 of 2718
    Spanky_Partain

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    <= That's my dogs name!
     
  10. Jul 13, 2007 #110 of 2718
    Drew2k

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    It was also the name of the first puppy I remember as a kid. Our dachsund named Lady had a litter, and the one we kept we named Heidi. :)
     
  11. Jul 13, 2007 #111 of 2718
    Diana C

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    Mid-August is when DirecTV will start testing...Boeing will test before that. It won't take 6 weeks JUST to get to GEO.

    Also, the ground track seems to loop because the earth is moving under the satellite (at different relative speeds depending on altitude. At some point the apogee will approach the GEO target. A few orbits before that, they will start raising the perigee, so that it reaches a round GEO just as it arrives on station.
     
  12. Jul 14, 2007 #112 of 2718
    sat2631

    sat2631 Cool Member

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    It's been drifting for the last six days at an inclination of about 21 degrees but now it got moved to 14 degrees.

    DIRECTV 10
    1 31862U 07032A 07194.34383294 -.00000156 00000-0 10000-3 0 133
    2 31862 14.6135 300.1535 4953083 359.9408 359.7613 1.75213280 02
     
  13. Jul 14, 2007 #113 of 2718
    bakers12

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    The eccentricity is very slightly less, too. Apparently, there's been a small orbital adjustment. I need a life. This is way too fascinating. :hurah:
     
  14. Jul 14, 2007 #114 of 2718
    MrDad0330

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    I am using the N2yo site to monitor the position of it but is there any way to know if everything is going ok, ie. i assume the solar panels deployed but it everything functioning at this point as it is suppose to? Also, it is far from being in a geo orbit, it is all over the place around the globe, is this normal?
     
  15. Jul 14, 2007 #115 of 2718
    Halo

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    Everything looks normal from the outside but it would be great if someone from Boeing could post updates. They won't deploy the solar panels until after the apogee burns.

    It's still in GTO, so yes. If this launch had been by SeaLaunch (from directly on the equator) then there would be very little or no inclination. Instead of seeing the figure-eights we would see D10 going back and forth over the equator until the orbit was circularized.

    Inclination is at 14.65 degrees. Still waiting to see perigee.
     
  16. Jul 14, 2007 #116 of 2718
    MrDad0330

    MrDad0330 Godfather

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    Sorry, I just read all the posts...I should have been in here earlier to look at all the great info from your posts. I am beginning to understand why it appears to change directions, it is still hard to visulize but its coming...lol.. btw..I like Heidi for HD although D10 is fine too..
     
  17. Jul 14, 2007 #117 of 2718
    Halo

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    inclination: 14.65 degrees
    perigee: 5117 Miles
     
  18. Jul 14, 2007 #118 of 2718
    LameLefty

    LameLefty I used to be a rocket scientist

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    As of about 9:31 am CDT today:
     

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  19. Jul 14, 2007 #119 of 2718
    MrDad0330

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    I just sent an email to Boeing asking them if they could post events coming up for d10 and its current status...
     
  20. Jul 14, 2007 #120 of 2718
    Racer88

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    The rationale is it will have a service life of approximately 15 years when it gets there vs. a much lower service life if they try to get it there any faster.
     
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