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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. Dec 30, 2009 #1741 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    Just check out Sixto's comparison with the historical data from D10. It should be very similar.
     
  2. Dec 30, 2009 #1742 of 10270
    Sixto

    Sixto Well-Known Member

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    Another one of those weird states where updates are sometimes out of order. Update#5 timestamp is before #2. Will add to table anyway, but place it before #2.
    Code:
    Name			DirecTV-12
    NORAD #			36131
    COSPAR designator	2009-075-A  
    Epoch (UTC)		12-29-2009 15:18:56
    Orbit # at Epoch	1
    Inclination		20.576
    RA of A. Node		99.111
    Eccentricity		0.5719809
    Argument of Perigee	359.771
    Revs per day		1.97955113
    Period			12h 07m 26s (727.43 min)
    Semi-major axis		26 793 km
    Perigee x Apogee	5 090 x 35 740 km
    Element number / age	5 / 0 day(s)
    
    Lon			131.1134° E
    Lat			0.0101° S
    Alt (km)		5 059.210
    
    [U] # [/u] [u]   Date   [/u] [u]  Time  [/u] [u]Perigee[/u]  [u]Apogee[/u]  [u]Chg-Hrs[/u] [u]  Day [/u]  [u] Long  [/u]  [u]  Lat  [/u]  [u]Inclin[/u]
    004 12-29-2009 18:30:07  5,087 x 35,793  +  .2H  @  .6D  127.27°  10.81°N  20.55°
    003 12-29-2009 18:19:52  5,084 x 35,795  +  .8H  @  .6D  127.13°  11.56°N  20.57°
    002 12-29-2009 17:32:06  5,087 x 35,793  + 2.2H  @  .6D  128.96°  15.32°N  20.58°
    005 12-29-2009 15:18:56  5 090 x 35 740  +11.3H  @  .5D  131.11°   0.01°S  20.58°
    001 12-29-2009 03:58:40    424 x 35,759           Start  128.96°   1.05°S  45.52°
     
  3. Dec 30, 2009 #1743 of 10270
    kmax

    kmax AllStar

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    Pardon my ignorance (and I've searched for an answer) but what exactly is BSS and its intended use, or ultimate capabilities?

    And thank you everyone involved in providing information on the launch and current position. I'm amazed watching it all come together.
     
  4. Dec 30, 2009 #1744 of 10270
    oldfantom

    oldfantom Icon

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    OK, this is a dumb question as well, but are TLE's ZULU time or are they impacted by the local time zone in a tracking station?
     
  5. Dec 30, 2009 #1745 of 10270
    doctor j

    doctor j Hall Of Fame DBSTalk Club

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    UTC time code


    http://en.wikipedia.org/wiki/Coordinated_Universal_Time

    Element Set Epoch
    04236.56031392The first two digits ('04') indicate the year. Add 1900 for years >= 57, and 2000 for all others.
    The remainder of the field ('236.56031392') is the day of the year.

    Doctor j
     
  6. Dec 30, 2009 #1746 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    BSS is also known as "reverse band" (hence the "RB" designations for the next three planned Directv satellites). It's essentially using the Ku band frequencies currently used for uplinks to satellites as downlinks as well. Part of the reason developing BSS capabilities for direct-to-home satellite transmission has taken so long is because the FCC and DBS providers have to be very careful about potential interference with uplink transmissions.

    It's not yet clear what use BSS will be, ultimately. There are political/bureaucratic fights going on right now in the FCC about the ITU's assignment of the 103W BSS slot to more than one nation, and how the administrative agencies in charge of radio communications in multiple nations are supposed to coordinate their licensing procedures (see dozens of previous posts in this thread for more on that).
     
  7. Dec 30, 2009 #1747 of 10270
    kmax

    kmax AllStar

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    Thank you. A lot of this over my head, but is the goal then to conserve frequency spectrum space?
     
  8. Dec 30, 2009 #1748 of 10270
    Sixto

    Sixto Well-Known Member

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    Did tweak the comparison format last night, added the latitude as well.
    Code:
    [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]
    004 12-29-2009 18:30:07  5,087 x 35,793  +  .2H  @  .6D  127.27°  10.81°N  20.55°
    003 12-29-2009 18:19:52  5,084 x 35,795  +  .8H  @  .6D  127.13°  11.56°N  20.57°
    002 12-29-2009 17:32:06  5,087 x 35,793  + 2.2H  @  .6D  128.96°  15.32°N  20.58°
    005 12-29-2009 15:18:56  5 090 x 35 740  +11.3H  @  .5D  131.11°   0.01°S  20.58°
    001 12-29-2009 03:58:40    424 x 35,759           Start  128.96°   1.05°S  45.52°
    In the future, after we get Update#6, will only show the past 5 updates's in the post, but post#1 will always have all the updates.

    Also, is there anything else important for the comparison lines? With the limitation that I don't want anyone to have to scroll left/right within the "code" box.
     
  9. Dec 30, 2009 #1749 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    You might want to delete the lat/long in the tables as they may be confusing to some. At this point the vehicle is in a very elliptical, inclined orbit and the actual lat/long will be changing continuously for some weeks yet. It might be simpler for people's understanding to just not post it.
     
  10. Dec 30, 2009 #1750 of 10270
    Sixto

    Sixto Well-Known Member

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    Yep, I keep bouncing back-and-forth between being easy enough for new folks tracking this for the first time, and those experienced who want all the details. It seemed interesting to see all the changes, so everyone will be able to see how dramatically things change, until it starts to settle down in a few weeks.

    I also need to refine the notice of TLE updates. I had a way to get almost immediate TLE updates last time, but haven't had access to the same yet for D12. So (for now) anyone seeing a change, just post that there's a change, and I'll get the tables updated.
     
  11. Dec 30, 2009 #1751 of 10270
    HoTat2

    HoTat2 Hall Of Fame

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    Thanks for the suggestion LL;

    But that comparison list posted earlier by Sixto does not list the inclination histories to see if the Boeing sequence is indeed followed. Particularly how it varied for D10 on days 2, 3, and 4 prior to its perigee rising significantly on day 6.

    http://www.dbstalk.com/showthread.php?p=2315517#post2315517

    Unless there is another comparison list I'm not aware of you're referring to.
     
  12. Dec 30, 2009 #1752 of 10270
    HoTat2

    HoTat2 Hall Of Fame

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    And in addition you and others may want to check out Tom's excellent post on this topic back in early October for the layman;

    http://www.dbstalk.com/showthread.php?p=2238506#post2238506
     
  13. Dec 30, 2009 #1753 of 10270
    hdtvfan0001

    hdtvfan0001 Well-Known Member

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  14. Dec 30, 2009 #1754 of 10270
    Sixto

    Sixto Well-Known Member

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    I have the data. Will post it later ...
     
  15. Dec 30, 2009 #1755 of 10270
    smiddy

    smiddy Tain't ogre til its ogre

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    Here are a couple of links:



    I hope that helps. :)
     
  16. Dec 30, 2009 #1756 of 10270
    syphix

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    EXCELLENT post that helps clarify a lot. But still the "unknown" remains: (a) What does DirecTV intend to use BSS for exactly? More channels, broadband data/internet? (b) Will D12's BSS payload be used for actual customer use, or still for more testing (perhaps field testing with select customers)?
     
  17. Dec 30, 2009 #1757 of 10270
    Sixto

    Sixto Well-Known Member

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    Initial guess is to satisfy the future LiL must carry. Must carry ALL HD local if any local. Recent regulation starting in future.
     
  18. Dec 30, 2009 #1758 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    No one knows. There's lots of speculation but that's all, so far (publicly anyway). In any event, the FCC authorization and license if direct-to-home service, so those four spotbeams cannot be used for backhauling (as some have speculated) without a modification of those licenses. I think it's possible BSS will be used to provide more locals and RSNs, plus perhaps some specialty content, like high-speed background data "push" services (for faster-than-realtime movie downloads to DVRs, etc).

    Time will tell.
     
  19. Dec 30, 2009 #1759 of 10270
    sdk009

    sdk009 Icon

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    Did the FCC ever rule about LIL sub-channels carriage? Maybe this is where D12's BSS will come into play.
     
  20. Dec 30, 2009 #1760 of 10270
    Sixto

    Sixto Well-Known Member

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    Here's a start ... day from launch, TLE#, Low, High, Long, Lat, and inclination for both D10 and D12:
    Code:
    D10  D10  D10 D10   D10    D10	   D10	  D12   D12 D12	 D12   D12     D12    D12
    Day  TLE  Low High  Long   Lat	  Inclin  Day   TLE Low	 High  Long    Lat    Inclin
    0.11   1  414 35813 58.51  -0.03  45.54  0.15  1    424 35759 128.96  - 1.05  45.52
    0.58   2 4900 35783 130.95  0.00  21.40  0.62  5   5090 35740 131.11  - 0.01  20.58
                                             0.72  2   5087 35793 128.96   15.32  20.58
                                             0.75  3   5084 35795 127.13   11.56  20.57
                                             0.76  4   5087 35793 127.37   10.81  20.55
    2.09   3 4919 35792 58.45  -1.86  21.34	
    Heading out ... be back tonight ...
     
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