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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. EaglePC

    EaglePC Icon

    Apr 14, 2007
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  2. donshan

    donshan Godfather

    Jun 18, 2007
    Very good explanation!:) I thought a Star Chart with satellites might help to see the REALLY BIG picture you describe so well.

    The Norad data base tracks 356 satellites around the earth in geostationary orbit. When I plot them in my astronomy program "The Sky" our southern sky is so full of satellites some plot right on top of another in the sky chart below. The D* fleet is labeled approximately by the arrows. I identified the D* birds by using the "find" function that puts a red circle around the correct satellite on my computer screen. I counted about 65 satellites stationary in our southern sky. The DirecTV 4s, 8, and 9s are so close together at the scale of this chart you can see why small dish alignment is not extremely critical as posts above indicated.


    The view is looking south (just like my DirecTV dish) from the Pacific Northwest at 11:52 AM PDT Aug 31. You can see the sun's location just above the row of satellites. Those stars and planets are there even if the sunlight keeps us from seeing them.

    I counted about 65 satellites in our southern sky so maneuvering D10 to its assigned slot took quite a bit of care to avoid collisions. It also indicates to me a reason to "drift" the satellite carefully to its new slot. We are focused on D10, but this fleet of satellites involves all kinds of communication, data links, TV networks, Sat radio, weather sats and broadcasts to Mexico and South America.

    I have indicated the approximate locations of the DirecTV satellites in this total fleet. Just above the line of active satellites are strays I believe to be the "Satellite graveyard" as two I labeled are now dead and classified as Junk, but NORAD still tracks them.

    As cygnusloop states above, the satellites are moving at the same rate as the earth towards the East which creates our view of the sun and stars rising in the East and moving West. On the star chart the satellites stay stationary, but the sun and stars are in constant motion behind them. This is important in order to understand some of the data in Ken's posts as the following example from Aug 29:

    The star chart will explain a few of the terms in Ken's list. We are watching the first two items longitude and latitude as they are D10's position relative to earth . However the RA (Right Ascension), Dec ( Declination) and Constellation refer to the celestial coordinate system for the sky behind the satellites. RA changes minute by minute with time with the 24 hour earth rotation , and both RA and Dec also change more slowly each month as the earth goes on a year journey around the sun. Celestial coordinates are defined by Nasa at:


    On my chart the RA is time listed in hours is at the bottom of the chart, so in 1 hour the sky will move behind D10 the width of the vertical blue lines. Declination is the distance below or above the celestial equator and will change slowly as the earth travels in a circle around the sun in a year. The earth's rotational axis is tilted so we see seasonal variations ( sun low in winter). Stars are so far away their RA and Dec change very slowly due to earth wobble and the stars actual motion. RA and Dec positions of the Sun, moon, and planets change rapidly.

    Thus, the constellation that D10 is listed as being in is changing rapidly during the earth's 24 hour cycle each day and also changing slowly by the earth's trip around the sun. Each month we get a different set of stars overhead ( and behind D10). This is why stating the time that the data were calculated is useful, because even an hour later these values will be quite different and a new constellation could be behind D10

    The Azm and Elev. are the direction and angle up are specific for Ken's Latitude/longitude location and he could use them to adjust his dish. The will have different values for each different location on earth.

    Finally when they slow down D10 to let the other GSO satellites catch up a little (as cygnusloop described ) they have to be careful not to get "rear ended" because there is a lot of traffic up there. Just joking!:D

    Edit: sorry chart did not post I will see what is the matter.

    Attached Files:

  3. Smthkd

    Smthkd Icon

    Sep 1, 2004
    :read: Talking about reading a book! :read:
  4. Richi

    Richi Mentor

    Sep 13, 2006
    It is now 0002hrs Zulu!!!!! LET THE DRIFTING BEGIN!!!!!! LET THERE BE HD EVERYWHERE!!!!!
  5. PoitNarf

    PoitNarf New Member

    Aug 19, 2006
    I hope they remember to use their turn signals properly when they start to move. Don't want the sat police to give them a moving violation ;)
  6. Dave

    Dave Icon

    Jan 28, 2003
    Now for my knowledge question of the day.
    Who is in charge of actually moving the Sat to its new location?
    DirectV or Boing? I would think that Boing would do the thruster moves for them. Perhaps I am wrong. Perhaps some of you more knowledable members may know the answer.
  7. wilmot3

    wilmot3 Legend

    Jul 24, 2007
    this may be a dumb question but is there anyway to tell when it starts to move. Cause they don't update the tle that often do they?
  8. Ken984

    Ken984 Active Member

    Dec 31, 2005
    No we need tles to see where it is, and even then we are just projecting where it is and what its doing.
  9. Sep 1, 2007 #1649 of 2718
    Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

    Nov 15, 2005
    At this point, I am guessing Boeing because we have not seen a turn-over announcement. But since this was a deliver on the ground with Boeing doing support work after the change of ownership and launch, I'm not sure.

  10. Sep 1, 2007 #1650 of 2718

    EaglePC Icon

    Apr 14, 2007
    sat 103b all 0's still
    i give up
  11. Sep 1, 2007 #1651 of 2718

    krock918316 Hall Of Fame

    Mar 5, 2007
    Eagle - today was the first day they could start moving D10. That will take several days (from what I've seen)
  12. Sep 1, 2007 #1652 of 2718

    Hdhead Hall Of Fame

    Jul 30, 2007
    MOVING DAY! Fire up those thrusters and for good measure hit us with a transponder signal so we may have an orgasmic experience!
  13. Sep 1, 2007 #1653 of 2718

    richlife Hall Of Fame

    Dec 4, 2006
    First of all, many thanks to the techies who post the great status and technical information here. And thanks for pursuing the effort to eliminate or reduce the chaff that was threatening to overun your thread. I sometimes get in over my head here, but you're providing a fascinating service to those who have some background and any interest. Keep on truckin'!

    And my thanks for those who created the Anticipation thread and those who continue to take their "chaff" over there. Not necessarily as informative, but almost as entertaining. :lol:
  14. Sep 1, 2007 #1654 of 2718

    Interceptor Legend

    Jul 19, 2007
    Once again, I see no evidence yet of the move, according to the latest tle. :(
    Lefty or Ken, care to give your take? Maybe just not enough time between the beginning of the move, and the element set? The new elset was created at 0940 hours UTC today. Wouldn't there have to be enough time between the thruster fire, and the elset to extrapolate its new position?

    DIRECTV 10
    1 31862U 07032A 07244.40345683 -.00000110 00000-0 10000-3 0 709
    2 31862 000.0973 291.7904 0000066 126.3922 324.6780 01.00272545 589

    1DIRECTV 10
    Lon 102.5648° W
    Lat 0.0078° S
    Alt (km) 35 785.700
    Azm 207.1°
    Elv 47.7°
    RA 07h 06m 50s
    Decl -5° 22' 12"
    Range (km) 37 221.994
    RRt (km/s) 0.000
    Vel (km/s) 3.075
    Direction Descending
    Eclipse No
    MA (phase) 50.8° (36)
    TA 50.8°
    Orbit # 59
    Mag (illum) ? (19%)
    Constellation Mon


    Name DIRECTV 10
    NORAD # 31862
    COSPAR designator 2007-032-A
    Epoch (UTC) 2007-09-01 09:40:58
    Orbit # at Epoch 58
    Inclination 0.097
    RA of A. Node 291.790
    Eccentricity 0.0000066
    Argument of Perigee 126.392
    Revs per day 1.00272545
    Period 23h 56m 05s (1436.8 min)
    Semi-major axis 42 165 km
    Perigee x Apogee 35 786 x 35 787 km
    BStar (drag term) 0.000100000 1/ER
    Mean anomaly 324.678
    Propagation model SDP4
    Element number / age 70 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group N/A
  15. Sep 1, 2007 #1655 of 2718

    Ken984 Active Member

    Dec 31, 2005
    Tracking software just predicts the position so if you load this into Orbitron the current location is 102.5645. These "moves" may be necessary to make the final drift to its home location more direct, its certainly not going too far with the eccentricity this low.
  16. Sep 1, 2007 #1656 of 2718

    Interceptor Legend

    Jul 19, 2007
    Yeah, that's what I noticed. I ran it with this tle in simulation mode through a couple of days, and it looks like it has not starting the move west yet. I'll bet the next tle will show it though! ;)
  17. Sep 1, 2007 #1657 of 2718

    EaglePC Icon

    Apr 14, 2007
    maybe there waiting to sept 4 to do the move after the holiday
  18. Sep 1, 2007 #1658 of 2718
    The Scotsman

    The Scotsman AllStar

    Sep 1, 2007
    DirecTV 10 appears to have started moving westwards. Checking on n2yo.com, the purple tracking line shows movement to the right. It's ever so slight, but this might be what everyone's been waiting for.
  19. Sep 1, 2007 #1659 of 2718
    The Scotsman

    The Scotsman AllStar

    Sep 1, 2007
    When I say movement to the right, I really mean movement to the left!! It was my first post, so please excuse. Checking on the TV screen, it's still zero's as expected.
  20. Sep 1, 2007 #1660 of 2718

    Ken984 Active Member

    Dec 31, 2005
    N2yo is still using a tle from yesterday it is not correct. Right now its at 102.5639 and it has been drifting east all day.
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