DIRECTV Satellite Discussion D-15 @103W

Discussion in 'DIRECTV General Discussion' started by Gary Toma, Jun 4, 2014.

  1. Ken984

    Ken984 Active Member

    1,155
    11
    Dec 31, 2005
    Bossier...
    Its above GEO now should start drifting west.

    Name DIRECTV 15
    NORAD # 40663
    COSPAR designator 2015-026-A
    Epoch (UTC) 2015-07-20 06:04:13
    Orbit # at Epoch 58
    Inclination 0.059
    RA of A. Node 228.576
    Eccentricity 0.0002051
    Argument of Perigee 179.893
    Revs per day 1.00211104
    Period 23h 56m 57s (1436.95 min)
    Semi-major axis 42 182 km
    Perigee x Apogee 35 795 x 35 812 km
    BStar (drag term) 0.000000000 1/ER
    Mean anomaly 272.732
    Propagation model SDP4
    Element number / age 999 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group Geostationary


    1DIRECTV 15
    Lon 67.6974° W
    Lat 0.0088° S
    Alt (km) 35 811.380
    Azm 137.6°
    Elv 42.9°
    RA 14h 17m 00s
    Decl -5° 11' 32"
    Range (km) 37 581.788
    RRt (km/s) 0.000
    Vel (km/s) 3.073
    Direction Ascending
    Eclipse No
    MA (phase) 162.1° (115)
    TA 162.1°
    Orbit # 59
    Mag (illum) ? (51%)
    Constellation Vir
     
  2. Jacob Braun

    Jacob Braun King of Awesome

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    Tulsa, OK
    It's about time!
     
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  3. bakers12

    bakers12 ΔS > 0

    1,972
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    May 29, 2007
    Chicago -...
    I like to look at revs/day to see if it's drifting. 1.00270 is geosynchronous. A smaller number means it's drifting to the West.

    Revs per day 1.00211104
    Period 23h 56m 57s (1436.95 min)

    Period will tell the same thing, but it's just not my favorite.
     
  4. The Scotsman

    The Scotsman AllStar

    102
    0
    Sep 1, 2007
    When I zoom in on n2yo, I see a yellow trace line which D15 seems to follow. What is that exactly? Is it the predicted path or the mandatory path?
     
  5. doctor j

    doctor j Hall Of Fame DBSTalk Club

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    A very very minor drift at present.
    At this rate it won't be at 103 till Thanksgiving!!

    Maybe a bit more adjustments coming :)
     
  6. HoTat2

    HoTat2 Hall Of Fame

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    Los...
    Looks like both as the actual ground track of the satellite resulting from it's drift west combined with it's slight orbital inclination describes a very low amplitude serpentine path as it drifts westward around the earth.




    Sent from my SGH-M819N using Tapatalk
     
  7. slice1900

    slice1900 Well-Known Member

    11,087
    1,684
    Feb 14, 2013
    Iowa
    So I wonder if they will need to request another small extension for RB-2, since the last extension was for July 31 and D15 won't make it to 103 until August? Or is the fact they've completed IOT and the satellite is en route enough?
     
  8. fleckrj

    fleckrj Icon

    1,569
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    Sep 4, 2009
    Cary, NC
    Actually, I am pretty sure it would not be until January 3, 2016 at the current rate; however, I expect that by the next update the altitude will be higher, which means revolutions per day will be lower, the period will be longer, and the drift will speed up significantly.
     
  9. Ken984

    Ken984 Active Member

    1,155
    11
    Dec 31, 2005
    Bossier...
    New TLE. Drifting quite a bit faster. Should reach 103 on August 31st according to Orbitron.

    Name DIRECTV15
    NORAD # 40663
    COSPAR designator 2015-026-A
    Epoch (UTC) 2015-07-22 07:04:53
    Orbit # at Epoch 60
    Inclination 0.066
    RA of A. Node 262.111
    Eccentricity 0.0025447
    Argument of Perigee 169.151
    Revs per day 1.00042840
    Period 23h 59m 23s (1439.38 min)
    Semi-major axis 42 229 km
    Perigee x Apogee 35 743 x 35 958 km
    BStar (drag term) 0.000000000 1/ER
    Mean anomaly 266.313
    Propagation model SDP4
    Element number / age 999 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group N/A


    1DIRECTV15
    Lon 68.5015° W
    Lat 0.0460° S
    Alt (km) 35 858.570
    Azm 138.7°
    Elv 43.4°
    RA 11h 17m 56s
    Decl -5° 13' 57"
    Range (km) 37 594.378
    RRt (km/s) 0.007
    Vel (km/s) 3.072
    Direction Descending
    Eclipse No
    MA (phase) 94.4° (67)
    TA 94.7°
    Orbit # 61
    Mag (illum) ? (16%)
    Constellation Leo
     
  10. inkahauts

    inkahauts Well-Known Member

    25,187
    1,606
    Nov 13, 2006
    That assumes it doesn't speed up even more...
     
  11. Ken984

    Ken984 Active Member

    1,155
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    Dec 31, 2005
    Bossier...
    Well it appears that they have slowed the drift considerably. New TLE is out. Inclination is down quite a bit from the last TLE so maybe they are working on that now.

    Basically with this TLE it would be next year before it got to 103.

    Name DIRECTV 15
    NORAD # 40663
    COSPAR designator 2015-026-A
    Epoch (UTC) 2015-07-22 23:58:32
    Orbit # at Epoch 60
    Inclination 0.031
    RA of A. Node 235.058
    Eccentricity 0.0001416
    Argument of Perigee 295.967
    Revs per day 1.00263652
    Period 23h 56m 12s (1436.20 min)
    Semi-major axis 42 167 km
    Perigee x Apogee 35 783 x 35 795 km
    BStar (drag term) 0.000100000 1/ER
    Mean anomaly 62.134
    Propagation model SDP4
    Element number / age 999 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group Geostationary
     
  12. HoTat2

    HoTat2 Hall Of Fame

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    Los...
    No need to wonder about it any longer. DIRECTV just did for up until Aug. 31st.

    http://licensing.fcc.gov/cgi-bin/ws.exe/prod/ib/forms/reports/swr031b.hts?q_set=V_SITE_ANTENNA_FREQ.file_numberC/File+Number/%3D/SATMOD2015072200052&prepare=&column=V_SITE_ANTENNA_FREQ.file_numberC/File+Number

    They also state in the request doc. a date of Aug. 26th as the estimated arrival time at a drift rate of ~1 degree/day
     
  13. slice1900

    slice1900 Well-Known Member

    11,087
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    Wonder why they're making the move so slowly? I'm sure there's a reason behind it, but I have no idea what it is.
     
  14. cforrest

    cforrest Icon

    843
    2
    Jan 20, 2007
    Long Island, NY
    Conserve as much propulsion fuel perhaps. Otherwise it makes no sense to move it so slowly off the top of my head.
     
  15. inkahauts

    inkahauts Well-Known Member

    25,187
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    I question just how accurate all these games are sometimes. Have seen they are not always good and sometimes out of order...
     
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  16. slice1900

    slice1900 Well-Known Member

    11,087
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    Iowa
    The original plan before launch had it reaching 103 already. They completed testing late, about 10 days ago, and won't reach 103 until the 29th which is 37 days from now with a 26 day drift - so 11 days of doing not much. Something changed after launch that caused them to delay. I doubt a slower move saves all that much fuel, but if it does that would mean something happened that caused them to waste/lose fuel.
     
  17. inkahauts

    inkahauts Well-Known Member

    25,187
    1,606
    Nov 13, 2006
    I wonder if they had the same team testing this Sat that was doing the migration of all the locals and such on the d14 and that's why it took longer, since d14 got a late start after having to help out with d10 problems.
     
  18. doctor j

    doctor j Hall Of Fame DBSTalk Club

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    New TLE still has it at 66.9 w/o much movement
    ? more testing??
    Doctor j
     
  19. Ken984

    Ken984 Active Member

    1,155
    11
    Dec 31, 2005
    Bossier...
    New TLE
    Should be at 103 by August 25.


    Name DIRECTV 15
    NORAD # 40663
    COSPAR designator 2015-026-A
    Epoch (UTC) 2015-07-23 16:48:00
    Orbit # at Epoch 62
    Inclination 0.060
    RA of A. Node 261.520
    Eccentricity 0.0002538
    Argument of Perigee 156.826
    Revs per day 0.99995994
    Period 24h 00m 03s (1440.5 min)
    Semi-major axis 42 242 km
    Perigee x Apogee 35 853 x 35 875 km
    BStar (drag term) 0.000000000 1/ER
    Mean anomaly 64.727
    Propagation model SDP4
    Element number / age 999 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group Geostationary


    1DIRECTV 15
    Lon 70.4340° W
    Lat 0.0059° S
    Alt (km) 35 873.180
    Azm 141.2°
    Elv 44.6°
    RA 17h 53m 45s
    Decl -5° 11' 52"
    Range (km) 37 522.107
    RRt (km/s) -0.001
    Vel (km/s) 3.071
    Direction Ascending
    Eclipse No
    MA (phase) 206.8° (147)
    TA 206.8°
    Orbit # 62
    Mag (illum) ? (87%)
    Constellation Oph
     
  20. HoTat2

    HoTat2 Hall Of Fame

    8,057
    318
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    Los...
    If so, now it's on schedule with the latest DIRECTV estimate of Aug. 26 for the migration given in the recent RB-2 milestone extension request.

    Sent from my SGH-M819N using Tapatalk
     

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