DIRECTV Satellite Discussion DLA-1 @95W

Discussion in 'DIRECTV General Discussion' started by egakagoc2xi, Aug 18, 2014.

  1. Oct 21, 2014 #81 of 214
    doctor j

    doctor j Hall Of Fame DBSTalk Club

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    Movement!
    TLE 9 shows almost cicular orbir.
    .3 degree inclination
    Eccentricity .097
    Located at 121 Longitude
     

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  2. Oct 21, 2014 #82 of 214
    HoTat2

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    Wow, was up all morning constantly checking celestrak for updates all to no avail;

    Then just as I need to take a break away from the PC for the restroom and to make a cup of joe, the TLE for 2014-062A updates. lol

    2014-062A
    1 40271U 14062A 14293.90231368 -.00000109 00000-0 00000+0 0 90
    2 40271 0.3071 193.6032 0970352 162.1854 190.3627 1.15194671 85


    Wonder why TLEs 7 and 8 were not posted?

    Anyhow, looks like the orbit raising may indeed reach GEO in about the 8 days as stated in the article. Though it does need to be moved over to 132 degrees west for IOT as stated in the filed STA.
     
  3. Oct 21, 2014 #83 of 214
    doctor j

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    Also, just now Space-Track. org has labeled 2014-062A as Intelsat 30

    Doctor j
     
  4. Oct 21, 2014 #84 of 214
    doctor j

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    TLE 7 and 8

    Sat B,C,D

    0 ARSAT 1_7
    1 40272U 14062B

    0 ARIANE 5 R/B_5
    1 40273U 14063C

    0 ARIANE 5 DEB (SYLDA)_5
    1 40274U 14062D

    Doctor j
     

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  5. Oct 21, 2014 #85 of 214
    HoTat2

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    New TLE;

    INTELSAT 30 (IS-30)
    1 40271U 14062A 14294.32139309 -.00000100 00000-0 00000+0 0 102
    2 40271 0.1688 194.7888 0325418 150.1927 359.0835 1.05029782 98

    Orbit becoming even more equatorial, circular, and geostationay with inclination down to .1688 degrees, eccentricity to .0325, and mean revolution down to 1.050 revs/day
     
  6. Oct 22, 2014 #86 of 214
    HoTat2

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    New TLE #11;

    Not much change than previous.

    INTELSAT 30 (IS-30)

    1 40271U 14062A 14295.22591506 -.00000129 00000-0 00000+0 0 115
    2 40271 0.1684 194.6173 0324296 150.4660 341.0606 1.05049042 98


    [SIZE=14.3999996185303px]Continuing toward GEO target of 35,786 km at 132[/SIZE]° [SIZE=14.3999996185303px]W.L. (for IOT) with approx. equal apogee/perigee of course.[/SIZE]
     
  7. Oct 22, 2014 #87 of 214
    harsh

    harsh Beware the Attack Basset

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    The Linux visualization program I'm using, GNOME Predict, places DLA-1 at -136W and about 570Km below the Clarke Belt so it should still be moving a bit.
     
  8. Oct 22, 2014 #88 of 214
    doctor j

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    At 136 W longitude with sl eastward movement as circularization is nearing completion.
    eccentricity down to .0324
    inclination .168
    Apogee x Perigee = 35824 vs 33173 KM

    Doctor j
     

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  9. Oct 23, 2014 #89 of 214
    HoTat2

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    New TLE #12

    INTELSAT 30 (IS-30)
    1 40271U 14062A 14295.75408249 -.00000145 00000-0 00000+0 0 123
    2 40271 0.1714 192.7057 0325056 152.4523 180.7148 1.05043707 100

    No changes of significance, though for some reason inclination and eccentricity read a tad higher.

    Apogee x perigee by the http://www.satellite-calculations.com/TLETracker/SatTracker.htm site reads from 35828 km x 33171 km.

    Though I suppose I need to find a new satellite tracker program as this one extrapolating from the epoch of this TLE reads the satellite's current longitude at the time of my post as ~125W. Well past the understood IOT slot of 132W. :confused:
     
  10. Oct 23, 2014 #90 of 214
    James Long

    James Long Ready for Uplink! Staff Member Super Moderator DBSTalk Gold Club DBSTalk Club

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    There is probably an update that we are not seeing yet ... based on the last TLE (12):

    Epoch Wed Oct 22 14:05:52 EDT
    Time elapsed since epoch: 15:34:54 (Calculations done at epoch unless noted)

    Apogee 35828.37 Perigee 33170.86 Gap 2657.51 Average 1286.82 below Nominal

    Satellite Longitude 136.7086 West (at Epoch)
    Satellite Longitude 27.0261 East (at 05:40:47 EDT Thursday using this TLE)
    Target Longitude 132 West +/-0.05
    The satellite reached the target on Wednesday @ 8:56p EDT following the TLE shown.

    Average Driftrate 16.5253 deg/day East
     
  11. Oct 23, 2014 #91 of 214
    harsh

    harsh Beware the Attack Basset

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    That can't be right. Almost three hours later it is at 120W and still moving east.
     
  12. Oct 23, 2014 #92 of 214
    HoTat2

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    Oh ...

    Then maybe the online calculator I used wasn't wrong about the longitude of the satellite being at 125W at the time of my previous post.

    But I don't understand why Intelsat drifted it past the 132W IOT slot? :confused:

    Their 30 day STA for IOT and subsequent drifting over to the operational slot at 95.05W was granted to begin on 10/25 which seem to be right on schedule with the 136W position of the satellite doctor j posted yesterday.
     
  13. Oct 23, 2014 #93 of 214
    harsh

    harsh Beware the Attack Basset

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    I don't get that either, but they may have dropped it into place with a subsequent burn that they haven't released a TLE for yet.
     
  14. Oct 23, 2014 #94 of 214
    HoTat2

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    After some more thought, this is my thinking as well (just wish my mind weren't slowing down these days :) ).

    As James said there must be a or some missing TLE(s) probably showing a stop at 132W in GEO now, And the satellite calculation programs are merely continuing to extrapolate where the satellite would have been had the orbital parameters of the last TLE (i.e. #12) not changed.
     
  15. Oct 23, 2014 #95 of 214
    bakers12

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    As I recall, when a satellite is nearing its destination, there is a series of small adjustments and TLEs aren't released for these changes. When the satellite is stabilized, we'll get another TLE.
     
  16. Oct 23, 2014 #96 of 214
    doctor j

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    TLE 13
    Almost parked
    Doctor j
     

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  17. Oct 23, 2014 #97 of 214
    doctor j

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    10 INTELSAT 30_13
    Lon 132.3246° W
    Lat 0.0730° N
    Alt (km) 35 463.670
    Azm 241.6°
    Elv 28.1°
    RA 20h 34m 17s
    Decl -5° 07' 29"
    Range (km) 38 456.159
    RRt (km/s) -0.009
    Vel (km/s) 3.093
    Direction Ascending
    Eclipse No
    MA (phase) 342.1° (242)
    TA 341.9°
    Orbit # 12
    Name 0 INTELSAT 30_13
    NORAD # 40271
    COSPAR designator 2014-062-A
    Epoch (UTC) 2014-10-23 18:11:41
    Orbit # at Epoch 11
    Inclination 0.072
    RA of A. Node 267.862
    Eccentricity 0.0045091
    Argument of Perigee 64.494
    Revs per day 1.00783761
    Period 23h 48m 48s (1428.80 min)
    Semi-major axis 42 022 km
    Perigee x Apogee 35 454 x 35 833 km
    BStar (drag term) 0.000000000 1/ER
    Mean anomaly 197.964
    Propagation model SDP4
    Element number / age 13 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group N/A
     
  18. Oct 23, 2014 #98 of 214
    LameLefty

    LameLefty I used to be a rocket scientist

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    Yep.

    TLEs are released publicly for informational/educational purpose, not because we have some inherent right to know. I say that to remind folks not to get too stressed, worried or unduly concerned when there's a gap in a new elset or if the satellite seems (*) to be doing something that it shouldn't (i.e., overshooting or undershooting its target longitude).

    To understand gaps or delays in releasing updated data, it helps to know how the element sets are created in the first place. The data released by Space-Trak can be derived from direct observation (optical, IR, radio Doppler or radar), tracking data provided by the satellite operator themselves based on inertial measurement, stellar observation, or 3D GPS measurements all made on-board the spacecraft and returned by telemetry, or some combination. Sometimes, there are delays between one type of observation and another, or errors in between the two which must be interpolated or otherwise harmonized/corrected for, and sometimes there are simply times when data cannot be collected in a timely manner because tracking assets have higher-priority targets to track and update.

    (*) Based on projections from an outdated element set, as shown by consumer/hobbyist amateur tracking software.
     
  19. Oct 23, 2014 #99 of 214
    James Long

    James Long Ready for Uplink! Staff Member Super Moderator DBSTalk Gold Club DBSTalk Club

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    The older the TLE the less reliable it is for predicting current location. The only location given is for the epoch ... the time stated for the TLE. The further one gets away from the epoch the less one can trust any prediction - especially during launch and initial positioning of the satellite.

    TLE 13 doesn't show a stop ... but it certainly slowed down its movement. Based on TLE 13, the satellite will reach the target on Saturday @ 2:18a EDT. But there will certainly be more TLEs released before the satellite "stops" at 132.
     
  20. doctor j

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    TLE 14
    Still a bit of movement by simulation tracking but CLOSE:

    Name 0 INTELSAT 30_14
    NORAD # 40271
    COSPAR designator 2014-062-A
    Epoch (UTC) 2014-10-24 05:21:54
    Orbit # at Epoch 11
    Inclination 0.068
    RA of A. Node 260.653
    Eccentricity 0.0046112
    Argument of Perigee 71.408
    Revs per day 1.00798373
    Period 23h 48m 35s (1428.58 min)
    Semi-major axis 42 018 km
    Perigee x Apogee 35 446 x 35 833 km
    BStar (drag term) 0.000000000 1/ER
    Mean anomaly 7.162
    Propagation model SDP4
    Element number / age 14 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group N/A

    10 INTELSAT 30_14
    Lon 132.7922° W
    Lat 0.0224° S
    Alt (km) 35 725.210
    Azm 243.8°
    Elv 25.7°
    RA 05h 32m 54s
    Decl -5° 11' 31"
    Range (km) 38 943.541
    RRt (km/s) 0.013
    Vel (km/s) 3.074
    Direction Descending
    Eclipse No
    MA (phase) 116.6° (83)
    TA 117.1°
    Orbit # 11

    Doctor j
     

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