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Thread: Satellite D15 Discussion

  1. #1
    Edgecutter
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    Satellite D15 Discussion

    Looks like D15 is on the move.
    David

  2. #2
    Super Moderator Tom Speer's Avatar
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    Quote Originally Posted by dogbreath View Post
    Looks like D15 is on the move.
    Yes, it definitely is! I noticed D15 was a little west of it's station keeping box this morning. It now looks like it is moving more quickly to the west. N2YO shows it at 100.99 and accelerating westward.
    Tom Speer, N2HF, the curious otter. Part of the DataDigesters team.

  3. #3
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    Quote Originally Posted by dogbreath View Post
    Looks like D15 is on the move.
    Know of any TLEs or something to confirm this? ...

    Or just a natural assumption based on the FCC filings stating T15 was to begin moving back on 9/16?

  4. #4
    Senior Member Ken984's Avatar
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    D15 latest TLE

    1 40663U 15026A 19261.35674512 -.00000114 00000-0 00000+0 0 9991
    2 40663 0.0264 126.6547 0003768 63.0735 194.7676 1.00240808 15832
    Name #40663
    NORAD # 40663
    COSPAR designator 2015-026-A
    Epoch (UTC) 2019-09-18 08:33:42
    Orbit # at Epoch 1583
    Inclination 0.026
    RA of A. Node 126.655
    Eccentricity 0.0003768
    Argument of Perigee 63.074
    Revs per day 1.00240808
    Period 23h 56m 32s (1436.53 min)
    Semi-major axis 42 173 km
    Perigee x Apogee 35 779 x 35 811 km
    BStar (drag term) 0.000000000 1/ER
    Mean anomaly 194.768
    Propagation model SDP4
    Element number / age 999 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group N/A

    1#40663
    Lon 100.9913° W
    Lat 0.0182° N
    Alt (km) 35 779.350
    Azm 294.4°
    Elv -25.1°
    RA 11h 22m 17s
    Decl -6° 31' 53"
    Range (km) 44 471.966
    RRt (km/s) -0.001
    Vel (km/s) 3.076
    Direction Ascending
    Eclipse No
    MA (phase) 345.2° (245)
    TA 345.2°
    Orbit # 1 583
    Mag (illum) Not visible
    Constellation Crt

  5. #5
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    Well, ... unless I'm mis-reading something here ...

    As of 9/18, for whatever reason, this TLE indicates no movement yet for T15. ...

  6. #6
    Super Moderator Doctor j's Avatar
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    Quote Originally Posted by HoTat2 View Post
    Well, ... unless I'm mis-reading something here ...

    As of 9/18, for whatever reason, this TLE indicates no movement yet for T15. ...
    Period of 23Hr 56 min and 32 sec is ~ 27 sec slower than geo-stationary thus will slowly move west

    Doctor j

  7. #7
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    One of the other sites that displays TLE info shows the drift too:
    CelesTrak: Active Geosynchronous Satellites

    Enter "DirecTV" in the search box to see it.

  8. #8
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    Quote Originally Posted by Tom Speer View Post
    Yes, it definitely is! I noticed D15 was a little west of it's station keeping box this morning. It now looks like it is moving more quickly to the west. N2YO shows it at 100.99 and accelerating westward.
    Yes, I see now T15 is definitely drifting westward ...

    But I do hope it is indeed "accelerating", since at only the current .1°/day, it's going to take about 20 days at this rate to reach 103W nom. ...

  9. #9
    Super Moderator Tom Speer's Avatar
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    Try this: https://www.n2yo.com/?s=26985|29494|40663|44333|28659

    click on "Fit all satellites on the map". The sats in the map, are D4S, D9S, D15, T16, and D8. Move your pointer over each Satellite, and it will identify it, click on a satellite, and the location information and other orbital parameters will be displayed in the upper right of the screen.
    Last edited by Tom Speer; 09-19-2019 at 12:27 AM.
    Tom Speer, N2HF, the curious otter. Part of the DataDigesters team.

  10. #10
    Super Moderator Tom Speer's Avatar
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    Quote Originally Posted by HoTat2 View Post
    Yes, I see now T15 is definitely drifting westward ...

    But I do hope it is indeed "accelerating", since at only the current .1°/day, it's going to take about 20 days at this rate to reach 103W nom. ...
    It only started moving this morning. Patience.
    Tom Speer, N2HF, the curious otter. Part of the DataDigesters team.

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