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AMC-14 failed to reach the planned orbit

Discussion in 'General DISH™ Discussion' started by P Smith, Mar 15, 2008.

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  1. Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    DIRECTV 12 is tentatively expected to launch near the end of 2009, but no announcements have been made as to which launcher nor which orbital slot.

    Cheers,
    Tom
     
  2. HobbyTalk

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    I thought I had read that someplace, I may be mistaken.
     
  3. Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    I wonder if you saw the report that DIRECTV has an option on one of the launchers for a future launch? DIRECTV does have another option to luanch with Sealaunch "in the future". :)

    Cheers,
    Tom
     
  4. ext1sxb

    ext1sxb Cool Member

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    AMC-14 is ‘de-orbiting’ right now!
    Check this: n2yo.com/?s=32709 – life satellites tracking.
    The altitude is lowering dramatically!:(
     
  5. ziltomil

    ziltomil AllStar

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    Those are the days when the moon is positioned 45 degrees from the place AMC14 would have to meet it in order to correct its inclination and save fuel.
     
  6. ext1sxb

    ext1sxb Cool Member

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    May be I am wrong (I hope!).
    :confused: They are performing some maneuvers and moving satellite to the eclipsed orbit.
     
  7. dms1

    dms1 Legend

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    No it isn't (de-orbiting that is). Will people please read up the basics of Kepler's laws.
     
  8. dms1

    dms1 Legend

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    Given the lack of heavy lift capabilities it would be suicidal if every satellite operator didn't have options with more than one launch service. If you commit to a single service and they suspend operations for an extended period for whatever reason (as Sea Launch had to last year) then the last thing you want is to join the end of a long wait list for another service.
     
  9. James Long

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

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    Or ... nicely put ... please go back in this thread and read what was posted about eliptical orbits.

    http://www.dbstalk.com/showthread.php?p=1510699

    It seems every time that AMC-14 comes close to earth someone predicts that it is crashing ... only to not notice that it follows the rest of the elipse later in the day.
     
  10. dms1

    dms1 Legend

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    Even if they were performing a maneuver you wouldn't be able to see it from the n2yo.com "tracking" data in anything close to real time. I'm pretty certain this supposed tracking data is just an orbital simulation based on the most recently listed TLE for the satellite.
     
  11. bartendress

    bartendress Godfather

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    Welcome to DBStalk.com!

    What you are seeing is the satellite's altitude dropping into it's orbit perigee. A bit later you'll see it's ascent to about 16.5-17K miles as it reaches apogee. It's orbit is elliptical right now. I'm not sure of it's orbital period. You'll note that at apogee it will become geostationary relative to it's position at that time. It's an incomplete transfer orbit due to the anomaly within that stage of the launch.
     
  12. James Long

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

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    True

    Their latest TLE is
    1 32709U 08011B 08079.63845251 -.00000129 00000-0 00000+0 0 82
    2 32709 049.2041 169.9937 6423314 356.9988 062.9436 03.07215499 121

    The one I copied on March 20th was
    1 32709U 08011B 08079.63845251 -.00000129 00000-0 00000+0 0 82
    2 32709 049.2041 169.9937 6423314 356.9988 062.9436 03.07215499 121

    n2yo has been estimating the location of the satellite since "08079.63845251".
    (March 21 03:19:22.1 UTC ???)
    At that point in time the satellite orbit could be described as
    Code:
    Element Set Epoch                           08079.63845251
    1st Derivative of the Mean Motion               -.00000129
    with respect to Time
    2nd Derivative of the Mean Motion                 00000-0
    with respect to Time (decimal point assumed)
    B* Drag Term                                      00000+0
    Element Set Type                                0
    Element Number                                 82
    
    Orbit Inclination (degrees)                   049.2041
    Right Ascension of Ascending Node (degrees)   169.9937
    Eccentricity (decimal point assumed)              6423314
    Argument of Perigee (degrees)                 356.9988
    Mean Anomaly (degrees)                        062.9436
    Mean Motion (revolutions/day)                  03.07215499
    Revolution Number at Epoch                    121
     
  13. HobbyTalk

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    Wait a bit, it will be going back up :lol:
     
  14. cartrivision

    cartrivision Hall Of Fame

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    I believe that 08079.xxxxxxx means the 79th day of 2008 which would be March 19.
     
  15. James Long

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

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    Still a few days old. I used a Navy calculator to convert the number.
    Is January 1st "08000.xxxxxx" or "08001.xxxxxx" ?

    BTW: It would be March 20 15:19:22.1 UTC if 08000.0 was midnight (2454466.50000 JD).
     
  16. cartrivision

    cartrivision Hall Of Fame

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    That sounds right. Assuming that the day starts counting from 0, day 0 would be Jan 1st, not Jan 0th.

    EDIT: except that this web site (http://www.castor2.ca/03_Astronomy/03_TLE/Epoch.html) says that the days start numbering with 1, so it is March 19.
     
  17. dahenny

    dahenny Legend

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  18. bartendress

    bartendress Godfather

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  19. dahenny

    dahenny Legend

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    There is an "object A" too, but, as SmithP suggests, it may be the remains of the Briz-M rocket. The key is in the NORAD ID...32709 for AMC14, and 32708 for "object A".
     
  20. James Long

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

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