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    No.41 - Preparing for Ion Drive Firing

    22 Jul 2005 11:36

    Overall Status

    During the period 20 June to 17 July 2005, SMART-1 ground activities focused on planning and preparing for the upcoming firing of the ion drive.

    It is planned to exhaust all the Xenon available in the tank going beyond the design limit of 2 kg. This has required special simulations and the development of new procedures.

    The EP planned activities are summarised below:

    Thrust Starts 2 August 10:21
    Thrust Ends 14 September 18:29
    Interuptions
    (to avoid double stracker blindings)
    7 August 13:32 - 11 August 02:28
    21 August 19:34 - 25 August 03:32
    6 September 07:21 - 10 September 01:14
    Orbit 207 revolutions of about 5 hours each
    Coast at Perilune 49 minutes
    Coast at Apolune 112 minutes
    Thrust on Ascending Arc 68 minutes (true anomaly 62° and 144°)
    Thrust on Descending Arc 68 minutes (true anomaly -144° and -62°)
    Perilune Height
    At Start: 430 km
    20 August: 411 km
    At End: 462 km
    Apolune Height
    At Start: 2889 km
    20 August: 2918 km
    At End: 2866 km
    Xenon
    At Start 6.05 kg
    At End 0.565 kg
    Useage 5.485 kg

    The moon eclipse period starts on 19 October and ends on 22 December. By then the thrust spiral must be terminated, as the EP cannot be operated during this period.

    Future Activities

    In the coming weeks mission activities will be focused in a number of areas including:

    • Finalisation of the preparation and start of the EP orbit Re-boost in August
    • Start work for next phase of ground automation activities.

    Spacecraft Status

    The spacecraft status is good with all functions working nominally.

    Orbital Information

    SMART-1 OD335 – Close to Apolune 912
    Epoch (UTC) 2005/07/18 11:14:28.0

    Elements WRT Moon and its equator of date
    Pericentre Distance (km) 2204.644615
    Apocentre Distance (km) 4600.376088
    Semi Major Axis (km) 3402.510352
    Eccentricity 0.352054
    Inclination (°) 90.263741
    Ascending Node (°) 237.447509
    Argument of Pericentre (°) 247.553315
    True Anomaly (°) 180.023828
    Osculating Orbital Period (h) 4.947143

    The changes since apolune 878 are as follows:

    • Semi-major axis: -0.3 km
    • Perilune height: -24.8 km
    • Apolune height: +24.1 km
    • Orbital period: -0.0 min


    Last Update: 09 Nov 2005

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