RE: ICO F2 & Atlas Centaur RB

From: Phillip Clark (
Date: Tue Jun 19 2001 - 10:09:21 PDT

  • Next message: Vitek, Antonin: "Re: ICO F2 & Atlas Centaur RB"

    On Tue, 19 Jun 2001, Harro Zimmer wrote:
    > But: ICO F2 itself as a single object was not in the transfer orbit. The 
    > separation from the Centaur cames at 01:53:43 MET in the final orbit
    > ( MM 4.10...) about 3 minutes after MECO 2.
    You have a parallel situation with the launches of satellites aboard the
    four-stage Proton-K.   The transfer orbit of the fourth stage + payload
    usually appears under the international designator of the
    _payload_.   Check out Astra 2C.   The fourth stage only appears under its
    own designator once it has separated from the satellite.
    We can argue forever whether the transfer orbits should be assigned to the
    payload or the final stage rocket, but USSPACECOM seems to have made the
    decision that such orbits should appear under the payload's ID and
    catalogue number.
    Also, the orbit of the Centaur is slightly below that of ICO 2.   Looking
    back at the data supplied for the planned ICO 1 launch profile last year,
    after separating from the satellite the Blok DM-SL was planned to do a
    burn to depletion to bring the orbit _below_ the deployment orbit for the
    satellite.   We see the same thing with the Centaur on the ICO 2 mission.
    Phillip Clark
    Phillip S Clark                                     22 Winterbourne Close
    Molniya Space Consultancy                           Hastings
    Compiler/Publisher, Worldwide Satellite Launches    E Sussex  TN34 1XG
    Specialist in "space archeology" - the older and more obscure the more 
    interesting it is !
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