Re: OTV Changed its inclination???

From: Robert Holdsworth (
Date: Thu May 24 2012 - 20:09:15 UTC

  • Next message: Sayyed Hamid Reza Ahmadi: "(no subject)"

    Observed this morning in good conditions.
    I estimated culmination this morning our time at 18:21.32 UTC which would appear to correspond well with an inclination of or about 42.7.  Timed with a portable GPS and  estimate is definitely not more than a few seconds out.
    174.948 E
    41.261 S
     From: Chris Jones <>
    Sent: Friday, 25 May 2012 7:38 AM
    Subject: Re: OTV Changed its inclination???
    On Thu, 24 May 2012 14:48:17 -0400 "Ted Molczan" <> wrote:
    > Art Glick asked:
    > > doesn't it take a very large amount of energy to change the
    > > inclination of an object in orbit (as opposed to orbital height)?
    > Not necessarily. It depends on the size of the inclination change and the
    > velocity at the time of the manoeuvre.
    This is very important.  The lower the velocity at the time of maneuver, the
    lower the delta-V to effect a given inclination change.  This is why
    satellites destined for GEO sometimes use super-synchronous transfer orbits
    (those with apogees higher than the synchronous orbit altitude).  It turns
    out to be cheaper (in propellant usage) to do the inclination change at
    high altitude and then lower the orbit to synchronous altitude.
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