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*Subject*: Re: [amsat-bb] Osculating element sets and secular effects*From*: "Kenneth J. Ernandes" <n2wwd@xxxxxxxxxxxxxx>*Date*: Fri, 21 Feb 2003 20:23:49 -0500

Joe - "Osculating elements" represent the instantaneous physical orbit at epoch -- they represent a path that is tangent to or "kissing" the physical orbit. The alternative are "mean elements" which are a mathematical tool for accurate orbital predictions, but since they average out certain periodic perturbations, do not exactly represent the orbit physically. BTW, the TLEs we use are "mean" and not "osculating" elements. "Secular" effects have nothing to do with religion but rather are drifts that continuous and indefinite drift to the orbital parameters occurs due to first-order perturbational effects. The next order effects are periodic in nature, both long and short term. Hope this helps. 73, Ken N2WWD ----- Original Message ----- From: "Joseph B. Fitzgerald" <jfitzgerald@alum.WPI.EDU> To: <amsat-bb@AMSAT.Org> Sent: Friday, February 21, 2003 5:01 PM Subject: [amsat-bb] Osculating element sets and secular effects > I have seen the terms "osculating elements" and "secular effects" > mentioned in orbital mechanics texts, but can't for the life of me figure > out how kissing can possibly have anything to do with satellite tracking. > And if there are secular effects, are there also religious effects? > > Where do these terms come from? > > Joe KM1P > > ---- > Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. > Not an AMSAT member? Join now to support the amateur satellite program! > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org ---- Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

**References**:**Osculating element sets and secular effects***From:*Joseph B. Fitzgerald

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