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*Subject*: RE: [amsat-bb] Re: AO-40: more successful ARCJET operations*From*: "Tom Clark" <tac@xxxxxxxxx>*Date*: Sun, 24 Jun 2001 18:08:22 -0400*In-reply-to*: <3B3604D4.322A@jamsat.or.jp>

Mineo -- Nice work. The perigee difference is probably due to your definition of altitude, i.e. distance from the surface of the earth. You said: > (18) r0=a(1-e^2)/(1+e*cos(s)) : Height from the center of the earth > (19) r=r0-6371 : Height from the face of the earth The equatorial radius of the oblate earth is 6378.160 km, larger than the 6371 km you use. Since the inclination is only 5.3 deg, it is appropriate to use the equatorial value. Therefore, using your formulation, I come up with: > The solution of this algorism [posted by JE9PEL] > Before After > Perigee height : 286.0 288.4 ....... +2.4 km > > The report of Peter Guelzow, DB2OS > Before After > Perigee height : 279.754 282.2427 .... +2.5 km The JE9PEL perigee corrected by W3IWI: Before After Perigee height : 278.8 281.3 ....... +2.5 km This agrees to ~1 km with the results that Peter reported. Since the object of the "burn" was to raise perigee (with very little change in apogee), and since a post-burn mean motion is not yet available, I haven't bothered to examine the apogee differences. 73 de Tom, W3IWI ---- Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA. To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

**References**:**Re: AO-40: more successful ARCJET operations***From:*Mineo Wakita

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