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*Subject*: [amsat-bb] Re: AO-40: more successful ARCJET operations*From*: Mineo Wakita <je9pel@xxxxxxxxxxxx>*Date*: Mon, 25 Jun 2001 22:24:29 +0900

Thank you, Tom Clark / W3IWI. I confirmed the equatorial radius of the oblate earth is 6378.140 km (6378140 m = 637814000 cm) by a astronomical journal of Japanese. As a result, this perigee height agrees to ~1 km with the results that Peter reported. I corrected as the following (18),(19) and I reposted the EXCEL sheet. http://www.ne.jp/asahi/hamradio/je9pel/a40range.zip (18) r0=a(1-e^2)/(1+e*cos(s)) : Distance from the center of the earth (19) r=r0-637814000 : Distance from the surface of the earth The solution of this algorithm, the correction of W3IWI and JE9PEL : Before After Perigee height : 278.8 281.3 ....... +2.5 km Apogee height : 58960.0 58959.7 ....... -0.3 km The report of Peter Guelzow, DB2OS : Before After Perigee height : 279.754 282.2427 .... +2.5 km Apogee height : 58971.166 58971.024 .... -0.1 km Tom Clark / W3IWI, wrote: > 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 algorithm [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. ---------------------------------------------- Name : JE9PEL/Mineo Wakita, JAMSAT member Mail : je9pel@jamsat.or.jp URL : http://www.ne.jp/asahi/hamradio/je9pel/ QTH : Yokohama Japan, GL:PM95TJ Date : Jun 25, 2001 ---------------------------------------------- ---- Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA. To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

**Follow-Ups**:**Re: Re: AO-40: more successful ARCJET operations***From:*Phil Karn

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