[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

*Subject*: [amsat-bb] drafting sputnik-1 tle*From*: andy thomas <andythomasmail@xxxxxxxxxxx>*Date*: Sun, 23 Sep 2007 10:46:46 +0100 (BST)

Looking at my previous posting I can see that the RAE data is different from the data on the SEESAT site as I am trying to put it into tle format. As suggested, it'll be great to run it as a simulation using contemporary keps exactly 50 years old. I remember some years ago writing a simple prediction program using some of the TLE data and getting a print out from NASA identifying the elements in the two line set, and now I see it's reproduced on the amsat'org website. But I do not know how to calculate the RAAN, the Mean Anomolay and the Checksum, and I make an assumption of zero drag. So far I have: SPUTNIK-1 1 000001U 57 1 A 57277.8 .CCCCCCCC 000000-0 000000-0 0 Z 2 00000165.1000 III.IIII 052000 58.000 MMMM.MMMM 14.92723492 Z The bits I don'tknow how to calculate are: .CCCCCCCC this is the drag factor - can it just be set to zero initially? III.IIII this is the infamous RAAN - I gather it is calulated from the Mean Motion and a reference time but don't know any more MMM.MMMM this is the Mean anomoly and again I wonder if it can't just be set to zero at least at first? Finally Z which is line checsksum - I don't easily understand the definition "the sum of all integer characters on a line plus a 1 for each negaitve sign - it's the modulo-10 of the sume ofthedigits and negative signs" (I might get there and will try when I've done the rest). Would appreciate it if amsatters who are better mathematicians than I am, could conclude the TLE, then I plan to use STS+ in time simulation mode to run it. 73 de andy G0SFJ ___________________________________________________________ Want ideas for reducing your carbon footprint? Visit Yahoo! For Good http://uk.promotions.yahoo.com/forgood/environment.html _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

- Prev by Date:
**Re: New Preamp** - Next by Date:
**Re: New Preamp** - Prev by thread:
**FW: ATF-54143 preamp for 70cm** - Next by thread:
**K3SZH / AO-7** - Index(es):