# Re: Defining Geostationary Sats

From: Bjoern Gimle (b_gimle@algonet.se)
Date: Fri Jul 07 2000 - 13:43:41 PDT

• Next message: Patrick: "Space Camp Satellite Watching"

```> completed by an AND (e<0.1)... And with an AND ((I<10º) OR (I>170º)), that
will
> be perfect !
>
With MM=1, I>170º would have a 12 h period, ie NOT GEO.

A small QBASIC program shows the frequency of 0.9<MM<1.1 for increasing i,
using an ALLDAT.TLE sorted with QSORT on inclination.

With 17<i<30 there are only 5 GEO out of 229 in alldat.tle

So, my suggestion is i<17 and 0.1>ABS(MM-1.0027)
e<0.1 shouldn't harm, and you might include that check in the
BASIC code below.

incl <    dN(GEO)    dN(H/LEO)       Ntot
1.02       195            1         196
2.04        26            1         223
3.00        32            0         255
4.02        36           15         306
5.00        26           17         349
6.01        32            3         384
7.01        23           46         453
8.02        25           58         536
9.05        18            3         557
10.01        33            1         591
11.07        33            1         625
12.09        14            0         639
13.05        33            1         673
14.02        33            3         709
15.01        37            0         746
16.04        22            3         771
17.08         2            2         776

OPEN "I", #1, "C:\TLE\alldat.tle"   ' after QSORT  /D3\L /+3.9:8
OPEN "O", #2, "CountGEO.txt"
fm\$ = "###.##     #####       ######     #######"
PRINT "incl <    dN(GEO)    dN(H/LEO)       Ntot"
PRINT #2, "incl <    dN(GEO)    dN(H/LEO)       Ntot"
WHILE NOT EOF(1) AND i < 30
LINE INPUT #1, el\$
IF LEFT\$(el\$, 2) = "2 " THEN
i = VAL(MID\$(el\$, 9, 8))
mm = VAL(MID\$(el\$, 53, 10))
IF INT(i) > INT(ip) THEN
PRINT USING fm\$; i; n1; n2; n0
PRINT #2, USING fm\$; i; n1; n2; n0
ip = i
n1 = 0      ' Count GEO in 1-degree incl interval
n2 = 0      ' Count LEO/HEO in 1-degree incl interval
END IF
n0 = 1 + n0     ' Running total, including MM<0.9 (supersynchronous)
IF .9 < mm AND mm < 1.1 THEN n1 = 1 + n1    'GEO
IF mm >= 1.1 THEN n2 = 1 + n2               'LEO, HEO
END IF
WEND

-- b_gimle@algonet.se (home)  http://www.algonet.se/~b_gimle --
-- COSPAR 5919, MALMA,    59.2576 N, 18.6172 E, 23 m         --

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