[IAN] prelet Miru pred Mesicem

[Karel Sandler]

On Thu, 1 Mar 2001, Petr Pravec wrote:

> On Thu, 1 Mar 2001, Karel Sandler wrote:
> 
> > Pro zajemce jsem umistil na http://www.ujf.cas.cz/~sandler/images/63_1.gif
> > velmi narychlo zhotovenou mapku casti drahy "stinu" pro 6.3.2001.
> > 
> > Co se tyka presnosti:
> > 
> > 1. drahove elementy Miru jsou z 27.2.
> > 2. vypocet je zalozen na SkyMapPro7.
> 
> Bere ten vypocet v uvahu plne perturbace te tyden stare drahy (od 27.2.
> do 6.3.) zpusobene asfericnosti Zeme?  Pokud si to jeste dobre pamatuji
> z prednasek o nebeske mechanice, tak se drahy druzic diky teto asfericnosti
> neustale staceji.  Pokud to ten program presne zapocitava, pak je
> to OK.  V opacnem pripade by vsak ten stin mohl jit uplne jinudy.

Mate pravdu, ze zanedbat precesi drahy by vzhledem k jeji hodnote
rychle vedlo ke zcela chybne predpovedi. Z dokumentace ke SkyMapPro7
vytrhuji nasledujici slova autora: (Copyright C.A.Marriott 1992-2000)

"When dealing with NORAD TLEs it's extremely important that satellite
prediction software should follow NORAD's precise method of computing
orbital positions; these standard NORAD "mathematical models ..."

a dale:

"SkyMap uses a rigorous implementation of both the SGP4 and SDP4 orbit
models and produces results which are in exact agreement with the "test
cases" published ..." 

Otazkou ovsem stale zustava presnost predpovedi na tyden dopredu. Odpoved
muze dat prepocteni s novejsimi elementy.


Karel Sandler
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