Re: Orbital mechanics folks...why does the ISS reboost matter?

On Tue, 05 Dec 2006 18:39:54 -0600, Jorge R. Frank wrote:

"snidely" <Snidely.too@xxxxxxxxx> wrote in news:1165355261.772060.286200
@j72g2000cwa.googlegroups.com:


Craig Fink wrote:
On Sat, 02 Dec 2006 04:37:41 +0000, Jim Oberg wrote:


See http://www.jamesoberg.com/books/spt/new-CHAPTERSw_figs.pdf, the
Appendix 1 to chapter 1,
for generic background, then we can chat.

In Chapter 1, Appendix 1, Figure 3-1 is incorrect. It has several
things wrong with it.

Fig 3-1? Or 1-3?

1-3. The two most obvious problems being:

1) The elliptical orbit ("new path") should be placed so that Earth is
at one of the foci rather than the center, and
2) The delta-V point should be at an intersection between the new path
and the original path.
3) Since burns perpendicular to the velocity vector don't change the
energy of the Orbit, the semi major axis will remain constant. The
Diameter of the Circle should equal the long axis of the Ellipse.
4) orbital intersections are 2) many. 2-D orbits can have zero
intersections, one intersection in a very special case (occurring at
apogee or perigee, ex. Hohmann transfers), and all others will have two
intersections. Three or four is an impossibility. 1) should fix this.
.

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