# Is the analysis of this maneuver correct?

Can someone out there help explain (guide, give examples etc.), or show a solution of, the following textbook problem that I can't manage to solve?

You’ve just completed an analysis of where the Space Shuttle must be when it performs a critical maneuver. You know the shuttle is in a circular prograde orbit and has a position vector of $r0= 6275.396I + 2007.268J +1089.857K$ (vektor)

In 55 minutes, you predict the orbital parameters are $a = 1.0470357$ , $e = 0.000096$, $i= 28.5°$, $M= 278.94688°.$