Hello, I'm interested in how to formulate a simple constellation in which there are two satellites with identical orbital parameters (eccentricity <0.003, same inclination and aligned arg. Perigee, same RAAN) but which have different altitudes (e.g. Semi major axis) which are around 1000km and offset by a small amount, say 50km. As the orbits propagate, the arg perigees will precess at different rates. My question is how can I determine delta-v requirements to keep the perigee aligned during orbit evolution (ignoring RAAN precession) and therefore keeping a frozen configuration. Any thoughts welcome.