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Comrades! Death to the hooligan asteroid!
In article
tatelephone, Pat Flannery wrote: Sylvia Else wrote: "closer than some geo-stationary satellites" ? Geo-stationary satellites operate at varying distances? This could be a screw up with translation, as Russia has used satellites with highly elliptical orbits (Molniya orbits) that also have a 24 hour period. Molniya orbits are 12 hour orbits that are 'approximately geostationary' at apogee, which they achieve at a latitude of ~63.4 degrees. This inclination ( i=acos(sqrt(1/5)) ) cancels out the precession in the argument of perigee (i.e. if the apogee starts out at the Northernmost point in the orbit, it stays there) and is well placed for those far above the decadent temperate latitudes. Tundra orbits are the 24 hour orbits at the same latitude, and are currently used only by Sirius Radio satellites. http://en.wikipedia.org/wiki/Molniya_orbit http://en.wikipedia.org/wiki/Tundra_orbit -- David M. Palmer (formerly @clark.net, @ematic.com) |
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Comrades! Death to the hooligan asteroid!
David M. Palmer wrote:
In article tatelephone, Pat Flannery wrote: Sylvia Else wrote: "closer than some geo-stationary satellites" ? Geo-stationary satellites operate at varying distances? This could be a screw up with translation, as Russia has used satellites with highly elliptical orbits (Molniya orbits) that also have a 24 hour period. Molniya orbits are 12 hour orbits that are 'approximately geostationary' at apogee, which they achieve at a latitude of ~63.4 degrees. This inclination ( i=acos(sqrt(1/5)) ) cancels out the precession in the argument of perigee (i.e. if the apogee starts out at the Northernmost point in the orbit, it stays there) and is well placed for those far above the decadent temperate latitudes. I always thought they were 24 hour period; thanks for the correction. Pat |
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