Esa Uses Soviet Data in Comet Mission
San Francisco—Comet Halley ephemeris data obtained from the USSR Venus-Halley (Vega) probes will help the European Space Agency fine-tune the Giotto spacecraft’s close encounter with Halley on Mar. 13, 1986. ESA wants Giotto to intercept Halley’s orbit at 500-1,000 km. (310-621 mi.) from the comet’s nucleus on the comet’s sunward side (AW&ST Feb. 16, 1981, p. 101).
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