Observations at La Silla of comet Halley after perihelion.

Details Observations at La Silla of comet Halley after perihelion. Observations at La Silla of comet Halley after perihelion.

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986msngr..43....5w&link_type=abstract

The Messenger, vol. 43, p. 5-6

Astronomy and Astrophysics

Astronomy

Comet 1910 Ii Halley

Scientific paper

Comet Halley passed through its perihelion on 9 February. At that moment it was only 8 degrees from the sun and it could therefore not be observed with optical telescopes. However, radio and infrared observations, which started in late 1985, continued to be made during daytime. The first observations of the comet after perihelion were performed at La Silla on 15 February in the bright morning sky, when Halley still was only 15 degrees from the sun. Here, ESO astronomer R. M. West and Belgian visiting astronomer H. Oebehogne photographed the object with the 40-cm GPO double astrograph, just after it rose above the eastern horizon. A 30-second exposure on a red-sensitive plate, when the comet was only 15 arcminutes above the Cordillera, enabled the astronomers to measure the accurate position. The data were immediately telexed to the spacecraft control centres in Oarmstadt, Tokyo, Moscow and Pasadena as weil as to the lAU Telegram Bureau in Cambridge, Mass., USA. The ESO observation proved that Halley was very near the orbit which had been predicted on the basis of preperihel ion measurements. It was good news for the spacecraft navigators that Halley had behaved normally while "behind" the sun. As we witnessed in early March, all five spacecraft en route to Halley indeed managed to pass the comet nucleus within the prescribed distances.

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