Rapid Changes in Comet Halley's CO+ Tail

Details Rapid Changes in Comet Halley's CO+ Tail Rapid Changes in Comet Halley's CO+ Tail

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986msngr..43....6.&link_type=abstract

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

Physics

Scientific paper

Regular observations of Comet Halley were undertaken at the European Southern Observatory at La Silla from mid-February 1986. However, since the comet was seen in a moon-Iit sky in the period 23 February - 8 March, special measures had to be taken to suppress the adverse influence of the bright background. Therefore, observations with the Wide-Field CCD Camera were made through narrow optical filters centred at wavelengths near the spectral emissions of the major constituents in the gaseous tail(s). The picture shows two such exposures made on 3 and 4 March through a 7 nm wide filter near 426 nm in violet light which record emission from carbon monoxide ions (CO+). In order to show the full extent of the tail, each picture consists of two 40-minute exposures. Pixels are indicated along the edges; each pixel measures 31 arcseconds. The distance from the comet to the sun was 114 million kilometres and the comet was 182 million kilometres from the earth. The length of the eo+ tail is more than 15 degrees or 50 million kilometres.

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