International Halley Watch: Discipline specialists for photometry and polarimetry

Details International Halley Watch: Discipline specialists for photometry and polarimetry International Halley Watch: Discipline specialists for photometry and polarimetry

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986plas.rept..174a&link_type=abstract

In NASA, Washington Reports of Planetary Astronomy, 1985 p 174 (SEE N87-12407 03-89)

Astronomy and Astrophysics

Astronomy

Astronomical Photometry, Giacobini-Zinner Comet, Halley'S Comet, Polarimetry, Tracking Filters, Charge Coupled Devices, Line Spectra, Radial Velocity, Spectral Emission, Tracking Networks

Scientific paper

The last of the 75 sets of standard filters were distributed, including re-allocation of several sets from north to south at the beginning of 1986. Observations of the photometric standard stars from several observatories were collected and synthesized into a standard system of magnitudes. Transformation equations were derived to yield absolute fluxes in various cometary emission bands and in the continuum. These transformations turned out to vary with the comet's radial velocity for some filters and with the filter's temperature for some filters, and from one set of filters to another, all effects were quantitatively assessed. Non-linearities in the extinction, observed through the OH filter, were modelled and techniques for linearizing the extinction were developed. Although not among the official goals of the IHW, NASA Headquarters chose to work through the IHW to develop two CCD camera systems. Two iterations of an archive format were performed and a third is in the works.

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