CAOSP abstracts, Volume: 33, No.: 1, year: 2003
- Author(s): Mikulášek, Z.; Svoreň, J.; Žižňovský, J.
- Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 33, no. 1, p. 21-28.
- Date: 02/2003
- Title: Atmospheric extinction at the Brno and Skalnaté Pleso observatories. III. A model of Skalnaté Pleso extinction derived from IHW/IAU medium-band photometrical observations of comets in 1985-90
- Keyword(s): atmospheric extinction, Skalnaté Pleso Observatory, IHW/IAU photometric system
- Pages: 21 -- 28
Abstract:
75 measurements of atmospheric extinction obtained during observations of
bright comets 1P/Halley in 1985/1986, 23P/Brorsen-Metcalf in 1989 and C/1989 X1
(Austin) in 1990 in the IHW/IAU six-colour intermediate band photometric
system at the Skalnaté Pleso Observatory confirmed validity of the
two-component model of atmospheric extinction published in Paper II. That is a
superposition of a more or less constant component of Rayleigh scattering on
temporary clumps of molecules of air and a heavily variable component of
scattering on dust particles (aerosols). The found value of a spectral
parameter α of the dust component of atmospheric extinction,
α=1.01±0.28, suggests that the scattering centres are tiny
dielectric dust particles. The results of IHW/IAU extinction study have been
compared with the results of UBV extinction coefficients gained mostly as a
by-product of the photoelectric photometry of variable stars (407 nights in the
period from 1962 to 1995).
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