Copyright 2000, P. Cinzano, Thiene, Italy
All rights reserved
INVITATION TO A MEASUREMENT CAMPAIGN OF ARTIFICIAL SKY BRIGHTNESS IN THE WORLD
A project devoted to amateur astronomers
We invite advanced amateurs astronomers to collaborate with us to a scientific project which has the aim to collect a large number of measurements of sky brightness in the main astronomical photometrical bands together with extinction data. The project is part of scientific activities of the International Dark-Sky Association – Italian section and is already started in this country.
Many studies of light
pollution and artificial sky brightness require large quantities of measurements
of sky brightness that, in order to be useful, need to be associated to the
knowledge of the atmospheric conditions during the measurements. The vertical
extinction is one of the parameters most easy to measure which allow to evaluate
the aerosol content of the atmosphere.
We propose to advanced
amateur which can have at their disposal a CCD device mounted on a small
telescope and one, or more, standard U, B, V, R filters to participate to our
group of study making accurate measurements of sky brightness together with
extinction in a large number of clean nights and, if their instruments are
transportable, in many different sites. This will allows to obtain for each site
the relation between atmospheric conditions and sky brightness. Measurements
require registration of date, time, sky position in both celestial and
altazimuthal coordinates. Could be useful if measurements will not be limited to
zenith but will cover the intere emisphere with one of the common sampling
Few experienced people who
already made this kind of measurements will be happy to discuss the techniques
to use and the results with who is willing to collaborate, so that results will
be obtained with the same technique by all observers. We would like to create
small sub-groups, each one with an experienced person who can give support and
suggestions to the others, and discuss with them.
We plan to publish results in a professional journal with a paper at which all active observers will take part as authors, if resulting measurements will have an adequate level and will be in a sufficiently large number.
Dr. Pierantonio Cinzano
Dipartimento di Astronomia -- Università di Padova – Italy
Dr. Fabio Falchi