Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ap%26ss.262..485n&link_type=abstract
Astrophysics and Space Science, v. 262, Issue 4, p. 485-496 (1998).
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
Photoelectric observations of night sky brightness at different zenith distances in blue, yellow and red colours have been carried out at Abu-Simbel site. Variations in the night sky brightness and (B-V) colour index with time are detected. These variations have been explained by the change of the galactic latitude of the observed point with time. The deduced results of night sky brightness have been compared with that obtained before at other sites. It has been found for both blue and yellow colours, that Abu-Simbel is the darkest site especially for zenith distances equal or greater than 60°. The present values of night sky brightness and colour have been obtained for the first time at Abu-Simbel site. The average night sky brightness at the galactic plane is 22.58 mag/arc sec2 for blue and 21.66 mag/arc sec2 for yellow.
Morcos A. B.
Nawar S.
Sidky Mikhail Joseph
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