Night Sky Brightness and Atmospheric Extinction at Kottamia Observatory Site

Details Night Sky Brightness and Atmospheric Extinction at Kottamia Observatory Site Night Sky Brightness and Atmospheric Extinction at Kottamia Observatory Site

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ap%26ss.262..477n&link_type=abstract

Astrophysics and Space Science, v. 262, Issue 4, p. 477-483 (1998).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Photoelectric measurements have been carried out at Kottamia Observatory site to study night sky brightness and the atmospheric extinction at different wavelengths. The results show that the mean extinction coefficients are k = 0.41, k = 0.28< and k = 0.17 mag/air mass during autumn season. These values are almost the same as that obtained by Mikhail (1979) at the same site during the same season. Results of night sky brightness at different altitudes above the horizon have been obtained. Complete scan each five degrees step in azimuth have been done at altitudes 50°, 60° and 70° to complete the previous measurements given by Nawar et al. (1995). Far from the diffuse galactic light, slight variations in night sky brightness with azimuth have been detected.

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