An Updated View of the Light Pollution at the Roque de Los Muchachos Observatory

Details An Updated View of the Light Pollution at the Roque de Los Muchachos Observatory An Updated View of the Light Pollution at the Roque de Los Muchachos Observatory

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ingn....9...28p&link_type=abstract

The Newsletter of the Isaac Newton Group of Telescopes (ING Newsl.), issue no. 9, p. 28-31.

Physics

Light Pollution, Orm, Roque De Los Muchachos Observarory

Scientific paper

The Observatorio del Roque de Los Muchachos (ORM), located at La Palma in the Canary Islands is actually the largest European Observatory in the northern hemisphere. The site benefits from good sky transparency, high fractions of clear (~70%) and photometric nights (~60%) and a mean seeing of 0.76". An inversion layer in the 1300-1700 m height range, guarantees (though with many exceptions in winter) stable observing conditions during 3/4 of the year. The Canary Sky Law, introduced in 1992 put strict limits on the type of lamps which can be used for outdoor lighting, on their power, and on orientation with respect to the ground and implied that, after local midnight, most of the high-pressure sodium (HPS) and mercury lamps must be extinguished, as well as all the discharge-tube illumination. In general, low-pressure sodium lamps should be used except in the urban areas where HPS lamps are admitted and a non-negligible fraction of mercury and incandescent lamps still exist.

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