Ten Years of Weather and Observing Statistics in San Pedro Martir, Baja California, Mexico

Details Ten Years of Weather and Observing Statistics in San Pedro Martir, Baja California, Mexico Ten Years of Weather and Observing Statistics in San Pedro Martir, Baja California, Mexico

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992rmxaa..24..179t&link_type=abstract

Revista Mexicana de Astronomia y Astrofisica, 24, 179

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Scientific paper

RESUMEN Se presentan estadfsticas del uso del telescopio de 2.1 -m del Observatorio Astron6mico Nacional en San Pedro Martir, Baja California, Mexico. Tambien se incluyen parametros climaticos basicos como la temperatura y humedad relativa al nivel del telescopio. La fracci6n de noches perdidas debido a mal clima fue de 27.4% en el periodo julio 1982 ajunio 1992. De enero 1984 a diciembre 1991, el 56.7% de las noches fueron "fotomericas;" mientras que el 80.4% de las noches ftieron "espectrosc6picas". La humedad relativa promedio fue de 54%. La mejor epoca, en termino de noches despejadas y baja humedad, es en primavera y otono, ya que en el invierno se tiene la influencia de las colas de algunas tormentas del Pacffico norte, mientras que tormentas locales afectan algunas noches de vera no. El porcentaje total de noches nubladas en San Pedro Martir es similar al de Cerro Tololo y La Silla, un poco mejor que en Mauna Kea y considerablemente mejor que en Mount Graham, especialmente en vera no. ABSTRACT Ten year statistics are presented of the use of the 2.1 -m telescope of the Observatorio Astron6mico Nacional at San Pedro Martir, Baja California, Mexico. Also included are some basic climatic and meteorological parameters such as temperature and relative humidity as well as the amount of cloud cover. The fraction of nights lost due to bad weather was 27.4% in the period July 1982 to June 1992. From January 1984 to December 1991,56.7% of the nights were of "photometric" quality and 80.4% were of"spectroscopic" quality The average relative humidity near the ground was 54%. Spring and autumn are the best seasons in terms of cloudless and low humidity nights while winter is affected by the tails of North Pacific storms and mid summer is characterized by a mild monsoon season. The total cloud cover percentage in San Pedro Martir is similar to that of Cerro Tololo and La Silla, slightly better than Mauna Kea and considerably better that 1ount Graham, especially in summen Key : OBSERVATORIES

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