We present the main characteristics of the Pico del Buitre , at the Sierra de Javalambre , the proposed location for the Javalambre Astrophysical Observatory .
The measurements have been obtained from spectrophotometric , photometric and seeing data obtained with different monitors and instruments on the site .
We have also used publicly accessible meteorological satellite data to determine the total time useful for observations .

The night-sky optical spectrum observed in a moonless night shows very little contamination by the typical pollution lines .
Their contribution to the sky-brightness is \sim 0.06 mag in B , \sim 0.09 mag in V and \sim 0.06 mag in R. In particular , the comparison of the strengths of the Sodium artificial and natural lines indicates that the site satisfies the IAU recommendations for a dark site .
The zenith-corrected values of the moonless night-sky surface brightness are B = 22.8 mag arcsec ^ { -2 } , V = 22.1 mag arcsec ^ { -2 } , R = 21.5 mag arcsec ^ { -2 } , I = 20.4 mag arcsec ^ { -2 } , which indicates that the site is very dark .
The extinction has been measured for the summer period , with a typical value of 0.22 mag in the V-Band , with the best measured value of 0.18 mag in a totally photometric night .
The median value of the seeing in the V -band for the last two years ( 2008-9 ) is 0.71 \arcsec , with a mode of 0.58 \arcsec .
The seeing values present a seasonal pattern , being smaller in summer ( \sim 0.69 \arcsec ) than in winter time ( 0.77 \arcsec ) .
For 68 % of the analyzed nights the seeing was better than 0.8 \arcsec during the entire night .
The seeing is found to be stable for rather long periods , in particular for the nights with good seeing values .
The typical scale , for nights with the seeing below 0.8 \arcsec , is about 5 hours for variations within 20 % of the reference value .
The fraction of totally clear nights is \sim 53 % , while the fraction of nights with at least a 30 % of the night clear is \sim 74 % .