Abstract
We present speckle interferometric measurements of double stars performed during August of 2010 with the 1.5 m telescope and during May of 2010 with the 2.1 m telescope of the Observatorio Astronómico Nacional at SPM (México). We report here the results of 331 measurements of 321 systems with a primary limiting magnitude of V = 12.9. The measured angular separations range from 0 arcsec .13 to 7 arcsec .39. Two hundred and sixty-nine pairs have separations less than 1 arcsec. The mean error in separation is 0 arcsec .032 and 2° in position angle.The usual 180° ambiguity was corrected for the majority of position angles by comparison with observations performed by other observers.
