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Speckle Interferometry at the US Naval Observatory. XIII.
The results of 1424 speckle interferometric observations of doublestars, made with the 26 inch (66 cm) refractor of the US NavalObservatory, are presented. Each speckle interferometric observation ofa system represents a combination of over 2000 short-exposure images.These observations are averaged into 1053 mean relative positions andrange in separation from 0.36″ to 61.92″, with a medianseparation of 10.31″. This is the 13th in a series of paperspresenting measurements obtained with this system and covers the period2006 January 12-December 29. Included in these data are nine oldermeasurements whose positions were previously deemed possibly aberrantbut are no longer classified this way following a confirmingobservation. This paper also includes the first data obtained using anew "secondary" camera, designed and built at USNO.
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Observation and Astrometry data
| Constellation: | Hercules |
| Right ascension: | 18h31m13.23s |
| Declination: | +13°10'39.1" |
| Apparent magnitude: | 9.647 |
| Proper motion RA: | 21 |
| Proper motion Dec: | -0.9 |
| B-T magnitude: | 10.113 |
| V-T magnitude: | 9.686 |
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