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Speckle Interferometry at the US Naval Observatory. III.
Position angles and separations resulting from 2578 speckleinterferometric observations of 590 binary stars are tabulated. This isthe third in a series of papers presenting measures obtained using the66 cm refractor at the US Naval Observatory in Washington, DC, andcovers the period from 1995 June through 1996 December. Program starsrange in separation from 0.2" to 4.3", with a limiting magnitude ofV=11. Random errors are estimated to be 17.0 mas in separation and0.56d/rho in position angle, where rho is the separation in arcseconds.These are the first results acquired using an improved intensified CCDdetector. The new detector, in concert with an intensity-filteringtechnique applied in software, has permitted a 1 mag increase in dynamicrange, to 3.5 mag, for pairs separated by about 2". The instrumentationand calibration are briefly described, with an emphasis on thecharacteristics of the new detector. The software filter used toincrease the dynamic range is also described.
| Mesures d'étoiles doubles faites aux Observatoires Yerkes et McDonald
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Datos observacionales y astrométricos
| Constelación: | Águila |
| Ascensión Recta: | 19h35m27.22s |
| Declinación: | +11°26'22.4" |
| Magnitud Aparente: | 10.255 |
| Movimiento Propio en Ascensión Recta: | 0.6 |
| Movimiento Propio en Declinación: | -7.9 |
| B-T magnitude: | 10.476 |
| V-T magnitude: | 10.274 |
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