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Astrometric quality of the USNO CCD Astrograph (UCA)
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abstract
The US Naval Observatory 8--inch astrograph has been equipped with a Kodak 1536x1024 pixel CCD since June 1995, operating in a 570--650 nm bandpass. With 3--minute exposures well exposed images are obtained in the magnitude range $R \approx 8.5 - 13.5^{m}$. An astrometric precision of 10 to 15 mas for those stars is estimated from frame--to--frame comparisons. External comparisons reveal an accuracy of about 15 mas for those stars in a 20' field of view. For fainter stars, the error budget is dominated by the S/N ratio, reaching $\approx 100$ mas at $R=16^{m}$ under good observing conditions.
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Cited by 1 Pith paper
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Peering through the disc of HD 98800 BaBb. Precise timing predictions for the HD 98800 AaAb occultation
New RVs and multi-wavelength astrometry tighten the HD 98800 outer orbit by ~2×, yielding 5–15-day 1σ windows for the 2025–2031 disc occultation of AaAb.
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