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WHT blind offsetting

Observations in late 1997 and early 1998 of star pairs, from a catalogue provided by Janet Sinclair (RGO), show that blind-offsetting is accurate to < 0.2 arcsec rms over offsets up to at least 20 arcmin on the sky.

Blind-offsetting accuracy is < 1 arcsec (better than pointing rms) over 20 deg (Jul 1999). This is useful for checking which of two similar objects on the TV is the target, by blind-offsetting from the nearest pointing-grid star (tip from Peter Sorensen).

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Last modified: 23 February 2016