Assessment of the accuracy of measures in the 1829 southern double star catalogue of James Dunlop
نویسندگان
چکیده
ABSTRACT In 1829 James Dunlop published the first southern double star catalogue of some 253 stars. The accuracy this has been determined by using Aladin to cross-match them with Gaia DR2 and estimate their positional (right ascension, declination, position angle, separation) magnitude accuracy. Seven per cent could not be identified 14 were single We found 13 stars (5 cent) currently listed in Washington Double Star Catalog. equinox was as B1826.0. Overall, 1σ uncertainties right ascension within 1 sidereal minute declinations 10 arcmin. also corrected a number Quadrant errors angles quantified separations. Apparent visual estimates generally mag. Dunlop’s overall larger than those his contemporaries, nevertheless little known remains valuable earliest source over 200 astrometric estimates.
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2021
ISSN: ['0035-8711', '1365-8711', '1365-2966']
DOI: https://doi.org/10.1093/mnras/stab3777