HD 6774

Lightcurves of 10 Hygiea, 241 Germania and 509 Iolanda The asteroids 10 Hygiea, 241 Germania and 509 Iolanda have been studiedphotometrically. From their lightcurves, synodic periods of 27.63 +/-0.02, 15.51 +/- 0.01 and 12.72 +/- 0.02 hours, and amplitudes of 0fm 28,0fm 17 and 0fm 45, have been deduced for 10 Hygiea, 241 Germania and 509Iolanda, respectively. The period found for 241 Germania is asignificant revision from one previously published, and we present afirst indication of pole orientation and shape. A synodic period isobtained for 509 Iolanda. The solution obtained for the sense ofrotation, sidereal period, pole orientation and shape properties for 10Hygiea confirms previous results.
Mesures d'etoiles doubles faites a Nice. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1978A&AS...33..275M&db_key=AST
Micrometer Measures of Double Stars. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1959ApJS....4...45V&db_key=AST

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