000002673 001__ 2673
000002673 005__ 20160701171709.0
000002673 037__ $$aASTROimport-830
000002673 100__ $$aLampens, P.
000002673 245__ $$aAre these observations really necessary?
000002673 260__ $$c2005
000002673 520__ $$aWe draw the attention to some bright, double and multiple visual systems with long-period orbits currently lacking high-quality astrometric data and we present arguments for resuming astrometric observations of these apparently very classical systems. When - for any good reason - a thorough study of these is being undertaken, the importance of the coverage of the critical phases in the orbit by follow-up observations should once more be stressed. 
000002673 700__ $$a Frémat, Y.
000002673 773__ $$c276$$pAstrometry in the Age of the Next Generation of Large Telescopes$$v338$$y2005
000002673 85642 $$ahttp://esoads.eso.org/abs/2005ASPC..338..276L
000002673 905__ $$apublished in
000002673 980__ $$aNONREF