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The pole of (51) Nemausa
Author(s) -
Kristensen L. Kahl
Publication year - 1993
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2113140506
Subject(s) - classification of discontinuities , physics , amplitude , astrophysics , rotation period , rotation (mathematics) , fourier analysis , stars , fourier transform , phase (matter) , mathematical analysis , geometry , mathematics , optics , quantum mechanics
The complex lightcurves make (51) Nemausa a good case for the study of general methods for pole determination. From six lightcurves the pole is determined to 20 h 24 m ; +53° (1950); the rotation is retrograde with period 7 h .782936 ± 0 h .5. Presence of nongeometric scattering is proved by a significant 0.008 mag amplitude. Formulae and photometric elements are given for predictions of the shapes of lightcurves in future oppositions. The precision of the Fourier coefficients may be reduced below the present ±0.003 mag level by avoiding the systematic errors in the observations due to phase factor variations and discontinuities when changing comparison stars.