Počet záznamů: 1  

On the maximum amplitude of harmonics of an asteroid lightcurve

  1. 1.
    0429291 - ASU-R 2015 RIV US eng J - Článek v odborném periodiku
    Harris, A. W. - Pravec, Petr - Galád, Adrián - Skiff, B.A. - Warner, B. D. - Világi, J. - Gajdoš, Š. - Carbognani, A. - Hornoch, Kamil - Kušnirák, Peter - Cooney jr., W. R. - Gross, J. - Terrell, D. - Higgins, D. - Bowell, E. - Koehn, B.W.
    On the maximum amplitude of harmonics of an asteroid lightcurve.
    Icarus. Roč. 235, June (2014), s. 55-59. ISSN 0019-1035
    Grant CEP: GA ČR GAP209/12/0229
    Grant ostatní:SAV(SK) Vega 1/0670/13; NASA(US) NNX13AP56G
    Institucionální podpora: RVO:67985815
    Klíčová slova: asteroids * asteroids rotation * photometry
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
    Impakt faktor: 3.038, rok: 2014

    Most asteroid lightcurves are dominated by the second harmonic of the rotation period, caused by elongated shape. However, if the shape is not very elongate, other harmonics may dominate, leading to ambiguity of which is the true rotation period. We argue from geometry that at low phase angle, harmonics other than the second with amplitude exceeding resp. 0.4 magnitude are nearly impossible, so lightcurves with larger amplitude than that suggest a unique period dominated by the second harmonic, unless the spin is complex, non-principal axis rotation. On the other hand, lightcurves with amplitude less than 0.2–0.3 magnitudes can be dominated by other harmonics, especially the 4th and 6th, so the period may be ambiguous unless odd harmonics can be found to identify the true rotation period. We present examples of each, low and high amplitude ambiguities.
    Trvalý link: http://hdl.handle.net/11104/0234455