The evolution of P/Encke's light curve - No secular fading, a vanishing perihelion asymmetry

Details The evolution of P/Encke's light curve - No secular fading, a vanishing perihelion asymmetry The evolution of P/Encke's light curve - No secular fading, a vanishing perihelion asymmetry

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...93..226k&link_type=abstract

Icarus (ISSN 0019-1035), vol. 93, Oct. 1991, p. 226-245. Research supported by A. and A. Lofberg Foundation.

Physics

14

Encke Comet, Light Curve, Perihelions, Brightness, Fading, Orbital Elements

Scientific paper

No evidence of secular fading is presently noted in the 1832-1987 light-curve evolution of Comet P/Encke. It is suggested that what has previously been interpreted as secular fading is instead a shift in the time of maximum brightness from three weeks prior to perihelion, in the mid-19th century, to a few days after perihelion, at the most recent apparitions. An associated reduction in the lightcurve's perihelion asymmetry appears to correlate with the same period's reduction in nongravitational effect. Anomalously high magnitudes occasionally reported near the time of maximum brightness may indicate that this comet's brightness tends to be underestimated near perihelion.

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