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We performed a monitoring observation of a Jupiter-Family comet, 17P/Holmes,during its 2014 perihelion passage to investigate its secular change inactivity. The comet has drawn the attention of astronomers since its historicoutburst in 2007, and this occasion was its first perihelion passage sincethen. We analyzed the obtained data using aperture photometry package andderived the Afrho parameter, a proxy for the dust production rate. We foundthat Afrho showed asymmetric properties with respect to the perihelion passage:it increased moderately from 100 cm at the heliocentric distance r_h=2.6-3.1 AUto a maximal value of 185 cm at r_h = 2.2 AU (near the perihelion) during theinbound orbit, while dropping rapidly to 35 cm at r_h = 3.2 AU during theoutbound orbit. We applied a model for characterizing dust production rates asa function of r_h and found that the fractional active area of the cometarynucleus had dropped from 20%-40% in 2008-2011 (around the aphelion) to0.1%-0.3% in 2014-2015 (around the perihelion). This result suggests that adust mantle would have developed rapidly in only one orbital revolution aroundthe sun. Although a minor eruption was observed on UT 2015 January 26 at r_h =3.0 AU, the areas excavated by the 2007 outburst would be covered with a layerof dust (<~ 10 cm depth) which would be enough to insulate the subsurface iceand to keep the nucleus in a state of low activity.

Monitoring Observations of the Jupiter-Family Comet 17P/Holmes during 2014 Perihelion Passage