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We conducted an optical and near-infrared polarimetric observation of thehighly dormant Jupiter-Family Comet, 209P/LINEAR. Because of its low activity,we were able to determine the linear polarization degrees of the coma dustparticles and nucleus independently, that is $P_n$=30.3$^{+1.3}_{-0.9}$% at$\alpha$=92.2$^\circ$ and $P_n$=31.0$^{+1.0}_{-0.7}$% at $\alpha$=99.5$^\circ$for the nucleus, and $P_c$=28.8$^{+0.4}_{-0.4}$% at $\alpha$=92.2$^\circ$ and29.6$^{+0.3}_{-0.3}$% at $\alpha$=99.5$^\circ$ for the coma. We detected nosignificant variation in $P$ at the phase angle coverage of92.2$^\circ$-99.5$^\circ$, which may imply that the obtained polarizationdegrees are nearly at maximum in the phase-polarization curves. By fitting withan empirical function, we obtained the maximum values of linear polarizationdegrees $P_\mathrm{max}$=30.8% for the nucleus and $P_\mathrm{max}$=29.6% forthe dust coma. The $P_\mathrm{max}$ of the dust coma is consistent with thoseof dust-rich comets. The low geometric albedo of $P_v$=0.05 was derived fromthe slope-albedo relationship and was associated with high $P_\mathrm{max}$. Weexamined $P_\mathrm{max}$-albedo relations between asteroids and 209P, andfound that the so-called Umov law seems to be applicable on this cometarysurface.

Optical and Near-Infrared Polarimetry for a Highly Dormant Comet 209P/LINEAR