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We present the $g'$-, $R_{\rm c}$-, and $I_{\rm c}$-band magnitudes andassociated colors of the Starlink's STARLINK-1113 (one of the standard Starlinksatellites) and 1130 (Darksat) with a darkening treatment to its surface. Bythe 105 cm Murikabushi telescope/$\it{MITSuME}$, simultaneous multicolorobservations for the above satellites were conducted four times: on April 10,2020, May 18, 2020 (for Darksat), and June 11, 2020 (for Darksat andSTARLINK-1113). We found that (1) $g'$-band apparent magnitudes of Darksat($6.95~\pm~0.11-7.65~\pm~0.11$ mag) are comparable to or brighter than that ofSTARLINK-1113 ($7.69~\pm~0.16$ mag), (2) the shorter the observed wavelengthis, the fainter the satellite magnitudes tend to become, (3) the reflected fluxby STARLINK-1113 is extremely ($> 1.0$ mag) redder than that of Darksat, (4)there is no clear correlation between the solar phase angle andorbital-altitude-scaled magnitude, (5) by flux-model fitting of the satellitetrails with the blackbody radiation, it is found that the albedo of Darksat isabout a half of that of STARLINK-1113. Especially, the result (1) isinconsistent with the previous studies. However, considering both solar andobserver phase angles and atmospheric extinction, the brightness ofSTARLINK-1113 can be drastically reduced in the $g'$ and $R_{\rm c}$ band.Simultaneous multicolor-multispot observations more than three colors wouldgive us more detailed information regarding the impact by the low Earth orbitsatellite constellations.

Simultaneous Multicolor Observations of Starlink's Darksat by The Murikabushi Telescope with $MITSuME$