论文标题
Murikabushi望远镜的Starlink Darksat的同时多彩观察与MITSUME $
Simultaneous Multicolor Observations of Starlink's Darksat by The Murikabushi Telescope with $MITSuME$
论文作者
论文摘要
我们介绍$ g'$ - ，$ r _ {\ rm c} $ - 和$ i _ {\ rm c} $ - 频段幅度和Starlink的Starlink-1113（标准的Starlink卫星之一）和1130（Darksat的标准Starlink-1113）和相关的颜色，表面具有暗处理。到105厘米的Murikabushi望远镜/$ \ IT {MITSUME} $，对上述卫星的同时进行了多色观察，进行了四次：2020年4月10日，2020年5月18日，2020年5月18日（用于Darksat）和2020年6月11日（用于Darksat和Starlink-11113）。 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 of STARLINK-1113 ($7.69~\pm~0.16$ mag), (2) the shorter the observed wavelength is, the fainter the satellite magnitudes tend to become, (3) the reflected flux by STARLINK-1113 is extremely ($> 1.0$ mag) redder than that of Darksat, (4) there is no clear correlation between the solar phase angle and orbital-altitude-scaled magnitude, (5) by flux-model fitting of the satellite trails with the blackbody radiation, it is found that the albedo of Darksat is about a half of that of STARLINK-1113.特别是，结果（1）与先前的研究不一致。但是，考虑到太阳能和观察者相位角度和大气灭绝，Starlink-1113的亮度可以在$ g'$和$ r _ {\ rm c} $ band中大大降低。同时进行多色的观察结果超过三种颜色将为我们提供有关低地球轨道卫星星座影响的更多详细信息。
We present the $g'$-, $R_{\rm c}$-, and $I_{\rm c}$-band magnitudes and associated colors of the Starlink's STARLINK-1113 (one of the standard Starlink satellites) and 1130 (Darksat) with a darkening treatment to its surface. By the 105 cm Murikabushi telescope/$\it{MITSuME}$, simultaneous multicolor observations for the above satellites were conducted four times: on April 10, 2020, May 18, 2020 (for Darksat), and June 11, 2020 (for Darksat and STARLINK-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 of STARLINK-1113 ($7.69~\pm~0.16$ mag), (2) the shorter the observed wavelength is, the fainter the satellite magnitudes tend to become, (3) the reflected flux by STARLINK-1113 is extremely ($> 1.0$ mag) redder than that of Darksat, (4) there is no clear correlation between the solar phase angle and orbital-altitude-scaled magnitude, (5) by flux-model fitting of the satellite trails with the blackbody radiation, it is found that the albedo of Darksat is about a half of that of STARLINK-1113. Especially, the result (1) is inconsistent with the previous studies. However, considering both solar and observer phase angles and atmospheric extinction, the brightness of STARLINK-1113 can be drastically reduced in the $g'$ and $R_{\rm c}$ band. Simultaneous multicolor-multispot observations more than three colors would give us more detailed information regarding the impact by the low Earth orbit satellite constellations.
