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arXiv 0704.1636astro-ph
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冥王星矮行星和其他大型柯伊伯带天体的光变曲线:自转、相函数和绝对星等

Light Curves of Dwarf Plutonian Planets and other Large Kuiper Belt Objects: Their Rotations, Phase Functions and Absolute Magnitudes

Scott S. Sheppard

摘要:

我报告了新的光变曲线,并确定了几个大型柯伊伯带天体的旋转和相位函数,包括矮行星厄里斯(2003 UB 313)。(120348)2004 TY 364显示的光变曲线如果是双峰的话,其周期为11.70 ± 0.01小时,峰-峰振幅为0.22 ± 0.02星等。(84922)2003 VS 2有一个很好的双峰光变曲线,为7.41 ± 0.02小时,震级范围为0.21 ± 0.02。(126154)2001 YH 140的变率为0.21+-0.04等,可能有13.25+-0.2小时的单峰周期。样本中的7个新KBO在短旋转时间尺度上的不确定性范围内没有明显变化,它们是2001 UQ 18,(55565)2002 AW 197,(119979)2002 WC 19,(120132)2003 FY 128,(136108)Eris 2003 UB 313,(90482)Orcus 2004 DW,和(90568)2004 GV 9。三个中型到大型柯伊伯带天体2004 TY 364、奥库斯和2004 GV 9在相位角为0.1度到1.5度之间显示出相当陡峭的线性相位曲线(每度约0.18到0.26 mags)。非常大的矮行星厄里斯(2003 UB 313)显示出较浅的相位曲线(0.09+-0.03 mags/degree),这与另一颗已知的矮行星冥王星更相似。看来柯伊伯带中最大的矮行星的表面性质可能与柯伊伯带中较小的天体不同。这可能与较大的物体能够容纳更多挥发性冰以及维持大气层有关。使用所测量的相位斜率获得的绝对幅度与MPC给出的幅度相差十分之几。

英文摘要:

(Abridged) I report new light curves and determine the rotations and phase functions of several large Kuiper Belt objects, including the dwarf planet Eris (2003 UB313). (120348) 2004 TY364 shows a light curve which if double-peaked has a period of 11.70+-0.01 hours and peak-to-peak amplitude of 0.22+-0.02 magnitudes. (84922) 2003 VS2 has a well defined double-peaked light curve of 7.41+-0.02 hours with a 0.21+-0.02 magnitude range. (126154) 2001 YH140 shows variability of 0.21+-0.04 magnitudes with a possible 13.25+-0.2 hour single-peaked period. The seven new KBOs in the sample which show no discernible variations within the uncertainties on short rotational time scales are 2001 UQ18, (55565) 2002 AW197, (119979) 2002 WC19, (120132) 2003 FY128, (136108) Eris 2003 UB313, (90482) Orcus 2004 DW, and (90568) 2004 GV9. The three medium to large sized Kuiper Belt objects 2004 TY364, Orcus and 2004 GV9 show fairly steep linear phase curves (~0.18 to 0.26 mags per degree) between phase angles of 0.1 and 1.5 degrees. The extremely large dwarf planet Eris (2003 UB313) shows a shallower phase curve (0.09+-0.03 mags per degree) which is more similar to the other known dwarf planet Pluto. It appears the surface properties of the largest dwarf planets in the Kuiper Belt maybe different than the smaller Kuiper Belt objects. This may have to do with the larger objects ability to hold more volatile ices as well as sustain atmospheres. The absolute magnitudes obtained using the measured phase slopes are a few tenths of magnitudes different from those given by the MPC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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