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The activity and dynamical evolution of quasi-hilda asteroid (457175) 2008 GO98

机译：准希尔达小行星的活动和动力学演化（457175）2008 GO98

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摘要

The quasi-Hilda asteroid (457175) 2008 GO98 was found in a previous study as a good candidate to show cometary activity since it seems to come from the Centaurs region. The object was observed in the post-perihelion arc of its orbit during several runs between September 2016 and June 2017 with the 2.15 m telescope at Complejo Astrondmico El Leoncito (CASLEO) in San Juan, Argentina. The images obtained were analyzed and the object was observed active with a small coma that grew in size and brightness as the object moved away from the perihelion of the orbit, while in June 2017 it also showed a small tail. In order to get an estimation of the diameter of the nucleus the coma contribution has been calculated and subtracted to find values of 15.5 +/- 4.0 km and 20.1 +/- 5.4 km for albedos of P-R = 0.13 and P-R = 0.069, respectively. To understand the recent dynamical evolution of (457175) 2008 G098, the orbit of the object and those of 100 clones were numerically integrated backward and forward in time for 30000 yr. The dynamical evolution confirms that this object is a recent incomer from the outer region of the solar system but it will return to this region in a short period of time indicating that its present dynamical state is rather transient.
机译：在先前的研究中发现准希尔达小行星（457175）2008 GO98是显示彗星活动的良好候选者，因为它似乎来自半人马座地区。在2016年9月至2017年6月之间的几次运行中，用2.15 m望远镜在阿根廷圣胡安的Complejo Astrondmico El Leoncito（CASLEO）观测到了该物体在轨道的近日点后弧。分析所获得的图像，并观察到该物体处于活动状态，并带有小昏迷，随着该物体从轨道近日点移开，其大小和亮度逐渐增大，而在2017年6月，它还显示出一条小尾巴。为了获得核直径的估计值，已计算并减去了彗形象差，以得出P-R = 0.13和P-R = 0.069的反照率分别为15.5 +/- 4.0 km和20.1 +/- 5.4 km。为了了解（457175）2008 G098的最新动态演化，对对象的轨道和100个克隆的轨道进行了30000年的时间上前后数字积分。动力学演化证实该物体是太阳系外围区域的新近收入者，但它将在短时间内返回该区域，表明其当前的动力学状态相当短暂。

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  • 来源
    《Planetary and space science》 |2018年第10期|12-18|共7页
  • 作者

    Garcia-Migani E.; Gil-Hutton R.;

  • 作者单位

    Univ Nacl San Juan, CONICET, Fac Ciencias Exactas Fis & Nat, Grp Ciencias Planetarias,Dept Geofis & Astron, Av Jose I de la Roza 590 O,J5402DCS Rivadavia, San Juan, Argentina;

    Univ Nacl San Juan, CONICET, Fac Ciencias Exactas Fis & Nat, Grp Ciencias Planetarias,Dept Geofis & Astron, Av Jose I de la Roza 590 O,J5402DCS Rivadavia, San Juan, Argentina;

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  • 正文语种 eng
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  • 关键词

    Comets; Centaurs; Minor planets; Asteroids;

    机译：彗星;半人马座;小行星;小行星;

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