Cometary activity in 2060 Chiron at minimum brightness

被引：5

作者：

Silva, AM

Cellone, SA

机构：

[1] Natl Univ La Plata, Fac Ciencias Astron & Geofis, RA-1900 La Plata, Argentina

[2] Inst Astron & Fis Espacio, RA-1428 Buenos Aires, DF, Argentina

来源：

PLANETARY AND SPACE SCIENCE | 2001年 / 49卷 / 13期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0032-0633(01)00052-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present two-colour CCD imaging of 2060 Chiron obtained between 1996 and 1998 with the 2.15 m telescope at CASLEO (San Juan, Argentina). These post-perihelion observations show that Chiron was then near its historical brightness minima. however, a coma was clearly detected. The dynamical state of the coma is studied by means of azimuthally averaged surface brightness profiles, which show the signatures of radiation pressure on the dust grain distribution. Aperture photometry shows an achromatic dimming with an amplitude approximate to 0.09 mag in approximately 1 h. If due to rotation of the nucleus, this rather high amplitude is used to derive a new value for the nuclear magnitude, m(o) approximate to 6.80 mag. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：1325 / 1330

页数：6

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