A polarimetric study of asteroids in comet-like orbits★

作者：Geem Jooyeon; Ishiguro Masateru; Bach Yoonsoo P.; Kuroda Daisuke; Naito Hiroyuki; Hanayama Hidekazu; Kim Yoonyoung; Kwon Yuna G.; Jin Sunho; Sekiguchi Tomohiko; Okazaki Ryo; Vaubaillon Jeremie J.; Imai Masataka; Oono Tatsuharu; Futamura Yuki; Takagi Seiko; Sato Mitsuteru; Kuramoto Kiyoshi; Watanabe Makoto

来源：Astronomy & Astrophysics, 2022, 658: A158.

DOI：10.1051/0004-6361/202142014

• techniques: polarimetric
• minor planets, asteroids: individual: (944) Hidalgo
• minor planets, asteroids: individual: (3552) Don Quixote
• minor planets, asteroids: individual: (331471) 1984 QY1

Context. Asteroids in comet-like orbits (ACOs) consist of asteroids and dormant comets. Due to their similar appearance, it is challenging to distinguish dormant comets from ACOs via general telescopic observations. Surveys for discriminating dormant comets from the ACO population have been conducted via spectroscopy or optical and mid-infrared photometry. However, they have not been conducted through polarimetry.Aims. We conducted the first polarimetric research of ACOs.Methods. We conducted a linear polarimetric pilot survey for three ACOs: (944) Hidalgo, (3552) Don Quixote, and (331471) 1984 QY1. These objects are unambiguously classified into ACOs in terms of their orbital elements (i.e., the Tisserand parameters with respect to Jupiter TJ significantly less than 3). Three ACOs were observed by the 1.6 m Pirka Telescope from UT 2016 May 25 to UT 2019 July 22 (13 nights).Results. We found that Don Quixote and Hidalgo have polarimetric properties similar to comet nuclei and D-type asteroids (opti...