J/A+A/658/A158 A polarimetric study of ACOs (Geem+, 2022)
A polarimetric study of asteroids in comet-like orbits.
Geem J., Ishiguro M., Bach Y.P., Kuroda D., Natio H., Hanayama H., Kim Y.,
Kwon Y.G., Jin S., Sekiguchi T., Okazaki R., Vaubaillon J.J., Imai M.,
Oono T., Futamura Y., Takagi S., Sato M., Kuramoto K., Watanabe M.
<Astron. Astrophys. 658, A158 (2022)>
=2022A&A...658A.158G 2022A&A...658A.158G (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Minor planets ; Photometry ; Optical ; Polarization
Keywords: techniques: polarimetric -
minor planets, asteroids: individual: (944) Hidalgo -
minor planets, asteroids: individual: (3552) Don Quixote -
minor planets, asteroids: individual: (331471) 1984 QY1
Abstract:
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. We conducted the first polarimetric research of ACOs. 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). We found that two ACOs, Don Quixote and Hidalgo, have
polarimetric properties similar to comet nuclei and D-type asteroids
(optical analogs of comet nuclei. However, 1984 QY1 exhibited a
polarimetric property consistent with S-type asteroids. We conducted a
backward orbital integration to determine the origin of 1984 QY1 and
found that this object was transported from the main belt into the
current comet-like orbit via the 3:1 mean motion resonance with
Jupiter. We conclude that the origins of ACOs can be more reliably
identified by adding polarimetric data to the color and spectral
information. This study would be valuable for investigating how the
ice-bearing small bodies distribute in the inner solar system.
Description:
Polarimetric data of ACOs (FITS). These data are preprocessed (Bias
subtraction and flat fielding correction). If you need to access the
raw data, please contact the first author, Jooyeon Geem
(ksky0422(at)gmail.com) or the corresponding author, Masateru Ishiguro
(ishiguro(at)snu.ac.kr). The files, 'qy1-r.dat' and 'qy1-i.dat'
contain the lightcurve data (Fig. B.1. in the appendix). The reduced
magnitude obtained from the Ishigakijima Astronomical Observatory, the
Okayama Astrophysical Observatory and the Observatoire de
Haute-Provence taken in the Rc-, Ic-band.
objects:
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Planet Name H i e a
mag deg AU
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944 Hidalgo 10.69 42.545995 0.66062630 5.73285041
3552 Don Quixote 12.96 31.091500 0.70886550 4.26199581
331471 1984 QY1 15.54 14.278657 0.89413551 2.49974767
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
qy1-r.dat 36 1053 (331471) 1984 QY1 relative photometric data
in Rc-band
qy1-i.dat 36 992 (331471) 1984 QY1 relative photometric data
in Ic-band
list.dat 129 580 List of fits images
fits/* . 580 Individual fits images
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Byte-by-byte Description of file: qy1-r.dat qy1-i.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d JD Julian date
18 A1 --- Filter [IR] Filter
20- 25 F6.2 deg phi Phase angle (Sun-object-Earth)
27- 31 F5.2 mag mag Reduced magnitude in Filter
33- 36 F4.2 mag e_mag Error of reduced magnitude
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 37 A10 "datime" Obs.date Observation date
39- 42 I4 Kibyte size Size of FITS file
44- 84 A41 --- FileName Name of FITS file, in subdirectory fits
86-129 A44 --- Title Title of the FITS file
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Acknowledgements:
Jooyeon Geem, geem(at)astro.snu.ac.kr
(End) Patricia Vannier [CDS] 07-Oct-2021