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Title: INFRARED AND OPTICAL IMAGINGS OF THE COMET 2P/ENCKE DUST CLOUD IN THE 2003 RETURN

Abstract

We report contemporaneous imaging observations of the short-period comet 2P/Encke in infrared and optical wavelengths during the 2003 return. Both images show the same unique morphology consisting of a spiky dust cloud near the nucleus and a dust trail extending along the orbit. We conducted a dynamical simulation of dust particles to characterize the morphology and found that dust particles were ejected intensively for a short duration (≲10 days) a few days after perihelion passage. The maximum particle size is at least on the order of 1 cm in radius following a differential power-law size distribution with an index of −3.2 to −3.6. The total mass ejected in the 2003 return is at least 1.5 × 10{sup 9}–1.2 × 10{sup 10} kg, which corresponds to 0.003%–0.03% of the nucleus mass. We derived the albedo of the dust cloud as 0.01–0.04 at a solar phase angle of 26.°2, which is consistent with or possibly greater than that of the nucleus. We suppose that impulsive activity such as an outburst is a key to understanding the peculiar appearance of 2P/Encke.

Authors:
;  [1];  [2];  [3];  [4]
  1. Kiso Observatory, Institute of Astronomy, School of Science, The University of Tokyo, 10762-30 Mitake, Kiso-machi, Kiso-gun, Nagano 397-0101 (Japan)
  2. Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of)
  3. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210 (Japan)
  4. Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
Publication Date:
OSTI Identifier:
22522443
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 804; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALBEDO; CLOUDS; COMETS; COMPUTERIZED SIMULATION; COSMIC DUST; IMAGES; INDEXES; INFRARED SPECTRA; MASS; MORPHOLOGY; ORBITS; PARTICLE SIZE; PARTICLES; VISIBLE SPECTRA

Citation Formats

Sarugaku, Yuki, Ueno, Munetaka, Ishiguro, Masateru, Usui, Fumihiko, and Reach, William T., E-mail: sarugaku@kiso.ioa.s.u-tokyo.ac.jp. INFRARED AND OPTICAL IMAGINGS OF THE COMET 2P/ENCKE DUST CLOUD IN THE 2003 RETURN. United States: N. p., 2015. Web. doi:10.1088/0004-637X/804/2/127.
Sarugaku, Yuki, Ueno, Munetaka, Ishiguro, Masateru, Usui, Fumihiko, & Reach, William T., E-mail: sarugaku@kiso.ioa.s.u-tokyo.ac.jp. INFRARED AND OPTICAL IMAGINGS OF THE COMET 2P/ENCKE DUST CLOUD IN THE 2003 RETURN. United States. doi:10.1088/0004-637X/804/2/127.
Sarugaku, Yuki, Ueno, Munetaka, Ishiguro, Masateru, Usui, Fumihiko, and Reach, William T., E-mail: sarugaku@kiso.ioa.s.u-tokyo.ac.jp. Sun . "INFRARED AND OPTICAL IMAGINGS OF THE COMET 2P/ENCKE DUST CLOUD IN THE 2003 RETURN". United States. doi:10.1088/0004-637X/804/2/127.
@article{osti_22522443,
title = {INFRARED AND OPTICAL IMAGINGS OF THE COMET 2P/ENCKE DUST CLOUD IN THE 2003 RETURN},
author = {Sarugaku, Yuki and Ueno, Munetaka and Ishiguro, Masateru and Usui, Fumihiko and Reach, William T., E-mail: sarugaku@kiso.ioa.s.u-tokyo.ac.jp},
abstractNote = {We report contemporaneous imaging observations of the short-period comet 2P/Encke in infrared and optical wavelengths during the 2003 return. Both images show the same unique morphology consisting of a spiky dust cloud near the nucleus and a dust trail extending along the orbit. We conducted a dynamical simulation of dust particles to characterize the morphology and found that dust particles were ejected intensively for a short duration (≲10 days) a few days after perihelion passage. The maximum particle size is at least on the order of 1 cm in radius following a differential power-law size distribution with an index of −3.2 to −3.6. The total mass ejected in the 2003 return is at least 1.5 × 10{sup 9}–1.2 × 10{sup 10} kg, which corresponds to 0.003%–0.03% of the nucleus mass. We derived the albedo of the dust cloud as 0.01–0.04 at a solar phase angle of 26.°2, which is consistent with or possibly greater than that of the nucleus. We suppose that impulsive activity such as an outburst is a key to understanding the peculiar appearance of 2P/Encke.},
doi = {10.1088/0004-637X/804/2/127},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 804,
place = {United States},
year = {2015},
month = {5}
}