Near-infrared photometric and polarimetric observations of comet Hale-Bopp

Hitoshi Hasegawa, Takashi Ichikawa, Shinsuke Abe, Shiomi Hamamura, Koji Ohnishi, Jun Ich Watanabe

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Near-infrared photometric and polarimetric observations of comet Hale-Bopp (1995 O1) using KONIC (Kiso Observatory Near-Infrared Camera) are reported. Observations were carried out on March 18 UT and April 26 UT 1997, when the heliocentric distances of the comet were 0.94 and 1.02 AU, and the phase angles were 48.5 deg and 32.9 deg, respectively. In the J, H, and K' bands, we obtained linear polarization of the near-nucleus region of 16.4 ± 1.2, 18.8 ± 1.3, and 15.1 ± 0.9 percent on March 18UT and 7.1 ± 1.1, 8.9 ± 1.0, and 6.9 ± 0.6 percent on April 26, respectively. These values were higher than those observed for 1P/Halley. The maximum polarization was found at H band on both dates. Polarization maps showed higher polarization regions toward the anti-solar direction in the J and H bands. No distinct correlation was found between high polarization regions and bright regions. The projected expansion velocity of the arc structure of the dust jet was 375 ± 35.7 m/s on 17-19 March. The periodicity was found to be 11.1 ± 2.8 hours.

Original languageEnglish
Pages (from-to)353-358
Number of pages6
JournalEarth, Moon and Planets
Volume78
Issue number1-3
DOIs
Publication statusPublished - 1997 Jan 1

Keywords

  • Comet
  • Dust
  • Infrared
  • Jet
  • Polarization

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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