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| Content Provider | Springer Nature Link |
|---|---|
| Author | Hasegawa, Hitoshi Ichikawa, Takashi Abe, Shinsuke Hamamura, Shiomo Ohnishi, Koji Watanabe, Jun Ich |
| Copyright Year | 1997 |
| 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. |
| Starting Page | 353 |
| Ending Page | 358 |
| Page Count | 6 |
| File Format | |
| ISSN | 01679295 |
| Journal | Earth, Moon, and Planets |
| Volume Number | 78 |
| Issue Number | 1-3 |
| e-ISSN | 15730794 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 1997-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | Subscribed |
| Subject Keyword | Geophysics/Geodesy Planetology Remote Sensing/Photogrammetry Astronomy, Astrophysics and Cosmology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
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