A polarization study of comet Hyakutake ( C / 1996 B 2 )
نویسنده
چکیده
Observations for the linear polarization of comet Hyakutake (C/1996B2) are carriedout at three continuumwavebands: 3650Å, 4845Å and 6840Å. These observations were taken on March 13 and March 18, 1996 when the phase angles were 38.1 and 36.9, respectively. These results indicate an increase in the degree of polarizationwith phase angle andwavelength, in general. Present results show that comet Hyakutake (C/1996 B2) exhibits similar behaviour as comet P/Halley so far as the polarization property is concerned, indicating thereby that the grain size distribution may not be very much different from that of the comet Halley. We also produce theoretical curve for the polarization percentage as a function of phase angle and compare with the observed data. The polarization at various wavebands shows a sensitive behaviour in the phase angle range 20≤ α ≥ 40 .
منابع مشابه
The Fourth Positive System of Carbon Monoxide in the Hubble Space Telescope Spectra of Comets
The rich structure of the AΠ−XΣ system of carbon monoxide accounts for many of the spectral features seen in long slit HST -STIS observations of comets 153P/Ikeya-Zhang, C/2001 Q4 (NEAT), and C/2000 WM1 (LINEAR), as well as in the HST -GHRS spectrum of comet C/1996 B2 (Hyakutake). A detailed CO fluorescence model is developed to derive the CO abundances in these comets by simultaneously fitting...
متن کاملHubbl E Space T El Escope Ultraviolet Imaging and High-resolution Spectroscopy of Water Photodissociation Products in Comet Hyakutake (c/1996 B2)
Comet Hyakutake (C/1996 B2) provided a target of opportunity for performing a systematic study of water photodissociation products in which we obtained data from three instruments on the Hubble Space T elescope (HST ). The HST Goddard High Resolution Spectrograph (GHRS) was used to measure the line proÐle of hydrogen Lya (H Lya) at six locations around the coma of the comet, ranging from the nu...
متن کاملHnc and Hcn in Comets
We use a multifluid hydrodynamical-chemical model of cometary comae to predict the HNC and HCN abundances in comets Hyakutake and Hale-Bopp for a variety of initial parameters. We find, in general, that the presence of methanol in the nuclear ices inhibits the synthesis of HNC from HCN through proton transfer reactions in the coma. For Hale-Bopp, we find that because of the large gas production...
متن کاملDust environment of Comet Hyakutake 1996B2
Narrow-band wide-field CCD images of the dust tail of Comet Hyakutake 1996B2 are analysed by means of the inverse dust tail model (Fulle 1989). The dust tail fits allow us to estimate the ejection velocity, mass loss rate and size distribution of the dust grains ejected during the months of March and April, 1996 (when the heliocentric distance was decreasing from 1.5 AU to 0.5 AU), in the size ...
متن کاملMillimeter - Wavelength Spectroscopy
Millimeter-wavelength spectra were obtained of CO, HCN, H2CO, and CH3OH in Comet C/1996 B2 (Hyakutake) with the NRAO 12-m telescope on 21 Mar 1996 UT. The emission of CO, H2CO and HCN was mapped in the coma when the comet was 0.2 AU from the Earth, providing a detailed look at the behavior of these species in the inner coma. The mapping data indicate the presence of multiple velocity components...
متن کامل