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0343908459
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note
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-1 for the 17 to 20 June, 1 July, 18 to 23 July, 24.7 July, and 25.7 to 28.7 July periods, respectively. Rotational lines observed in the millimetric and submillimetric domains were analyzed with the excitation model of (7, 11), adopting a gas kinetic temperature of 50 K for June and of 70 K for July consistent with temperature determinations in low-activity comets. Beam offsets were taken into account in the calculations.
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0035906896
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0343010434
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19
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0343908458
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note
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-1.
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21
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0342602656
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note
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-3.
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22
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0343036890
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note
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From the line intensities obtained at offset positions 10 to 15 arc sec from the nucleus on 18 to 25 July, we do not see any evidence for an extended distribution of HCN gas. Substantial departure from a nuclear source distribution is only observed on 19.6 July and is likely due to short-term variations.
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23
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0343472724
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note
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icy/f.
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24
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0342602655
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note
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max' and total mass at t = O. The decrease of the HCN production rate observed after 23.9 July can be fitted by indexes other than α = 3.5 but always requires that the maximum size of the debris is less than a few decimeters. Because the time sampling of our observations, the fit is not sensitive to icy grains with lifetimes smaller than one day (a < 7 cm).
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25
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11544267119
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J. K. Harmon, D. B. Campbell, S. J. Ostro, M. C. Nolan, Planet. Space Science 47, 1409 (1999).
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Harmon, J.K.1
Campbell, D.B.2
Ostro, S.J.3
Nolan, M.C.4
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26
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0343472723
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thesis, Université de Paris VII
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N. Biver, thesis, Université de Paris VII (1997).
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Biver, N.1
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0000687823
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M. Fulle, H. Mikuz, M. Nonino, S. Bosio, Icarus 134, 235 (1998).
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Fulle, M.1
Mikuz, H.2
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30
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0342602654
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note
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Compiled from the International Comet Quarterly (ICQ).
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31
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0343036884
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note
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We thank J. Bauer and S. Sheppard for their help during the CSO observations, B. Marsden and D. Green for providing ephemerides, and J.-F. Crifo for fruitful discussions. N. Biver was supported partly by a JCMT fellowship at the University of Hawaii. This work was supported by the Programme National de Planétologie de l'Institut National des Sciences de l'Univers (INSU) and the Centre National de la Recherche Scientifique (CNRS). The JCMT is operated by the Joint Astronomy Centre on behalf of the Particle Physics and Astronomy Research Council of the United Kingdom, the Netherlands Organisation for Scientific Research, and the National Research Council of Canada. The Nançay Radio Observatory is operated by the Unité Scientifique de Nançay of the Observatoire de Paris, associated with the CNRS and also gratefully acknowledges the financial support of the Conseil Régional of the Région Centre in France. The National Radio Astronomy Observatory (NRAO) is operated by Associated Universities, under contract with the NSF. The CSO is supported by the NSF.
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