A review of SOHO/UVCS observations of sungrazing comets |
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| Institution: | 1. Astronomy Department, Florence University, L.go E. Fermi 5, 50125 Florence, Italy;2. INAF-Arcetri Astroph. Obs., L.go E. Fermi 5, 50125 Firenze, Italy;3. Harvard-Smithsonian CFA, 60 Garden St., Cambridge, MA 02138, USA;4. INAF-Torino Astronomical Observatory, Strada Osservatorio 20, 10025 Pino Torinese, Italy;1. Observatoire de Paris-Meudon, France;2. Vikram Sarabhai Space Centre, Trivandrum, India;3. National Central University, Jhongli City, Taiwan (ROC);1. Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany;2. Institut für Theoretische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany;3. DLR-Institut für Planetenforschung, Rutherfordstr. 2, 12489 Berlin, Germany;1. Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland;2. Department of Mechanical Engineering, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu 30010, Taiwan;1. Department of Physics, School of Physical, Chemical and Applied Sciences, Pondicherry University, R.V. Nagar, Kalapet, Pondicherry 605014, India;2. School of Chemical Engineering, Yeungnam University, 214-1, Dae-dong, Gyeongsan-si, Gyeongsangbuk-do 712-749, South Korea;3. St. Aloysius College, Edathua, Alappuzha, Kerala 689573, India;1. National Geophysical Research Institute (CSIR), Uppal Road, Hyderabad 500007, India;2. Ministry of Earth Science, New Delhi 110003, India;1. Dipartimento di Ingegneria Meccanica e Aerospaziale, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;3. Department of Astronomy, Boston University, 725 Commonwealth Ave, Boston, MA 02215, USA;1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Information Photonic Technique, Xi’an Jiaotong University, Xi’an 710049, China;2. The State Key Laboratory of Astronautic Dynamics, Xi’an Satellite Control Center, Xi’an 710043, China |
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| Abstract: | In the last 10 years more than 1000 sungrazing comets have been discovered by the LASCO coronagraphs aboard SOHO the spacecraft; from this huge amount of data it has been possible to study the common origin of these comets and to explain some of the main peculiarities observed in their lightcurves. Moreover, the UV Coronagraph Spectrometer (UVCS) aboard SOHO allowed EUV spectroscopy of sungrazers in the final stage of their trajectory (i.e. between 1.4 and 10 solar radii), but a few sungrazers have been observed with this instrument. In this paper we review the main results from the UVCS observation of sungrazers C/1996 Y1, C/2000 C6 and C/2001 C2, discussing also the first possible detection of two fragments and the determination of the pyroxene dust grain number density in the latter one. Preliminary results on the UVCS data interpretation of a sungrazer observed in 2002 (C/2002 S2) are also presented here. |
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