Portal de Periódicos da CAPES

EPOXI : COMET 103P/HARTLEY 2 OBSERVATIONS FROM A WORLDWIDE CAMPAIGN

2011; IOP Publishing; Volume: 734; Issue: 1 Linguagem: Inglês

10.1088/2041-8205/734/1/l1

2041-8213

K. J. Meech, Michael F. A’Hearn, J. Adams, P. Bacci, J. M. Bai, L. Barrera, M. Battelino, J. M. Bauer, E. E. Becklin, B. C. Bhatt, N. Biver, D. Bockelée‐Morvan, Dennis Bodewits, H. Böhnhardt, J. Boissier, B. P. Bonev, W. Borghini, J. R. Brucato, E. Bryssinck, M. W. Buie, H. Cánovas, D. Castellano, Steven B. Charnley, W. P. Chen, P. S. Chiang, Young‐Jun Choi, D. J. Christian, Yo-Ling Chuang, A. L. Cochran, P. Colom, M. R. Combi, I. M. Coulson, J. Crovisier, N. Dello Russo, K. Dennerl, K. Dewahl, M. A. DiSanti, M. Facchini, T. L. Farnham, Y. R. Fernández, H.-G. Florén, U. Frisk, T. Fujiyoshi, Reiko Furusho, T. Fuse, G. Galli, D. A. García–Hernández, Alan Gersch, Z. Getu, E. L. Gibb, M. Gillon, E. Guido, R. A. Guillermo, Edith Hadamcik, O. Hainaut, H. B. Hammel, D. E. Harker, J. K. Harmon, Walter M. Harris, P. Hartogh, M. Hashimoto, B. Häusler, T. Herter, Å. Hjalmarson, S. T. Holland, M. Honda, Sona Hosseini, E. S. Howell, N. Howes, Henry H. Hsieh, H. Y. Hsiao, Damien Hutsemékers, S. Immler, William M. Jackson, S. V. Jeffers, Emmanuël Jehin, T. J. Jones, M. de Juan Ovelar, H. M. Kaluna, Torgny Karlsson, Hideyo Kawakita, J. V. Keane, L. D. Keller, Michael S. P. Kelley, Daisuke Kinoshita, N. N. Kiselev, Jan Kleyna, Matthew M. Knight, Hitomi Kobayashi, Henry A. Kobulnicky, Ludmilla Kolokolova, M. Kreiny, Yi‐Jehng Kuan, M. Küppers, J. Lacruz, V. La Parola, L. M. Lara, A. Lecacheux, Anny Chantal Levasseur-Regourd, B. Li, J. Licandro, R. Ligustri, Zhong-Yi Lin, M. Lippi, D. C. Lis, C. M. Lisse, A. J. Lovell, S. C. Lowry, H. Lu, Stefan Lundin, K. Magee‐Sauer, Pierre Magain, Jean Manfroid, E. Mazzotta Epifani, Adam McKay, M. D. Melita, H. Mikuž, Stefanie N. Milam, Giannantonio Milani, M. Min, R. Moreno, B. E. A. Mueller, M. J. Mumma, M. Nicolini, M. C. Nolan, H. L. Nordh, Priscilla Nowajewski-Barra, Odin Team, Takafumi Ootsubo, L. Paganini, C. Perrella, J. Pittichová, E. Prosperi, Y. L. Radeva, W. T. Reach, Anthony J. Remijan, M. Rengel, T. Riesen, M. Rodenhuis, Diego Rodríguez, R. W. Russell, D. K. Sahu, Nalin H. Samarasinha, Albert Sánchez Caso, Å. Sandqvist, Gal Sarid, M. Sato, D. G. Schleicher, Edward W. Schwieterman, A. K. Sen, D. Shenoy, Jianchun Shi, Yoshiharu Shinnaka, J. Skvarč, C. Snodgrass, Michael L. Sitko, S. Sonnett, S. Sosseini, G. Sostero, Seiji Sugita, B. M. Swinyard, S. Szutowicz, N. Takato, P. Tanga, Patrick Taylor, G. P. Tozzi, R. Trabatti, J. M. Trigo‐Rodríguez, C. Tubiana, M. de Val-Borro, William D. Vacca, B. Vandenbussche, J. Vaubaillion, F. P. Velichko, Sergey Velichko, R. J. Vervack, M. J. Vidal-Núñez, G. L. Villanueva, C. Vinante, Jean‐Baptiste Vincent, M. Wang, L. H. Wasserman, J. Watanabe, H. A. Weaver, P. R. Weissman, S. J. Wolk, D. H. Wooden, C. E. Woodward, Mitsuru Yamaguchi, Takuji Yamashita, P. A. Yanamandra-Fischer, Bin Yang, J. S. Yao, D. K. Yeomans, T. Zenn, H. B. Zhao, Julie Ziffer,

Planetary Science and Exploration

Earth- and space-based observations provide synergistic information for space mission encounters by providing data over longer timescales, at different wavelengths and using techniques that are impossible with an in situ flyby. We report here such observations in support of the EPOXI spacecraft flyby of comet 103P/Hartley 2. The nucleus is small and dark, and exhibited a very rapidly changing rotation period. Prior to the onset of activity, the period was ∼16.4 hr. Starting in 2010 August the period changed from 16.6 hr to near 19 hr in December. With respect to dust composition, most volatiles and carbon and nitrogen isotope ratios, the comet is similar to other Jupiter-family comets. What is unusual is the dominance of CO2-driven activity near perihelion, which likely persists out to aphelion. Near perihelion the comet nucleus was surrounded by a large halo of water-ice grains that contributed significantly to the total water production.