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Deep Impact, Stardust-NExT and the behavior of Comet 9P/Tempel 1 from 1997 to 2010 |
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| Authors: | KJ Meech J Pittichová B Yang P Candia Y Fernández D Polishook G Sarid |
| Institution: | a Univ. Hawai’i, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA b Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA c Belton Space Exploration Initiatives, LLC, 430 S. Randolph Way, Tucson, AZ 85716, USA d Univ. Maryland, Dept. of Astronomy, College Park, MD 20742, USA e Armagh Observatory, College Hill, Armagh BT61 9DG, UK f Yunnan Astronomical Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 65011, Yunnan, PR China g Universidad Metropolitana de Ciencias de la Educacíon, Dep. Fisica, Avda. Jose Pedro Alessandri 774, Santiago, Chile h Jet Propulsion Laboratory, MS 183-301, 4800 Oak Grove Drive, Pasadena, CA 91109, USA i University of Hawai’i, Honolulu, HI 96822, USA j Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034, India k Max-Planck Institut fur Sonnensystemforschung, Max-Planck Str. 2, 37191 Katlenburg-Lindau, Germany l The Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, 69978 Tel-Aviv, Israel m Southwest Research Institute, 1050 Walnut St., Suite 300, Boulder, CO 80302, USA n Geminit Observatory, c/o AURA, Casilla 603, La Serena, Chile o Grad. Inst. of Astronomy, National Central Univ., 300 Jhongda Road, Jhongli 32001, Taiwan p Jet Propulsion Laboratory, MS 301-150, 4800 Oak Grove Drive, Pasadena, CA 91109, USA q National Central University, Jhongli City 320, Taiwan r Korea Astronomy and Space Science Institute, 776 Daedukdaero, Yuseong-gu, Daejeon 305-348, South Korea s Univ. Texas, Dept. Astronomy, 1 University Station, C1400, Austin, TX 78712, USA t Centre for Astrophysics and Planetary Science, School of Physical Sciences, The University of Kent, Canterbury CT2 7NH, UK u Univ. Central Florida, Dept. of Physics, 4000 Central Florida Blvd., Orlando, FL 32816-2385, USA v Instituto de Astrofísica de Andalucía - CSIC, Camino Bajo de Huétor 50, 18080 Granada, Spain w European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei Munchen, Germany x Geophysical Institute, Univ. AK, 903 Koyukuk Dr., Fairbanks, AK 99775-7320, USA y Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA z Yonsei University, Dept. of Astronomy, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea aa Dept. of Physics and Astronomy, Texas A&M Univ., College Station, TX 77843-4242, USA ab National Optical Astronomy Observatory, 950 N. Cherry Ave., Tucson, AZ 85719, USA ac Instituto de Astrof?´sica de Canarias, c/V?´a Láctea s/n, 38200 La Laguna, y Dept. de Astrof?´sica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain ad Goddard Spaceflight Center, 8800 Greenbelt Rd., Greenbelt, MD 20771, USA ae Dept. of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Rd., Washington, DC 20015, USA af Planetary Science Institute, 1700 E. Ft. Lowell Rd., Suite 106, Tucson, AZ 85719, USA ag Dept. Geophysics & Planetary Sciences, Tel Aviv University, 69978 Tel-Aviv, Israel ah National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka-shi, JP Tokyo 181-8588, Japan ai Lowell Observatory & Institute for Astrophysical Research, Boston University, 1400 W. Mars Hill Road, Flagstaff, AZ 86001, USA aj INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy ak HAS, 47-728 Hui Kelu St. #9, Kaneohe, HI 96744, USA al Purple Mountain Obs., Chinese Academy of Sciences, 2# West Beijing Road, Nanjing 210008, PR China am NASA Astrobiology Institute, USA an Astronomical Institute of Slovak Academy of Sciences, Dúbravská cesta 9, 845 04 Bratislava, Slovak Republic |
| Abstract: | We present observational data for Comet 9P/Tempel 1 taken from 1997 through 2010 in an international collaboration in support of the Deep Impact and Stardust-NExT missions. The data were obtained to characterize the nucleus prior to the Deep Impact 2005 encounter, and to enable us to understand the rotation state in order to make a time of arrival adjustment in February 2010 that would allow us to image at least 25% of the nucleus seen by the Deep Impact spacecraft to better than 80 m/pixel, and to image the crater made during the encounter, if possible. In total, ∼500 whole or partial nights were allocated to this project at 14 observatories worldwide, utilizing 25 telescopes. Seventy percent of these nights yielded useful data. The data were used to determine the linear phase coefficient for the comet in the R-band to be 0.045 ± 0.001 mag deg−1 from 1° to 16°. Cometary activity was observed to begin inbound near r ∼ 4.0 AU and the activity ended near r ∼ 4.6 AU as seen from the heliocentric secular light curves, water-sublimation models and from dust dynamical modeling. The light curve exhibits a significant pre- and post-perihelion brightness and activity asymmetry. There was a secular decrease in activity between the 2000 and 2005 perihelion passages of ∼20%. The post-perihelion light curve cannot be easily explained by a simple decrease in solar insolation or observing geometry. CN emission was detected in the comet at 2.43 AU pre-perihelion, and by r = 2.24 AU emission from C2 and C3 were evident. In December 2004 the production rate of CN increased from 1.8 × 1023 mol s−1 to QCN = 2.75 × 1023 mol s−1 in early January 2005 and 9.3 × 1024 mol s−1 on June 6, 2005 at r = 1.53 AU. |
| Keywords: | Comet Tempel 1 Comets Nucleus Comets Dust Photometry Ices |
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