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Asteroid Shape and Spin Statistics from Convex Models J
Asteroid shape and spin statistics from convex models J. Torppa, V.-P. Hentunen, P. Pääkkönen, P. Kehusmaa, K. Muinonen To cite this version: J. Torppa, V.-P. Hentunen, P. Pääkkönen, P. Kehusmaa, K. Muinonen. Asteroid shape and spin statistics from convex models. Icarus, Elsevier, 2008, 198 (1), pp.91. 10.1016/j.icarus.2008.07.014. hal-00499092 HAL Id: hal-00499092 https://hal.archives-ouvertes.fr/hal-00499092 Submitted on 9 Jul 2010 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Accepted Manuscript Asteroid shape and spin statistics from convex models J. Torppa, V.-P. Hentunen, P. Pääkkönen, P. Kehusmaa, K. Muinonen PII: S0019-1035(08)00283-2 DOI: 10.1016/j.icarus.2008.07.014 Reference: YICAR 8734 To appear in: Icarus Received date: 18 September 2007 Revised date: 3 July 2008 Accepted date: 7 July 2008 Please cite this article as: J. Torppa, V.-P. Hentunen, P. Pääkkönen, P. Kehusmaa, K. Muinonen, Asteroid shape and spin statistics from convex models, Icarus (2008), doi: 10.1016/j.icarus.2008.07.014 This is a PDF file of an unedited manuscript that has been accepted for publication. -
CURRICULUM VITAE, ALAN W. HARRIS Personal: Born
CURRICULUM VITAE, ALAN W. HARRIS Personal: Born: August 3, 1944, Portland, OR Married: August 22, 1970, Rose Marie Children: W. Donald (b. 1974), David (b. 1976), Catherine (b 1981) Education: B.S. (1966) Caltech, Geophysics M.S. (1967) UCLA, Earth and Space Science PhD. (1975) UCLA, Earth and Space Science Dissertation: Dynamical Studies of Satellite Origin. Advisor: W.M. Kaula Employment: 1966-1967 Graduate Research Assistant, UCLA 1968-1970 Member of Tech. Staff, Space Division Rockwell International 1970-1971 Physics instructor, Santa Monica College 1970-1973 Physics Teacher, Immaculate Heart High School, Hollywood, CA 1973-1975 Graduate Research Assistant, UCLA 1974-1991 Member of Technical Staff, Jet Propulsion Laboratory 1991-1998 Senior Member of Technical Staff, Jet Propulsion Laboratory 1998-2002 Senior Research Scientist, Jet Propulsion Laboratory 2002-present Senior Research Scientist, Space Science Institute Appointments: 1976 Member of Faculty of NATO Advanced Study Institute on Origin of the Solar System, Newcastle upon Tyne 1977-1978 Guest Investigator, Hale Observatories 1978 Visiting Assoc. Prof. of Physics, University of Calif. at Santa Barbara 1978-1980 Executive Committee, Division on Dynamical Astronomy of AAS 1979 Visiting Assoc. Prof. of Earth and Space Science, UCLA 1980 Guest Investigator, Hale Observatories 1983-1984 Guest Investigator, Lowell Observatory 1983-1985 Lunar and Planetary Review Panel (NASA) 1983-1992 Supervisor, Earth and Planetary Physics Group, JPL 1984 Science W.G. for Voyager II Uranus/Neptune Encounters (JPL/NASA) 1984-present Advisor of students in Caltech Summer Undergraduate Research Fellowship Program 1984-1985 ESA/NASA Science Advisory Group for Primitive Bodies Missions 1985-1993 ESA/NASA Comet Nucleus Sample Return Science Definition Team (Deputy Chairman, U.S. -
Hydrated Minerals on Asteroids: the Astronomical Record
Hydrated Minerals on Asteroids: The Astronomical Record A. S. Rivkin, E. S. Howell, F. Vilas, and L. A. Lebofsky March 28, 2002 Corresponding Author: Andrew Rivkin MIT 54-418 77 Massachusetts Ave. Cambridge MA, 02139 [email protected] 1 1 Abstract Knowledge of the hydrated mineral inventory on the asteroids is important for deducing the origin of Earth’s water, interpreting the meteorite record, and unraveling the processes occurring during the earliest times in solar system history. Reflectance spectroscopy shows absorption features in both the 0.6-0.8 and 2.5-3.5 pm regions, which are diagnostic of or associated with hydrated minerals. Observations in those regions show that hydrated minerals are common in the mid-asteroid belt, and can be found in unex- pected spectral groupings, as well. Asteroid groups formerly associated with mineralogies assumed to have high temperature formation, such as MAand E-class asteroids, have been observed to have hydration features in their reflectance spectra. Some asteroids have apparently been heated to several hundred degrees Celsius, enough to destroy some fraction of their phyllosili- cates. Others have rotational variation suggesting that heating was uneven. We summarize this work, and present the astronomical evidence for water- and hydroxyl-bearing minerals on asteroids. 2 Introduction Extraterrestrial water and water-bearing minerals are of great importance both for understanding the formation and evolution of the solar system and for supporting future human activities in space. The presence of water is thought to be one of the necessary conditions for the formation of life as 2 we know it. -
The Minor Planet Bulletin
THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 35, NUMBER 3, A.D. 2008 JULY-SEPTEMBER 95. ASTEROID LIGHTCURVE ANALYSIS AT SCT/ST-9E, or 0.35m SCT/STL-1001E. Depending on the THE PALMER DIVIDE OBSERVATORY: binning used, the scale for the images ranged from 1.2-2.5 DECEMBER 2007 – MARCH 2008 arcseconds/pixel. Exposure times were 90–240 s. Most observations were made with no filter. On occasion, e.g., when a Brian D. Warner nearly full moon was present, an R filter was used to decrease the Palmer Divide Observatory/Space Science Institute sky background noise. Guiding was used in almost all cases. 17995 Bakers Farm Rd., Colorado Springs, CO 80908 [email protected] All images were measured using MPO Canopus, which employs differential aperture photometry to determine the values used for (Received: 6 March) analysis. Period analysis was also done using MPO Canopus, which incorporates the Fourier analysis algorithm developed by Harris (1989). Lightcurves for 17 asteroids were obtained at the Palmer Divide Observatory from December 2007 to early The results are summarized in the table below, as are individual March 2008: 793 Arizona, 1092 Lilium, 2093 plots. The data and curves are presented without comment except Genichesk, 3086 Kalbaugh, 4859 Fraknoi, 5806 when warranted. Column 3 gives the full range of dates of Archieroy, 6296 Cleveland, 6310 Jankonke, 6384 observations; column 4 gives the number of data points used in the Kervin, (7283) 1989 TX15, 7560 Spudis, (7579) 1990 analysis. Column 5 gives the range of phase angles. -
Asteroid Photometric and Polarimetric Phase Curves: Joint Linear-Exponential Modeling
Meteoritics & Planetary Science 44, Nr 12, 1937–1946 (2009) Abstract available online at http://meteoritics.org Asteroid photometric and polarimetric phase curves: Joint linear-exponential modeling K. MUINONEN1, 2, A. PENTTILÄ1, A. CELLINO3, I. N. BELSKAYA4, M. DELBÒ5, A. C. LEVASSEUR-REGOURD6, and E. F. TEDESCO7 1University of Helsinki, Observatory, Kopernikuksentie 1, P.O. BOX 14, FI-00014 U. Helsinki, Finland 2Finnish Geodetic Institute, Geodeetinrinne 2, P.O. Box 15, FI-02431 Masala, Finland 3INAF-Osservatorio Astronomico di Torino, strada Osservatorio 20, 10025 Pino Torinese, Italy 4Astronomical Institute of Kharkiv National University, 35 Sumska Street, 61035 Kharkiv, Ukraine 5IUMR 6202 Laboratoire Cassiopée, Observatoire de la Côte d’Azur, BP 4229, 06304 Nice, Cedex 4, France 6UPMC Univ. Paris 06, UMR 7620, BP3, 91371 Verrières, France 7Planetary Science Institute, 1700 E. Ft. Lowell Road, Tucson, Arizona 85719, USA *Corresponding author. E-mail: [email protected] (Received 01 April, 2009; revision accepted 18 August 2009) Abstract–We present Markov-Chain Monte-Carlo methods (MCMC) for the derivation of empirical model parameters for photometric and polarimetric phase curves of asteroids. Here we model the two phase curves jointly at phase angles գ25° using a linear-exponential model, accounting for the opposition effect in disk-integrated brightness and the negative branch in the degree of linear polarization. We apply the MCMC methods to V-band phase curves of asteroids 419 Aurelia (taxonomic class F), 24 Themis (C), 1 Ceres (G), 20 Massalia (S), 55 Pandora (M), and 64 Angelina (E). We show that the photometric and polarimetric phase curves can be described using a common nonlinear parameter for the angular widths of the opposition effect and negative-polarization branch, thus supporting the hypothesis of common physical mechanisms being responsible for the phenomena. -
RASC Toronto Centre – the Sky This Month – June 4, 2014 to July 8, 2014 by Chris Vaughan
RASC Toronto Centre – www.rascto.ca The Sky This Month – June 4, 2014 to July 8, 2014 by Chris Vaughan NEWS Space Exploration – Public and Private Ref. http://www.spaceflightnow.com/tracking/index.html Launches June 11 pm - SpaceX Falcon 9 rocket from Cape Canaveral Air Force Station, Florida, payload six 2nd- generation Orbcomm comsats June 14 pm - Soyuz rocket from Plesetsk Cosmodrome, Russia, payload Glonass M navsat June 17 TBD - Orbital Science Antares rocket from Wallops Island, Virginia, payload 3rd Cygnus cargo freighter on 2nd operational flight to ISS June TBD - Ariane 5 rocket from Kourou, French Guiana, payload Measat 3b and Optus 10 comsats June TBD - Polar Sat Launch Vehicle from Satish Dhawan Space Center, Sriharikota, India, payload Spot 7 remote sensing sat June 19 pm - ICS Kosmotras Dnepr rocket from Dombarovsky, Russia, payload Earth observation sats June 20 pm - Proton rocket from Baikonur Cosmodrome, Kazakhstan, secretive payload reportedly known as Olymp or Luch June 25 TBD - Angara rocket from Plesetsk Cosmodrome, Russia, suborbital demonstration flight June 28 TBD - Soyuz rocket from Baikonur Cosmodrome, Kazakhstan, payload Meteor M2 weather sat and others July TBD - SpaceX Falcon 9 rocket from Cape Canaveral Air Force Station, Florida, payload AsiaSat 8 comsat July 1 am - United Launch Alliance Delta 2 rocket from Vandenberg Air Force Base, Ca, payload Orbiting Carbon Observatory 2 satellite for NASA New Hubble Ultra Deep Field 2014 Area between Fornax and Eridanus (RA. 3h32m38.5s Dec -27°47’00“). It’s comprised of ~600 hours of exposure, from July 2002 to Sep 2012. Hubble instruments include the Advanced Camera for Surveys (far-UV to visible) and the Wide Field Camera 3 (High res near-IR, visible, and near-UV). -
Hydrated Minerals on Asteroids 235
Rivkin et al.: Hydrated Minerals on Asteroids 235 Hydrated Minerals on Asteroids: The Astronomical Record A. S. Rivkin Massachusetts Institute of Technology E. S. Howell Arecibo Observatory F. Vilas NASA Johnson Space Center L. A. Lebofsky University of Arizona Knowledge of the hydrated mineral inventory on the asteroids is important for deducing the origin of Earth’s water, interpreting the meteorite record, and unraveling the processes occurring during the earliest times in solar system history. Reflectance spectroscopy shows absorption features in both the 0.6–0.8 and 2.5–3.5-µm regions, which are diagnostic of or associated with hydrated minerals. Observations in those regions show that hydrated minerals are common in the mid-asteroid belt, and can be found in unexpected spectral groupings as well. Asteroid groups formerly associated with mineralogies assumed to have high-temperature formation, such as M- and E-class asteroids, have been observed to have hydration features in their reflectance spectra. Some asteroids have apparently been heated to several hundred degrees Celsius, enough to destroy some fraction of their phyllosilicates. Others have rotational variation suggesting that heating was uneven. We summarize this work, and present the astronomical evidence for water- and hydroxyl-bearing minerals on asteroids. 1. INTRODUCTION to be common. Indeed, water is found throughout the outer solar system on satellites (Clark and McCord, 1980; Clark Extraterrestrial water and water-bearing minerals are of et al., 1984), Kuiper Belt Objects (KBOs) (Brown et al., great importance both for understanding the formation and 1997), and comets (Bregman et al., 1988; Brooke et al., 1989) evolution of the solar system and for supporting future as ice, and on the planets as vapor (Larson et al., 1975; human activities in space. -
Instructions and Helpful Info
Target NEOs! Instructions and Helpful Info. (Modified and updated from the OSIRIS-REx Target Asteroids! website at https://www.asteroidmission.org) May 2021 Prerequisites for participation. • An interest in astronomy. • An interest in observing and providing data to the scientific community. • An interest in learning more about asteroids and near-Earth objects. • Appropriate observing equipment or access to equipment. • Membership in the Astronomical League through a member club or as an individual Member- at-Large. Request a registration form from the coordinators. • Complete the Target NEOs! registration form. • Periodically you will receive updated information about the program. Obtain instrumentation. The minimum instrumentation recommended to participate in this project is: • Telescope 8” or larger; • CCD/CMOS Camera, computer with internet connection; and • Data reduction software (available via Target NEOs!) If you have an appropriate telescope and camera, you will be able to observe asteroids on the Target NEOs! list. The asteroids that can be observed depend on the telescope’s aperture (diameter of the mirror or lens), light pollution, geographic location, and asteroid’s location in the sky on a given night. If you do not have a telescope, you can still participate in the program by obtaining access to observing equipment: • Team up and use a telescope owned by a friend, astronomy club, local college or planetarium observatory. • Use a commercial telescope service. • Are you a member of a local astronomy club? If not, we recommend it! Local astronomy clubs provide connections and opportunities for observations. You will meet friendly members who will be happy to help you. Check out the Astronomical League and NASA Night Sky Network to locate a club near you. -
Spectroscopic Survey of M-Type Asteroids S
Spectroscopic survey of M-type asteroids S. Fornasier, B.E. Clark, E. Dotto, A. Migliorini, M. Ockert-Bell, M.A. Barucci To cite this version: S. Fornasier, B.E. Clark, E. Dotto, A. Migliorini, M. Ockert-Bell, et al.. Spectroscopic survey of M- type asteroids. Icarus, Elsevier, 2010, 210 (2), pp.655. 10.1016/j.icarus.2010.07.001. hal-00693813 HAL Id: hal-00693813 https://hal.archives-ouvertes.fr/hal-00693813 Submitted on 3 May 2012 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Accepted Manuscript Spectroscopic survey of M–type asteroids S. Fornasier, B.E. Clark, E. Dotto, A. Migliorini, M. Ockert-Bell, M.A. Barucci PII: S0019-1035(10)00273-3 DOI: 10.1016/j.icarus.2010.07.001 Reference: YICAR 9497 To appear in: Icarus Received Date: 11 September 2009 Revised Date: 1 July 2010 Accepted Date: 1 July 2010 Please cite this article as: Fornasier, S., Clark, B.E., Dotto, E., Migliorini, A., Ockert-Bell, M., Barucci, M.A., Spectroscopic survey of M–type asteroids, Icarus (2010), doi: 10.1016/j.icarus.2010.07.001 This is a PDF file of an unedited manuscript that has been accepted for publication. -
Astroboy®-70E Computerized Telescope
AstroBoy®-70e Computerized Telescope Instruction Manual 1 Table of Content Table of Content ............................................................................................................................. 2 1. AstroBoy®-70e Overview ........................................................................................................... 4 1.1. AstroBoy® features .............................................................................................................. 4 1.2. AstroBoy®-70e Assembly Terms......................................................................................... 5 2. Telescope Assembly ................................................................................................................... 6 3. GoToNova® 8404 Hand Controller ............................................................................................ 8 3.1. Key Description ................................................................................................................... 8 3.2. The LCD Screen .................................................................................................................. 8 4. Getting Started .......................................................................................................................... 10 4.1. Set the Telescope to PARK POSITION ............................................................................ 10 4.2. Setting Up the Hand Controller ......................................................................................... 10 4.3. -
DAMIT: a Database of Asteroid Models
A&A 513, A46 (2010) Astronomy DOI: 10.1051/0004-6361/200912693 & c ESO 2010 Astrophysics DAMIT: a database of asteroid models J. Durechˇ 1, V. Sidorin2, and M. Kaasalainen3 1 Astronomical Institute, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovickáchˇ 2, 18000 Prague, Czech Republic e-mail: [email protected] 2 Astronomical Institute, Academy of Sciences, Bocníˇ II, 14131 Prague, Czech Republic 3 Tampere University of Technology, PO Box 553, 33101 Tampere, Finland Received 15 June 2009 / Accepted 20 January 2010 ABSTRACT Context. Apart from a few targets that were directly imaged by spacecraft, remote sensing techniques are the main source of infor- mation about the basic physical properties of asteroids, such as the size, the spin state, or the spectral type. The most widely used observing technique – time-resolved photometry – provides us with data that can be used for deriving asteroid shapes and spin states. In the past decade, inversion of asteroid lightcurves has led to more than a hundred asteroid models. In the next decade, when data from all-sky surveys are available, the number of asteroid models will increase. Combining photometry with, e.g., adaptive optics data produces more detailed models. Aims. We created the Database of Asteroid Models from Inversion Techniques (DAMIT) with the aim of providing the astronomical community access to reliable and up-to-date physical models of asteroids – i.e., their shapes, rotation periods, and spin axis directions. Models from DAMIT can be used for further detailed studies of individual objects, as well as for statistical studies of the whole set. -
University Microfilms International 300 N
ASTEROID TAXONOMY FROM CLUSTER ANALYSIS OF PHOTOMETRY. Item Type text; Dissertation-Reproduction (electronic) Authors THOLEN, DAVID JAMES. Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 01/10/2021 21:10:18 Link to Item http://hdl.handle.net/10150/187738 INFORMATION TO USERS This reproduction was made from a copy of a docum(~nt sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of ti.e material submitted. The following explanation of techniques is provided to help clarify markings or notations which may ap pear on this reproduction. I. The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image alld duplicating adjacent pages to assure complete continuity. 2. When an image on the film is obliterated with a round black mark, it is an indication of either blurred copy because of movement during exposure, duplicate copy, or copyrighted materials that should not have been filmed. For blurred pages, a good image of the pagt' can be found in the adjacent frame.