Temperature-Induced Effects and Phase Reddening on Near-Earth Asteroids
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The Minor Planet Bulletin
THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 36, NUMBER 3, A.D. 2009 JULY-SEPTEMBER 77. PHOTOMETRIC MEASUREMENTS OF 343 OSTARA Our data can be obtained from http://www.uwec.edu/physics/ AND OTHER ASTEROIDS AT HOBBS OBSERVATORY asteroid/. Lyle Ford, George Stecher, Kayla Lorenzen, and Cole Cook Acknowledgements Department of Physics and Astronomy University of Wisconsin-Eau Claire We thank the Theodore Dunham Fund for Astrophysics, the Eau Claire, WI 54702-4004 National Science Foundation (award number 0519006), the [email protected] University of Wisconsin-Eau Claire Office of Research and Sponsored Programs, and the University of Wisconsin-Eau Claire (Received: 2009 Feb 11) Blugold Fellow and McNair programs for financial support. References We observed 343 Ostara on 2008 October 4 and obtained R and V standard magnitudes. The period was Binzel, R.P. (1987). “A Photoelectric Survey of 130 Asteroids”, found to be significantly greater than the previously Icarus 72, 135-208. reported value of 6.42 hours. Measurements of 2660 Wasserman and (17010) 1999 CQ72 made on 2008 Stecher, G.J., Ford, L.A., and Elbert, J.D. (1999). “Equipping a March 25 are also reported. 0.6 Meter Alt-Azimuth Telescope for Photometry”, IAPPP Comm, 76, 68-74. We made R band and V band photometric measurements of 343 Warner, B.D. (2006). A Practical Guide to Lightcurve Photometry Ostara on 2008 October 4 using the 0.6 m “Air Force” Telescope and Analysis. Springer, New York, NY. located at Hobbs Observatory (MPC code 750) near Fall Creek, Wisconsin. -
Physical Properties of Near-Earth Asteroids
Planet. Space Sci., Vol. 46, No. 1, pp. 47-74, 1998 Pergamon N~I1998 Elsevier Science Ltd All rights reserved. Printed in Great Britain 00324633/98 $19.00+0.00 PII: SOO32-0633(97)00132-3 Physical properties of near-Earth asteroids D. F. Lupishko’ and M. Di Martino’ ’ Astronomical Observatory of Kharkov State University, Sumskaya str. 35, Kharkov 310022, Ukraine ‘Osservatorio Astronomic0 di Torino, I-10025 Pino Torinese (TO), Italy Received 5 February 1997; accepted 20 June 1997 rather small objects, usually of the order of a few kilo- metres or less. MBAs of such sizes are generally not access- ible to ground-based observations. Therefore, when NEAs approach the Earth (at distances which can be as small as 0.01-0.02 AU and sometimes less) they give a unique chance to study objects of such small sizes. Some of them possibly represent primordial matter, which has preserved a record of the earliest stages of the Solar System evolution, while the majority are fragments coming from catastrophic collisions that occurred in the asteroid main- belt and could provide “a look” at the interior of their much larger parent bodies. Therefore, NEAs are objects of special interest for sev- eral reasons. First, from the point of view of fundamental science, the problems raised by their origin in planet- crossing orbits, their life-time, their possible genetic relations with comets and meteorites, etc. are closely connected with the solution of the major problem of “We are now on the threshold of a new era of asteroid planetary science of the origin and evolution of the Solar studies” System. -
Observations from Orbiting Platforms 219
Dotto et al.: Observations from Orbiting Platforms 219 Observations from Orbiting Platforms E. Dotto Istituto Nazionale di Astrofisica Osservatorio Astronomico di Torino M. A. Barucci Observatoire de Paris T. G. Müller Max-Planck-Institut für Extraterrestrische Physik and ISO Data Centre A. D. Storrs Towson University P. Tanga Istituto Nazionale di Astrofisica Osservatorio Astronomico di Torino and Observatoire de Nice Orbiting platforms provide the opportunity to observe asteroids without limitation by Earth’s atmosphere. Several Earth-orbiting observatories have been successfully operated in the last decade, obtaining unique results on asteroid physical properties. These include the high-resolu- tion mapping of the surface of 4 Vesta and the first spectra of asteroids in the far-infrared wave- length range. In the near future other space platforms and orbiting observatories are planned. Some of them are particularly promising for asteroid science and should considerably improve our knowledge of the dynamical and physical properties of asteroids. 1. INTRODUCTION 1800 asteroids. The results have been widely presented and discussed in the IRAS Minor Planet Survey (Tedesco et al., In the last few decades the use of space platforms has 1992) and the Supplemental IRAS Minor Planet Survey opened up new frontiers in the study of physical properties (Tedesco et al., 2002). This survey has been very important of asteroids by overcoming the limits imposed by Earth’s in the new assessment of the asteroid population: The aster- atmosphere and taking advantage of the use of new tech- oid taxonomy by Barucci et al. (1987), its recent extension nologies. (Fulchignoni et al., 2000), and an extended study of the size Earth-orbiting satellites have the advantage of observing distribution of main-belt asteroids (Cellino et al., 1991) are out of the terrestrial atmosphere; this allows them to be in just a few examples of the impact factor of this survey. -
PDF Program Book
46th Meeting of the Division for Planetary Sciences with Historical Astronomy Division (HAD) 9-14 November 2014 | Tucson, AZ OFFICERS AND MEMBERS ........ 2 SPONSORS ............................... 2 EXHIBITORS .............................. 3 FLOOR PLANS ........................... 5 ATTENDEE SERVICES ................. 8 Session Numbering Key SCHEDULE AT-A-GLANCE ........ 10 100s Monday 200s Tuesday SUNDAY ................................. 20 300s Wednesday 400s Thursday MONDAY ................................ 23 500s Friday TUESDAY ................................ 44 Sessions are numbered in the program book by day and time. WEDNESDAY .......................... 75 All posters will be on display Monday - Friday THURSDAY.............................. 85 FRIDAY ................................. 119 Changes after 1 October are included only in the online program materials. AUTHORS INDEX .................. 137 1 DPS OFFICERS AND MEMBERS Current DPS Officers Heidi Hammel Chair Bonnie Buratti Vice-Chair Athena Coustenis Secretary Andrew Rivkin Treasurer Nick Schneider Education and Public Outreach Officer Vishnu Reddy Press Officer Current DPS Committee Members Rosaly Lopes Term Expires November 2014 Robert Pappalardo Term Expires November 2014 Ralph McNutt Term Expires November 2014 Ross Beyer Term Expires November 2015 Paul Withers Term Expires November 2015 Julie Castillo-Rogez Term Expires October 2016 Jani Radebaugh Term Expires October 2016 SPONSORS 2 EXHIBITORS Platinum Exhibitor Silver Exhibitors 3 EXHIBIT BOOTH ASSIGNMENTS 206 Applied -
Asteroid Regolith Weathering: a Large-Scale Observational Investigation
University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School 5-2019 Asteroid Regolith Weathering: A Large-Scale Observational Investigation Eric Michael MacLennan University of Tennessee, [email protected] Follow this and additional works at: https://trace.tennessee.edu/utk_graddiss Recommended Citation MacLennan, Eric Michael, "Asteroid Regolith Weathering: A Large-Scale Observational Investigation. " PhD diss., University of Tennessee, 2019. https://trace.tennessee.edu/utk_graddiss/5467 This Dissertation is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a dissertation written by Eric Michael MacLennan entitled "Asteroid Regolith Weathering: A Large-Scale Observational Investigation." I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the equirr ements for the degree of Doctor of Philosophy, with a major in Geology. Joshua P. Emery, Major Professor We have read this dissertation and recommend its acceptance: Jeffrey E. Moersch, Harry Y. McSween Jr., Liem T. Tran Accepted for the Council: Dixie L. Thompson Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) Asteroid Regolith Weathering: A Large-Scale Observational Investigation A Dissertation Presented for the Doctor of Philosophy Degree The University of Tennessee, Knoxville Eric Michael MacLennan May 2019 © by Eric Michael MacLennan, 2019 All Rights Reserved. -
ASTEROID SPECTROSCOPY and MINERALOGY 8:30 A.M
Lunar and Planetary Science XXXVI (2005) sess53.pdf Wednesday, March 16, 2005 ASTEROID SPECTROSCOPY AND MINERALOGY 8:30 a.m. Salon A Chairs: S. Erard L. A. McFadden 8:30 a.m. Gaffey M. J. * The Critical Importance of Data Reduction Calibrations in the Interpretability of S-type Asteroid Spectra [#1916] S-asteroid spectra are especially sensitive to distortion during the reduction of raw data to calibrated spectra. This can lead to major errors in mineralogical interpretations. Two major problems and the procedures to ameliorate them are discussed. 8:45 a.m. Sunshine J. M. * Bus S. J. Burbine T. H. McCoy T. J. Tracing Oxygen Fugacity in Asteroids and Meteorites Through Olivine Composition [#1203] We present new spectra of well-characterized olivine-rich meteorites and show that olivine Fa# can be accurately inferred from spectra. Using the same approach, new asteroid data are examined to infer the oxygen fugacity of olivine-rich asteroids. 9:00 a.m. Trigo-Rodríguez J. M. * Castro-Tirado A. J. Llorca J. Evidence of Hydrated 109P/Swift-Tuttle Meteoroids from Meteor Spectroscopy [#1485] Evidence for the possible presence of water in meteoroids released from comet 109P/Swift-Tuttle is presented. A Perseid fireball spectrum obtained during the 2004 campaign shows O and H lines, consistent with the presence of water in the mineral components of the meteoroid. 9:15 a.m. Emery J. P. * Cruikshank D. P. Van Cleve J. Stansberry J. A. Mineralogy of Asteroids from Observations with the Spitzer Space Telescope [#2072] Thermal emission measurements of the low-albedo Trojan asteroid 624 Hektor indicate a surface mineralogy of fine-grained silicates. -
~XECKDING PAGE BLANK WT FIL,,Q
1,. ,-- ,-- ~XECKDING PAGE BLANK WT FIL,,q DYNAMICAL EVIDENCE REGARDING THE RELATIONSHIP BETWEEN ASTEROIDS AND METEORITES GEORGE W. WETHERILL Department of Temcltricrl kgnetism ~amregie~mtittition of Washington Washington, D. C. 20025 Meteorites are fragments of small solar system bodies (comets, asteroids and Apollo objects). Therefore they may be expected to provide valuable information regarding these bodies. How- ever, the identification of particular classes of meteorites with particular small bodies or classes of small bodies is at present uncertain. It is very unlikely that any significant quantity of meteoritic material is obtained from typical ac- tive comets. Relatively we1 1-studied dynamical mechanisms exist for transferring material into the vicinity of the Earth from the inner edge of the asteroid belt on an 210~-~year time scale. It seems likely that most iron meteorites are obtained in this way, and a significant yield of complementary differec- tiated meteoritic silicate material may be expected to accom- pany these differentiated iron meteorites. Insofar as data exist, photometric measurements support an association between Apollo objects and chondri tic meteorites. Because Apol lo ob- jects are in orbits which come close to the Earth, and also must be fragmented as they traverse the asteroid belt near aphel ion, there also must be a component of the meteorite flux derived from Apollo objects. Dynamical arguments favor the hypothesis that most Apollo objects are devolatilized comet resiaues. However, plausible dynamical , petrographic, and cosmogonical reasons are known which argue against the simple conclusion of this syllogism, uiz., that chondri tes are of cometary origin. Suggestions are given for future theoretical , observational, experimental investigations directed toward improving our understanding of this puzzling situation. -
Bias-Corrected Population, Size Distribution, and Impact Hazard for the Near-Earth Objects ✩
Icarus 170 (2004) 295–311 www.elsevier.com/locate/icarus Bias-corrected population, size distribution, and impact hazard for the near-Earth objects ✩ Joseph Scott Stuart a,∗, Richard P. Binzel b a MIT Lincoln Laboratory, S4-267, 244 Wood Street, Lexington, MA 02420-9108, USA b MIT EAPS, 54-426, 77 Massachusetts Avenue, Cambridge, MA 02139, USA Received 20 November 2003; revised 2 March 2004 Available online 11 June 2004 Abstract Utilizing the largest available data sets for the observed taxonomic (Binzel et al., 2004, Icarus 170, 259–294) and albedo (Delbo et al., 2003, Icarus 166, 116–130) distributions of the near-Earth object population, we model the bias-corrected population. Diameter-limited fractional abundances of the taxonomic complexes are A-0.2%; C-10%, D-17%, O-0.5%, Q-14%, R-0.1%, S-22%, U-0.4%, V-1%, X-34%. In a diameter-limited sample, ∼ 30% of the NEO population has jovian Tisserand parameter less than 3, where the D-types and X-types dominate. The large contribution from the X-types is surprising and highlights the need to better understand this group with more albedo measurements. Combining the C, D, and X complexes into a “dark” group and the others into a “bright” group yields a debiased dark- to-bright ratio of ∼ 1.6. Overall, the bias-corrected mean albedo for the NEO population is 0.14 ± 0.02, for which an H magnitude of 17.8 ± 0.1 translates to a diameter of 1 km, in close agreement with Morbidelli et al. (2002, Icarus 158 (2), 329–342). -
Creation and Application of Routines for Determining Physical Properties of Asteroids and Exoplanets from Low Signal-To-Noise Data Sets
University of Central Florida STARS Electronic Theses and Dissertations, 2004-2019 2014 Creation and Application of Routines for Determining Physical Properties of Asteroids and Exoplanets from Low Signal-To-Noise Data Sets Nathaniel Lust University of Central Florida Part of the Astrophysics and Astronomy Commons, and the Physics Commons Find similar works at: https://stars.library.ucf.edu/etd University of Central Florida Libraries http://library.ucf.edu This Doctoral Dissertation (Open Access) is brought to you for free and open access by STARS. It has been accepted for inclusion in Electronic Theses and Dissertations, 2004-2019 by an authorized administrator of STARS. For more information, please contact [email protected]. STARS Citation Lust, Nathaniel, "Creation and Application of Routines for Determining Physical Properties of Asteroids and Exoplanets from Low Signal-To-Noise Data Sets" (2014). Electronic Theses and Dissertations, 2004-2019. 4635. https://stars.library.ucf.edu/etd/4635 CREATION AND APPLICATION OF ROUTINES FOR DETERMINING PHYSICAL PROPERTIES OF ASTEROIDS AND EXOPLANETS FROM LOW SIGNAL-TO-NOISE DATA-SETS by NATE B LUST B.S. University of Central Florida, 2007 A dissertation submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Physics in the Department of Physics in the College of Sciences at the University of Central Florida Orlando, Florida Fall Term 2014 Major Professor: Daniel Britt © 2014 Nate B Lust ii ABSTRACT Astronomy is a data heavy field driven by observations of remote sources reflecting or emitting light. These signals are transient in nature, which makes it very important to fully utilize every observation. -
Mineralogies and Source Regions of Near-Earth Asteroids ⇑ Tasha L
Icarus 222 (2013) 273–282 Contents lists available at SciVerse ScienceDirect Icarus journal homepage: www.elsevier.com/locate/icarus Mineralogies and source regions of near-Earth asteroids ⇑ Tasha L. Dunn a, , Thomas H. Burbine b, William F. Bottke Jr. c, John P. Clark a a Department of Geography-Geology, Illinois State University, Normal, IL 61790, United States b Department of Astronomy, Mount Holyoke College, South Hadley, MA 01075, United States c Southwest Research Institute, Boulder, CO 80302, United States article info abstract Article history: Near-Earth Asteroids (NEAs) offer insight into a size range of objects that are not easily observed in the Received 8 October 2012 main asteroid belt. Previous studies on the diversity of the NEA population have relied primarily on mod- Revised 8 November 2012 eling and statistical analysis to determine asteroid compositions. Olivine and pyroxene, the dominant Accepted 8 November 2012 minerals in most asteroids, have characteristic absorption features in the visible and near-infrared Available online 21 November 2012 (VISNIR) wavelengths that can be used to determine their compositions and abundances. However, formulas previously used for deriving compositions do not work very well for ordinary chondrite Keywords: assemblages. Because two-thirds of NEAs have ordinary chondrite-like spectral parameters, it is essential Asteroids, Composition to determine accurate mineralogies. Here we determine the band area ratios and Band I centers of 72 Meteorites Spectroscopy NEAs with visible and near-infrared spectra and use new calibrations to derive the mineralogies 47 of these NEAs with ordinary chondrite-like spectral parameters. Our results indicate that the majority of NEAs have LL-chondrite mineralogies. -
Yrfthesis.Pdf
ABSTRACT Title of Dissertation PHYSICAL PROPERTIES OF COMETARY NUCLEI Yanga Rolando Fernandez Do ctor of Philosophy Dissertation directed by Professor Michael F AHearn Department of Astronomy I present results on the physical and thermal prop erties of six cometary nuclei This is a signicant increase in the numb er of nuclei for which physical information is available I have used imaging of the thermal continuum at midinfrared and radio wavelengths and of the scattered solar continuum at optical wavelengths to study the eective radius reectivity rotation state and temp erature of these ob jects Traditionally the nucleus has b een dicult to observe owing to an obscuring coma or extreme faintness I have taken advantage of new midinfrared array detectors to observe more comets than were p ossible b efore I have also codevelop ed a technique to separate the coma and nucleus from a comet image I develop ed a simple mo del of the thermal b ehavior of a cometary nucleus to help interpret the thermal ux measurements the mo del is an extension to the Standard Thermal Mo del for aster oids We have enough nuclei now to see the rst demarcations of the cometary region on an alb edodiameter plot I make a comparison of the cometary nuclei with outer Solar System small b o dies and nearEarth asteroids All of the cometary nuclei studied in this thesis are dark with geometric alb edos b elow and have eective diameters of around to km except for comet HaleBopp C O which is in the next order of magnitude higher I give an extensive discussion of the nuclear -
Many Binaries Among Neas D
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by CERN Document Server Many binaries among NEAs D. Polishook a,b,* and N. Brosch b a Department of Geophysics and Planetary Sciences, Tel-Aviv University, Israel. b The Wise Observatory and the School of Physics and Astronomy, Tel-Aviv University, Israel. * Corresponding author: David Polishook, [email protected] The number of binary asteroids in the near-Earth region might be significantly higher than expected. While Bottke and Melosh (1996) suggested that about 15% of the NEAs are binaries, as indicated from the frequency of double craters, and Pravec and Harris (2000) suggested that half of the fast-rotating NEAs are binaries, our recent study of Aten NEA lightcurves shows that the fraction of binary NEAs might be even higher than 50%. We found two asteroids with asynchronous binary characteristics such as two additive periods and fast rotation of the primary fragment. We also identified three asteroids with synchronous binary characteristics such as amplitude higher than one magnitude, U-shaped lightcurve maxima and V-shaped lightcurve minima. These five binaries were detected out of a sample of eight asteroids observed, implying a 63% binarity frequency. Confirmation of this high binary population requires the study of a larger representative sample. However, any mitigation program that requires the deflection or demise of a potential impactor will have to factor in the possibility that the target is a binary or multiple asteroid system. Introduction This technique is best used for binaries with NEAs mitigation techniques are asynchronous periods where the different suggested with reference to objects size, frequencies are easily noticed.