Asteroid Institute a Program of B612
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Cross-References ASTEROID IMPACT Definition and Introduction History of Impact Cratering Studies
18 ASTEROID IMPACT Tedesco, E. F., Noah, P. V., Noah, M., and Price, S. D., 2002. The identification and confirmation of impact structures on supplemental IRAS minor planet survey. The Astronomical Earth were developed: (a) crater morphology, (b) geo- 123 – Journal, , 1056 1085. physical anomalies, (c) evidence for shock metamor- Tholen, D. J., and Barucci, M. A., 1989. Asteroid taxonomy. In Binzel, R. P., Gehrels, T., and Matthews, M. S. (eds.), phism, and (d) the presence of meteorites or geochemical Asteroids II. Tucson: University of Arizona Press, pp. 298–315. evidence for traces of the meteoritic projectile – of which Yeomans, D., and Baalke, R., 2009. Near Earth Object Program. only (c) and (d) can provide confirming evidence. Remote Available from World Wide Web: http://neo.jpl.nasa.gov/ sensing, including morphological observations, as well programs. as geophysical studies, cannot provide confirming evi- dence – which requires the study of actual rock samples. Cross-references Impacts influenced the geological and biological evolu- tion of our own planet; the best known example is the link Albedo between the 200-km-diameter Chicxulub impact structure Asteroid Impact Asteroid Impact Mitigation in Mexico and the Cretaceous-Tertiary boundary. Under- Asteroid Impact Prediction standing impact structures, their formation processes, Torino Scale and their consequences should be of interest not only to Earth and planetary scientists, but also to society in general. ASTEROID IMPACT History of impact cratering studies In the geological sciences, it has only recently been recog- Christian Koeberl nized how important the process of impact cratering is on Natural History Museum, Vienna, Austria a planetary scale. -
7Th IAA Planetary Defense Conference – PDC 2021 26
7th IAA Planetary Defense Conference – PDC 2021 1 26-30 April 2021, Vienna, Austria IAA-PDC-21-11-37 Precautionary Planetary Defence Aaron C. Boley(1), Michael Byers(2) (1)(2)Outer Space Institute University of British Columbia 325-6224 Agricultural Road Vancouver, BC V6T 1Z1 Canada +1-604-827-2641 [email protected] Keywords: Asteroids, Precautionary Principle, Decision-Making, Active Management visiting the asteroid before the 2029 close approach Introduction: The question of whether to attempt leads us to ask, in a general sense, to what degree deflections during planetary defence emergencies has might restraint be prudent? been subject to considerable decision-making analysis As discussed by Chesley and Farnocchia (2021), if a (Schmidt 2018; SMPAG Ad-Hoc Working Group on Legal mission to an asteroid with a rich set of keyholes, like Issues 2020). Hypothetical situations usually involve a Apophis, goes awry and unintentionally collides with the newly discovered asteroid with a high impact probability asteroid, there is a risk that this will create a future on a set timescale. This paper addresses two further impact emergency. The publicity associated with the complexities: (1) limiting missions to an asteroid due to asteroid’s close approach could also prompt non-state the risk of a human-caused Earth impact; and (2) active actors to launch their own missions as technology management of asteroids to place them in “safe demonstrations and/or profile-raising exercises, much harbours”, even when impact risks are otherwise below like the infamous Tesla launch by SpaceX. “decision to act” thresholds. We use Apophis as a case Adding to these considerations is a potential traffic study, and address the two complexities in turn. -
Planetary Science Division Status Report
Planetary Science Division Status Report Jim Green NASA, Planetary Science Division January 26, 2017 Astronomy and Astrophysics Advisory CommiBee Outline • Planetary Science ObjecFves • Missions and Events Overview • Flight Programs: – Discovery – New FronFers – Mars Programs – Outer Planets • Planetary Defense AcFviFes • R&A Overview • Educaon and Outreach AcFviFes • PSD Budget Overview New Horizons exploresPlanetary Science Pluto and the Kuiper Belt Ascertain the content, origin, and evoluFon of the Solar System and the potenFal for life elsewhere! 01/08/2016 As the highest resolution images continue to beam back from New Horizons, the mission is onto exploring Kuiper Belt Objects with the Long Range Reconnaissance Imager (LORRI) camera from unique viewing angles not visible from Earth. New Horizons is also beginning maneuvers to be able to swing close by a Kuiper Belt Object in the next year. Giant IcebergsObjecve 1.5.1 (water blocks) floatingObjecve 1.5.2 in glaciers of Objecve 1.5.3 Objecve 1.5.4 Objecve 1.5.5 hydrogen, mDemonstrate ethane, and other frozenDemonstrate progress gasses on the Demonstrate Sublimation pitsDemonstrate from the surface ofDemonstrate progress Pluto, potentially surface of Pluto.progress in in exploring and progress in showing a geologicallyprogress in improving active surface.in idenFfying and advancing the observing the objects exploring and understanding of the characterizing objects The Newunderstanding of Horizons missionin the Solar System to and the finding locaons origin and evoluFon in the Solar System explorationhow the chemical of Pluto wereunderstand how they voted the where life could of life on Earth to that pose threats to and physical formed and evolve have existed or guide the search for Earth or offer People’sprocesses in the Choice for Breakthrough of thecould exist today life elsewhere resources for human Year forSolar System 2015 by Science Magazine as exploraon operate, interact well as theand evolve top story of 2015 by Discover Magazine. -
Lindley Johnson (NASA HQ) – NASA HEOMD – – NASA STMD – Tibor Balint (NASA HQ) – SSERVI – Greg Schmidt (NASA ARC) 19
September 4, 2014: Planetary Science Subcommittee Nancy Chabot, SBAG Chair 11th SBAG Meeting • July 29-31, 2014: Washington, DC • Highlights of SBAG meeting presentations from major projects • Discussion of findings • New steering committee members • Future meetings 1 NEOWISE Reac,va,on • Reac,vated in Dec 2013, NEOWISE is observing, discovering, and characterizing asteroids & comets using 3.4 and 4.6 µm channels • 7239 minor planets observed, including 157 near-Earth objects (NEOs). • 89 discoveries, including 26 NEOs and 3 comets. • NEO discoveries are large, dark • First data delivery from Reac9vaon: March 2015 to IRSA: • hp://irsa.ipac.caltech.edu/Missions/wise.html • All data from prime WISE/NEOWISE mission are publicly available through IRSA and team Comet P/2014 L2 NEOWISE papers; derived physical proper9es heading to PDS Dawn prepares to encounter Ceres PI: Alan Stern (SwRI) New Horizons Status PM: JHU-APL • Spacecraft is healthy & On-Course for Pluto (Radio) § 1.3x more fuel available for KBO Extended (High-E Plasma) NH Payload Mission phase than originally expected • Payload is healthy and well-calibrated § Finishing final Annual Checkout (ACO-8) • First Pluto OpNav Campaign conducted (UV Spectral) § See image below • Enter final Hibernation on Aug 29th (Vis-Color + IR Spectral) • Pluto Encounter begins on 2015-Jan-15 (Low-E Plasma) • Pluto Closest Approach: 2015-Jul-14 (Pan Imager) Intensive searches with ground-based facilities over the past Pluto OpNav Campaign: 2 years have not yet yielded a KBO target for NH. A 194- Cleanly separate Pluto & orbit Hubble program was started in June; below Charon shows the first potentially targetable KBO found. -
For Immediate Release
FOR IMMEDIATE RELEASE ASTRONAUTS, EXPERTS, AND SPACE AGENCIES DISCUSS ASTEROIDS, OPPORTUNITIES, AND RISKS ON ASTEROID DAY, 30 JUNE LUXEMBOURG, 22 June 2020 /PRNewswire/ -- The Asteroid Foundation returns with Asteroid Day LIVE Digital from Luxembourg. This year, the event is a fully digital celebration of asteroid science and exploration. Panel discussions and one-on-one interviews with astronauts and world experts will be broadcast on 30 June 2020. Each year Asteroid Day presents the public with a snap-shot of cutting-edge asteroid research from the largest telescopes on Earth to some of the most ambitious space missions. Topics of discussion this year include the acceleration in the rate of our asteroid discoveries and why it is set to accelerate even faster, the imminent arrival of samples from asteroid Ryugu and Bennu, the exciting preparations for the joint US-Europe mission to binary asteroid Didymos, and much more. Asteroids are the leftover remnants of the birth of the planets in the Solar System, and many are the shattered fragments of these diminutive proto-planets that never made it to maturity. “Asteroid exploration missions tell us about the birth of our own planet and reveal how asteroids can serve astronauts as stepping stones to Mars,” says Tom Jones, PhD, veteran astronaut and planetary scientist, and Asteroid Day Expert Panel member. Each asteroid is an individual with its own story to tell. And that’s what Asteroid Day is all about: bringing those stories to the widest audience possible. “Space and science have been an endless source of inspiration for SES! This is one of the reasons why we and our partners continue to do extraordinary things in space to deliver amazing experiences everywhere on earth,” says Ruy Pinto, Chief Technology Officer at SES. -
Destination Moon
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Radiation Forces on Small Particles in the Solar System T
1CARUS 40, 1-48 (1979) Radiation Forces on Small Particles in the Solar System t JOSEPH A. BURNS Cornell University, 2 Ithaca, New York 14853 and NASA-Ames Research Center PHILIPPE L. LAMY CNRS-LAS, Marseille, France 13012 AND STEVEN SOTER Cornell University, Ithaca, New York 14853 Received May 12, 1978; revised May 2, 1979 We present a new and more accurate expression for the radiation pressure and Poynting- Robertson drag forces; it is more complete than previous ones, which considered only perfectly absorbing particles or artificial scattering laws. Using a simple heuristic derivation, the equation of motion for a particle of mass m and geometrical cross section A, moving with velocity v through a radiation field of energy flux density S, is found to be (to terms of order v/c) mi, = (SA/c)Qpr[(1 - i'/c)S - v/c], where S is a unit vector in the direction of the incident radiation,/" is the particle's radial velocity, and c is the speed of light; the radiation pressure efficiency factor Qpr ~ Qabs + Q~a(l - (cos a)), where Qabs and Q~c~ are the efficiency factors for absorption and scattering, and (cos a) accounts for the asymmetry of the scattered radiation. This result is confirmed by a new formal derivation applying special relativistic transformations for the incoming and outgoing energy and momentum as seen in the particle and solar frames of reference. Qpr is evaluated from Mie theory for small spherical particles with measured optical properties, irradiated by the actual solar spectrum. Of the eight materials studied, only for iron, magnetite, and graphite grains does the radiation pressure force exceed gravity and then just for sizes around 0. -
Planetary Defence Activities Beyond NASA and ESA
Planetary Defence Activities Beyond NASA and ESA Brent W. Barbee 1. Introduction The collision of a significant asteroid or comet with Earth represents a singular natural disaster for a myriad of reasons, including: its extraterrestrial origin; the fact that it is perhaps the only natural disaster that is preventable in many cases, given sufficient preparation and warning; its scope, which ranges from damaging a city to an extinction-level event; and the duality of asteroids and comets themselves---they are grave potential threats, but are also tantalising scientific clues to our ancient past and resources with which we may one day build a prosperous spacefaring future. Accordingly, the problems of developing the means to interact with asteroids and comets for purposes of defence, scientific study, exploration, and resource utilisation have grown in importance over the past several decades. Since the 1980s, more and more asteroids and comets (especially the former) have been discovered, radically changing our picture of the solar system. At the beginning of the year 1980, approximately 9,000 asteroids were known to exist. By the beginning of 2001, that number had risen to approximately 125,000 thanks to the Earth-based telescopic survey efforts of the era, particularly the emergence of modern automated telescopic search systems, pioneered by the Massachusetts Institute of Technology’s (MIT’s) LINEAR system in the mid-to-late 1990s.1 Today, in late 2019, about 840,000 asteroids have been discovered,2 with more and more being found every week, month, and year. Of those, approximately 21,400 are categorised as near-Earth asteroids (NEAs), 2,000 of which are categorised as Potentially Hazardous Asteroids (PHAs)3 and 2,749 of which are categorised as potentially accessible.4 The hazards posed to us by asteroids affect people everywhere around the world. -
Enhanced Gravity Tractor Technique for Planetary Defense
4th IAA Planetary Defense Conference – PDC 2015 13-17 April 2015, Frascati, Roma, Italy IAA-PDC-15-04-11 ENHANCED GRAVITY TRACTOR TECHNIQUE FOR PLANETARY DEFENSE Daniel D. Mazanek(1), David M. Reeves(2), Joshua B. Hopkins(3), Darren W. Wade(4), Marco Tantardini(5), and Haijun Shen(6) (1)NASA Langley Research Center, Mail Stop 462, 1 North Dryden Street, Hampton, VA, 23681, USA, 1-757-864-1739, (2) NASA Langley Research Center, Mail Stop 462, 1 North Dryden Street, Hampton, VA, 23681, USA, 1-757-864-9256, (3)Lockheed Martin Space Systems Company, Mail Stop H3005, PO Box 179, Denver, CO 80201, USA, 1-303- 971-7928, (4)Lockheed Martin Space Systems Company, Mail Stop S8110, PO Box 179, Denver, CO 80201, USA, 1-303-977-4671, (5)Independent, via Tibaldi 5, Cremona, Italy, +393381003736, (6)Analytical Mechanics Associates, Inc., 21 Enterprise Parkway, Suite 300, Hampton, VA 23666, USA, 1-757-865-0000, Keywords: enhanced gravity tractor, in-situ mass augmentation, asteroid and comet deflection, planetary defense, low-thrust, high-efficiency propulsion, gravitational attraction, robotic mass collection Abstract Given sufficient warning time, Earth-impacting asteroids and comets can be deflected with a variety of different “slow push/pull” techniques. The gravity tractor is one technique that uses the gravitational attraction of a rendezvous spacecraft to the impactor and a low-thrust, high-efficiency propulsion system to provide a gradual velocity change and alter its trajectory. An innovation to this technique, known as the Enhanced Gravity Tractor (EGT), uses mass collected in-situ to augment the mass of the spacecraft, thereby greatly increasing the gravitational force between the objects. -
Deflecting a Hazardous Near-Earth Object 1St IAA Planetary Defense
Deflecting a Hazardous Near-Earth Object 1st IAA Planetary Defense Conference: Protecting Earth from Asteroids 27-30 April 2009 Granada, Spain D.K. Yeomans(1), S. Bhaskaran(1), S.B. Broschart(1), S.R. Chesley(1), P.W. Chodas(1), T. H. Sweetser(1), R. Schweickart(2) (1)JPL/Caltech 4800 Oak Grove Drive Pasadena, CA 91109, USA [email protected] ( 2)B612 Foundation 760 Fifth St. East Sonoma, CA 95476, USA [email protected] INTRODUCTION This short report on Near-Earth Object (NEO) hazard mitigation strategies was developed in response to a request for information by the U.S. National Research Council’s Space Sciences Board on December 17, 2008 and for the Planetary Defense Conference that took place 27-30 April 2009 in Granada Spain. Although we present example simulations for specific techniques that could be employed to deflect an Earth threatening NEO, our primary goal is to discuss some of the general principles and techniques that would be germane to all NEO deflection scenarios. This report summarizes work that was carried out in early 2009 and extends an earlier, more detailed study carried out in late 2008 [1]. STUDY OVERVIEW Because of the wide range of possible sizes, trajectories and warning times for Earth threatening NEOs, there will be a corresponding range in the levels of challenge in providing an appropriate mitigation response. Unless there are decades of warning time, hazardous NEOs larger than a few hundred meters in diameter may require large energies to deflect or fragment. In these cases, nuclear explosions, either stand- off or surface blasts, might provide a suitable response. -
Asteroid Retrieval Feasibility Study
Asteroid Retrieval Feasibility Study 2 April 2012 Prepared for the: Keck Institute for Space Studies California Institute of Technology Jet Propulsion Laboratory Pasadena, California 1 2 Authors and Study Participants NAME Organization E-Mail Signature John Brophy Co-Leader / NASA JPL / Caltech [email protected] Fred Culick Co-Leader / Caltech [email protected] Co -Leader / The Planetary Louis Friedman [email protected] Society Carlton Allen NASA JSC [email protected] David Baughman Naval Postgraduate School [email protected] NASA ARC/Carnegie Mellon Julie Bellerose [email protected] University Bruce Betts The Planetary Society [email protected] Mike Brown Caltech [email protected] Michael Busch UCLA [email protected] John Casani NASA JPL [email protected] Marcello Coradini ESA [email protected] John Dankanich NASA GRC [email protected] Paul Dimotakis Caltech [email protected] Harvard -Smithsonian Center for Martin Elvis [email protected] Astrophysics Ian Garrick-Bethel UCSC [email protected] Bob Gershman NASA JPL [email protected] Florida Institute for Human and Tom Jones [email protected] Machine Cognition Damon Landau NASA JPL [email protected] Chris Lewicki Arkyd Astronautics [email protected] John Lewis University of Arizona [email protected] Pedro Llanos USC [email protected] Mark Lupisella NASA GSFC [email protected] Dan Mazanek NASA LaRC [email protected] Prakhar Mehrotra Caltech [email protected] -
Planetary Defense: Near-Earth Objects, Nuclear Weapons, and International Law James A
Hastings International and Comparative Law Review Volume 42 Article 2 Number 1 Winter 2019 Winter 2019 Planetary Defense: Near-Earth Objects, Nuclear Weapons, and International Law James A. Green Follow this and additional works at: https://repository.uchastings.edu/ hastings_international_comparative_law_review Part of the Comparative and Foreign Law Commons, and the International Law Commons Recommended Citation James A. Green, Planetary Defense: Near-Earth Objects, Nuclear Weapons, and International Law, 42 Hastings Int'l & Comp.L. Rev. 1 (2019). Available at: https://repository.uchastings.edu/hastings_international_comparative_law_review/vol42/iss1/2 This Article is brought to you for free and open access by the Law Journals at UC Hastings Scholarship Repository. It has been accepted for inclusion in Hastings International and Comparative Law Review by an authorized editor of UC Hastings Scholarship Repository. Planetary Defense: Near-Earth Objects, Nuclear Weapons, and International Law BY JAMES A. GREEN ABSTRACT The risk of a large Near-Earth Object (NEO), such as an asteroid, colliding with the Earth is low, but the consequences of that risk manifesting could be catastrophic. Recent years have witnessed an unprecedented increase in global political will in relation to NEO preparedness, following the meteoroid impact in Chelyabinsk, Russia in 2013. There also has been an increased focus amongst states on the possibility of using nuclear detonation to divert or destroy a collision- course NEO—something that a majority of scientific opinion now appears to view as representing humanity’s best, or perhaps only, option in extreme cases. Concurrently, recent developments in nuclear disarmament and the de-militarization of space directly contradict the proposed “nuclear option” for planetary defense.