A Absolute Magnitude, 150, 172, 185–186, 201, 304, 358, 390

Total Page:16

File Type:pdf, Size:1020Kb

A Absolute Magnitude, 150, 172, 185–186, 201, 304, 358, 390 Index A B Absolute magnitude, 150, 172, 185–186, 201, (298) Baptistina, 188 304, 358, 390 Binary systems, 271, 282, 324–325, 329, 435, Absorption bands, 237, 243, 246 463, 477, 481, 483, 490–491, 503, Achilles, 199 506–508 Action-angle variables, 3–4, 20, 23–27, 29, 34, 36, 38–39, 54, 60, 96 C Adiabatic invariant, 1, 40 Canonical transformation, 3, 5, 10–11, 15–16, Albedo, 77, 146, 150, 152, 159, 172, 184–186, 23, 30–31, 39, 50, 60 238, 242, 275, 282, 295, 297–298, Capture, 1–61, 121, 324, 341, 344, 353, 359, 301, 331 369–370, 386, 390–395, 489 Andoyer’s variables, 45, 47–48 of comets, 341 Angular momentum, 46–47, 51, 181–182, 203, Carbonaceous chondrites, 235 289, 329, 343, 348, 355, 365, 370, 375, Cartesian coordinates, 5, 19, 31, 48, 60, 325, 378, 380–382, 384, 387, 408, 418, 433, 380, 406 464–466, 468, 476 Catastrophic Aphelion distance, 342, 344, 346–347, 353, collisions, 140, 153, 231–232, 237 368 disruption, 153, 163, 165, 183, 223, 239 Area, 3, 23–25, 33–35, 38–43, 45, 69, 106, Centaur, 261, 324, 332, 341, 343–344, 216, 262–264, 266, 280–281, 283, 289, 353–354, 361, 387, 394 312, 325, 327, 332, 411–412, 414, 422, Central bulk, 403 489, 496–497, 504, 507–508 Chaos, 63–68, 73, 92, 116–120, 229, 324, 360 Area-preserving map, 69 Chaos indicators Argument of perihelion, 141, 163, 342, fast Lyapunov indicator (FLI), 63, 67–68, 380–382, 385, 407, 409–411, 437, 464, 117, 484 471–472, 503 generalized alignment index (GALI), Arnold, 222 67–68, 117–119 Asteroid relative Lyapunov indicator (RLI), 117, 484 collisions, 232 Chaotic showers, 166–172 diffusion, 393 families, 138, 140–141, 153, 155, 157–158, motion, 65, 74, 167, 484–485, 491–492, 160, 162, 173–177, 183, 187–188, 191, 494, 498 223, 229–230, 232, 234–235, 239, 248 orbit, 66–67, 73–74, 76, 96–99, 116–119, Astrometry, 251, 258, 300, 305 484–485, 502 Asymmetric equilibria, 44–45 system, 65–66 Attractor, 98–99, 120 Characteristic exponent, 63–129, 484 Autonomous Hamiltonian system, 66, 68–73, Chicxulub crater, 188 87, 89 Circular restricted three-body problem, 209, Averaged Hamiltonian, 50–51, 382, 407–408 211, 221, 346, 363–364, 367 Souchay, J., Dvorak, R. (eds.): Index. Lect. Notes Phys. 790, 511–517 (2010) DOI 10.1007/978-3-642-04458-8 c Springer-Verlag Berlin Heidelberg 2010 512 Index Circulation, 18, 22–24, 27, 40, 43, 382, 385, transit, 261, 263–264, 266, 277, 348, 468, 470 367, 482 Classical Impulse Approximation, 376, 416 Deviation vector, 67–73, 75, 90–96, 100–101, Classical Kuiper Belt, 389, 393 105–111, 117–123 Close encounters, 167, 170, 179, 201, 298–299, Diameter, 149–150, 156, 164, 179, 185, 188, 301, 342, 344, 346, 351, 360–361, 232, 236, 239, 256, 273–276, 301, 303 363–369, 371, 373–374, 376–377, Differentiated parent body, 235 379–380, 386, 418, 427, 435–436, Direct method, 121–123, 231 459–460 Direct perturbations, 344–345, 373–374 Coalescence, 231 Discrete dynamical system, 64, 89, 110 CODAM, 242, 245, 248 Discrete method, 110 Collisional disruption, 140–141, 231 Disk tide, 380–383, 386, 402 Collisionally relaxed population, 153, 159 Dissipative system, 66, 68, 75–76, 98, 120–123 Comet Dohnanyi, 153, 159, 161 activity of, 271, 341–342, 351–354, 358 Dora family, 149–150 Halley-type, 344–346, 348–350, 392 D/Shoemaker-Levy, 9, 344, 368 long-period, 344–345, 350, 354–355, Dynamical astronomy, 431–477 357–358, 360, 370, 375, 379, 384, 391 Dynamical families, 137–191, 223, 297 new comets, 344, 355–356, 358, 371, Dynamical lifetime, 168, 172, 181 382–383, 387, 390–392, 402, 424, 427 Dynamical system, 32, 39, 64–70, 73, 76–78, Oort cloud, 343, 345, 360, 372, 376, 85–87, 89, 91–92, 110–111, 116–117, 380–382, 386, 389–392, 401–428 139, 320, 433, 455 orbits, 341–342, 345, 356, 360, 370, 373, with divided phase space, 120 376, 384, 403 returning, 355–358 E short-period, 342, 345–350, 352–353, 358, Earth, 48, 55–57, 59, 61, 148, 152, 166, 168, 360, 384–385, 390, 395 170–171, 179, 197–198, 201–202, Shower, 345, 379, 391, 402, 418, 422, 424, 232–233, 247, 255–256, 261–263, 427 278–279, 281, 292, 297, 307, 313–314, Cometary fading, 354–355, 358 316–317, 324, 332, 365–366, 379, 387, Completeness limit, 154, 159–162 389–390, 433, 435, 481–483, 501, Condition R, 84–86, 89 503–506 Cone technique, 111 Eccentricity, 189, 495, 498 Conservative system, 66, 76, 100, 120 Edgeworth-Kuiper Belt, 344 Continuous dynamical system, 64, 86, 110–111 Ejection velocities, 141, 182–184 Continuous method, 66, 110, 115–116 Elis Stromgren,¨ 354 Cosmic rays exposure, 172, 180–181 Elliptic function of the first kind, 408 Cretaceous, 188, 232 Embedded cluster, 389 Encounter velocity, 348–349, 363–366, D 375, 419 D/1770 L1 (Lexell), 345, 370 Energy integral, 346, 381, 433 D’Alembert characteristic, 7–8 Eos family, 151–152, 183, 235 Datura cluster, 232, 238–239 Equilateral, 196–198, 201, 204–222, 224 Delaunay’s elements, 406–407 Equilibria, 18, 22–23, 31–35, 44–45, 51, Delay coordinates, 121 59–61, 198–199, 220 Democratic heliocentric variables, 461 Equilibrium, 18, 27–29, 31–34, 40, 45, 51–54, Dendrogram, 144 196–198, 203–204, 216–221, 256, 289 Detection methods Ernst Opik,¨ 364 astrometric measurements, 271, 302, 482 Escape velocity, 364, 365 direct imaging, 482 Euler, 46, 198, 306, 479 gravitational lensing, 482 Eunomia family, 159–160, 162, 235 radial velocity measurements, Exocatalogue, 484, 486, 503 481–482, 499 Explicit one-step methods, 436 Index 513 Exponential divergence of nearby orbits, 67, Generating function, 38–39 73–74, 92 Genetic algorithm, 290–296, 315 Exterior algebra, 68, 123–129 Giant Molecular Cloud, 375, 386, 402, 426 Extrapolation method Gliese 86, 481, 491, 497–500, 503, 506 Aitken-Neville scheme, 444, 447 GMC encounters, 387 Bulirsh-Stoer, 240, 320, 436, 443–448, (6489) Golevka, 179, 294–295 460, 463–464, 466–469, 471–472, Gram-Schmidt orthonormalization, 75, 103, 474–477, 480 105–108, 110 Extra-solar planets, 252, 315, 325, 481–508 Gravitational perturbations, 139, 202, 222, 307 F resonance, 1, 55–61 Families, identification, 137, 145, 248 scattering, 342, 386, 388 Filtration, 80, 91 Guiding trajectory, 39–40 Finite-dimensional dynamical system, 66 Finite time mLCE, 93, 119 H Finite time p-mLCE, 100 Habitable zone, 483, 499–508 Fixed point, 120, 211–212, 215–216, Hale-Bopp, 352 218–221, 271 Hamiltonian Flora family, 188, 234 equations of motion, 68, 71–72, 92, 95, Flux 105, 109 background flux, 356, 421, 427 formalism, 1–2, 5, 58–59, 72, 406 Fragments, 140–141, 148, 153–156, 158, N-body, gravitational, 431, 435–436, 439, 163–164, 167, 171–173, 176–177, 183, 455, 476 187–188, 231, 237, 240, 289 Hamilton–Jacobi, 3, 38 Fundamental matrix, 70 Harmonic oscillator, 27–28, 210 Fundamental model of resonance, 14, 20, HD41004 AB, 481, 491–492, 499–501, 503 29–37, 40, 42–44 Hector, 199 HED achondrites, 148 G Henon–Heiles´ system, 70, 75 Gaia, 191, 202, 251–333 Hierarchical Clustering Method (HCM), 142, Galactic 240 bulge, 381 Hill sphere, 197, 363, 367, 384 centre, 376, 380 HST, 272, 394 disk, 342, 355, 380–383, 386 Hybrid integrator, 459–464, 470 density, 406 Hydrocode, 177, 183–184, 232, 240 latitude, 382–383, 391, 402, 424–425 Hyperbolic deflection, 363–367, 377 mid-plane, 403–404, 406 normal component, 406 I potential, 404 Impact radial component, 406, 408, 410, 413–415 distance, 418 tide, 343–345, 360, 380–384, 386, energy, 172 390–391, 401–403, 407, 410, 416, 419, plane, 416 421–424, 426–427 Impulse approximation, 376–378, 415–416 Galaxy, 255, 357, 360, 381, 384, 401–404, 406 Inclination, 4–6, 18–19, 21, 48, 52, 54, 57, Gamma Cephei, 481, 491, 494–497 138–139, 145, 152, 167, 175, 179, 184, Gascheau, 198, 222 189–190, 211, 223–224, 230, 239, 262, Gas drag, 388–389 328–329, 331, 342, 344, 346–347, Gaston Fayet, 354 349–351, 353, 364, 368, 371–372, Gauss formulae, 140 379–381, 384–385, 387, 391–393, 411, Gaussian Gravitational Constant, 432, 449 434, 437, 464, 468, 482, 498, 503, 508 Gauss Radau Indirect perturbations, 344–345, 373–374 Quadratures, 440–443 Information dimension, 99 Spacings, 443 Inner core (Oort Cloud), 345, 379, 383, Gefion family, 171, 159, 166 387–388, 390, 424, 427 514 Index Integrability, 402, 408, 413–415 Liouville, 198 Integrable system, 91 Loss cone, 389 Integral of motion, 90, 98–99 Loss cylinder, 379, 382, 390–392 Interlopers, 149–150, 152, 191, 233–234, 240 L-type motion, 490 Interplanetary dust, 232, 240, 248 Lyapunov characteristic exponent of order p IRAS, 159, 232, 275 (p-LCE), 67, 79, 83, 86, 88–89, 100 Lyapunov characteristic exponents (LCEs), J 63–129 Jacobi integral, 346, 363 Lyapunov dimension, 64, 99 Jan Oort, 355 Lyapunov time, 92, 117 Jump, 43, 371 Jupiter M family, 342–343, 346, 348–351, 353, Main Belt, 7, 13, 44, 137–139, 141–144, 148, 358–359, 367–368, 379, 384, 390, 150–152, 159, 161–162, 166–167, 170, 392–394 178–182, 184–186, 189, 200, 230–233, -Saturn system, 504–505 235, 237–240, 261, 274–276, 281–282, 286, 292, 296–297, 324–327, 332, 334, K 379, 506 KAM, 221–222 Mapping, 69, 240, 344, 435–436, 449–450, Kaplan–Yorke conjecture, 99–100 456–458, 462–463, 470, 476 (832) Karin, 187, 239–241, 243–244, 248 Maria family, 165–166, 169 Karin cluster, 238–240 Markov chain, 371 Karin family, 187, 238–245, 248 Mars, 152, 179, 201, 224, 231–232, 298, 300, Kaula, 57 307, 310, 384–385, 503–505 Kepler Mars-crossers, 179 Orbital Elements, 434, 465, 474 Mature and fresh surfaces, 246 Problem, 431, 464–470 Max-e, 484, 504, 506–507 Kinetic energy, 47, 49, 172–173 Maximal Lyapunov characteristic exponent Kirkwood, 12, 44, 139, 148, 166–167, 180, (mLCE), 64–65, 67, 74–75, 82, 84, 507 91–98, 102, 116–119, 121–123, 484 gaps, 44, 139, 148, 166–167, 507 Maximal
Recommended publications
  • ISTS-2017-D-074ⅠISSFD-2017-074
    A look at the capture mechanisms of the “Temporarily Captured Asteroids” of the Earth By Hodei URRUTXUA1) and Claudio BOMBARDELLI2) 1)Astronautics Group, University of Southampton, United Kingdom 2)Space Dynamics Group, Technical University of Madrid, Spain (Received April 17th, 2017) Temporarily captured asteroids of the Earth are a newly discovered family of asteroids, which become naturally captured in the vicinity of the Earth for a limited time period. Thus, during the temporary capture these asteroids are in energetically favorable condi- tions, which makes them appealing targets for space missions to asteroids. Despite their potential interest, their capture mechanisms are not yet fully understood, and basic questions remain unanswered regarding the taxonomy of this population. The present work looks at gaining a better understanding of the key features that are relevant to the duration and nature of these asteroids, by analyzing patterns and extracting conclusions from a synthetic population of temporarily captured asteroids. Key Words: Asteroids, temporarily captured asteroids, capture dynamics, asteroid retrieval. Acronyms system. Asteroid 2006 RH120 is so far the only known mem- ber of this population, though statistical studies by Granvik et TCA : Temporarily captured asteroids al.12) support the evidence that such objects are actually com- TCO : Temporarily captured orbiters mon companions of the Earth, and thus it is expected that an TCF : Temporarily captured fly-bys increasing number of them will be found as survey technology improves.13) 1. Introduction During their temporary capture phase these asteroids are technically orbiting the Earth rather than the Sun, since their The origin of planetary satellites in the Solar System has Earth-binding energy is negative.
    [Show full text]
  • Abstract Volume
    T I I II I II I I I rl I Abstract Volume LPI LPI Contribution No. 1097 II I II III I • • WORKSHOP ON MERCURY: SPACE ENVIRONMENT, SURFACE, AND INTERIOR The Field Museum Chicago, Illinois October 4-5, 2001 Conveners Mark Robinbson, Northwestern University G. Jeffrey Taylor, University of Hawai'i Sponsored by Lunar and Planetary Institute The Field Museum National Aeronautics and Space Administration Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 LPI Contribution No. 1097 Compiled in 2001 by LUNAR AND PLANETARY INSTITUTE The Institute is operated by the Universities Space Research Association under Contract No. NASW-4574 with the National Aeronautics and Space Administration. Material in this volume may be copied without restraint for library, abstract service, education, or personal research purposes; however, republication of any paper or portion thereof requires the written permission of the authors as well as the appropriate acknowledgment of this publication .... This volume may be cited as Author A. B. (2001)Title of abstract. In Workshop on Mercury: Space Environment, Surface, and Interior, p. xx. LPI Contribution No. 1097, Lunar and Planetary Institute, Houston. This report is distributed by ORDER DEPARTMENT Lunar and Planetary institute 3600 Bay Area Boulevard Houston TX 77058-1113, USA Phone: 281-486-2172 Fax: 281-486-2186 E-mail: order@lpi:usra.edu Please contact the Order Department for ordering information, i,-J_,.,,,-_r ,_,,,,.r pA<.><--.,// ,: Mercury Workshop 2001 iii / jaO/ Preface This volume contains abstracts that have been accepted for presentation at the Workshop on Mercury: Space Environment, Surface, and Interior, October 4-5, 2001.
    [Show full text]
  • Week 5: January 26-February 1, 2020
    5# Ice & Stone 2020 Week 5: January 26-February 1, 2020 Presented by The Earthrise Institute About Ice And Stone 2020 It is my pleasure to welcome all educators, students, topics include: main-belt asteroids, near-Earth asteroids, and anybody else who might be interested, to Ice and “Great Comets,” spacecraft visits (both past and Stone 2020. This is an educational package I have put future), meteorites, and “small bodies” in popular together to cover the so-called “small bodies” of the literature and music. solar system, which in general means asteroids and comets, although this also includes the small moons of Throughout 2020 there will be various comets that are the various planets as well as meteors, meteorites, and visible in our skies and various asteroids passing by Earth interplanetary dust. Although these objects may be -- some of which are already known, some of which “small” compared to the planets of our solar system, will be discovered “in the act” -- and there will also be they are nevertheless of high interest and importance various asteroids of the main asteroid belt that are visible for several reasons, including: as well as “occultations” of stars by various asteroids visible from certain locations on Earth’s surface. Ice a) they are believed to be the “leftovers” from the and Stone 2020 will make note of these occasions and formation of the solar system, so studying them provides appearances as they take place. The “Comet Resource valuable insights into our origins, including Earth and of Center” at the Earthrise web site contains information life on Earth, including ourselves; about the brighter comets that are visible in the sky at any given time and, for those who are interested, I will b) we have learned that this process isn’t over yet, and also occasionally share information about the goings-on that there are still objects out there that can impact in my life as I observe these comets.
    [Show full text]
  • Lehigh Preserve Institutional Repository
    Lehigh Preserve Institutional Repository Particle Swarm Optimization of Low-Thrust, Geocentric-to-Halo-Orbit Transfers Abraham, Andrew 2014 Find more at https://preserve.lib.lehigh.edu/ This document is brought to you for free and open access by Lehigh Preserve. It has been accepted for inclusion by an authorized administrator of Lehigh Preserve. For more information, please contact [email protected]. Particle Swarm Optimization of Low-Thrust, Geocentric-to-Halo-Orbit Transfers by Andrew J. Abraham Presented to the Graduate and Research Committee of Lehigh University in Candidacy for the Degree of Doctor of Philosophy in Mechanical Engineering Lehigh University May, 2014 . Copyright by Andrew Abraham May, 2014 ii Approved and recommended for acceptance as a dissertation in partial fulfillment of the requirements for the degree of Doctor of Philosophy. ________________ Date _______________________ Professor Terry J. Hart Dissertation Adviser Mechanical Engineering Lehigh University ________________ Accepted Date _______________________ Dr. David B. Spencer Technical Adviser Aerospace Engineering The Pennsylvania State University _______________________ Dr. Nader Motee Committee Chairperson Mechanical Engineering Lehigh University _______________________ Dr. Philip A. Blythe Committee Member Mechanical Engineering Lehigh University _______________________ Dr. Gary G. DeLeo Committee Member Physics Lehigh University iii Acknowledgments Over the course of my graduate studies I have encountered many burdensome obstacles that I could not have overcome without significant help from family, friends, and advisers. I would like to take a moment to personally thank those who have helped make this dissertation a reality. First I would like to thank my parents for their support and encouragement during my graduate studies (especially low-cost housing). I would also like to thank my parents-in-law for their generous support as well.
    [Show full text]
  • Capturing Near Earth Objects*
    Capturing Near Earth Objects* Hexi Baoyin, Yang Chen, Junfeng Li Department of Aerospace Engineering, Tsinghua University 100084 Beijing, China Abstract: Recently, Near Earth Objects (NEOs) have been attracting great attention, and thousands of NEOs have been found to date. This paper examines the NEOs’ orbital dynamics using the framework of an accurate solar system model and a Sun-Earth-NEO three-body system when the NEOs are close to Earth to search for NEOs with low-energy orbits. It is possible for such an NEO to be temporarily captured by Earth; its orbit would thereby be changed and it would become an Earth-orbiting object after a small increase in its velocity. From the point of view of the Sun-Earth-NEO restricted three-body system, it is possible for an NEO whose Jacobian constant is slightly lower than C1 and higher than C3 to be temporarily captured by Earth. When such an NEO approaches Earth, it is possible to change its orbit energy to close up the zero velocity surface of the three-body system at point L1 and make the NEO become a small satellite of the Earth. Some such NEOs were found; the best example only required a 410m/s increase in velocity. Keywords: Near Earth Objects, temporary capture, restricted three-body system 1. Introduction Some Jovian comets, such as Oterma, are sometimes temporarily captured by Jupiter, making the transition from heliocentric orbits outside the orbit of Jupiter to heliocentric orbits inside the orbit of Jupiter. During this transition, Jupiter frequently captures the comet temporarily for one to several orbits (Koon et al.
    [Show full text]
  • On the Orbital Evolution of Meteoroid 2020 CD3, a Temporarily Captured Orbiter of the Earth–Moon System
    MNRAS 000,1–6 (2020) Preprint 8 April 2020 Compiled using MNRAS LATEX style file v3.0 On the orbital evolution of meteoroid 2020 CD3, a temporarily captured orbiter of the Earth–Moon system C. de la Fuente Marcos1? and R. de la Fuente Marcos2 1Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain 2AEGORA Research Group, Facultad de Ciencias Matemáticas, Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain Accepted 2020 March 19. Received 2020 March 19; in original form 2020 March 1 ABSTRACT Any near-Earth object (NEO) following an Earth-like orbit may eventually be captured by Earth’s gravity during low-velocity encounters. This theoretical possibility was first attested during the fly-by of 1991 VG in 1991–1992 with the confirmation of a brief capture episode —for about a month in 1992 February. Further evidence was obtained when 2006 RH120 was temporarily captured into a geocentric orbit from July 2006 to July 2007. Here, we perform a numerical assessment of the orbital evolution of 2020 CD3, a small NEO found recently that could be the third instance of a meteoroid temporarily captured by Earth’s gravity. We confirm that 2020 CD3 is currently following a geocentric trajectory although it will escape into a heliocentric path by early May 2020. Our calculations indicate that it was captured by +2 +4 the Earth in 2016−4, median and 16th and 84th percentiles. This episode is longer (4−2 yr) than that of 2006 RH120. Prior to its capture as a minimoon, 2020 CD3 was probably a NEO of the Aten type, but an Apollo type cannot be excluded; in both cases, the orbit was very Earth-like, with low eccentricity and low inclination, typical of an Arjuna-type meteoroid.
    [Show full text]
  • The Comet's Tale
    THE COMET’S TALE Newsletter of the Comet Section of the British Astronomical Association Number 29, 2010 January The Central Bureau for Astronomical Telegrams (CBAT) The Central Bureau for Astronomical Telegrams be supernovae, comets, novae and other unusual (CBAT) has recently celebrated the 125th anniversary variable stars, and satellites of minor planets and major since its founding by the editors of Astronomische planets – both discovery information and follow-up Nachrichten at Kiel, Germany, in late 1882. The information. Contributors also send information to the immediate cause was the sudden appearance of the CBAT regarding novae in other galaxies, and while great September sungrazing comet, for which a publication is generally made of novae in galaxies other coordinated worldwide center was seen to be much than M31, the CBAT webpage devoted to M31 novae needed, due to problems in getting proper information now appears satisfactorily to provide a venue for circulated quickly to the astronomical community. The designating and announcing new novae in that nearby CBAT moved to Copenhagen Observatory out of galaxy, with suitable follow-up observations also necessity during World War I, where it took on IAU provided there. Following discussion with IAU acceptance in 1922 (after an initial 2-year stint of an Commission 22 in Prague in 2006, reports on new IAU Central Bureau floundered in Brussels); the IAU's meteor showers also are now routinely published by the Central Bureau remained at Copenhagen until its CBAT. transfer to Cambridge at the start of 1965 (where Harvard College Observatory had maintained the The years 2006-2008 continued the marked transition western hemisphere's central bureau for astronomical toward the increased issuance of Central Bureau telegrams since 1883).
    [Show full text]
  • The Comet's Tale
    THE COMET’S TALE Newsletter of the Comet Section of the British Astronomical Association Volume 7, No 2 (Issue 14), 2000 October WHAT IS THE DIFFERENCE BETWEEN ASTEROIDS & COMETS? From Science-Week via CCNet astronomical units from the Sun, that astronomers should now perhaps due to the influence of consider these objects as members Other than the moons of the massive Jupiter just outside the of highly diverse family: the various planets, the chief small asteroid belt. Until recently, the small bodies of the Solar System. bodies of the solar system are shapes and surface features of comets and asteroids. asteroids were a matter of 2) If all comets were solid dirty conjecture; during the past balls of water ice, then their bulk In general, a comet is a decade, however, significant densities would be approximately kilometre-size chunk of ice and direct observations of asteroids 1 gram per cubic centimetre. But associated dust and debris. The have been relayed back to Earth some comets have apparent low- Oort cloud is an apparent from spacecraft. density structures that are made spherical shell of comets 10,000 from several bits held together by to 100,000 AU from the Sun and Classical astronomers have little more than their own self- the proposed source of comets categorised comets and asteroids gravity. This conclusion arose that orbit the Sun. The cloud is as distinctly different entities with after some comets were observed at the extreme edge of the Sun's different histories and to break up as a result of tidal influence, halfway to the nearest compositions, but recent evidence forces from either the Sun or star, and it is believed that when is blurring the conceptual Jupiter, and more than two dozen the cloud is perturbed by passing boundary between these two other comets have split apart for stars, comets may be sent into a groups of small Solar System no obvious reason at all.
    [Show full text]
  • Arxiv:1608.01518V2 [Astro-Ph.EP] 16 Aug 2016
    MNRAS 000, 1–16 (2016) Preprint 18 August 2016 Compiled using MNRAS LATEX style file v3.0 Asteroid (469219) 2016 HO3, the smallest and closest Earth quasi-satellite C. de la Fuente Marcos⋆ and R. de la Fuente Marcos Apartado de Correos 3413, E-28080 Madrid, Spain Accepted 2016 August 4. Received 2016 August 3; in original form 2016 June 12 ABSTRACT A number of Earth co-orbital asteroids experience repeated transitions between the quasi- satellite and horseshoe dynamical states. Asteroids 2001 GO2, 2002 AA29, 2003 YN107 and 2015 SO2 are well-documentedcases of such a dynamical behaviour. These transitions depend on the gravitational influence of other planets, owing to the overlapping of a multiplicity of secular resonances. Here, we show that the recently discovered asteroid (469219) 2016 HO3 is a quasi-satellite of our planet —the fifth one, joining the ranks of (164207) 2004 GU9, (277810) 2006 FV35, 2013 LX28 and 2014 OL339. This new Earth co-orbital also switches repeatedly between the quasi-satellite and horseshoe configurations. Its current quasi-satellite episode started nearly 100 yr ago and it will end in about 300 yr from now. The orbital solu- tion currently available for this object is very robust and our full N-body calculations show that it may be a long-term companion (time-scale of Myr) to our planet. Among the known Earth quasi-satellites, it is the closest to our planet and as such, a potentially accessible target for future in situ study. Due to its presumably lengthy dynamical relationship with the Earth and given the fact that at present and for many decades this transient object remains well positioned with respect to our planet, the results of spectroscopic studies of this small body, 26–115 m, may be particularly useful to improve our understanding of the origins —local or captured— of Earth’s co-orbital asteroid population.
    [Show full text]
  • Earth's Minimoons: Opportunities for Science and Technology
    Earth’s Minimoons: Opportunities for Science and Technology. Robert Jedicke 1;∗, Bryce T. Bolin 2, William F. Bottke 3, Monique Chyba 4, Grigori Fedorets 5, Mikael Granvik 6;5, Lynne Jones 2, and Hodei Urrutxua 7 1Institute for Astronomy, University of Hawai‘i, Honolulu, HI, USA 2Department of Astronomy, University of Washington, Seattle, WA 3Southwest Research Institute, Boulder, CO, USA 4Department of Mathematics, University of Hawai‘i, Honolulu, HI, USA 5Department of Physics, University of Helsinki, Helsinki, Finland 6Department of Computer Science, Electrical and Space Engineering, Lulea˚ University of Technology, Kiruna, Sweden 7Universidad Rey Juan Carlos, Madrid, Spain Correspondence*: Corresponding Author [email protected] ABSTRACT Twelve years ago the Catalina Sky Survey discovered Earth’s first known natural geocentric object other than the Moon, a few-meter diameter asteroid designated 2006 RH120. Despite significant improvements in ground-based telescope and detector technology in the past decade the asteroid surveys have not discovered another temporarily-captured orbiter (TCO; colloquially known as minimoons) but the all-sky fireball system operated in the Czech Republic as part of the European Fireball Network detected a bright natural meteor that was almost certainly in a geocentric orbit before it struck Earth’s atmosphere. Within a few years the Large Synoptic Survey Telescope (LSST) will either begin to regularly detect TCOs or force a re-analysis of the creation and dynamical evolution of small asteroids in the inner solar system. The first studies of the provenance, properties, and dynamics of Earth’s minimoons suggested that there should be a steady state population with about one 1- to 2-meter diameter captured objects at any time, with the number of captured meteoroids increasing exponentially for smaller sizes.
    [Show full text]
  • The Interplanetary Superhighway and the Origins Program
    The InterPlanetary Superhighway and the Origins Program Martin W. Lo Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Dr., 301/140L Pasadena, CA 91109 [email protected] Tunnels of the Lunar IPS Halo Orbit Around Earth L2 , Portal to the IPS Earth’s IPS Moon Approaching the Halo Orbit Portal Lunar L1 Lunar L2 Halo Halo Earth A Piece of Earth’s IPS Figure 1. Artist’s conception of portions of the InterPlanetary Superhighway (IPS, tubes) of the Sun-Earth-Moon System generated by the halo orbits (large periodic orbits around the unstable Lagrange Points L1, L2, and L3). Orbits on the blue- green tubes approach the halo orbits, while those on the red tubes go away from the halo orbits. Thus, the halo orbits are the portals, the literal “Highway Interchanges” to the Interplanetary Superhighway. The exploded view on the right is the Lunar portion of the Interplanetary Superhighway. Arrows indicate the direction of transport. Abstract—The origin of the universe and of life itself have TABLE OF CONTENTS been central to human inquiries since the dawn of 1. INTRODUCTION consciousness. To develop and use the technologies to 2. THE INTERPLANETARY SUPERHIGHWAY answer these timeless and profound questions is the mission 3. IPS TRAJECTORIES ENABLE ORIGINS MISSIONS of NASA’s Origins Program. The newly discovered 4. IPS ENABLES HUMAN SERVICE OF ORIGINS MISSIONS “InterPlanetary Superhighway” (IPS) by Lo and Ross [1], 5. IPS MODEL OF THE SOLAR SYSTEM [2] is a significant and cost-effective technology that can 6. IPS APPROACH TO PLANET DETECTION contribute to both Origins’ Science and Technology Goals.
    [Show full text]
  • Precovery Observations Confirm the Capture Time of Asteroid 2020 CD3 As Earth's Minimoon
    Precovery Observations Confirm the Capture Time of Asteroid 2020 CD3 as Earth's Minimoon Item Type Article; text Authors Naidu, S.P.; Micheli, M.; Farnocchia, D.; Roa, J.; Fedorets, G.; Christensen, E.; Weryk, R. Citation Naidu, S. P., Micheli, M., Farnocchia, D., Roa, J., Fedorets, G., Christensen, E., & Weryk, R. (2021). Precovery Observations Confirm the Capture Time of Asteroid 2020 CD3 as Earth’s Minimoon. Astrophysical Journal Letters, 913(1). DOI 10.3847/2041-8213/abf836 Publisher American Astronomical Society Journal Astrophysical Journal Letters Rights Copyright © 2021. The American Astronomical Society. All rights reserved. Download date 27/09/2021 10:25:25 Item License http://rightsstatements.org/vocab/InC/1.0/ Version Final published version Link to Item http://hdl.handle.net/10150/660909 The Astrophysical Journal Letters, 913:L6 (5pp), 2021 May 20 https://doi.org/10.3847/2041-8213/abf836 © 2021. The American Astronomical Society. All rights reserved. Precovery Observations Confirm the Capture Time of Asteroid 2020 CD3 as Earth’s Minimoon Shantanu P. Naidu1 , Marco Micheli2 , Davide Farnocchia1 , Javier Roa1 , Grigori Fedorets3 , Eric Christensen4, and Robert Weryk5 1 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, USA; [email protected] 2 ESA NEO Coordination Centre, Largo Galileo Galilei, 1, I-00044 Frascati (RM), Italy 3 Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, UK 4 The University of Arizona, Lunar and Planetary Laboratory, 1629 E. University Boulevard,Tucson, AZ 85721, USA 5 University of Hawai‘i, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, Hawai‘i, 96822, USA Received 2021 February 25; revised 2021 March 31; accepted 2021 March 31; published 2021 May 18 Abstract Asteroid 2020 CD3 was discovered on 2020 February 15 by the Catalina Sky Survey while it was temporarily captured in a geocentric orbit before escaping Earth’s Hill sphere on 2020 March 7.
    [Show full text]