Notes and News Results of the BAA Essay Competition
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Ice& Stone 2020
Ice & Stone 2020 WEEK 51: DECEMBER 13-19 Presented by The Earthrise Institute # 51 Authored by Alan Hale COMET OF THE WEEK: The Great Comet of 1680 Perihelion: 1680 December 18.49, q = 0.006 AU The Great Comet of 1680 over Rotterdam in The Netherlands, during late December 1680 as painted by the Dutch artist Lieve Verschuier. This particular comet was undoubtedly one of the brightest comets of the 17th Century, but it is also one of the most important comets in history from a scientific perspective, and perhaps even from the perspective of overall human history. While there were certainly plenty of superstitions attached to the comet’s appearance, the scientific investigations made of it were among the beginnings of the era in European history we now call The Enlightenment, and indeed, in a sense the Great Comet of 1680 can perhaps be considered as one of the sparks of that era. The significance began with the comet’s discovery, which was made on the morning of November 14, 1680, by a German astronomer residing in Coburg, Gottfried Kirch – the first comet ever to be discovered by means of a telescope. It was already around 4th magnitude at that time, and located near the star Regulus in the constellation Leo; from that point it traveled eastward and brightened rapidly, being closest to Earth (0.42 AU) on November 30. By that time it was a conspicuous naked-eye object with a tail 20 to 30 degrees long, and it remained visible for another week before disappearing into morning twilight. -
1950 Da, 205, 269 1979 Va, 230 1991 Ry16, 183 1992 Kd, 61 1992
Cambridge University Press 978-1-107-09684-4 — Asteroids Thomas H. Burbine Index More Information 356 Index 1950 DA, 205, 269 single scattering, 142, 143, 144, 145 1979 VA, 230 visual Bond, 7 1991 RY16, 183 visual geometric, 7, 27, 28, 163, 185, 189, 190, 1992 KD, 61 191, 192, 192, 253 1992 QB1, 233, 234 Alexandra, 59 1993 FW, 234 altitude, 49 1994 JR1, 239, 275 Alvarez, Luis, 258 1999 JU3, 61 Alvarez, Walter, 258 1999 RL95, 183 amino acid, 81 1999 RQ36, 61 ammonia, 223, 301 2000 DP107, 274, 304 amoeboid olivine aggregate, 83 2000 GD65, 205 Amor, 251 2001 QR322, 232 Amor group, 251 2003 EH1, 107 Anacostia, 179 2007 PA8, 207 Anand, Viswanathan, 62 2008 TC3, 264, 265 Angelina, 175 2010 JL88, 205 angrite, 87, 101, 110, 126, 168 2010 TK7, 231 Annefrank, 274, 275, 289 2011 QF99, 232 Antarctic Search for Meteorites (ANSMET), 71 2012 DA14, 108 Antarctica, 69–71 2012 VP113, 233, 244 aphelion, 30, 251 2013 TX68, 64 APL, 275, 292 2014 AA, 264, 265 Apohele group, 251 2014 RC, 205 Apollo, 179, 180, 251 Apollo group, 230, 251 absorption band, 135–6, 137–40, 145–50, Apollo mission, 129, 262, 299 163, 184 Apophis, 20, 269, 270 acapulcoite/ lodranite, 87, 90, 103, 110, 168, 285 Aquitania, 179 Achilles, 232 Arecibo Observatory, 206 achondrite, 84, 86, 116, 187 Aristarchus, 29 primitive, 84, 86, 103–4, 287 Asporina, 177 Adamcarolla, 62 asteroid chronology function, 262 Adeona family, 198 Asteroid Zoo, 54 Aeternitas, 177 Astraea, 53 Agnia family, 170, 198 Astronautica, 61 AKARI satellite, 192 Aten, 251 alabandite, 76, 101 Aten group, 251 Alauda family, 198 Atira, 251 albedo, 7, 21, 27, 185–6 Atira group, 251 Bond, 7, 8, 9, 28, 189 atmosphere, 1, 3, 8, 43, 66, 68, 265 geometric, 7 A- type, 163, 165, 167, 169, 170, 177–8, 192 356 © in this web service Cambridge University Press www.cambridge.org Cambridge University Press 978-1-107-09684-4 — Asteroids Thomas H. -
The Orbit of 2010 TK7. Possible Regions of Stability for Other Earth Trojan Asteroids
Astronomy & Astrophysics manuscript no. ForarXiv October 15, 2018 (DOI: will be inserted by hand later) The orbit of 2010 TK7. Possible regions of stability for other Earth Trojan asteroids R. Dvorak1, C. Lhotka2, L. Zhou3 1 Universit¨atssternwarte Wien, T¨urkenschanzstr. 17, A-1180 Wien, Austria, 2 D´epartment de Math´ematique (naXys), Rempart de la Vierge, 8, B-5000 Namur, Belgium, 3 Department of Astronomy & Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, Nanjing 210093, China Received; accepted Abstract. Recently the first Earth Trojan has been observed (Mainzer et al., ApJ 731) and found to be on an interesting orbit close to the Lagrange point L4 (Connors et al., Nature 475). In the present study we therefore perform a detailed investigation on the stability of its orbit and moreover extend the study to give an idea of the probability to find additional Earth–Trojans. Our results are derived using different approaches: a) we derive an analytical mapping in the spatial elliptic restricted three–body problem to find the phase space structure of the dynamical problem. We explore the stability of the asteroid in the context of the phase space geometry, including the indirect influence of the additional planets of our Solar system. b) We use precise numerical methods to integrate the orbit forward and backward in time in different dynamical models. Based on a set of 400 clone orbits we derive the probability of capture and escape of the Earth Trojan asteroids 2010 TK7. c) To this end we perform an extensive numerical investigation of the stability region of the Earth’s Lagrangian points. -
Jjmonl 1612.Pmd
alactic Observer GJohn J. McCarthy Observatory Volume 9, No. 12 December 2016 Water - the elusive elixir of life in the cosmos - Is it even closer than we thought? The John J. McCarthy Observatory Galactic Observer New Milford High School Editorial Committee 388 Danbury Road Managing Editor New Milford, CT 06776 Bill Cloutier Phone/Voice: (860) 210-4117 Production & Design Phone/Fax: (860) 354-1595 www.mccarthyobservatory.org Allan Ostergren Website Development JJMO Staff Marc Polansky It is through their efforts that the McCarthy Observatory Technical Support has established itself as a significant educational and Bob Lambert recreational resource within the western Connecticut Dr. Parker Moreland community. Steve Allison Tom Heydenburg Steve Barone Jim Johnstone Colin Campbell Carly KleinStern Dennis Cartolano Bob Lambert Route Mike Chiarella Roger Moore Jeff Chodak Parker Moreland, PhD Bill Cloutier Allan Ostergren Doug Delisle Marc Polansky Cecilia Detrich Joe Privitera Dirk Feather Monty Robson Randy Fender Don Ross Randy Finden Gene Schilling John Gebauer Katie Shusdock Elaine Green Paul Woodell Tina Hartzell Amy Ziffer In This Issue "OUT THE WINDOW ON YOUR LEFT"............................... 3 COMMONLY USED TERMS .............................................. 17 TAURUS-LITTROW .......................................................... 3 EARTH-SUN LAGRANGE POINTS & JAMES WEBB TELESCOPE 17 OVER THE TOP ............................................................... 4 REFERENCES ON DISTANCES ........................................ -
Looking for Lurkers: Objects Co-Orbital with Earth As SETI Observables
Looking for Lurkers: Objects Co-orbital with Earth as SETI Observables James Benford Microwave Sciences, 1041 Los Arabis Lane, Lafayette, CA 94549 USA [email protected] Abstract A recently discovered group of nearby co-orbital objects is an attractive location for extraterrestrial intelligence (ETI) to locate a probe to observe Earth while not being easily seen. These near-Earth objects provide an ideal way to watch our world from a secure natural object. That provides resources an ETI might need: materials, a firm anchor, concealment. These have been little studied by astronomy and not at all by SETI or planetary radar observations. I describe these objects found thus far and propose both passive and active observations of them as possible sites for ET probes. 1. Introduction Alien astronomy at our present technical level may have detected our biosphere many millennia ago. Perhaps one or more such alien civilization was drawn in recently, by radio signals emanating from our world. Or maybe it has resided in our solar system for centuries, millennia or longer. Long-lived robotic lurkers could have been sent to observe Earth long ago. If properly powered, and capable of self- repair (von Neumann probes), they could report science and intelligence bacK to their origin over very long time scales. Long-lived alien societies may do this to gather science for the larger communicating societies in our galaxy. I will call such a probe a ‘LurKer’, a hidden observing probe which may respond to an intentional signal and may not, depending on unKnown alien motivations. (Here Lurkers are assumed to be robotic.) Observing ‘nearer-Earth objects’ would explore the possibility that there are nearby ‘exotic’ probes that we could discover or excite. -
Study and Analysis of the Orbital and Physical Properties of 2010 TK7
Journal of Modern Physics, 2011, 2, 1351-1353 doi:10.4236/jmp.2011.211167 Published Online November 2011 (http://www.SciRP.org/journal/jmp) Study and Analysis of the Orbital and Physical Properties of 2010 TK7 Gianamar Giovannetti-Singh Science Faculty, Parkside Federation Academy, Cambridge, United Kingdom E-mail: [email protected] Received August 17, 2011; revised September 22, 2011; accepted October 10, 2011 Abstract In this paper we calculate the volume, mass, gravitational attraction to the Earth, angular momentum the or- bit of the Trojan asteroid (TK7) [1]. In this paper, we use classical Newtonian mechanics to analyse some of the physical and orbital properties of the Trojan asteroid, which are still experimentally unknown. The aster- oid should remain in Earth’s orbit for the next 100 years. We conclude by providing informed estimates of 2010 TK7’s yet unknown physical properties: i.e. mass, volume, gravitational attraction to Earth and angular momentum. Keywords: 2010 TK7, Trojan Asteroid, Universal Gravitation, Horseshoe Orbit, Angular Momentum Newton’s Laws of Motion 1. Introduction tion 5 concludes the paper discussing its results and pos- sible future uses. TK7 is located in the L4 Lagrangian point, 60˚ ahead of the Earth in orbit of the Sun, and was first observed in 2. Review of Literature on Trojan Asteroids October 2010 by NASA’s Wide-field Infrared Survey and Lagrangian Points Explorer (WISE) [2]. From the data received about TK7 from NASA’s 2010 TK7 was discovered in October 2010 by NASA’s WISE satellite we approximate the volume of TK7 as 8 3 satellite WISE. -
Neocam Is a Dual‐Channel Imager Operating in a Single Step‐And‐Stare Survey Mode
A Comprehensive Survey of the Solar System NEOCam is a dual‐channel imager operating in a single step‐and‐stare survey mode. •50 cm telescope •Two 16 megapixel HgCdTe focal planes at 4‐5.4 & 6‐10 m simultaneously imaged •Detectors passively cooled to 40K •Sun‐Earth L1 orbit • First proposed 2005: Category II •Awarded technology development funding in 2011 Discovery •Proposed to 2015 Discovery NEOCam Purpose • NEOCam is an exploration mission designed to find, track, and characterize small bodies throughout our solar system • It is optimized for NEO search and discovery, leveraging the experience from WISE/NEOWISE • We expect to discover ~100,000 new NEOs & millions of MBAs, a significant improvement on the number known today Optimized for NEOs & MBAs Orbit: Sun-Earth L1 Lagrange Point NEOCam Viewing Zones NEOWISE Viewing Zone • Close, constant distance from Earth allows full‐frame images to be downlinked • Thermal environment allows passive cooling to 40 K • Key enabling technology The Value of Studying Populations Credit: Scott Manley/Armaugh Observatory Surveys allow comparison of entire populations Albedos of Main Belt Asteroids Inclination (deg) Semi-major axis (AU) Surveys find the most unusual objects First known Earth Trojan NEOCam: A Powerful Method of Characterizing Populations All IR + radar (~2000) All NEOs discovered to date (~13,700) NEOCam (~100,000) NEOs All IR (~130,000) All MBAs discovered to date (~700,000) NEOCam (~2,000,000) MBAs All IR (~300) All non-sungrazer comets discovered to date (~2200) NEOCam (~4000) Comets -
Solar System B Answer Key
Northern Regional: January 19th, 2019 Solar System B Answer Key Name(s): _______________________________________________________________________ Team Name: ________________________________________ School Name: ________________________________________ Team Number: ___________ Rank: ___________ Score: ___________ Answer Key Part I: Written Test Dwarf Planets 1. A minor planet that "has sufficient mass for its self-gravity to overcome rigid-body forces so that it assumes a hydrostatic equilibrium or nearly round shape". (1 pt) 2. Eris, Pluto, Haumea, Makemake, Ceres (3 Points: All or nothing) 3. Ceres, Pluto, Haumea, Makemake, Eris (3 Points: All or nothing) 4. A minor planet is any object in the solar system that is classified neither as a planet or comet and directly orbits the Sun. (1pt) 5. Ceres (1pt) 6. C (1pt) , 7. Haumea; rotational period 4 hours; Hiʻiaka and Namaka (4 pts) 8. Makemake; one moon; Kuiper Belt (3 pts) 9. Ceres; orbits the Sun once every 4.6 Earth years; its day is about 9 hours. (3 pts) 10. Eris; methane ice; one moon (3pts) 11. Pluto; frozen nitrogen; Pluto is defined by many notable geologic features, including Sputnik planitia and the heart-shaped Tombaugh region. (4 pts) 12. C (1pt) 13. The Bright spots on the surface known are known as faculae and are composed of highly reflective salt which may be indicative of hydrogeological activity on Ceres. (3 pts) 14. Plutoids, or “ice dwarfs” are dwarf planets that are found outside the orbit of Neptune. Scientists suspect there that there may be up to 200 objects plutoids in the solar system. Four officially exist. (3 pts) 15. Charon, Styx, Nix, Kerberos, and Hydra. -
The Solar System
2 - 1 How Far Away Is It – The Solar System The Solar System {Abstract – In this segment of our video book, we cover distances inside our Solar System. We start out with a brief history beginning with how Nicolas Copernicus used planetary retrograde motion to help move us from the Earth-centric view to the Sun-centric view of our Solar System. We work our way through the contributions made by: Tycho Brahe and his detailed observations made with mural quadrants and sextants; Kepler and his mathematics of elliptical orbits; and Galileo with his observations using the newly invented telescope. We conclude this history with Newton and his theory of gravity. Gravity gives us the first opportunity to explain the inverse square law that will play such a central role in celestial distant measurements as we move out to the stars. We then explain planetary parallax as an extension to triangulation and use it to determine the distance to the Moon. We also illustrate all the additional information that becomes available once the distance is known, such as diameter, area and volume. Next, we take a look at the orbit of Mars and the Earth and the distance of Mars from the Sun, followed by distances of all the planets and dwarf planets from the Sun. During this segment we cover the major moons around each planet. We then focus on the Asteroid Belt. We explain Lagrange Points and cover Jupiter’s Trojan asteroids orbiting two of these points. This takes us to Earth’s Trojan asteroid, 2010 TK7. We then turn our attention to the Sun. -
Earth's Trojan Asteroid
Earth’s Trojan Asteroid Martin Connors1,2 , Paul Wiegert3 & Christian Veillet4 It was realized in 1772 that small bodies can stably share the orbit of a planet if they remain near ’triangular points‘ 60° ahead of or behind it in its orbit1. Such so-called “Trojan asteroids” have been found co-orbiting with Jupiter2, Mars3, and Neptune4. They have not hitherto been found associated with Earth5, where the viewing geometry poses difficulties, although other kinds of co-orbital asteroids (horseshoe orbiters6 and quasi-satellites7) asteroids have been observed8. Here we report the search of the archive of an infrared satellite for possible Earth Trojans, producing the candidate 2010 TK7. We subsequently made recovery observations, establishing that it is a Trojan companion of Earth, librating around the L4 (leading) Lagrange triangular point. Its orbit is stable over at least ~104 years. The existence of Trojan asteroids of other planets raises the question of whether such companions could exist for our planet. Despite studies showing that such bodies could be relatively stable5, and possibly wander relatively far from the Lagrange points9, they would dwell mostly in the daylight sky as seen from Earth, making detection difficult. Indeed they hitherto have never been observed. The launch of the Wide-field Infrared Survey Explorer (WISE) in 200910 provided improved viewing circumstances that enabled new detections of over 500 near- Earth objects16. WISE searched large areas of sky always 90º from the Sun, with high efficiency for asteroidal bodies, and good astrometric accuracy. Examining WISE discoveries in the expectation that Earth co-orbitals, possibly including a Trojan, could be found, resulted in two 1Athabasca University, 1 University Drive, Athabasca AB T9S 3A3, Canada. -
Earth's Trojan Asteroid
LETTER doi:10.1038/nature10233 Earth’s Trojan asteroid Martin Connors1,2, Paul Wiegert3 & Christian Veillet4 It was realized in 1772 that small bodies can stably share the same between Earth and L3. Interaction with Earth at the near-Earth end of orbit as a planet if they remain near ‘triangular points’ 606 ahead of the tadpole results in a rapid decrease in the object’s semimajor axis, a, or behind it in the orbit1. Such ‘Trojan asteroids’ have been found co- making it increase its angular speed (Kepler’s third law) and outpace orbiting with Jupiter2,Mars3 and Neptune4. They have not hitherto Earth. This is currently taking place. Slow resonant interaction at the been found associated with Earth, where the viewing geometry poses other parts of the tadpole increases a, making the object slow gradually difficulties for their detection5, although other kinds of co-orbital such that it again approaches Earth. In the current cycle, this will take 6 7 asteroid (horseshoe orbiters and quasi-satellites )havebeen place in the years AD 2050–2350, approximately. Repetition of this cycle observed8. Here we report an archival search of infrared data for leads to a sawtooth pattern in a as a function of time (Fig. 1c). possible Earth Trojans, producing the candidate 2010 TK7.Wesub- The present motion of 2010 TK7 is well established, but there are sequently made optical observations which established that 2010 inherent limits on our ability to compute orbits into the past or future. TK7 is a Trojan companion of Earth, librating around the leading Chaos limits the accuracy of computations of this asteroid’s position 18 Lagrange triangular point, L4. -
Centaurs Potentially in Retrograde Co-Orbit Resonance with Saturn Miao Li1, Yukun Huang1, and Shengping Gong1,?
Astronomy & Astrophysics manuscript no. _main c ESO 2018 July 5, 2018 Centaurs potentially in retrograde co-orbit resonance with Saturn Miao Li1, Yukun Huang1, and Shengping Gong1,? School of Aerospace Engineering, Tsinghua Universuty, Beijing, 100084, China e-mail: [email protected] Received XXX; accepted YYY ABSTRACT Aims. 2015 BZ509 is the first asteroid confirmed to be in retrograde co-orbit resonance (or 1/-1 resonance) with the giant planets in the solar system. While Saturn is the only giant planet whose Trojans are not discovered until now, we identify some small bodies among Centaurs and Damocloids that are potentially in 1/-1 resonance with Saturn in the present study. Methods. We integrate numerically the motion of the 1000 clones (include the nominal orbit) of each Centaur whose orbit has a semi- major axis between 9.3 au and 9.8 au and an inclination i > 90◦. To confirm and evaluate the 1/-1 resonant configurations mentioned above, we introduce an useful one degree integrable approximation for planar 1/-1 resonance. Results. We identify four candidates potentially in 1/-1 resonance with Saturn. The capture in this particular resonant state during the 40000 yr integration timespan is very common for 2006 RJ2 (906/1000 clones), 2006 BZ8 (878/1000 clones), and 2017 SV13 (998/1000 clones), and it is less likely for 2012 YE8 (426/1000 clones). According to our statistical results, 2006 RJ2 is the best candidate to be currently in a 1/-1 mean motion resonance with Saturn, and 2017 SV13 is another important potential candidate. Moreover, 2012 YE8 and 2006 BZ8 are also Centaurs of interest but their current and long-term 1/-1 resonant state with Saturn is less likely.