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Observational Constraints on Surface Characteristics of Comet Nuclei
Observational Constraints on Surface Characteristics of Comet Nuclei Humberto Campins ([email protected] u) Lunar and Planetary Laboratory, University of Arizona Yanga Fernandez University of Hawai'i Abstract. Direct observations of the nuclear surfaces of comets have b een dicult; however a growing number of studies are overcoming observational challenges and yielding new information on cometary surfaces. In this review, we fo cus on recent determi- nations of the alb edos, re ectances, and thermal inertias of comet nuclei. There is not much diversity in the geometric alb edo of the comet nuclei observed so far (a range of 0.025 to 0.06). There is a greater diversity of alb edos among the Centaurs, and the sample of prop erly observed TNOs (2) is still to o small. Based on their alb edos and Tisserand invariants, Fernandez et al. (2001) estimate that ab out 5% of the near-Earth asteroids have a cometary origin, and place an upp er limit of 10%. The agreement between this estimate and two other indep endent metho ds provide the strongest constraint to date on the fraction of ob jects that comets contribute to the p opulation of near-Earth asteroids. There is a diversity of visible colors among comets, extinct comet candidates, Centaurs and TNOs. Comet nuclei are clearly not as red as the reddest Centaurs and TNOs. What Jewitt (2002) calls ultra-red matter seems to be absent from the surfaces of comet nuclei. Rotationally resolved observations of b oth colors and alb edos are needed to disentangle the e ects of rotational variability from other intrinsic qualities. -
KAREN J. MEECH February 7, 2019 Astronomer
BIOGRAPHICAL SKETCH – KAREN J. MEECH February 7, 2019 Astronomer Institute for Astronomy Tel: 1-808-956-6828 2680 Woodlawn Drive Fax: 1-808-956-4532 Honolulu, HI 96822-1839 [email protected] PROFESSIONAL PREPARATION Rice University Space Physics B.A. 1981 Massachusetts Institute of Tech. Planetary Astronomy Ph.D. 1987 APPOINTMENTS 2018 – present Graduate Chair 2000 – present Astronomer, Institute for Astronomy, University of Hawaii 1992-2000 Associate Astronomer, Institute for Astronomy, University of Hawaii 1987-1992 Assistant Astronomer, Institute for Astronomy, University of Hawaii 1982-1987 Graduate Research & Teaching Assistant, Massachusetts Inst. Tech. 1981-1982 Research Specialist, AAVSO and Massachusetts Institute of Technology AWARDS 2018 ARCs Scientist of the Year 2015 University of Hawai’i Regent’s Medal for Research Excellence 2013 Director’s Research Excellence Award 2011 NASA Group Achievement Award for the EPOXI Project Team 2011 NASA Group Achievement Award for EPOXI & Stardust-NExT Missions 2009 William Tylor Olcott Distinguished Service Award of the American Association of Variable Star Observers 2006-8 National Academy of Science/Kavli Foundation Fellow 2005 NASA Group Achievement Award for the Stardust Flight Team 1996 Asteroid 4367 named Meech 1994 American Astronomical Society / DPS Harold C. Urey Prize 1988 Annie Jump Cannon Award 1981 Heaps Physics Prize RESEARCH FIELD AND ACTIVITIES • Developed a Discovery mission concept to explore the origin of Earth’s water. • Co-Investigator on the Deep Impact, Stardust-NeXT and EPOXI missions, leading the Earth-based observing campaigns for all three. • Leads the UH Astrobiology Research interdisciplinary program, overseeing ~30 postdocs and coordinating the research with ~20 local faculty and international partners. -
Investigation of Dust and Water Ice in Comet 9P/Tempel 1 from Spitzer Observations of the Deep Impact Event
A&A 542, A119 (2012) Astronomy DOI: 10.1051/0004-6361/201118718 & c ESO 2012 Astrophysics Investigation of dust and water ice in comet 9P/Tempel 1 from Spitzer observations of the Deep Impact event A. Gicquel1, D. Bockelée-Morvan1 ,V.V.Zakharov1,2,M.S.Kelley3, C. E. Woodward4, and D. H. Wooden5 1 LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France e-mail: [adeline.gicquel;dominique.bockelee;vladimir.zakharov]@obspm.fr 2 Gordien Strato, France 3 Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA e-mail: [email protected] 4 Minnesota Institute for Astrophysics, University of Minnesota, 116 Church St SE, Minneapolis, MN 55455, USA e-mail: [email protected] 5 NASA Ames Research Center, Space Science Division, USA e-mail: [email protected] Received 22 December 2011 / Accepted 9 February 2012 ABSTRACT Context. The Spitzer spacecraft monitored the Deep Impact event on 2005 July 4 providing unique infrared spectrophotometric data that enabled exploration of comet 9P/Tempel 1’s activity and coma properties prior to and after the collision of the impactor. Aims. The time series of spectra take with the Spitzer Infrared Spectrograph (IRS) show fluorescence emission of the H2O ν2 band at 6.4 μm superimposed on the dust thermal continuum. These data provide constraints on the properties of the dust ejecta cloud (dust size distribution, velocity, and mass), as well as on the water component (origin and mass). Our goal is to determine the dust-to-ice ratio of the material ejected from the impact site. -
Capture of Interstellar Objects: a Source of Long-Period Comets
MNRAS 000,1–5 (2019) Preprint 7 January 2020 Compiled using MNRAS LATEX style file v3.0 Capture of interstellar objects: a source of long-period comets T. O. Hands1?, W. Dehnen2;3 1Institut f¨urComputergest¨utzteWissenschaften, Universit¨atZ¨urich, Winterthurerstrasse 190, 8057 Z¨urich, Switzerland 2Department of Physics & Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK 3Universit¨ats-Sternwarteder Ludwig-Maximilians-Universit¨at,Scheinerstrasse 1, M¨unchen D-81679, Germany 7 January 2020 ABSTRACT We simulate the passage through the Sun-Jupiter system of interstellar objects (ISOs) sim- ilar to 1I/‘Oumuamua or 2I/Borisov. Capture of such objects is rare and overwhelmingly from low incoming speeds onto orbits akin to those of known long-period comets. This sug- gests that some of these comets could be of extra-solar origin, in particular inactive ones. Assuming ISOs follow the local stellar velocity distribution, we infer a volume capture rate of 0:051au3yr−1. Current estimates for orbital lifetimes and space densities then imply steady- state captured populations of ∼ 102 comets and ∼ 105 ‘Oumuamua-like rocks, of which 0.033% are within 6 au at any time. Key words: comets:general – asteroids:general – celestial mechanics – minor planets, aster- oids: individual: 1I/‘Oumuamua – comets: individual: 2I/Borisov – Oort cloud 1 INTRODUCTION obvious cometary activity (see e.g., Guzik et al. 2019; Fitzsimmons et al. 2019). It was also discovered relatively early on its approach Comets have fascinated humanity for centuries. These exotic ob- to the Solar system, meaning we can expect further observations jects present what many believe to be an immaculate sample of the in the coming months. -
Perturbations in the Motion of the Quasicomplanar Minor Planets For
Publications of the Department of Astronom} - Beograd, N2 ID, 1980 UDC 523.24; 521.1/3 osp PERTURBATIONS IN THE MOTION OF THE QUASICOMPLANAR MI NOR PLANETS FOR THE CASE PROXIMITIES ARE UNDER 10000 KM J. Lazovic and M. Kuzmanoski Institute of Astronomy, Faculty of Sciences, Beograd Received January 30, 1980 Summary. Mutual gravitational action during proximities of 12 quasicomplanar minor pla nets pairs have been investigated, whose minimum distances were under 10000 km. In five of the pairs perturbations of several orbital elements have been stated, whose amounts are detectable by observations from the Earth. J. Lazovic, M. Kuzmanoski, POREMECAJI ELEMENATA KRETANJA KVAZIKOM PLANARNIH MALIH PLANETA U PROKSIMITETIMA NJIHOVIH PUTANJA SA DA LJINAMA MANJIM OD 10000 KM - Ispitali smo medusobna gravitaciona de;stva pri proksi mitetima 12 parova kvazikomplanarnih malih planeta sa minimalnim daljinama ispod 10000 km. Kod pet parova nadeni su poremecaji u vi~e putanjskih elemenata, ~iji bi se iznosi mogli ustano viti posmatranjima sa Zemlje. Earlier we have found out 13 quasicomplanar minor planets pairs (the angle I between their orbital planes less than O~500), whose minimum mutual distances (pmin) were less than 10000 km (Lazovic, Kuzmanoski, 1978). The shortest pro ximity distance of only 600 km among these pairs has been stated with minor planet pair (215) Oenone and 1851 == 1950 VA. The corresponding perturbation effects in this pair have been calculated (Lazovic, Kuzmanoski, 1979a). This motivated us to investigate the mutual perturbing actions in the 12 remaining minor planets pairs for the case they found themselves within the proximities of their correspon ding orbits. -
Ice& Stone 2020
Ice & Stone 2020 WEEK 33: AUGUST 9-15 Presented by The Earthrise Institute # 33 Authored by Alan Hale 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. -
Academic Zodiac & RTRRT Publications
Oh, look: it's full of stars! http://lulu.com/astrology The Happiness Formula is 22:16. First published by Klaudio Zic Publications, 2011 http://stores.lulu.com/astrology Copyright © 2011 By Klaudio Zic. All Rights Reserved. No part of this material may be reproduced or transmitted in any form or by any means, electronic or otherwise, for commercial purposes or otherwise, without the written permission of the Author. The names of dedicated publications are normally given in italics. Academic Zodiac & RTRRT Publications Copyright © 2011 by Klaudio Zic, all rights reserved. http://www.lulu.com/astrology Is there a happiness formula? If there is one, we believe we have found it. From time immemorial, we have been told to tell the truth in order to be happy forever after; well, here it is: your own true horoscope according to the original zodiac. If you were looking for truth, the search ends here: you have found the Academic Zodiac. Your true stars will help your original mind out of its frozen niche. A bit dusty after years of hibernation, your original self bursts open within a world of infinite possibilities. You can create and recreate events much as you can discreate the unwanted ones forever. Buss the slumbering princess, kiss the frog & prince charming and welcome to your enchanted kingdom full of goodies and birthright charms. Academic Zodiac & RTRRT Publications How does one find an appropriate publication? The publication of your own choice is found by searching the lulu.com site for relevant results. The helpful site inkmesh.com is particularly useful in determining price range, e.g. -
The British Astronomical Association Handbook 2017
THE HANDBOOK OF THE BRITISH ASTRONOMICAL ASSOCIATION 2017 2016 October ISSN 0068–130–X CONTENTS PREFACE . 2 HIGHLIGHTS FOR 2017 . 3 CALENDAR 2017 . 4 SKY DIARY . .. 5-6 SUN . 7-9 ECLIPSES . 10-15 APPEARANCE OF PLANETS . 16 VISIBILITY OF PLANETS . 17 RISING AND SETTING OF THE PLANETS IN LATITUDES 52°N AND 35°S . 18-19 PLANETS – EXPLANATION OF TABLES . 20 ELEMENTS OF PLANETARY ORBITS . 21 MERCURY . 22-23 VENUS . 24 EARTH . 25 MOON . 25 LUNAR LIBRATION . 26 MOONRISE AND MOONSET . 27-31 SUN’S SELENOGRAPHIC COLONGITUDE . 32 LUNAR OCCULTATIONS . 33-39 GRAZING LUNAR OCCULTATIONS . 40-41 MARS . 42-43 ASTEROIDS . 44 ASTEROID EPHEMERIDES . 45-50 ASTEROID OCCULTATIONS .. ... 51-53 ASTEROIDS: FAVOURABLE OBSERVING OPPORTUNITIES . 54-56 NEO CLOSE APPROACHES TO EARTH . 57 JUPITER . .. 58-62 SATELLITES OF JUPITER . .. 62-66 JUPITER ECLIPSES, OCCULTATIONS AND TRANSITS . 67-76 SATURN . 77-80 SATELLITES OF SATURN . 81-84 URANUS . 85 NEPTUNE . 86 TRANS–NEPTUNIAN & SCATTERED-DISK OBJECTS . 87 DWARF PLANETS . 88-91 COMETS . 92-96 METEOR DIARY . 97-99 VARIABLE STARS (RZ Cassiopeiae; Algol; λ Tauri) . 100-101 MIRA STARS . 102 VARIABLE STAR OF THE YEAR (T Cassiopeiæ) . .. 103-105 EPHEMERIDES OF VISUAL BINARY STARS . 106-107 BRIGHT STARS . 108 ACTIVE GALAXIES . 109 TIME . 110-111 ASTRONOMICAL AND PHYSICAL CONSTANTS . 112-113 INTERNET RESOURCES . 114-115 GREEK ALPHABET . 115 ACKNOWLEDGEMENTS / ERRATA . 116 Front Cover: Northern Lights - taken from Mount Storsteinen, near Tromsø, on 2007 February 14. A great effort taking a 13 second exposure in a wind chill of -21C (Pete Lawrence) British Astronomical Association HANDBOOK FOR 2017 NINETY–SIXTH YEAR OF PUBLICATION BURLINGTON HOUSE, PICCADILLY, LONDON, W1J 0DU Telephone 020 7734 4145 PREFACE Welcome to the 96th Handbook of the British Astronomical Association. -
Tidal Fragmentation As the Origin of 1I/2017 U1 ('Oumua- Mua)
Tidal fragmentation as the origin of 1I/2017 U1 (‘Oumua- mua) Yun Zhang1;2;3;4˚ & Douglas N.C. Lin5;2 1National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China. 2Institute for Advanced Studies, Tsinghua University, Beijing, China. 3Universite´ Coteˆ d’Azur, Observatoire de la Coteˆ d’Azur, CNRS, Laboratoire Lagrange, Nice, France. 4Department of Astronomy, University of Maryland, College Park, MD, USA. 5Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA, USA. *To whom correspondence should be addressed; Email: [email protected] The first discovered interstellar object (ISO), ‘Oumuamua (1I/2017 U1) shows a dry and rocky surface, an unusually elongated short-to-long axis ratio c{a À 1{6, a low velocity rela- tive to the local standard of rest („ 10 km s´1), non-gravitational accelerations, and tumbles on a few hours timescale1–9. The inferred number density („ 3:5 ˆ 1013 ´ 2 ˆ 1015 pc´3) for a population of asteroidal ISOs10, 11 outnumbers cometary ISOs12 by ¥ 103, in contrast to the much lower ratio (À 10´2) of rocky/icy Kuiper belt objects13. Although some scenarios can cause the ejection of asteroidal ISOs14, 15, a unified formation theory has yet to comprehen- sively link all ‘Oumuamua’s puzzling characteristics and to account for the population. Here we show by numerical simulations that ‘Oumuamua-like ISOs can be prolifically produced through extensive tidal fragmentation and ejected during close encounters of their volatile- rich parent bodies with their host stars. Material strength enhanced by the intensive heating during periastron passages enables the emergence of extremely elongated triaxial ISOs with shape c{a À 1{10, sizes a „ 100 m, and rocky surfaces. -
Isotopic Ratios in Outbursting Comet C/2015 ER61
Astronomy & Astrophysics manuscript no. draft_Dec_07 c ESO 2018 September 10, 2018 Isotopic ratios in outbursting comet C/2015 ER61 Bin Yang1; 2, Damien Hutsemékers3, Yoshiharu Shinnaka4, Cyrielle Opitom1, Jean Manfroid3, Emmanuël Jehin3, Karen J. Meech5, Olivier R. Hainaut1, Jacqueline V. Keane5, and Michaël Gillon3 (Affiliations can be found after the references) September 10, 2018 ABSTRACT Isotopic ratios in comets are critical to understanding the origin of cometary material and the physical and chemical conditions in the early solar nebula. Comet C/2015 ER61 (PANSTARRS) underwent an outburst with a total brightness increase of 2 magnitudes on the night of 2017 April 4. The sharp increase in brightness offered a rare opportunity to measure the isotopic ratios of the light elements in the coma of this comet. We obtained two high-resolution spectra of C/2015 ER61 with UVES/VLT on the nights of 2017 April 13 and 17. At the time of our observations, the comet was fading gradually following the outburst. We measured the nitrogen and carbon isotopic ratios from the CN violet (0,0) band and found that 12C/13C=100 ± 15, 14N/15N=130 ± 15. 14 15 14 15 In addition, we determined the N/ N ratio from four pairs of NH2 isotopolog lines and measured N/ N=140 ± 28. The measured isotopic ratios of C/2015 ER61 do not deviate significantly from those of other comets. Key words. comets: general - comets: individual (C/2015 ER61) - methods: observational 1. Introduction Understanding how planetary systems form from proto- planetary disks remains one of the great challenges in as- tronomy. -
Elements of Astronomy
^ ELEMENTS ASTRONOMY: DESIGNED AS A TEXT-BOOK uabemws, Btminwcus, anb families. BY Rev. JOHN DAVIS, A.M. FORMERLY PROFESSOR OF MATHEMATICS AND ASTRONOMY IN ALLEGHENY CITY COLLEGE, AND LATE PRINCIPAL OF THE ACADEMY OF SCIENCE, ALLEGHENY CITY, PA. PHILADELPHIA: PRINTED BY SHERMAN & CO.^ S. W. COB. OF SEVENTH AND CHERRY STREETS. 1868. Entered, according to Act of Congress, in the year 1867, by JOHN DAVIS, in the Clerk's OlBce of the District Court of the United States for the Western District of Pennsylvania. STEREOTYPED BY MACKELLAR, SMITHS & JORDAN, PHILADELPHIA. CAXTON PRESS OF SHERMAN & CO., PHILADELPHIA- PREFACE. This work is designed to fill a vacuum in academies, seminaries, and families. With the advancement of science there should be a corresponding advancement in the facilities for acquiring a knowledge of it. To economize time and expense in this department is of as much importance to the student as frugality and in- dustry are to the success of the manufacturer or the mechanic. Impressed with the importance of these facts, and having a desire to aid in the general diffusion of useful knowledge by giving them some practical form, this work has been prepared. Its language is level to the comprehension of the youthful mind, and by an easy and familiar method it illustrates and explains all of the principal topics that are contained in the science of astronomy. It treats first of the sun and those heavenly bodies with which we are by observation most familiar, and advances consecutively in the investigation of other worlds and systems which the telescope has revealed to our view. -
Culpeper Astronomy Club Meeting March 25, 2019 Overview
Copernicus & Trans-Neptunian Objects Culpeper Astronomy Club Meeting March 25, 2019 Overview • Introductions • Copernicus • Pluto and Trans-Neptunian Objects (TNO) • Constellations: Canis Major, Lepus, Monoceros • Observing Session (Weather permitting) Observing Sessions • CAC Group Session: 23 March, 7:30-11 p.m. • Had a great evening under incredible skies! • ISS Pass at 7:55 p.m. lasted 6 minutes • 4 inch refractor (SV110ED/G11) • Mars, small (4.79”) and reddish; Uranus, blue dot low in horizon • Open clusters: the Pleiades (M45) and the Beehive (M44) and M35, M36, M37, M38, M41, M46, M47, and M48 • Several double stars were checked out in Cassiopeia, Taurus, Leo and Cancer...including 57 Cancri, an exceptionally close double at 1.5 arcsec • 30 inch dobsonian • Nebula (M42 and Owl) • Galaxies (M81 and 82); Leo Geocentric Theory • The geocentric model (also known as Geocentrism, or the Ptolemaic system) is a superseded description of the Universe with Earth at the center • Under the geocentric model, the Sun, Moon, stars, and planets all orbited Earth • The geocentric model served as the predominant description of the cosmos in many ancient civilizations, such as those of Aristotle and Ptolemy • Two observations supported the idea that Earth was the center of the Universe: • First, from anywhere on Earth, the Sun appears to revolve around Earth once per day; while the Moon and the planets have their own motions, they also appear to revolve around Earth about once per day; the stars appeared to be fixed on a celestial sphere rotating