The New Planet Pholus
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Surface Characteristics of Transneptunian Objects and Centaurs from Photometry and Spectroscopy
Barucci et al.: Surface Characteristics of TNOs and Centaurs 647 Surface Characteristics of Transneptunian Objects and Centaurs from Photometry and Spectroscopy M. A. Barucci and A. Doressoundiram Observatoire de Paris D. P. Cruikshank NASA Ames Research Center The external region of the solar system contains a vast population of small icy bodies, be- lieved to be remnants from the accretion of the planets. The transneptunian objects (TNOs) and Centaurs (located between Jupiter and Neptune) are probably made of the most primitive and thermally unprocessed materials of the known solar system. Although the study of these objects has rapidly evolved in the past few years, especially from dynamical and theoretical points of view, studies of the physical and chemical properties of the TNO population are still limited by the faintness of these objects. The basic properties of these objects, including infor- mation on their dimensions and rotation periods, are presented, with emphasis on their diver- sity and the possible characteristics of their surfaces. 1. INTRODUCTION cally with even the largest telescopes. The physical char- acteristics of Centaurs and TNOs are still in a rather early Transneptunian objects (TNOs), also known as Kuiper stage of investigation. Advances in instrumentation on tele- belt objects (KBOs) and Edgeworth-Kuiper belt objects scopes of 6- to 10-m aperture have enabled spectroscopic (EKBOs), are presumed to be remnants of the solar nebula studies of an increasing number of these objects, and signifi- that have survived over the age of the solar system. The cant progress is slowly being made. connection of the short-period comets (P < 200 yr) of low We describe here photometric and spectroscopic studies orbital inclination and the transneptunian population of pri- of TNOs and the emerging results. -
Water Ice in 2060 Chiron and Its Implications for Centaurs and Kuiper Belt Objects
Water Ice in 2060 Chiron and its Implications for Centaurs and Kuiper Belt Objects Jane X. Luu Sterrewacht Leiden Postbus 9513, 2300RA Leiden, The Netherlands David C. Jewitt1 Institute for Astronomy 2680 Woodlawn Drive, Honolulu, HI 96822 and Chad Trujillo1 Institute for Astronomy 2680 Woodlawn Drive, Honolulu, HI 96822 Received ; accepted Submitted to Ap. J. Letters, accepted 31 Jan 2000 1Visiting Astronomer, W. M. Keck Observatory, jointly operated by California Institute of Technology and the University of California. –2– ABSTRACT We report the detection of water ice in the Centaur 2060 Chiron, based on near-infrared spectra (1.0 - 2.5 µm) taken with the 3.8-meter United Kingdom Infrared Telescope (UKIRT) and the 10-meter Keck Telescope. The appearance of this ice is correlated with the recent decline in Chiron’s cometary activity: the decrease in the coma cross-section allows previously hidden solid-state surface features to be seen. We predict that water ice is ubiquitous among Centaurs and Kuiper Belt objects, but its surface coverage varies from object to object, and thus determines its detectability and the occurrence of cometary activity. Subject headings: comets – Kuiper Belt – solar system: formation 1. Introduction The Centaurs are a set of solar system objects whose orbits are confined between those of Jupiter and Neptune. Their planet-crossing orbits imply a short dynamical lifetime (106 107 yr). The current belief is that Centaurs are objects scattered from the Kuiper − Belt that may eventually end up in the inner solar system as short-period comets. The first discovered and brightest known Centaur, 2060 Chiron, is relatively well studied. -
Greek Mythology
Greek Mythology The Creation Myth “First Chaos came into being, next wide bosomed Gaea(Earth), Tartarus and Eros (Love). From Chaos came forth Erebus and black Night. Of Night were born Aether and Day (whom she brought forth after intercourse with Erebus), and Doom, Fate, Death, sleep, Dreams; also, though she lay with none, the Hesperides and Blame and Woe and the Fates, and Nemesis to afflict mortal men, and Deceit, Friendship, Age and Strife, which also had gloomy offspring.”[11] “And Earth first bore starry Heaven (Uranus), equal to herself to cover her on every side and to be an ever-sure abiding place for the blessed gods. And earth brought forth, without intercourse of love, the Hills, haunts of the Nymphs and the fruitless sea with his raging swell.”[11] Heaven “gazing down fondly at her (Earth) from the mountains he showered fertile rain upon her secret clefts, and she bore grass flowers, and trees, with the beasts and birds proper to each. This same rain made the rivers flow and filled the hollow places with the water, so that lakes and seas came into being.”[12] The Titans and the Giants “Her (Earth) first children (with heaven) of Semi-human form were the hundred-handed giants Briareus, Gyges, and Cottus. Next appeared the three wild, one-eyed Cyclopes, builders of gigantic walls and master-smiths…..Their names were Brontes, Steropes, and Arges.”[12] Next came the “Titans: Oceanus, Hypenon, Iapetus, Themis, Memory (Mnemosyne), Phoebe also Tethys, and Cronus the wily—youngest and most terrible of her children.”[11] “Cronus hated his lusty sire Heaven (Uranus). -
University of Hawai'i Library
UNIVERSITY OF HAWAI'I LIBRARY A Physical Survey of Centaurs A DISSERTATION SUBMITTED TO THE GRADUATE DIVISION OF THE UNIVERSITY OF HAWAI'I IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN ASTRONOMY MAY 2003 By James M. Bauer Dissertation Committee: Karen J. Meech, Chairperson Tom Dinell Alan Stockton David J. Tholen Alan Tokunaga © Copyright 2003 by James M. Bauer All Rights Reserved iii To my wife, Chija "Oh, night that was my guide, Oh, night more lovely than the rising Sun... " IV Acknowledgements I wish to thank my dissertation committee, especially the chair, my graduate adviser and exceptionally generous and tolerant mentor, Karen J. Meech, but also Alan 'Ibkunaga, Dave Tholen, Alan Stockton and Tom Dinel!. Much needed advice and direction was contributed by all the members ofmy committee, and I will ever feel an abundance of respect, friendship, and gratitude toward each member. Yan Fernandez generously provided much additional guidance which was indispensable, to say the least. Likewise, Tobias Owen very graciously contributed many hours and imparted much wisdom to this work. I'd like to thank Ted Roush, for his instruction on the use and administration of his Hapke scattering code, and his advice in the interpretation of spectra, and above all his patience with a slow, but determined student. Though not officially committee members, Drs. Fernandez, Roush, and Owen were as integral a part of the writing of this dissertation as the committee members. John Kormendy and Mike Delisio, who were originally part of the committee, but later left for positions out of state also deserve and have my gratitude. -
Colours of Minor Bodies in the Outer Solar System II - a Statistical Analysis, Revisited
Astronomy & Astrophysics manuscript no. MBOSS2 c ESO 2012 April 26, 2012 Colours of Minor Bodies in the Outer Solar System II - A Statistical Analysis, Revisited O. R. Hainaut1, H. Boehnhardt2, and S. Protopapa3 1 European Southern Observatory (ESO), Karl Schwarzschild Straße, 85 748 Garching bei M¨unchen, Germany e-mail: [email protected] 2 Max-Planck-Institut f¨ur Sonnensystemforschung, Max-Planck Straße 2, 37 191 Katlenburg- Lindau, Germany 3 Department of Astronomy, University of Maryland, College Park, MD 20 742-2421, USA Received —; accepted — ABSTRACT We present an update of the visible and near-infrared colour database of Minor Bodies in the outer Solar System (MBOSSes), now including over 2000 measurement epochs of 555 objects, extracted from 100 articles. The list is fairly complete as of December 2011. The database is now large enough that dataset with a high dispersion can be safely identified and rejected from the analysis. The method used is safe for individual outliers. Most of the rejected papers were from the early days of MBOSS photometry. The individual measurements were combined so not to include possible rotational artefacts. The spectral gradient over the visible range is derived from the colours, as well as the R absolute magnitude M(1, 1). The average colours, absolute magnitude, spectral gradient are listed for each object, as well as their physico-dynamical classes using a classification adapted from Gladman et al., 2008. Colour-colour diagrams, histograms and various other plots are presented to illustrate and in- vestigate class characteristics and trends with other parameters, whose significance are evaluated using standard statistical tests. -
Polarimetric Properties of Transneptunian Objects and Centaurs
Polarimetry of Centaurs (2060) Chiron, (5145) Pholus and (10199) Chariklo I. N. Belskaya1,2, S. Bagnulo3, M.A. Barucci2, K. Muinonen4,5, G.P. Tozzi6, S. Fornasier2,7, L. Kolokolova8 1Institute of Astronomy, Kharkiv National University, 35 Sumska str., 61022 Kharkiv, Ukraine, [email protected] 2LESIA, Observatoire de Paris, 5, pl.Jules Janssen, 92195 Meudon cedex, France 3Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland, United Kingdom 4 Department of Physics, University of Helsinki, P.O. Box 64, Gustaf Hällströmin katu 2a, FI-00014, Finland 5Finnish Geodetic Institute, P.O. Box 15, Geodeetinrinne 2, FI-02431 Masala, Finland 6INAF - Oss. Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy 7University of Denis Diderot -Paris VII, France 8University of Maryland, College Park, MD, USA Published in Icarus 210, p.472-479, 2010 http://www.sciencedirect.com/science/article/pii/S0019103510002277 * Based on observations made with ESO Very Large Telescope at the La Silla-Paranal Observatory under programme ID 178.C-0036 (PI: A. Barucci) Pages: 18 Tables: 3 Figures: 8 Abstract Results of the first polarimetric observations of Centaurs (5145) Pholus and (10199) Chariklo, and new observations of (2060) Chiron are presented together with the estimates of their absolute magnitudes. Observations were carried out at the 8 m ESO Very Large Telescope in 2007-2008. They revealed noticeable negative polarization in the phase angle range 0.5-4.4 deg with a minimum varying from -1% to -2.1% in the R band. All three objects show diverse polarization phase angle behaviour, each distinctly different from that of transneptunian objects. -
Jjmonl 1407-8.Pmd
alactic Observer GJohn J. McCarthy Observatory Volume 7, No. 7/8 July/August 2014 Sorry! . Out of Gas The boomerang nebula, about 5000 light years away in the constellation Centaurus, is the last breath of a red giant star which has spent its energy and belched its outer layers into the cosmos. As these gases and stellar dust dissipate, they cool, leaving behind a frigid region (minus 272C - one degree warmer than absolute zero) and the coldest-known spot in the universe. Why "boomerang"? - find out at http://www.spacetelescope.org/images/heic0301a/. Source: European Space Agency, NASA 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 Jim Johnstone Steve Barone Carly KleinStern Colin Campbell Bob Lambert Dennis Cartolano Roger Moore Route Mike Chiarella Parker Moreland, PhD Jeff Chodak Allan Ostergren Bill Cloutier Marc Polansky Cecilia Detrich Joe Privitera Dirk Feather Monty Robson Randy Fender Don Ross Randy Finden Gene Schilling John Gebauer Katie Shusdock Elaine Green Jon Wallace Tina Hartzell Paul Woodell Tom Heydenburg Amy Ziffer In This Issue "OUT THE WINDOW ON YOUR LEFT" ............................... 4 COVER PHOTO AND OTHER CREDITS ................................ 16 MONS HADLEY AND THE APENNINES .................................. 5 SECOND SATURDAY STARS ............................................. -
A Coupling of the Origin of Asteroid Belt (Planetary Ring) and Comet
A coupling of the origin of asteroid belt (planetary ring) and comet Yongfeng Yang Bureau of Water Resources of Shandong Province, Jinan, Shandong Province, China, Mailing address: Shandong Water Resources Department, No. 127 Lishan Road, Jinan, Shandong Province, China, 250014 Tel. and fax: +86-531-8697-4362 E-mail: [email protected] Abstract It is a popular feature in the solar system that there are an asteroid belt and four planetary ring systems, various scenarios have been presented to account for their origins, but none of them is competent. Asteroid belt that is located between planetary orbits (Mars and Jupiter) is thin, circular, and parallel to the ecliptic, in contrast, planetary rings that are located between satellite’s orbits are also thin, circular, and approximately parallel to their father planetary equatorial plane. This similarity in distribution and shape implies that asteroid belt and planetary ring is likely to derive from the same physical process. Here we show, the two bodies of a binary planetary system (satellite system) due to their orbital shrinkages occur a catastrophic collision, which shatters them into fragments to all around. But due to the effect of hierarchical two-body gravitation that is responsible for the association of celestial objects in space, the barycenter of the initial binary planetary system (satellite system ) is survived in the collision and continues to orbit, which drags the barycenters of a series of subordinate hierarchical two-body associations of fragments to move. This successive hierarchical drag trends to constrain these separated fragments to form a circular belt (ring), and subsequently dynamical evolution confines the belt (ring) to become thin. -
Transneptunian Object Taxonomy 181
Fulchignoni et al.: Transneptunian Object Taxonomy 181 Transneptunian Object Taxonomy Marcello Fulchignoni LESIA, Observatoire de Paris Irina Belskaya Kharkiv National University Maria Antonietta Barucci LESIA, Observatoire de Paris Maria Cristina De Sanctis IASF-INAF, Rome Alain Doressoundiram LESIA, Observatoire de Paris A taxonomic scheme based on multivariate statistics is proposed to distinguish groups of TNOs having the same behavior concerning their BVRIJ colors. As in the case of asteroids, the broadband spectrophotometry provides a first hint about the bulk compositional properties of the TNOs’ surfaces. Principal components (PC) analysis shows that most of the TNOs’ color variability can be accounted for by a single component (i.e., a linear combination of the col- ors): All the studied objects are distributed along a quasicontinuous trend spanning from “gray” (neutral color with respect to those of the Sun) to very “red” (showing a spectacular increase in the reflectance of the I and J bands). A finer structure is superimposed to this trend and four homogeneous “compositional” classes emerge clearly, and independently from the PC analy- sis, if the TNO sample is analyzed with a grouping technique (the G-mode statistics). The first class (designed as BB) contains the objects that are neutral in color with respect to the Sun, while the RR class contains the very red ones. Two intermediate classes are separated by the G mode: the BR and the IR, which are clearly distinguished by the reflectance relative increases in the R and I bands. Some characteristics of the classes are deduced that extend to all the objects of a given class the properties that are common to those members of the class for which more detailed data are available (observed activity, full spectra, albedo). -
Astronomy & Astrophysics Colors of Minor Bodies in the Outer Solar
A&A 389, 641–664 (2002) Astronomy DOI: 10.1051/0004-6361:20020431 & c ESO 2002 Astrophysics Colors of Minor Bodies in the Outer Solar System⋆,⋆⋆ A statistical analysis O. R. Hainaut1 and A. C. Delsanti1,2 1 European Southern Observatory, Casilla 19001, Santiago, Chile 2 Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon Cedex, France Received 12 October 2001 / Accepted 14 February 2002 Abstract. We present a compilation of all available colors for 104 Minor Bodies in the Outer Solar System (MBOSSes); for each object, the original references are listed. The measurements were combined in a way that does not introduce rotational color artifacts. We then derive the slope, or reddening gradient, of the low resolution reflectance spectra obtained from the broad-band color for each object. A set of color-color diagrams, histograms and cumulative probability functions are presented as a reference for further studies, and are discussed. In the color-color diagrams, most of the objects are located very close to the “reddening line” (corresponding to linear reflectivity spectra). A small but systematic deviation is observed toward the I band indicating a flattening of the reflectivity at longer wavelengths, as expected from laboratory spectra. A deviation from linear spectra is noticed toward the B for the bluer objects; this is not matched by laboratory spectra of fresh ices, possibly suggesting that these objects could be covered with extremely evolved/irradiated ices. Five objects (1995 SM55, 1996 TL66, 1999 OY3, 1996 TO66 and (2060) Chiron) have almost perfectly solar colors; as two of these are known or suspected to harbour cometary activity, the others should be searched for activity or fresh ice signatures. -
Constellation Legends
Constellation Legends by Norm McCarter Naturalist and Astronomy Intern SCICON Andromeda – The Chained Lady Cassiopeia, Andromeda’s mother, boasted that she was the most beautiful woman in the world, even more beautiful than the gods. Poseidon, the brother of Zeus and the god of the seas, took great offense at this statement, for he had created the most beautiful beings ever in the form of his sea nymphs. In his anger, he created a great sea monster, Cetus (pictured as a whale) to ravage the seas and sea coast. Since Cassiopeia would not recant her claim of beauty, it was decreed that she must sacrifice her only daughter, the beautiful Andromeda, to this sea monster. So Andromeda was chained to a large rock projecting out into the sea and was left there to await the arrival of the great sea monster Cetus. As Cetus approached Andromeda, Perseus arrived (some say on the winged sandals given to him by Hermes). He had just killed the gorgon Medusa and was carrying her severed head in a special bag. When Perseus saw the beautiful maiden in distress, like a true champion he went to her aid. Facing the terrible sea monster, he drew the head of Medusa from the bag and held it so that the sea monster would see it. Immediately, the sea monster turned to stone. Perseus then freed the beautiful Andromeda and, claiming her as his bride, took her home with him as his queen to rule. Aquarius – The Water Bearer The name most often associated with the constellation Aquarius is that of Ganymede, son of Tros, King of Troy. -
The Reddest Transneptunian Objects
EPSC Abstracts Vol. 7 EPSC2012-155 2012 European Planetary Science Congress 2012 EEuropeaPn PlanetarSy Science CCongress c Author(s) 2012 The reddest transneptunian objects M.A. Barucci (1), F. Merlin (1), D. Perna (1), S. Fornasier (1) and C. de Bergh (1) (1) LESIA-Observatoire de Paris, CNRS, Univ. Pierre et Marie Curie, Univ. Paris Denis Diderot, 92195 Meudon Principal Cedex, France ([email protected] /Fax +33. 145077144) Abstract together with the fact that all colors are also randomly distributed, strongly argue in favor of the We analysed the reddest objects of the important mixing that occurred during the solar transneptunian and centaur populations, following system formation [3, 4]. the taxonomical class RR. The RR class of objects among the studied objects contains more than ¼ of the whole populations, including Centaurs, detached, classical, plutinos and scattered objects, and contains objects with all classes of ice content with a slight majority of sure ice content. 1. Introduction The last 20 years of studies of transneptunian objects changed completely our view on the formation and evolution of the Solar System. Fig 1: The lower left panel shows the distribution of Nevertheless their physical properties remain still the four TNO taxonomic groups (whose average unexplained. Barucci et al. [1] characterized the photometric colors are represented in the upper left panel physical properties and the surface composition of as reflectance values normalized to the Sun in the V-band) within each dynamical class. The right panel shows the these objects, obtaining high quality data for about 40 distribution of the taxonomical groups, with respect to the objects using the most powerful telescopes and orbital inclination relative to the ecliptic plane, for the instruments at VLT-ESO.