DOCSLIB.ORG

Occultation Meaning and Examples

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Occultation Meaning and Examples Occultation meaning and examples Continue Diccionario zgt; Ejemplos de occultization occultism aon no aesthe en el Cambridge Dictionary. Tudes Ayudar! A year later, he began with scientific observations of comets, meteors, solar photosphere, variable stars, planets and occults. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. Batteries were used in short periods of the occult when there was no solar energy. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. Where celestial bodies are so close together that one actually passes over the other, the event is known as the occult. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. When observed by itself during such occultism, the satellite appears deep blue or bluish-green. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. It is the occultization of these interests that is a historical unconscious law. From Cambridge English Corpus These characteristics: range of sensors, angles of morbidity and sign of the occult of another object. From the Cambridge English Corps Finally, a part of the planet was found by the transit parent star with secondary occultism also detected. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. The rings were studied by analysing the results of radio, ultraviolet and optical occultism. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. The exact time of lunar occults is regularly performed by (mostly amateur) astronomers. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. Transits, occults and eclipses in general are all effects of syzygy. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. Occult phenomena have allowed to determine the properties of scattering of the lunar limb. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. It was later determined to be an observational artifact, but the feasibility of measuring stellar diameters using lunar occults was well established. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. Some angular star diameters have been measured by the time of lunar occults, which is useful for determining the effective temperatures of these stars. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. From an observational and scientific point of view, these grazes are the most dynamic and interesting of the lunar occults. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. Social occultism social construction. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. It is believed that it is still present on Earth in the occult (i.e. hidden), and will reappear at the end of time. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. In the past, this star was catalogued as spectroscopic binary, and the satellite was apparently discovered by the lunar occult. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. An alternative method was to simultaneously observe the occult of stars in various observatories. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. It was the only event of the occultization of asteroids visible to the naked eye in the 21st century. De Wikipedia este ejemplo es de Wikipedia y puede reutilizarse bajo una gallia cc by-SA. Las opinions mostradas en los ejemplos do not represent las views de los editors cambridge University Press or de sus licenciantes. La palabra occultism is not an aesthe en el Cambridge Dictionary of Todawi. You're ayudar! Parte de la Oracion Elegier sustantivo, verbo, etc. adjetivo adverbio exclamaci'n sustantivo n'mero prefijo sufijo verbo Definici'n Cancelar Not to be confused with the occult. For the Shiite Islamic faith, see for the social phenomenon, see this July 1997 still frame, captured from the video, the bright star Aldebaran has just reappeared on the dark limb of a dying crescent in this pre- dawn occult. the occlusion of an object by another object that passes between it and the observer Occultization is an event that occurs when one object is hidden by another object that passes between it and the observer. This term is often used in astronomy, but can also refer to any situation in which an object in the foreground blocks the view (occultisms) of an object in the background. In this general sense, the occult refers to a visual scene observed from low-flying aircraft (or computer images), where foreground objects dynamically obscure distant objects as the scene changes over time. If a closer body does not completely hide further, the event is called transit. Both transit and the occult can usually be referred to as occlusion; and if the shadow is cast on the observer, it's called an eclipse. The occultisms of the Moon Play Media Occultization of the moon star Term occultism is most commonly used to describe those relatively frequent cases when the moon passes in front of a star during its orbital motion around the Earth. Since the moon, with an angular velocity relative to the stars 0.55 arcsec/s or 2.7 degrees, has a very thin atmosphere and the stars have an angular diameter of no more than 0.057 arc or 0.28 a star occulted by the Moon will disappear or appear in 0.1 seconds or less on the edge of the moon, or limb. Events taking place on the dark limb of the Moon are of particular interest to observers, as the absence of glare facilitates observation and timing. The Moon's orbit is slightly tilted towards the ecliptic (see the moon's orbit), which means that any star with an ecliptic latitude of less than ± 6.5 degrees can be occulted by it. Three stars of the first magnitude appear in this group - Regulus, Spika and Antares - which means that they can be occulted by the Moon or planets. Aldebaran's occultisms in this era are only possible by the moon, because the planets pass the Aldebaran in the north. Neither the planetary nor lunar occults of Pollox are currently possible, but in a few thousand years it will happen, as it was in the distant past. Some, in particular, close deep-sea objects, such as the Pleiades, can be occulted by the Moon. Minutes before the occult occult moon (a bright object in the upper right) was occulted by the moon on June 16, 2005, the observer can see the star periodically disappear and reappear as the moon's irregular limb passes by the star. , the creation of so- called grazing of the lunar occult. From an observational and scientific point of view, these passes are the most dynamic and interesting of the lunar occults. The exact timing of lunar occults is regularly carried out by (primarily amateur) astronomers. Lunar occultisms, a little bit of precision in a few tenths of a second, have different scientific applications, especially in improving our knowledge of lunar topography. Photovoltaic analysis of lunar occults also found that some stars are very close to visual or spectroscopic diatical file storage. Some angular star diameters have been measured by the time of lunar occults, which is useful for determining the effective temperatures of these stars. Early radio astronomy found that the occult of the moon's radio sources was valuable for determining their exact position, as the long wavelength of the radio waves limited the resolution available by direct observation. This was critical to the unambiguous identification of radio source 3C 273 with optical quasar and its jet, and the basic prerequisite for Martin Schmidt's discovery of the cosmological nature of quasars. Several times during the year the moon can be noticed by the occult of the planet. Since planets, unlike stars, have significant angular dimensions, the lunar occults of the planets will create a narrow zone on Earth from which the partial occult of the planet will take place. The observer, located in this narrow zone, could observe the disk of the planet, partially blocked by the slow-moving Moon. Same mechanism be seen with the Sun, where observers on Earth will view it as a solar eclipse. Thus, a total solar eclipse is essentially the moon of the occult Sun. The occult of planets grazing the occult of Ray Dion's occult, the two moons of Saturn, depicted Cassini-Guygens Home article: Planetary transits and occultation stars can also be occulted by planets. The occultisms of bright stars are rare. In 1959, Venus is the occult regulator, and the next occult of the bright star (also the Venus Regulator) will be in 2044. The rings of Uranus were first discovered when this planet had an occult star in 1977. On July 3, 1989, Saturn passed in front of a star of magnitude 5 of 28 Sagittarius. Pluto had occult stars in 1988, 2002 and 2006, allowing its weak atmosphere to be studied through atmospheric-sounding limbs. Mutual planetary occultisms In rare cases one planet may pass in front of another. If a closer planet seems larger than a farther one, the event is called a mutual planetary occult. Jupiter rarely has the occult of Saturn. This is one of the rarest known events, the next of which occurred on February 10, 7541.
Load more

Recommended publications
  • The Minor Planet Bulletin
    THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 36, NUMBER 3, A.D. 2009 JULY-SEPTEMBER 77. PHOTOMETRIC MEASUREMENTS OF 343 OSTARA Our data can be obtained from http://www.uwec.edu/physics/ AND OTHER ASTEROIDS AT HOBBS OBSERVATORY asteroid/. Lyle Ford, George Stecher, Kayla Lorenzen, and Cole Cook Acknowledgements Department of Physics and Astronomy University of Wisconsin-Eau Claire We thank the Theodore Dunham Fund for Astrophysics, the Eau Claire, WI 54702-4004 National Science Foundation (award number 0519006), the [email protected] University of Wisconsin-Eau Claire Office of Research and Sponsored Programs, and the University of Wisconsin-Eau Claire (Received: 2009 Feb 11) Blugold Fellow and McNair programs for financial support. References We observed 343 Ostara on 2008 October 4 and obtained R and V standard magnitudes. The period was Binzel, R.P. (1987). “A Photoelectric Survey of 130 Asteroids”, found to be significantly greater than the previously Icarus 72, 135-208. reported value of 6.42 hours. Measurements of 2660 Wasserman and (17010) 1999 CQ72 made on 2008 Stecher, G.J., Ford, L.A., and Elbert, J.D. (1999). “Equipping a March 25 are also reported. 0.6 Meter Alt-Azimuth Telescope for Photometry”, IAPPP Comm, 76, 68-74. We made R band and V band photometric measurements of 343 Warner, B.D. (2006). A Practical Guide to Lightcurve Photometry Ostara on 2008 October 4 using the 0.6 m “Air Force” Telescope and Analysis. Springer, New York, NY. located at Hobbs Observatory (MPC code 750) near Fall Creek, Wisconsin.
    [Show full text]
  • Asteroid Family Ages. 2015. Icarus 257, 275-289
    Icarus 257 (2015) 275–289 Contents lists available at ScienceDirect Icarus journal homepage: www.elsevier.com/locate/icarus Asteroid family ages ⇑ Federica Spoto a,c, , Andrea Milani a, Zoran Knezˇevic´ b a Dipartimento di Matematica, Università di Pisa, Largo Pontecorvo 5, 56127 Pisa, Italy b Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia c SpaceDyS srl, Via Mario Giuntini 63, 56023 Navacchio di Cascina, Italy article info abstract Article history: A new family classification, based on a catalog of proper elements with 384,000 numbered asteroids Received 6 December 2014 and on new methods is available. For the 45 dynamical families with >250 members identified in this Revised 27 April 2015 classification, we present an attempt to obtain statistically significant ages: we succeeded in computing Accepted 30 April 2015 ages for 37 collisional families. Available online 14 May 2015 We used a rigorous method, including a least squares fit of the two sides of a V-shape plot in the proper semimajor axis, inverse diameter plane to determine the corresponding slopes, an advanced error model Keywords: for the uncertainties of asteroid diameters, an iterative outlier rejection scheme and quality control. The Asteroids best available Yarkovsky measurement was used to estimate a calibration of the Yarkovsky effect for each Asteroids, dynamics Impact processes family. The results are presented separately for the families originated in fragmentation or cratering events, for the young, compact families and for the truncated, one-sided families. For all the computed ages the corresponding uncertainties are provided, and the results are discussed and compared with the literature. The ages of several families have been estimated for the first time, in other cases the accu- racy has been improved.
    [Show full text]
  • Occultation Newsletter Volume 8, Number 4
    Volume 12, Number 1 January 2005 $5.00 North Am./$6.25 Other International Occultation Timing Association, Inc. (IOTA) In this Issue Article Page The Largest Members Of Our Solar System – 2005 . 4 Resources Page What to Send to Whom . 3 Membership and Subscription Information . 3 IOTA Publications. 3 The Offices and Officers of IOTA . .11 IOTA European Section (IOTA/ES) . .11 IOTA on the World Wide Web. Back Cover ON THE COVER: Steve Preston posted a prediction for the occultation of a 10.8-magnitude star in Orion, about 3° from Betelgeuse, by the asteroid (238) Hypatia, which had an expected diameter of 148 km. The predicted path passed over the San Francisco Bay area, and that turned out to be quite accurate, with only a small shift towards the north, enough to leave Richard Nolthenius, observing visually from the coast northwest of Santa Cruz, to have a miss. But farther north, three other observers video recorded the occultation from their homes, and they were fortuitously located to define three well- spaced chords across the asteroid to accurately measure its shape and location relative to the star, as shown in the figure. The dashed lines show the axes of the fitted ellipse, produced by Dave Herald’s WinOccult program. This demonstrates the good results that can be obtained by a few dedicated observers with a relatively faint star; a bright star and/or many observers are not always necessary to obtain solid useful observations. – David Dunham Publication Date for this issue: July 2005 Please note: The date shown on the cover is for subscription purposes only and does not reflect the actual publication date.
    [Show full text]
  • (704) Interamnia from Its Occultations and Lightcurves
    International Journal of Astronomy and Astrophysics, 2014, 4, 91-118 Published Online March 2014 in SciRes. http://www.scirp.org/journal/ijaa http://dx.doi.org/10.4236/ijaa.2014.41010 A 3-D Shape Model of (704) Interamnia from Its Occultations and Lightcurves Isao Satō1*, Marc Buie2, Paul D. Maley3, Hiromi Hamanowa4, Akira Tsuchikawa5, David W. Dunham6 1Astronomical Society of Japan, Yamagata, Japan 2Southwest Research Institute, Boulder, USA 3International Occultation Timing Association, Houston, USA 4Hamanowa Astronomical Observatory, Fukushima, Japan 5Yanagida Astronomical Observatory, Ishikawa, Japan 6International Occultation Timing Association, Greenbelt, USA Email: *[email protected], [email protected], [email protected], [email protected], [email protected], [email protected] Received 9 November 2013; revised 9 December 2013; accepted 17 December 2013 Copyright © 2014 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract A 3-D shape model of the sixth largest of the main belt asteroids, (704) Interamnia, is presented. The model is reproduced from its two stellar occultation observations and six lightcurves between 1969 and 2011. The first stellar occultation was the occultation of TYC 234500183 on 1996 De- cember 17 observed from 13 sites in the USA. An elliptical cross section of (344.6 ± 9.6 km) × (306.2 ± 9.1 km), for position angle P = 73.4 ± 12.5˚ was fitted. The lightcurve around the occulta- tion shows that the peak-to-peak amplitude was 0.04 mag. and the occultation phase was just be- fore the minimum.
    [Show full text]
  • Clasificación Taxonómica De Asteroides
    Clasificación Taxonómica de Asteroides Cercanos a la Tierra por Ana Victoria Ojeda Vera Tesis sometida como requisito parcial para obtener el grado de MAESTRO EN CIENCIAS EN CIENCIA Y TECNOLOGÍA DEL ESPACIO en el Instituto Nacional de Astrofísica, Óptica y Electrónica Agosto 2019 Tonantzintla, Puebla Bajo la supervisión de: Dr. José Ramón Valdés Parra Investigador Titular INAOE Dr. José Silviano Guichard Romero Investigador Titular INAOE c INAOE 2019 El autor otorga al INAOE el permiso de reproducir y distribuir copias parcial o totalmente de esta tesis. II Dedicatoria A mi familia, con gran cariño. A mis sobrinos Ian y Nahil, y a mi pequeña Lia. III Agradecimientos Gracias a mi familia por su apoyo incondicional. A mi mamá Tere, por enseñarme a ser perseverante y dedicada, y por sus miles de muestras de afecto. A mi hermana Fernanda, por darme el tiempo, consejos y cariño que necesitaba. A mi pareja Odi, por su amor y cariño estos tres años, por su apoyo, paciencia y muchas horas de ayuda en la maestría, pero sobre todo por darme el mejor regalo del mundo, nuestra pequeña Lia. Gracias a mis asesores Dr. José R. Valdés y Dr. José S. Guichard, promotores de esta tesis, por su paciencia, consejos y supervisión, y por enseñarme con sus clases divertidas y motivadoras todo lo que se refiere a este trabajo. A los miembros del comité, Dra. Raquel Díaz, Dr. Raúl Mújica y Dr. Sergio Camacho, por tomarse el tiempo de revisar y evaluar mi trabajo. Estoy muy agradecida con todos por sus críticas constructivas y sugerencias.
    [Show full text]
  • ~XECKDING PAGE BLANK WT FIL,,Q
    1,. ,-- ,-- ~XECKDING PAGE BLANK WT FIL,,q DYNAMICAL EVIDENCE REGARDING THE RELATIONSHIP BETWEEN ASTEROIDS AND METEORITES GEORGE W. WETHERILL Department of Temcltricrl kgnetism ~amregie~mtittition of Washington Washington, D. C. 20025 Meteorites are fragments of small solar system bodies (comets, asteroids and Apollo objects). Therefore they may be expected to provide valuable information regarding these bodies. How- ever, the identification of particular classes of meteorites with particular small bodies or classes of small bodies is at present uncertain. It is very unlikely that any significant quantity of meteoritic material is obtained from typical ac- tive comets. Relatively we1 1-studied dynamical mechanisms exist for transferring material into the vicinity of the Earth from the inner edge of the asteroid belt on an 210~-~year time scale. It seems likely that most iron meteorites are obtained in this way, and a significant yield of complementary differec- tiated meteoritic silicate material may be expected to accom- pany these differentiated iron meteorites. Insofar as data exist, photometric measurements support an association between Apollo objects and chondri tic meteorites. Because Apol lo ob- jects are in orbits which come close to the Earth, and also must be fragmented as they traverse the asteroid belt near aphel ion, there also must be a component of the meteorite flux derived from Apollo objects. Dynamical arguments favor the hypothesis that most Apollo objects are devolatilized comet resiaues. However, plausible dynamical , petrographic, and cosmogonical reasons are known which argue against the simple conclusion of this syllogism, uiz., that chondri tes are of cometary origin. Suggestions are given for future theoretical , observational, experimental investigations directed toward improving our understanding of this puzzling situation.
    [Show full text]
  • New Double Stars from Asteroidal Occultations, 1971 - 2008
    Vol. 6 No. 1 January 1, 2010 Journal of Double Star Observations Page 88 New Double Stars from Asteroidal Occultations, 1971 - 2008 Dave Herald, Canberra, Australia International Occultation Timing Association (IOTA) Robert Boyle, Carlisle, Pennsylvania, USA Dickinson College David Dunham, Greenbelt, Maryland, USA; Toshio Hirose, Tokyo, Japan; Paul Maley, Houston, Texas, USA; Bradley Timerson, Newark, New York, USA International Occultation Timing Association (IOTA) Tim Farris, Gallatin, Tennessee, USA Volunteer State Community College Eric Frappa and Jean Lecacheux, Paris, France Observatoire de Paris Tsutomu Hayamizu, Kagoshima, Japan Sendai Space Hall Marek Kozubal, Brookline, Massachusetts, USA Clay Center Richard Nolthenius, Aptos, California, USA Cabrillo College and IOTA Lewis C. Roberts, Jr., Pasadena, California, USA California Institute of Technology/Jet Propulsion Laboratory David Tholen, Honolulu, Hawaii, USA University of Hawaii E-mail: [email protected] Abstract: Observations of occultations by asteroids and planetary moons can detect double stars with separations in the range of about 0.3” to 0.001”. This paper lists all double stars detected in asteroidal occultations up to the end of 2008. It also provides a general explanation of the observational method and analysis. The incidence of double stars with a separation in the range 0.001” to 0.1” with a magnitude difference less than 2 is estimated to be about 1%. Vol. 6 No. 1 January 1, 2010 Journal of Double Star Observations Page 89 New Double Stars from Asteroidal Occultations, 1971 - 2008 tions. More detail about the method of analysis is set Introduction out in the Appendix. Asteroids and planetary moons will naturally oc- cult many stars as they move through the sky.
    [Show full text]
  • DOUBLE DOME1 I Issued by The
    DOUBLE DOME1 i Issued by the MILWAUKEE ASTRONOMICAL SOCIETY - : MAY 1983 t - ÌY ELECTION MEETING: The May meeting will be in two parts. Some time will be taken up by an election of' board members and officers, and some time will be given to Dr. Paul Rybski o± University of Chicago's Yerkes Observatory. Dr. Rybski's talk is entitled "Charge Couple Devices - Their Uses in Contemporary Astronomy. ft Four officers and four board members will be elected. Candidates may be incumbents, nominees volunteers, or recommended members who have agreed to run. Directors serve three-year terms with a two-term limit. Officers serve for one year with unlimited re-election. Let's have a big turnout. Bring a friend and enjoy a good, informative speaker, arid do your duty to the MAS by electing qualified people to help shape the future of the Society. WHEN: Friday, May 20, 8 p.m. WHERE: UWM Physics Bldg., corner of Kenwood and Cramer, room 133. OPEN HOUSES are scheduled for June 17, July 1, 15, 29, August 12, 26, and September 9, all Friday nights. As in the past, each night will feature a different astronomical sub- ject pertaining to the heavens. The June 17 talk will cover eclipses. Since the New Berlin facilities will be open to the general public-- we can also expect the news media to be present--volunteers will be needed to assist the anticipated large crowds by operating 'scopes, guiding, minding the parking lots, or spelling other workers. Perhaps you'd like to give a talk apropos to the topic for that particular night.
    [Show full text]
  • An Ancient and a Primordial Collisional Family As the Main Sources of X-Type Asteroids of the Inner Main Belt
    Astronomy & Astrophysics manuscript no. agapi2019.01.22_R1 c ESO 2019 February 6, 2019 An ancient and a primordial collisional family as the main sources of X-type asteroids of the inner Main Belt ∗ Marco Delbo’1, Chrysa Avdellidou1; 2, and Alessandro Morbidelli1 1 Université Côte d’Azur, CNRS–Lagrange, Observatoire de la Côte d’Azur, CS 34229 – F 06304 NICE Cedex 4, France e-mail: [email protected] e-mail: [email protected] 2 Science Support Office, Directorate of Science, European Space Agency, Keplerlaan 1, NL-2201 AZ Noordwijk ZH, The Netherlands. Received February 6, 2019; accepted February 6, 2019 ABSTRACT Aims. The near-Earth asteroid population suggests the existence of an inner Main Belt source of asteroids that belongs to the spec- troscopic X-complex and has moderate albedos. The identification of such a source has been lacking so far. We argue that the most probable source is one or more collisional asteroid families that escaped discovery up to now. Methods. We apply a novel method to search for asteroid families in the inner Main Belt population of asteroids belonging to the X- complex with moderate albedo. Instead of searching for asteroid clusters in orbital elements space, which could be severely dispersed when older than some billions of years, our method looks for correlations between the orbital semimajor axis and the inverse size of asteroids. This correlation is the signature of members of collisional families, which drifted from a common centre under the effect of the Yarkovsky thermal effect. Results. We identify two previously unknown families in the inner Main Belt among the moderate-albedo X-complex asteroids.
    [Show full text]
  • Aqueous Alteration on Main Belt Primitive Asteroids: Results from Visible Spectroscopy1
    Aqueous alteration on main belt primitive asteroids: results from visible spectroscopy1 S. Fornasier1,2, C. Lantz1,2, M.A. Barucci1, M. Lazzarin3 1 LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, France 2 Univ. Paris Diderot, Sorbonne Paris Cit´e, 4 rue Elsa Morante, 75205 Paris Cedex 13 3 Department of Physics and Astronomy of the University of Padova, Via Marzolo 8 35131 Padova, Italy Submitted to Icarus: November 2013, accepted on 28 January 2014 e-mail: [email protected]; fax: +33145077144; phone: +33145077746 Manuscript pages: 38; Figures: 13 ; Tables: 5 Running head: Aqueous alteration on primitive asteroids Send correspondence to: Sonia Fornasier LESIA-Observatoire de Paris arXiv:1402.0175v1 [astro-ph.EP] 2 Feb 2014 Batiment 17 5, Place Jules Janssen 92195 Meudon Cedex France e-mail: [email protected] 1Based on observations carried out at the European Southern Observatory (ESO), La Silla, Chile, ESO proposals 062.S-0173 and 064.S-0205 (PI M. Lazzarin) Preprint submitted to Elsevier September 27, 2018 fax: +33145077144 phone: +33145077746 2 Aqueous alteration on main belt primitive asteroids: results from visible spectroscopy1 S. Fornasier1,2, C. Lantz1,2, M.A. Barucci1, M. Lazzarin3 Abstract This work focuses on the study of the aqueous alteration process which acted in the main belt and produced hydrated minerals on the altered asteroids. Hydrated minerals have been found mainly on Mars surface, on main belt primitive asteroids and possibly also on few TNOs. These materials have been produced by hydration of pristine anhydrous silicates during the aqueous alteration process, that, to be active, needed the presence of liquid water under low temperature conditions (below 320 K) to chemically alter the minerals.
    [Show full text]
  • Herschel Celestial Calibration Sources: Four Large Main-Belt Asteroids As
    Experimental Astronomy manuscript No. (will be inserted by the editor) Herschel celestial calibration sources Four large main-belt asteroids as prime flux calibrators for the far-IR/sub-mm range Thomas M¨uller Zoltan´ Balog Markus Nielbock Tanya· Lim David Teyssier· Michael Olberg· Ulrich· Klaas Hendrik· Linz Bruno Altieri· Chris Pearson· George Bendo· Esa Vilenius · · · Received: date / Accepted: date Abstract Celestial standards play a major role in observational astrophysics. They are needed to characterise the performance of instruments and are paramount for photometric calibration. During the Herschel Calibration Asteroid Preparatory Pro- gramme approximately 50 asteroids have been established as far-IR/sub-mm/mm calibrators for Herschel. The selected asteroids fill the flux gap between the sub- mm/mm calibrators Mars, Uranus and Neptune, and the mid-IR bright calibration stars. All three Herschel instruments observed asteroids for various calibration pur- poses, including pointing tests, absolute flux calibration, relative spectral response function, observing mode validation, and cross-calibration aspects. Here we present newly established models for the four large and well characterized main-belt aster- oids (1) Ceres, (2) Pallas, (4) Vesta, and (21) Lutetia which can be considered as new prime flux calibrators. The relevant object-specific properties (size, shape, spin- properties, albedo, thermal properties) are well established. The seasonal (distance to T. M¨uller, E. Vilenius Max Planck Institute for Extraterrestrial Physics, PO Box 1312, Giessenbachstrasse, 85741 Garching, Germany Tel.: +49 89 30000-3499 E-mail: [email protected] Z. Balog, M. Nielbock, U. Klaas, H. Linz Max Planck Institute for Astronomy, K¨onigstuhl 17, 69117 Heidelberg, Germany T.
    [Show full text]
  • Spectroscopic Survey of X-Type Asteroids S
    Spectroscopic Survey of X-type Asteroids S. Fornasier, B.E. Clark, E. Dotto To cite this version: S. Fornasier, B.E. Clark, E. Dotto. Spectroscopic Survey of X-type Asteroids. Icarus, Elsevier, 2011, 10.1016/j.icarus.2011.04.022. hal-00768793 HAL Id: hal-00768793 https://hal.archives-ouvertes.fr/hal-00768793 Submitted on 24 Dec 2012 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Accepted Manuscript Spectroscopic Survey of X-type Asteroids S. Fornasier, B.E. Clark, E. Dotto PII: S0019-1035(11)00157-6 DOI: 10.1016/j.icarus.2011.04.022 Reference: YICAR 9799 To appear in: Icarus Received Date: 26 December 2010 Revised Date: 22 April 2011 Accepted Date: 26 April 2011 Please cite this article as: Fornasier, S., Clark, B.E., Dotto, E., Spectroscopic Survey of X-type Asteroids, Icarus (2011), doi: 10.1016/j.icarus.2011.04.022 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form.
    [Show full text]