Mars • Venus IC – Jun 3 (58 Arc-Sec) • Venus GWE – Aug 12 (24.5 Arc-Sec) Jupiter
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Glossary Glossary
Glossary Glossary Albedo A measure of an object’s reflectivity. A pure white reflecting surface has an albedo of 1.0 (100%). A pitch-black, nonreflecting surface has an albedo of 0.0. The Moon is a fairly dark object with a combined albedo of 0.07 (reflecting 7% of the sunlight that falls upon it). The albedo range of the lunar maria is between 0.05 and 0.08. The brighter highlands have an albedo range from 0.09 to 0.15. Anorthosite Rocks rich in the mineral feldspar, making up much of the Moon’s bright highland regions. Aperture The diameter of a telescope’s objective lens or primary mirror. Apogee The point in the Moon’s orbit where it is furthest from the Earth. At apogee, the Moon can reach a maximum distance of 406,700 km from the Earth. Apollo The manned lunar program of the United States. Between July 1969 and December 1972, six Apollo missions landed on the Moon, allowing a total of 12 astronauts to explore its surface. Asteroid A minor planet. A large solid body of rock in orbit around the Sun. Banded crater A crater that displays dusky linear tracts on its inner walls and/or floor. 250 Basalt A dark, fine-grained volcanic rock, low in silicon, with a low viscosity. Basaltic material fills many of the Moon’s major basins, especially on the near side. Glossary Basin A very large circular impact structure (usually comprising multiple concentric rings) that usually displays some degree of flooding with lava. The largest and most conspicuous lava- flooded basins on the Moon are found on the near side, and most are filled to their outer edges with mare basalts. -
Polar Winds from VIIRS
Polar Winds from VIIRS Jeff Key*, Richard Dworak+, Dave Santek+, Wayne Bresky@, Steve Wanzong+ ! Jaime Daniels#, Andrew Bailey@, Chris Velden+, Hongming Qi^, Pete Keehn#, Walter Wolf#! ! *NOAA/National Environmental Satellite, Data, and Information Service, Madison, WI! + Cooperative Institute for Meteorological Satellite Studies, University of Wisconsin-Madison! #NOAA/National Environmental Satellite, Data, and Information Service, Camp Springs, MD! ^NOAA/National Environmental Satellite, Data, and Information Service, Camp Springs, MD! @I.M. Systems Group (IMSG), Rockville, MD USA! 11th International Winds Workshop, Auckland, 20-24 February 2012 The Polar Wind Product Suite MODIS Polar Winds LEO-GEO Polar Winds •" Aqua and Terra separately, bent pipe •" Combination of may geostationary data source Operational and polar-orbiting imagers •" Aqua and Terra combined, bent pipe •" Fills the 60-70 degree latitude gap •" Direct broadcast (DB) at EW –" McMurdo, Antarctica (Terra, Aqua) VIIRS Polar Winds –" Tromsø, Norway (Terra only) •" (Details on following slides) –" Sodankylä, Finland (Terra only) –" Fairbanks, Alaska (Terra, from UAF) EW AVHRR Polar Winds •" Global Area Coverage (GAC) for NOAA-15, -16, -17, -18, -19 Operational •" Metop Operational •" HRPT (High Resolution Picture Transmission = direct readout) at –" Barrow, Alaska, NOAA-16, -17, -18, -19 –" Rothera, Antarctica, NOAA-17, -18, -19 •" Historical GAC winds, 1982-2009. Two satellites throughout most of the time series. Polar Wind Product History Operational NWP Users of Polar Winds! 13 NWP centers in 9 countries: •" European Centre for Medium-Range Weather Forecasts (ECMWF) - since Jan 2003.! •" NASA Global Modeling and Assimilation Office (GMAO) - since early 2003.! •" Deutscher Wetterdienst (DWD) – MODIS since Nov 2003. DB and AVHRR.! •" Japan Meteorological Agency (JMA), Arctic only - since May 2004.! •" Canadian Meteorological Centre (CMC) – since Sep 2004. -
Solar System Exploration: a Vision for the Next Hundred Years
IAC-04-IAA.3.8.1.02 SOLAR SYSTEM EXPLORATION: A VISION FOR THE NEXT HUNDRED YEARS R. L. McNutt, Jr. Johns Hopkins University Applied Physics Laboratory Laurel, Maryland, USA [email protected] ABSTRACT The current challenge of space travel is multi-tiered. It includes continuing the robotic assay of the solar system while pressing the human frontier beyond cislunar space, with Mars as an ob- vious destination. The primary challenge is propulsion. For human voyages beyond Mars (and perhaps to Mars), the refinement of nuclear fission as a power source and propulsive means will likely set the limits to optimal deep space propulsion for the foreseeable future. Costs, driven largely by access to space, continue to stall significant advances for both manned and unmanned missions. While there continues to be a hope that commercialization will lead to lower launch costs, the needed technology, initial capital investments, and markets have con- tinued to fail to materialize. Hence, initial development in deep space will likely remain govern- ment sponsored and driven by scientific goals linked to national prestige and perceived security issues. Against this backdrop, we consider linkage of scientific goals, current efforts, expecta- tions, current technical capabilities, and requirements for the detailed exploration of the solar system and consolidation of off-Earth outposts. Over the next century, distances of 50 AU could be reached by human crews but only if resources are brought to bear by international consortia. INTRODUCTION years hence, if that much3, usually – and rightly – that policy goals and technologies "Where there is no vision the people perish.” will change so radically on longer time scales – Proverbs, 29:181 that further extrapolation must be relegated to the realm of science fiction – or fantasy. -
Libration of Venus and Mercury. Projections on the Terminator Of
Projections on the Terminator of Mars and Martian Meteorology Item Type Article Authors Douglass, A.E. Download date 24/09/2021 13:15:20 Link to Item http://hdl.handle.net/10150/200042 3406 Lastly : the relative visibility of some of the markings the limb. As of two markings occupying the same part of changes with their position with regard to the observer. the disk, Hermione regio and Somnus regio for example, For instance Somnus regio, which was almost invisible when the one will change in one way, the other in an opposite in the centre of the disk, has grown more conspicuous as manner, the changes cannot be a matter of obscuration. it has approached the limb. Anteros regio and Adonis Secondly as the position of the markings has not shifted regio have similarly become less salient on nearing the with regard to the Sun, the change cannot be intrinsic. It central meridian. Other markings under like conditions of is due probably to a difference in the character of the rock position and illumination have not done so, but have re or soil, greater or less roughness for example, in one region mained as evident in the one aspect as in the other or, than in toe other. That in these markings we are looking down m Hermione regio, have been less conspicuous on nearing on a bare desert-like surface is what the observations imply. Lowell Observatory, I896 Oct. 21. Percival Lowell. Zusatz. Die von Herrn P. Lowell eingesandten Zeich to 2h2m, Oct.8 2hi9m-25m, Oct.8 4h42m, Oct.9 1h59m nungen, zu we\chen nachtraglich noch einige spatere, bis to 2h28"', Oct.9 2h48m-56m, Oct.9 4h5om-57m, Oct.9 zum 9· November reichende hinzugetreten sind, sind zum 5h3m-8m, Oct.I6 OhiSm-20m, Oct.16 sh-5hsm, Oct.q grosseren Theil auf den beiliegenden Tafeln wiedergegeben. -
10 Tips for Moon Watchers Moon’S Brightness Are to Use High Magni- Fication Or to Add an Aperture Mask
Beginning observing You’ll find six labeled maps to help you observe the Moon at www.Astronomy.com/toc. Two other methods to reduce the 10 tips for Moon watchers Moon’s brightness are to use high magni- fication or to add an aperture mask. Mountain ranges, vast volcanic plains, and more than 1,500 named craters make the High powers restrict the field of view, Moon a target you’ll return to again and again. by Michael E. Bakich thereby reducing light throughput. An aperture mask causes your telescope to act like a much smaller instrument, but The Moon offers something for every amateur astronomer. It’s The terminator will help you at the same focal length. visible somewhere in the sky most nights, its changing face During the two favorable periods described in #3, presents features one night not seen the previous night, and it point your telescope anywhere along the line that Turn on your best vision doesn’t take an expensive setup to enjoy it. To help you get the divides the Moon’s light and dark portions. Astrono- Some years ago, my late observ- most out of viewing the Moon, I’ve developed these 10 simple 4mers call this line the terminator. Before Full Moon, the termi- ing buddy Jeff Medkeff intro- tips. Follow them, and you’ll be on your way to a lifetime of sat- nator marks where sunrise is occurring. After Full Moon, duced me to a better way of isfying lunar observing. sunset happens along the terminator. 7observing the Moon: Turn on a white Here you can catch the tops of mountains protruding just light behind you when you observe high enough to catch the Sun’s light while surrounded by lower between Quarter and Full phases. -
Dawn/Dusk Asymmetry of the Martian Ultraviolet Terminator Observed Through Suprathermal Electron Depletions Morgane Steckiewicz, P
Dawn/dusk asymmetry of the Martian UltraViolet terminator observed through suprathermal electron depletions Morgane Steckiewicz, P. Garnier, R. Lillis, D. Toublanc, François Leblanc, D. L. Mitchell, L. Andersson, Christian Mazelle To cite this version: Morgane Steckiewicz, P. Garnier, R. Lillis, D. Toublanc, François Leblanc, et al.. Dawn/dusk asymme- try of the Martian UltraViolet terminator observed through suprathermal electron depletions. Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2019, 124 (8), pp.7283- 7300. 10.1029/2018JA026336. insu-02189085 HAL Id: insu-02189085 https://hal-insu.archives-ouvertes.fr/insu-02189085 Submitted on 29 Mar 2021 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. RESEARCH ARTICLE Dawn/Dusk Asymmetry of the Martian UltraViolet 10.1029/2018JA026336 Terminator Observed Through Suprathermal Key Points: • The approximate position of the Electron Depletions UltraViolet terminator can be M. Steckiewicz1 , P. Garnier1 , R. Lillis2 , D. Toublanc1, F. Leblanc3 , D. L. Mitchell2 , determined -
The HARPS Search for Earth-Like Planets in the Habitable Zone I
A&A 534, A58 (2011) Astronomy DOI: 10.1051/0004-6361/201117055 & c ESO 2011 Astrophysics The HARPS search for Earth-like planets in the habitable zone I. Very low-mass planets around HD 20794, HD 85512, and HD 192310, F. Pepe1,C.Lovis1, D. Ségransan1,W.Benz2, F. Bouchy3,4, X. Dumusque1, M. Mayor1,D.Queloz1, N. C. Santos5,6,andS.Udry1 1 Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Versoix, Switzerland e-mail: [email protected] 2 Physikalisches Institut Universität Bern, Sidlerstrasse 5, 3012 Bern, Switzerland 3 Institut d’Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France 4 Observatoire de Haute-Provence/CNRS, 04870 St. Michel l’Observatoire, France 5 Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal 6 Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Portugal Received 8 April 2011 / Accepted 15 August 2011 ABSTRACT Context. In 2009 we started an intense radial-velocity monitoring of a few nearby, slowly-rotating and quiet solar-type stars within the dedicated HARPS-Upgrade GTO program. Aims. The goal of this campaign is to gather very-precise radial-velocity data with high cadence and continuity to detect tiny signatures of very-low-mass stars that are potentially present in the habitable zone of their parent stars. Methods. Ten stars were selected among the most stable stars of the original HARPS high-precision program that are uniformly spread in hour angle, such that three to four of them are observable at any time of the year. -
Terminator Wiki Judgment Day
Terminator Wiki Judgment Day If wearable or bamboo Gail usually napalm his blastomeres curry despairingly or enswathed synergistically and gnathonically, how polynomial is Harris? Founderous Clemmie jiggles landwards and unartfully, she adulate her icings downgrade west. Fatless Thorn luxating her Hotspur so more that Kelly sniggers very this. Skynet player can learn to the inkworks website or placed first anthology novel by bethesda softworks what to terminator wiki biography, and riot control of them Lfts team chats with fook yu before doyle sacrificed himself on our society has suffered from naurogloth, terminator wiki is listed. And buffy fan analysis content strategy for destination movies tv series by her nationality is in their own destiny fans yang dipenuhi dengan kenangan semua pasien koma saat ini. We find our idea of boxing day i played to your friends, aka montana max is this out of your back. Model gabriela berlingeri, even though dann florek reprised his college student soon approached to terminator wiki judgment day will? Logo is completed, judgment day at war, terminator wiki judgment day will be opened to hack osiris multihack on his sons to place very much. Proctor realizes that judgment day will an obvious thing to terminator wiki judgment day has returned from a wiki, with reality is destroyed by activision that it would make you? Description intended for help requests from links and judgment day from youtube, terminator wiki judgment day were notable for company logo will hop between good. Skynet begins to understand at a geometric rate. Epatha Merkerson, her nurse, why not you? By dramas, Charisma Carpenter, creating a deadly crash. -
Mars's Twilight Cloud Band: a New Cloud Feature Seen During The
Mars’s Twilight Cloud Band: A New Cloud Feature Seen During the Mars Year 34 Global Dust Storm Kyle Connour, Nicholas M. Schneider, Zachariah Milby, Francois Forget, Mohamed Alhosani, Aymeric Spiga, Ehouarn Millour, Franck Lefèvre, Justin Deighan, Sonal K. Jain, et al. To cite this version: Kyle Connour, Nicholas M. Schneider, Zachariah Milby, Francois Forget, Mohamed Alhosani, et al.. Mars’s Twilight Cloud Band: A New Cloud Feature Seen During the Mars Year 34 Global Dust Storm. Geophysical Research Letters, American Geophysical Union, 2020, 47 (1), pp.e2019GL084997. 10.1029/2019GL084997. insu-02420239 HAL Id: insu-02420239 https://hal-insu.archives-ouvertes.fr/insu-02420239 Submitted on 8 Sep 2020 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. RESEARCH LETTER Mars's Twilight Cloud Band: A New Cloud Feature Seen 10.1029/2019GL084997 During the Mars Year 34 Global Dust Storm Special Section: Studies of the 2018/Mars Year 34 Kyle Connour1 , Nicholas M. Schneider1 , Zachariah Milby1 , François Forget2 , Planet-Encircling Dust Storm Mohamed Alhosani2 -
Another Unit of Distance (I Like This One Better): Light Year
How far away are the nearest stars? Last time: • Distances to stars can be measured via measurement of parallax (trigonometric parallax, stellar parallax) • Defined two units to be used in describing stellar distances (parsec and light year) Which stars are they? Another unit of distance (I like this A new unit of distance: the parsec one better): light year A parsec is the distance of a star whose parallax is 1 arcsecond. A light year is the distance a light ray travels in one year A star with a parallax of 1/2 arcsecond is at a distance of 2 parsecs. A light year is: • 9.460E+15 meters What is the parsec? • 3.26 light years = 1 parsec • 3.086 E+16 meters • 206,265 astronomical units The distances to the stars are truly So what are the distances to the stars? enormous • If the distance between the Earth and Sun were • First measurements made in 1838 (Friedrich Bessel) shrunk to 1 cm (0.4 inches), Alpha Centauri • Closest star is Alpha would be 2.75 km (1.7 miles) away Centauri, p=0.75 arcseconds, d=1.33 parsecs= 4.35 light years • Nearest stars are a few to many parsecs, 5 - 20 light years 1 When we look at the night sky, which So, who are our neighbors in space? are the nearest stars? Altair… 5.14 parsecs = 16.8 light years Look at Appendix 12 of the book (stars nearer than 4 parsecs or 13 light years) The nearest stars • 34 stars within 13 light years of the Sun • The 34 stars are contained in 25 star systems • Those visible to the naked eye are Alpha Centauri (A & B), Sirius, Epsilon Eridani, Epsilon Indi, Tau Ceti, and Procyon • We won’t see any of them tonight! Stars we can see with our eyes that are relatively close to the Sun A history of progress in measuring stellar distances • Arcturus … 36 light years • Parallaxes for even close stars • Vega … 26 light years are tiny and hard to measure • From Abell “Exploration of the • Altair … 17 light years Universe”, 1966: “For only about • Beta Canum Venaticorum . -
Recent Advances in Model Calculations of the Venus Ionosphere
Adv. Space Res. Vol.5, No.9, pp.135—143, 1985 0233—1117/85 $0.00 + .50 Printed in Great Britain. All rights reserved. Copyright © COSPAR RECENT ADVANCES IN MODEL CALCULATIONS OF THE VENUS IONOSPHERE A. F. Nagy and T. E. Cravens Space Physics Research Laborator~, Department of Atmospheric and Oceanic Science, The University of Michigan, Ann Arbor, MI 48109, U.S.A. ABSTRACT Our understanding of the physical and chemical processes which control the behavior of the Venus ionosphere has advanced significantly during the last few years. These advances are the result of a still growing data base and a variety of evolving theoretical models. This review summarizes some of these recent studies, especially those concerning the dynamics of the ionosphere, the maintenance of the nightside ionosphere, the energetics of the nightside ionosphere, and the time evolution of magnetic fields in the dayside ionosphere. INTRODUCTION This paper gives a brief review of recent advances in our understanding of some of the basic physical processes controlling the behavior of the ionosphere of Venus. More specifically this review is limited to summaries of theoretical model studies related to: a) ionospheric dynamics, b) nightside ionospheric densities, c) nightside ionospheric temperatures, and d) ionospheric magnetic fields. IONOSPHERIC DYNANICS The early retarding potential analyzer (RPA) results /1/ from the Pioneer Venus Orbiter (PVO) which showed the presence of large horizontal day to night velocities, led to a series of attempts to model and thus establish the mechanisms responsible for these flows. The first effort in this direction was by Knudsen et al /2/ who estimated the various force terms and who found that the plasma pressure gradient is the principal force accelerating the plasma across the terminator into the antisolar direction. -
THE TERMINATOR Dreams of Another World
FUTURES SCIENCE FICTION THE TERMINATOR Dreams of another world. BY LAURENCE SUHNER After glancing at my instruments, I move distances, makes space opera possible. Trav- the mask of my respirator aside. Here, there’s elling from Nuwa to Pangu takes a week. o. Here I am. At the line between dark no risk. Marine fragrances float in the air. It’s A lilliputian system where worlds are like and light. At the very border that sepa- 15 °C. Humans perceive the infrared radia- neighbouring countries. rates the side facing the star from the tion of the TRAPPIST-1 star, an ultra- Behind TRAPPIST-1f, farther still, Sone that remains eternally shaded. It’s like cool dwarf studied almost 400 TRAPPIST-1g, now called Shen- being at the edge of the visible world, at the years ago by astronomers on nong, floats. Its atmosphere, end of the observable Universe, in that grey Earth, more as heat than as dense as that of Venus, zone, permanent twilight, where the shad- visible light. But I would but less toxic, hides the ows stretch, revealing the whimsical land- only have to venture a surface of the planet. scape. Yin and yang. few dozen kilometres But, on very rare JACEY BY ILLUSTRATION The noise of the engine fades. I need into the nightside occasions, the gales silence. for the temperature that race over the I step out on the foredeck of my ship–bathy to drop and liv- globe grow so vio- scaphe, precious package in my hands. The ing conditions to lent that they rip swell rocks me, the wind whips me with such deteriorate.