Just spell out the terms, especially for those encountered .... uses language that describes ACE higher. Technically what the authors say is correct and ...

ON THE DETERMINATION OF SOLAR E W EMISSION ALTITUDES. USING THE EARTH As AN OCCULTING DISK. S. 0. Kastner and C. L. wolff ace Flight Center elt, Maryland ...

Comparisons between HIRDLS and ACE-FTS Cora Randall & Lynn Harvey and the HIRDLS team Aura Science time ACE-FTS data. #12;Atmospheric Chemistry Experiment Fourier Transform Spectrometer Launched.) #12;ACE-FTS Validation Status (v1.0) Ozone �10%, Solar Occultation, 15-40 km NO2 0-10% lower ...

This paper presents extensive validation analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation ...

Stratospheric methane (CH4) profiles have been derived from solar occultation measurements of the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) on ENVISAT with an updated version of the Onion Peeling DOAS (ONPD) method. The SCIAMACHY solar occultation measurements cover the ...

... Accession Number : AD0677560. Title : THE OCCULTATION OF THE CRAB NEBULA BY THE SOLAR CORONA IN JUNE, 1960. ...

... Accession Number : AD0428675. Title : OCCULTATION OF THE CRAB NEBULA BY THE SOLAR CORONA IN JUNE 1963,. ...

ACE (also known as SCISAT) is making a comprehensive set of simultaneous measurements of numerous trace gases, thin clouds, aerosols and temperature by solar occultation from a satellite in low earth orbit. A high inclination low earth orbit gives ACE coverage of tropical, mid-latitudes and polar regions. The ...

Orbital characteristics and launch vehicle requirements for a solar occultation experiment measuring

absorption spectrometry. Its design was based on that of the ATMOS ... the composition of the Earth's atmosphere by solar occultation spectrometry. The ...

Atmospheric Composition Measured by Solar Occultation Spectrometry. Geoffrey Toon, Bhaswar Sen, and Jean-Francois Blavier ...

Observations of Chlorine and Ozone Evolution in the Lower Stratosphere during the 2005-2006 Arctic Spectrometer (FTS) measures the two main chlorine reservoir species, HCl and ClONO2, by solar occultation measures HCl, and ClO, the primary reactive form of chlorine. Figure 2 shows equivalent latitude (Eq

ACE (also known as SCISAT) is making a comprehensive set of simultaneous measurements of numerous trace gases, thin clouds, aerosols and temperature by solar occultation from a satellite in low earth orbit. A high inclination (74 degrees) low earth orbit (650 km) gives ACE coverage of tropical, mid-latitudes and ...

The Atmospheric Chemistry Experiment has been in orbit since its launch on 12 August 2003. ACE is a Canadian-led satellite mission, also known as SCISAT, which carries two instruments, the Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation ...

The Canadian satellite SCISAT-1 developed for the Canadian Space Agency in the context of the ACE mission (Atmospheric Chemistry Experiment) was launched in August 2003. The mission has been a tremendous technical and scientific success. The main instrument of the ACE mission is a high-resolution Fourier Transform Spectrometer (FTS) designed and built by ...

The Canadian ACE (Atmospheric Chemistry Experiment) mission has a high resolution (0.02 cm-1) Fourier transform spectrometer (FTS) in low earth orbit. The primary ACE mission goal is the study ozone chemistry in the stratosphere although it is making a wide range of other measurements, for example, of organic molecules in the troposphere. In the normal ...

A new retrieval method has been developed to derive water vapour number density profiles from solar occultation measurements of the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY). This method is intentionally kept simple and based on a combination of an onion peeling approach with a modified DOAS (Differential Optical ...

A new retrieval method has been developed to derive water vapour number density profiles from solar occultation measurements of the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY). This method is intentionally kept simple and based on a combination of an onion peeling approach with a modified DOAS (Differential Optical ...

Sharp gradients in concentrations near sunrise/sunset conditions can lead to asymmetric distribution of species along the line of sight (LOS) in a solar occultation experiment. Model derived correction factors have been used for stratospheric NO and NO2 retrievals in HALOE and ATMOS experiments. Mesospheric ozone also exhibits such inhomogeneity along ...

One of the most abundant chlorine-containing molecules in the atmosphere is methyl chloride; a species whose sources are almost entirely natural. The most common sources of methyl chloride are tropical plants, senescent or dead leaves and biomass burning. As the impacts of the Montreal Protocol and its subsequent amendments are becoming apparent in the reduction of chlorofluorocarbons in the ...

We are proposing a small mission that will bridge the stratospheric and upper tropospheric trace gas measurement gap between the end of the EOS Aura mission (2013-15) and the Decadal Survey Global Atmospheric Composition Mission (2020) as well as the gap in solar irradiance measurements between Glory (scheduled launch in December 2008) and the NPOESS C3 mission (2020). This ...

Oct 22, 2010 ... The Advanced Composition Explorer (ACE) spacecraft was designed to ... ACE Facts ACE's instruments can give about one hour's notice of an ...

IntroductionIntroduction In our first analysis, the ACE-FTS occultations from 21 February 2004 observation. The Atmospheric Chemistry Experiment (ACE), also known as SCISAT-1, is supported primarily Experiment (ACE) satellite. These results are compared with those from the MkIV interferometer and from two

ACE+ is an atmospheric sounding mission using radio occultation techniques and is a combination of the two Earth Explorer missions ACE and WATS earlier proposed to ESA. ACE was highly rated by ESA in the Call for Earth Explorer Opportunity Missions in 1999 and was prioritised as number three and selected as a ...

Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) solar occultation measurements have been used to create volume mixing ratio (VMR) profiles of H2O, CH4, and N2O inside and outside the 2004 Arctic vortex. Using derived meteorological quantities such as potential vorticity, we have classified 450 ...

Ozone profiles from solar occultation instruments provide invaluable information that can be used to

... Descriptors : (*SOLAR CORONA, SCIENTIFIC RESEARCH), (*NEBULAE, EXTRATERRESTRIAL RADIO WAVES), (*EXTRATERRESTRIAL RADIO ...

We have compared volume mixing ratio profiles of atmospheric trace gases measured by the Atmospheric Chemistry Experiment (ACE) version 2.2 and the MkIV solar occultation Fourier transform infrared spectrometers. These gases are H2O, O3, N2O, CO, CH4, HNO3, HF, HCl, OCS, ClONO2, HCN, CH3Cl, CF4, CCl2F2, CCl3F, COF2, CHF2Cl, and SF6. ...

The Atmospheric Chemistry Experiment-Fourier Transform (ACE-FTS) aboard the Canadian satellite SCISAT (launched in August 2003) was designed to investigate the composition of the upper troposphere, stratosphere, and mesosphere. ACE-FTS utilizes solar occultation to measure temperature and pressure as well as ...

Both in-situ and remote measurements of the isotopic composition of water vapor have been used in recent years to infer the influence on convection on water vapor in the UTLS region. Isotopic enhancements have been assumed to be the result of addition of water from convective ice, and conversely, seasonal variation in isotopic composition has been assumed to result from annual variation in ...

The Atmospheric Chemistry Experiment (ACE) was successfully launched on August 12, 2003, into a 73.9 degree inclined orbit at an altitude of 650 km onboard a U.S.-supplied Pegasus XL vehicle. The primary goal of the ACE mission is to measure solar occultation spectra from the UV to mid-infrared for a minimum of ...

Measurement of short-lived photochemically-produced species in the stratosphere by solar occultation

Solar occultation spectrometry has the high SNR and spectral resolving power necessary to: "Identify weak absorptions due to trace gases and minor ...

The Atmospheric Chemistry Experiment (ACE) mission was launched in August 2003 to sound the atmosphere by solar occultation. Carbon monoxide (CO), a good tracer of pollution plumes and atmospheric dynamics, is one of the key species provided by the primary instrument, the ACE-Fourier Transform Spectrometer ...

Volatile organic compounds (VOCs) are responsible for air pollution. In recent years it has become possible to detect tropospheric VOCs using satellite instruments such as the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS). The ACE-FTS is a high resolution (0.02 cm^{-1}) instrument covering the 750-4400 cm^{-1} spectral range in ...

The Atmospheric Chemistry Experiment (ACE) mission was launched in August 2003 to sound the atmosphere by solar occultation. Carbon monoxide (CO), a good tracer of pollution plumes and atmospheric dynamics, is one of the key species provided by the primary instrument, the ACE-Fourier Transform Spectrometer ...

The ACE mission goals are: (1) to measure and to understand the chemical and dynamical processes that control the distribution of ozone in the upper troposphere and stratosphere, with a particular emphasis on the Arctic region; (2) to explore the relationship between atmospheric chemistry and climate change; (3) to study the effects of biomass burning in the free ...

The ACE mission goals are: (1) to measure and to understand the chemical and dynamical processes that control the distribution of ozone in the upper troposphere and stratosphere, with a particular emphasis on the Arctic region; (2) to explore the relationship between atmospheric chemistry and climate change; (3) to study the effects of biomass burning in the free troposphere; ...

Apr 14, 2010 ... "Our estimates from ACE and STEREO are in good agreement with data from ... The prime objective of NASA's ACE spacecraft, launched in 1997, ...

Oct 22, 2010 ... ACE. Goals: The Advanced Composition Explorer (ACE) was designed to study the constant stream of particles that bombard the Earth from the ...

Earth-based observations of stellar occultations provide extremely high spatial resolution for bodies in the outer solar system, about 10,000 times better than that of traditional imaging observations. Stellar occultation data can be used to establish the...

Solar occultation near-IR spectrometer trace gas. Millimeter-wave limb sounder. Satellite-to-satellite occultations, solar occultations, limb emission. Thermal IR ...

Advanced Composition Explorer (ACE) Solar Wind Ion Composition Spectrometer ( SWICS) and Solar Wind Ion Mass Spectrometer (SWIMS) Level 2 Data ...

As part of the Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia), the upward and

This site presents graphic plots of solar wind and magnetic field data from the Advanced Composition Explorer (ACE) spacecraft.

Aug 19, 2011 ... Description. The objective of the Advanced Composition Explorer (ACE) is to collect observations of particles of solar, interplanetary, interstellar ...

This paper presents the first global set of observations of CO2 in the mesosphere and lower thermosphere (MLT) obtained by the ACE-FTS instrument on SCISAT-I, a small Canadian satellite launched in 2003. The observations use the solar occultation technique and document the fall-off in the mixing ratio of CO2 in the MLT region. The ...

This paper presents the first multi-year global set of observations of CO2 in the mesosphere and lower thermosphere (MLT) obtained by the ACE-FTS instrument on SCISAT-I, a small Canadian satellite launched in 2003. The observations use the solar occultation technique and document the fall-off in the mixing ratio of CO2 in the MLT ...

The Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS) aboard the Canadian satellite SCISAT (launched in August 2003) was designed to investigate the composition of the upper troposphere, stratosphere, and mesosphere. ACE-FTS utilises solar occultation to measure temperature and pressure as ...

Language: English ...

The Pinhole/Occulter Facility is a powerful tool for studying the physics of the extended corona and

SCIAMACHY(Scanning Imaging Absorption spectroMeter for Atmospheric ChartographY) onboard the European Space Agency's ENVIronmental SATellite (ENVISAT) observes the earth's atmosphere in the nadir, limb and solar/lunar occultation geometry in UV-NIR (240nm - 2380nm) spectral range. The instrument provides total columns as well as vertical profiles of the ...

ACE SIS Solar Isotope Spectrometer (SIS) intensities and counts, for 8 elements at 1-hour ... ACE Solar Isotope Spectrometer (SIS) Level 2 data Home Page ...

Aug 19, 2008 ... Radio Occultation: Unraveling Saturn's Rings Date: 3 May 2005. Specially designed Cassini orbits place Earth and Cassini on opposite sides ...

Pioneer 6 S band telemetry carrier Faraday rotation during corona occultation measured by deep space

A Pinhole Occulter Facility. This facility is designed for ..... Pinhole/ Occulter Facility and the Solar Soft X-Ray Telescope share equal ...

We propose a unique coronagraphic approach to image exoplanets; an external occulter plus a hybrid telescope operating on the moon, a heliostat-like telescope design with an external occulter.

For nearly ten and one-half years, NSG-7603 provided the basic support for a program of solar system

Coronal magnetic bottle at ten solar radii from Faraday rotation measurements of occulted spacecraft

The Pressure of a Solar Storm. The ACE satellite measures the density and speed of the solar wind as it approaches Earth, and also measures ...

Spinning at five revolutions per minute, it will investigate the origin and evolution of solar phenomenon, the formation of the solar corona, solar flares ...

Major limitations of our present knowledge of the global distribution of CO2 in the atmosphere are the uncertainty in atmospheric transport and the sparseness of in situ concentration measurements. Limb viewing spaceborne sounders such as the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) offer a vertical resolution of a few kilometres for profiles, ...

Advanced Composition Explorer (ACE) observes particles of solar, interplanetary, interstellar, and galactic origins, spanning the energy range from solar ...

Advanced Composition Explorer (ACE) observes particles of solar, interplanetary , interstellar, and galactic origins, spanning the energy range from solar wind ...

Aug 11, 1997 ... Description: Extension of the solar panels is tested on the Advanced Composition Explorer (ACE) spacecraft in KSC's Spacecraft Assembly and ...

Haflidi Jonsson (Naval Postgraduate School, Monterey, CA 93943) ... In the ACE 2 program the solar radiant fluxes were measured on the Pelican aircraft and ...

Feb 20, 2011 ... ACE Weimer propagated solar wind data and linearly interpolated to have the measurements on the minute at 60 s resolution SWEPAM data in GSM ...

Solar wind archive at UCLA. This archive provides a list of available data resources and ... IGPP UCLA ACE Plasma Data JMW Processed Solar Wind Archive ...

We summarize a planetary decadal survey white paper describing the rationale for and key elements of a dual satellite orbiting mission (DSM) concept called the Mars Astrobiology and Climate Observatory (MACO). MACO uses mm-wavelength satellite to satellite (sat-sat) occultations in combination with solar occultations (SO) to answer and ...

MIOSOTYS (Multi-object Instrument for Occultations in the SOlar system and TransitorY Systems) is a multi-fiber positioner coupled with a fast photometry camera. The objective is to probe the Kuiper Disk through serendipitous stellar occultations.

Occultations of stars by planets, satellites, planetary ring systems, and asteroids offer opportunities to study the occulting bodies in ways not otherwise possible from the surface of the Earth. For example, one can detect even an extremely tenuous atmos...

The Halogen Occultation Experiment (HALOE) is a solar occultation experiment that will fly on the Upper Atmosphere Research Satellite to measure mixing ratio profiles of O3, H2O, NO2, NO, CH4, HCl, and HF. The inversion of the HALOE data will be criticall...

Astrometric observations of radio source occultations by solar system bodies may be of large interest for testing gravity theories, dynamical astronomy, and planetary physics. In this paper, we present an updated list of the occultations of astrometric ra...

The outer solar atmosphere exhibits a great variety of dynamic and energetic plasma phenomena, from the catastrophic energy release of solar flares to the steady acceleration of the solar wind. The Pinhole/Occulter Facility contains the instruments necess...

This paper presents extensive {bias determination} analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation ...

SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) onboard the European Space Agency's ENVIronmental SATellite (ENVISAT) observes the earth's atmosphere in nadir, limb and solar/lunar occultation geometry covering the UV to NIR (240nm -2380nm) spectral range. The instrument is dedicated to improve our knowl-edge in ...

During the last 20 years, several contiguous satellite missions have recorded the vertical distribution of stratospheric and upper tropospheric ozone at 1-3 km vertical resolution. Among them, several are based on the solar occultation technique, either in the visible or the infrared spectral range. Operating from 57� inclination orbits, NASA's ...

One of the most abundant chlorine-containing molecules in the atmosphere is methyl chloride; a species whose sources are almost entirely natural. The most common sources of methyl chloride are tropical plants, senescent or dead leaves and biomass burning. As the impacts of the Montreal Protocol and its subsequent amendments are becoming apparent in the reduction of chlorofluorocarbons in the ...

The first global set of observations of the ground state CO2 in the mesosphere and lower thermosphere (MLT) obtained by the ACE-FTS instrument on a small Canadian satellite SCISAT-I is presented in this study. The observations use the solar occultation technique and document the fall off in the mixing ratio of CO2 in the MLT region. ...

The Atmospheric Chemistry Experiment - Fourier Transform Spectrometer (ACE-FTS) aboard the Canadian satellite SCISAT was designed to measure the composition of the upper troposphere, stratosphere, and mesosphere. It uses the solar occultation technique and has produced high precision observations since February 2004. ...

The ACE-FTS is a high resolution (0.02 cm-1) Fourier transform spectrometer which takes measurements over the 750-4400 cm-1 (2.2 to 13.3 �m) spectral region. It is one of two instruments on board the Canadian SCISAT-1 satellite which was launched on the 12 August 2003 and has now been measuring the atmosphere for ~6.5 years. ACE-FTS is a ...

The increasing amounts of reactive nitrogen in the stratosphere necessitates accurate global measurements of stratospheric nitrogen dioxide (NO2). Over the past decade, the SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) instrument on ENVISAT (European Environmental Satellite) has been providing global coverage of stratospheric NO2 every 6 days, which is otherwise ...

The characteristics of the populations of objects that inhabit the outer solar system carry the fingerprint of the processes that governed the formation and evolution of the solar system. Occultation surveys push the limit of observation into the very sma...

The Chemical and Aerosol Sounding Satellite (CASS) mission is a proposed CSA-NASA collaboration to address the Committee on Earth Observation Satellites (CEOS) recommendation for continuity in climate-quality profile measurements of stratospheric and upper tropospheric composition. The mission would include two instruments: an infrared Fourier transform spectrometer ...

Occultations of stars by planets, satellites, planetary ring systems, asteroids, and comets provide valuable opportunities to probe the Solar System in ways otherwise impossible from the surface of the earth. For example, one can precisely measure the siz...

Work on completing our analysis of the Voyager UVS solar occultation data acquired during Neptune encounter is essentially complete, as testified by the attached poster materials. The photochemical modeling addresses the recent revision in branching ratio...

An instrument was designed for solar occultation measurements of the martian atmosphere from the Phobos spacecraft. It was composed of three different dispersive systems working in the ultraviolet (UV: 0.22-0.32 microns) for the measurement of O3 and aero...

The only operation that an ACE may perform on the RWA arbitration relays .... one set of ACE arbitration hardware signals, and monitoring the other. ...

Atmospheric Chemistry Experiment (ACE) Arctic stratospheric measurements of NOx during February and March 2004: Impact of intense solar flares ...

Aug 5, 2010 ... Instrument: ACE Solar Wind Electron, Proton and Alpha Monitor (SWEPAM) ... with an average radius of 100 mm and a plate spacing of 2.84 mm. ...

Time variable dispersion of Crab Nebula pulsar, showing coincidence with occultation by solar corona

Bodies inhabiting the outer solar system are of interest because, due to the colder conditions, they

... between conductive heat transfer with the air temperature, absorbed long- wave and solar radiation and the long-wave radiation emission of the sensor. ...

... between conductive heat transfer with the air temperature, absorbed long- wave and solar radiation and the long-wave radiation emission of the sensor. ...

STUDY of the solar occultation of the Taurus A radio source has yielded new information concerning the structure of the solar corona at large distances1; however, the interpretation of the observations is somewhat hampered by lack of knowledge of the electron densities prevailing in the corona at the time of the ...

The Solar Occultation FTS for Inclined-orbit Satellite (SOFIS) is a solar occultation Fourier transform spectrometer (FTS), developed by the Ministry of the Environment (MOE) of Japan, that will be onboard the Global Change Observation Mission-A1 satellite. We describe the performance test results of the laboratory ...

Feb 15, 2001 ... The location of ACE at the L1 libration point between the earth and the sun enables ACE to give about a one hour advance warning of ...

L1 libration point between the earth and the sun will enable ACE to give about ... NOAA has arranged for the transmission of a subset of data from four ACE ...

Apr 3, 2010 ... Solar wind plasma data (SWEPAM) and magnetic field data (MAG) are downloaded from ACE science center. Data can be propagated from ACE to ...

Correlations between long-lived species provide a useful tool for investigating both dynamical and chemical processes in the atmosphere. Global tracer-tracer correlations between total odd nitrogen (NOy) and N2O, and between NOy and O3 have been studied using measurements made by the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) on the Canadian ...

Hydrogen chloride (HCl) and hydrogen fluoride (HF) are respectively the main chlorine and fluorine reservoirs in the Earth's stratosphere. Their buildup resulted from the intensive use of man-made halogenated source gases, in particular CFC-11 (CCl3F) and CFC-12 (CCl2F2), during the second half of the 20th century. It is important to continue monitoring the evolution of these source gases and ...

Hydrogen chloride (HCl) and hydrogen fluoride (HF) are respectively the main chlorine and fluorine reservoirs in the Earth's stratosphere. Their buildup resulted from the intensive use of man-made halogenated source gases, in particular CFC-11 (CCl3F) and CFC-12 (CCl2F2), during the second half of the 20th century. It is important to continue monitoring the evolution of these source gases and ...

The planetary occultation program began at Lowell Observatory in 1973 with a worldwide campaign to observe mutual occultations and eclipses of the Galilean Satellites. Then the temperature profile of the Martian atmosphere was measured from data taken during the occultation of epsilon Geminorum, the Rings of Uranus were discovered as ...

Bodies residing in the outer solar system exhibit unique physical processes, and some of the lessons

S-band time delay measurements were collected from the spacecrafts Helios A and B during three solar

The use of stellar occultations to disclose unknown aspects of our Solar System is not new. But the latest such event to be reported involves an object that lies beyond the orbit of Neptune - and is a first.

Jan 24, 2011 ... UV and IR Spectrometer for solar/stellar occultation and Nadir Observations ( SPICAV/SOIR) SPICAV/SOIR is searching for the small quantities ...

Results from two retrieval algorithms, o3-aer and o3-mlr , used for SAGE III solar occultation ozone

granulation, and other solar features (sunspots, flares). L2-View: EASI. Earth Atmosphere Solar-Occultation Imager. Goals: Measure altitude profiles for 5 ...

... FOR SPACECRAFT SOLAR OCCULTATION EXPERIMENTS IN THE NEAR IR, UV, AND VISIBLE REGION, IN: NASA-CP-2004, PWA6-1/WA6-4. ...

32. The Pressure of a Solar Storm. The ACE satellite measures the density and speed of the solar wind as it approaches Earth, and also measures the strength ...

The Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO) instrument on the SCISAT satellite is a simple, compact spectrophotometer for the measurement of atmospheric extinction, ozone, nitrogen dioxide, and other trace gases in the stratosphere and upper troposphere as part of the Atmospheric Chemistry Experiment ...

The Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO) instrument on the SCISAT satellite is a simple, compact spectrophotometer for the measurement of atmospheric extinction, ozone, nitrogen dioxide, and other trace gases in the stratosphere and upper troposphere as part of the Atmospheric Chemistry Experiment ...

Sep 15, 2006 ... And this is not just any solar occultation; it's a very long one. ... occultations in the mission typically last only an hour, this time it will last ... shows the relative path of the Sun as it passes behind the planet. ...

Describes occultation events involving the moon, when the moon blocks the view of planets or stars. Describes other events such as a partial solar eclipse, a penumbral lunar eclipse, meteor showers, and moon phases. Provides a list of internet resources related to these events. (DLH)

A search for occultations of stars by Uranus, Neptune, and Pluto between 1990 and 1999 was carried out by combining ephemeris information and star positions using very accurate occultation modeling software. Stars from both the Space Telescope Guide Catalog and photographic plates taken by Arnold Klemola at Lick Observatory were compared with planet ...