... With enough velocity, a spacecraft can break loose from the Earth's gravity and enter an orbit around the Sun, like that of a planet. If it then orbits the Sun with the same period as the Earth--one year--it may keep a fixed position relative to Earth. ... If the distance is just right--about 4 times the distance to the Moon or 1/100 the distance to the Sun--the spacecraft, too, will need just one year to go around the Sun, and will keep its position between the Sun and the Earth. ...

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• Trigonometry beyond 90 degrees
• The Lagrangian Point L1
• INTERBALL IB_TAIL landing point coordinates

... Direct data transmission rate (Mbps) . ... the density of electron fluexs with energies in four bands from 0.04 MeV to 1.7 MeV; . ... sensor (TV, IR) data and heliogeophisical information (HGI) transmission to data receiving and processing centers at a rate of up to 2.56 Mbps; . ... 1.76 GHz - TV- and heliogeophysical information and DCLI's data transmission to data receiving and processing centers; . 7.5 GHz - TV- and heliogeophisical data transmission to data receiving and processing centers; . ...

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... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...

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• ST-ECF Grism Spectrum Software for NICMOS Grism Data
• The Photometric Performance of the NICMOS Grisms
• VLT First Light

Once students get the hang of it, they can find and measure the brightness of Delta Cephei in a few minutes. ... of Delta Cephei . ... Oct. ... The following table lists the measurements of Delta Cephei made by one amateur astronomer in autumn 1990. ... 4.0 . ... This activity is a simplified version of one that appeared in Hands-On Astrophysics, a series of activities prepared by the American Association of Variable Star Observers with support from the National Science Foundation. << previous page | ...

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• ASP: Indiana Jones and the Astronomers of Yore
• ASP: To Every Season There is a Reason
• ASP: Point: Where Is the Best Place to View a Solar Eclipse?

. Computer Ephemeris. Lunar eclipse numerical map. Explanations. First portion of the page contains coordinates of sub-lunar points during the eclipse. Every point is represented with two numbers: geodetic longitude and geodetic latitude, both in degrees. Second portion of the page contains coordinates of the points at terminator line for the moments of contacts. There are 360 points on the lines, tens of them per line. The starting angle is indicated in the leftmost column.

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• Space Geodesy
• Spherical and Practical Astronomy
• Introduction to Astronomy

Taking into account the result by Watanabe P=2.5 days in outburst, I reconstruct old set of photographic observations being partly lost, and add some new observations. ... The periodogram calculated with the method by Lafler and Kinman is shown. ... The last periodogram indicates peaks corresponding following possible periods with the double-wave light curve: 0.4236, 0.4650, 0.5379, 0.6064, 0.7365, 0.871, 1.168, 1.5437, 2.8173, and 6.89 days. ...

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• Stream 1/0
• Times Up!!
• Advanced Pointer Topics

... This program was created for correlating chosen regions in the series of fts images. ... Chosen regions' . ... In this section the program counts the integral for each region of the grid for each image. ... As a matter of fact, the integral is total brightness of the region and it is counted by 'int_tabulated' IDL function. ... In addition, the program will show the count of the regions which correlate with the corresponding region (the brighter region means the bigger count) and its contour. ...

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• прогноз параметров вращения Земли

... The Zenit-SM Launch Complex . ... INJECTION PROFILE . ... LAND LAUNCH . ... 1-st burn of Block DM-SLB (Injection into reference orbit) . 2-nd burn of Block DM-SLB (Injection into transfer orbit) . 3-rd burn of Block DM-SLB (Injection into target orbit) . ... TM-data reception in real time with US main engine second burn is provided by the mobile measurement station developed by RSC Energia, located in Abidjan, Kot-d'Vuar Republic. ... Official WEB-site of S.P.Korolev RSC Energia . ...

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• RSC "Energia" - Land Launch

... They are concerned with Attitude Control System of the spacecraft, satellite visibility from tracking stations, limits on the satellite autonomous operations during the orbit, and needs for auxiliary operations with the spacecraft. ... Among the operational constraints the most important one is the number of programmed slews per orbit, which determines the maximum number of radio sources to be observed during one orbit. ... System temperature (K) . ... Progress of the RadioAstron Project in Pictures...

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• RadioAstron Mission Element Overview
• Contingency Plans
• Project SUBMILLIMETRON

... AstroCC is a coordinate conversion utility for astronomy. It accepts an object designation or the coordinates of an object and calculates coordinates in alternative systems, and at different dates, times, and locations. It also provides lunar and bright planet coordinates to aid in planning observations. ... BJD values may also be retrieved from http://astroutils.astronomy.ohio-state.edu/time/utc2bjd.html which is based on Eastman et al. ... Coordinate data are obtained from SIMBAD. ...

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• PointRoi (ImageJ API)
• Wand (ImageJ API)
• Interpreter (ImageJ API)

... Espa†‘ol (Chile) . ... Subscribe Contact Site Map . ... ESO, the European Southern Observatory . ... ESO's Governing Bodies . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to Paranal . ... ESO Acronyms . ... Survey Telescopes . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... ESO 1-metre Schmidt telescope . ... 50 years of ESO in Chile . ... A map of northern Chile, with the location of Cerro Paranal indicated. ... Cerro Paranal , Chile , Map , Paranal . ...

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• A visual tour
• NPOI Lab
• Dispersion correction

... It will automatically identify any fuzzballs in this picture. It will then randomly select one of these fuzzballs, and get a spectrum of it. ... A declination of 90 will find you a fuzzball directly overhead. ... Once you pick a region, press the "find and measure" button and your automatic telescope will search for a fuzzball near these coordinates. ... If you hit the "find and measure" button repeatedly at the same coordinates, the telescope will keep on finding new fuzzballs near this position. ...

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• Siding Spring Survey
• Telescope pointing system
• Siding Spring Observatory's 2.3 m telescope (wide and high vantage point)

... BOM2 and the basic block of solar limbograph including pointing and control systems ? ... Fine tracking platform (FTP) for Sun tracking by the sight axis of the limbograph; . ... Tracking system frequency ? ... Controller of the control system and solar fine tracking of the sight axis of the limbograph; . ... The basic relative construction of the elements and instrumental blocks of the "Astrometria" space experiment is shown on the block diagram of units within the complex of SL-200 solar...

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• The conference " Multi-Wavelength investigations of the Sun and modern problems

SINGULAR POINTS IN THE SOLAR CHROMOSPHERE . ... In the structure of the solar chromosphere, containing information on the configuration of the magnetic field, we have found and identified all the main types of the singular points ( see Fig. 1 ), which are known as inherent features of the 2-D vector field. ... The main types of the singular points are the node, the focus, the center, and the saddle. ... Singular point of the focus type in the solar chromosphere. ...

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• Large_Scale Emitting Chains
• IZMIRAN: Laboratory for Physics and modeling of the ionosphere - publications -

... Flux density at 1 GHz (/Jy): 28 . ... Radio: Shell, brightest to the S. Optical: Filaments correspond well to the radio shell, brightest in SE. X-ray: Brightest to NW, with point source near centre. Point sources: Central, variable X-ray source, and nearby pulsar. ... Molonglo at 408 MHz (3') and Parkes 64-m at 5 GHz (4'). ADS . ... ASCA observations of compact X-ray source. ... X-ray variability of central source. ... ATCA at 1.4 GHz (50''), including H I absorption to central source. ...

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• A water maser search towards colour-selected IRAS point sources
• G320.4-1.2
• G327.6+14.6

In this method the fields outside and inside a particle are represented by expansions in term of proper basis functions (practically always the vector spherical harmonics). Since the particle surface does not coincide with the coordinate surface, it is impossible to satisfy the boundary conditions exactly, and the expansions are limited by a finite number of terms, and the boundary conditions are considered in a finite set of points (matching points). ...

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• Conference location | Radiation mechanisms of astrophysical objects: classics
• Linear polarization: wavelength dependence
• INI main page

Guest Editorial , July 2006 . Past ? Present ? Future . ... SETI, the quest for reasonable signals from Space, is aimed at the Past. ... From here on Earth, we can say with good reason that conducting both searches (SETI) and transmission (METI) of reasonable signals, we appear poised just halfway between the Past and the Future: namely, in the Present! ... This editorial was submitted in response to Their Past, Our Future , by SETI League executive director emeritus H. Paul Shuch. ...

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• EIT Reconstruction Paper 1
• Getting Started in Actor Prolog. Analyzing Web Sites.

... DIAGNOSTICS OF IONOSPHERIC IRREGULARITY SPECTRUM USING MEASUREMENTS OF RADIO WAVE ANOMALOUS ATTENUATION UNDER VERTICAL SOUNDING . ... The selected experimental data are characterized by a high average level of attenuation of a signal of vertical sounding (10 dB and above), which cannot be caused by collisional absorption of radio waves (practically absent in a dark time of day) and, hence, being a consequence of scattering on random irregularities. ... ATTENUATION OF A VERTICAL SOUNDING SIGNAL . ...

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• Vertical Structure, figures
• BETTER ECHO-
• Vladimir Marsakov Publication List

The purpose of the space-physics lab exercises is to introduce the students to the methods of the measurements, to the modern conception of near-Earth space structure and the physical processes and phenomena occured in it. ... At present the reasearches and the teachers of the University and of other institutes participating in the project continue development of the the special space-physics lab exercises, and they are interested in your ideas concerning the future exercises. ...

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• University Satellites and Space Science Education '2006

Microsymposium 38, MS083, 2003 (A4 format) MERCURY: LOCAL VARIATIONS OF THE PHOTOMETRIC RELIEF. ... Because of trajectory and pointing angle constraints the planet could be observed from Mariner 10 only over a small range of phase angles between about 75o and 110o. Therefore the photometric investigations are restricted to measuring the distribution of brightness on the Mercurian disk. ... Raw versions of real-time processing pictures FDS 0000984 and FDS 0000986 were used (images 196 and 202). ...

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• http://selena.sai.msu.ru/Bus/Publications/m44_14_busarev_etal.pdf
• Vladimir V. Busarev