... astro-ph . ... Whitespace-separated words are treated as AND ed. Show 10 50 100 articles per page in Full Compact mode . ... Quasar Variability in the Framework of Poissonian Models . ... It is shown that in this very general framework the well established anti-correlation between variability amplitude and wavelength can only be understood as an effect of an underlying spectral component which remains stable on long time-scales, and is redder than the variable component. ...

... Exposure Time . ... 2000 May 27 . ... 2000 Jun 03 . ... 2000 Dec 10 . ... log N -log S in the soft (0.5 2 keV), hard (2 10 keV), and very hard (5 10 keV) bands from the 1 Ms observations of the CDF-S. The shaded areas indicate uncertainties due to the Poisson statistics (1 ) and the choice of the conversion factor (corresponding to a power law spectrum with = 1.4 0.3). ... Soft [0.5-2 keV] . ... Soft band [0.5-2] keV .. ... Hard band [2-10] keV .. ... Exposure maps . ... Exposure map [0.5-2] keV .. ...

Crater Gassendi . ... I made this drawing was made on the 26th of november 2001. If you compare this one with the previous drawing of Gassendi (below) the differences are clear. ... This drawing was made on the 28th of september 2001. After nearly a full month without observations I had a one hour gap between the thicker clouds. ... This drawing was made on the 29th of august 2001. ... This drawing was made on the 27th of august 2001. ... This drawing was made on the 25th of august 2001. ...

... First, we computed the mean errors of orbit parameters on the assumption of the linear connection of them with observation errors and then we compared obtained estimates with those resulting from the assumption of the nonlinearity of this connection. Secondly, we correlate orbital parameters and their errors obtained by the method of the least modulus with those obtained by the least-squares method. ...

... Field of interest: data analysis and interpretation of X-ray observations of BHC and NS systems, astrophysics of compact objects and related phenomena: X-ray , optical and radio observations , shocks and stellar winds, emission mechanism, the spectral and timing analysis of the X-ray emission from microquasars ( signature of accreting BH), atoll- and Z-sources ( signature of accreting NS), modeling of INTEGRAL images % . ...

T he Siding Spring Survey (SSS) is a Near-Earth Object search program that utilises the 0.5-m Uppsala Schmidt Telescope at Siding Spring Observatory, N.S.W., Australia. ... The mission of the Siding Spring Survey is to contribute to the inventory of near-earth objects (NEOs), or more specifically, the potentially hazardous asteroids (PHAs) and comets (PHOs) that may pose a threat of impact and thus harm to civilization. ... Based on the CSS Mission page . ... Siding Spring Survey Main Page . ...

Astronomy Discussion Forums . Forums: . ... FURTHER EXPLANATION [NWOBU'S EFFECT] . ... Post Message | ... In the absence of an optical effect [Nwobu’s effect], every observer's clock will agree with one another, that is, every observer will obtain an absolute time. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... the time of observation . ... Observing the Changing Position of the Sun To Establish Cardinal Directions . ... Observations of the Sun's apparent movement across the sky and its pattern of rising and setting in the east and west horizon helped to establish the cardinal directions. ... The final stage of the Sun's return was marked by the observation that the Sun had reached its highest altitude when the full width of your mitted hand could fill the gap between the Sun and the horizon. ...

To main of Laboratory . The research work and design of optical and optical-electronic devices are carries out by laboratory staff: . ... Lens: . ... In the layout 1 prism systems perform functions of dispersive element, corrector of aberrations, optical reducer. ... Spectral range 200 - 400 nm; . ... Back Forward . ... The main corrector's function are compensation of field aberrations of the main spherical mirror of a telescope (diameter of 600 mm, f'=1200 mm) and increase aperture ratio. ...

... Take a particularly simple signal: a cosine wave. ... Now, we are going to stretch and shrink the wavelet along the time axis (we assume the data is in the time domain), and at each time compare the shape of the signal to that of the wavelet. ... Figure 3: The wavelet (dotted line) is translated rela tive to the signal (solid line). ... Figure 4: The dashed line plots the `match' between the wavelets (dotted line) and the signal (solid line) as a function of time. ...

... There are preliminary series of photometric and radio spectral observations of the above-mentioned stars, archival data on the light curves of the stars, results of the search for OH and H 2 O maser emission in IRAS point sources that possess the IR parameters similar to Miras. ... The aim is a detailed study of the maser emission variability. ... In 1996-1997, astronomical observations of Mira Ceti-type stars (miras) were carried out in three spectral ranges: optical, infrared, and radio. ...

... kupry@sai.msu.ru also kupry@asu.cas.cz . ... Solar expeditions. Astronomical Institute Czech Republic Examples IDL procedures Evpatoria Space Image Evpatoria Winter 2012 European Solar Physics Meeting Digital Images Album IDL Lib Karlovy Vary, 2008 List of publications Masha MAX MILLENNIUM PROGRAM My family (new) HSFA-2, 2005 Ondrejov (brezen 2005 ) Ondrejov webcam Photo Ondrejov observatory Praha SatTV Seznam SOHO Solar eclipse 31 July 1981 Software IDL programmes ...

... Contact A Problem of an estimation of accuracy of the asteroid CCD observations . The Minor Planet Center supported by the Interntional Astronomical Union is the main office for keeping observational data of the small Solar System bodies and their investigations. ... At Pulkovo Observatory we are estimating an accuracy of the CCD asteroid observations obtained by amateurs and professional astronomers all over the World using the MPC database. ...

Cryogenic Phase Locking Loop System for Superconducting Integrated Receiver Andrey Khudchenko1, Valery Koshelets1, Pavel Dmitriev1, Andrey Ermakov Pavel Yagoubov2, ... Institute for Space Research, the Netherlands Research Center of Superconducting Electronics Iceberg , Ukraine 1, Abstract A bandwidth of the typical Phase Locking Loop ( PLL ) system for the Superconducting Integrated Receiver ( To overcome this limitation we propose Cryogenic Phase Locking Loop (CPLL). ...

... Division , Virginia Polytechnic Institute, Blacksburg, VA, 1954-1955; College of William and Mary, Williamsburg, VA, 19591961 PRE- NASA EXPERIENCE: National Advisory Committee for Aeronautics, Langley Aeronautical Laboratory, Langley Field, VA (1954-1958) · Aerospace Technologist, Fluid and Flight Mechanics Branch (1954-1958) NASA Langley Research Center , Hampton, VA (1958-1961) · Aerospace Technologist, Fluid and Flight Mechanics Branch (1958-1961) · Transferred to ...

Peremennye Zvezdy", . ... USNO-B1.0 0610-0600707 . ... USNO-B1.0 0608-0607099, 2MASS J17455451-2908127 . ... The star is too faint to be detected in the W2 band. It is difficult to unambiguously match the star with a 2MASS catalog object. ... The variable is the brighter southern star. It was not possible to measure the stars separately using UVOT U and W1 images, so the light curves and the variability amplitudes in these two bands refer to the combination of two stars. ...

... 13, Moscow 119992, Russian Federation, e-mail: busarev@sai.msu.ru; 2 Research Institute Crimean Astrophysical Observatory, p/o Nauchnyi, Crimea 334413, Ukraine, e-mail: prok@crao.crimea.ua Summary: We propose a combined method of astronomical investigations of small or distant planets incorporating registration of a set of integral spectra of an object and their frequency analysis. ... An application of the method is shown on example of asteroid 21 Lutetia. ... 6] Busarev V. V. (2002), Solar Sys. ...

Planetary Radio Interferometry and Doppler Experiment (PRIDE) for a Europa -Jupiter mission Leonid Gurvits, Sergei Pogrebenko, Peter Fridman, Giuseppe Cimo JIVE, Dwingeloo, The Netherlands Europa Lander : Science Goals and Experiments IKI , Moscow , Russia, 10-13 February 2009 Generic PRIDE configuration Background radio sources Earth VLBI Network and Two-way tracking stations Orbiter Planet-target Micro ... 2008, SKA Memo No. ... How many targets PRIDE-JE deal with: orbiter, lander(s)? ...

... the radiative transfer equation (RTE) for the randomly-irregular magnetized plasma has been derived on the base of general grounds of the multiple scattering theory . ... Solutions of several absolute tasks of the scattering theory have been obtained (on the optical depth of the ionospheric plasma layer, on the value of radio wave anomalous attenuation, on anomalous refraction, on the backscattered signal intensity for the source being placed within a plasma layer). ...

This plot shows the projected motion of the red dwarf star Proxima Centauri (green line) over the next decade, as plotted from Hubble Space Telescope observations. ... Because Proxima Centauri is the closest star to our Sun, its angular motion across the sky is relatively fast compared to much more distant background stars. This means that in 2014 and 2016 Proxima Centauri will pass in front of two background stars that are along its path. ...