RTT150 . ... This search system is designed for generating the necessary information on series of pointings (observations of each source consist of sets of exposures with different filters and sometimes with different exposure times) for observed sources. Search results appear at the separate page as a table with the following data: . DATE - real (not evening!) observations date (in YYYY-MM-DD format); . ... Bin - minimal CCD binning mode (may vary during the observations); . ...

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. home . product . gallery . contact .

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... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. April 23, 1998 . Three Dusty Stars . ... Explanation: These separate radio images reveal three dusty debris disks surrounding three bright, young, nearby stars - evidence for solar systems in formation. ... The false color maps show the intensity of submillimeter radio emission from the surrounding dust. ... About APOD > . ...

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• APOD: 2005 November 2 - Epimetheus and Janus: Interchangeable Moons of Saturn
• Vector Operations
• APOD: 2003 December 10 - Cassini Approaches Saturn

... Let us first find out which way -- rise in spectral resolution with some loss in the S/N ratio or increase in the S/N ratio with a fixed spectral resolution -- is better for the purpose of reduction of equivalent width determination errors. ... N -- number of counts for 1 ? ... line equivalent width, . ... Thus if the spectral resolution is managed to be increased (i.e. to decrease )without loss in the number of counts falling at 1 ?, the equivalent width measurement error is then proportional to . ...

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• Work Scan Program + Data Viewer (IDL widget)
• New spectra of R CrB
• Laboratory for the Stellar Magnetism Study of SAO of the RAS - Home

... The Palomar Testbed Interferometer (PTI) is a 110-meter baseline K-Band infrared interferometer located at Palomar Mountain, California. In 1999 an effort was started to provide more observer-friendly observation planning and monitoring tools, such as might be used in NASA interferometer missions. This session illustrates how these prototype tools aid in the observation of spectroscopic binary stars. ... In 1999 an effort was undertaken to prototype mission operations support tools at PTI. ...

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• Spatial Structure of NGC 6822: An Example for Statistical Modeling of
• Modern CCD Observations of Moving Celestial Objects: Algorithms and Software
• Identification and Analysis of Binary Star Systems using Probability Theory

Computer Ephemeris for 2015 from DE200/LE200. Longitude of central meridian of Uranus. ...

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• Central meridian positions for physical observations of Saturn for Computer
• Central meridian positions for physical observations of Neptune for Computer
• Explanations to ephemeris for physical observation of the planets for Computer

Next: Star Formation Rate and Up: No Title Previous: Calculation of Evolutionary Tracks . To start calculations, we choose the distributions of the initial binary parameters: the mass of the primary ZAMS component, , binary mass ratio, , orbital separation a . ... whereas the mass ratio distribution is not. ... The zero assumption often made is that the mass ratio distribution has a flat shape, that is binaries with a high mass ratio occur as frequently as those with equal masses. ...

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• The COOC Criterion (Criterion of Observations versus Calculations)
• Seminars
• Effect of sources evolution on

... Laboratory and theoretical modelling of the UV bump on the interstellar extinction curve is a very popular topic in dusty investigations. ... feature is illustrated by Fig. 10 where the profiles were calculated using the model of graphite spheres. Figure 10: Normalized extinction efficiencies for graphite spheres. ... The lower panel shows the summary extinction of two graphite spheres with radii and (from upper panel) taken in equal proportions. ...

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• Database of Optical Constants -- Level: welcome
• Database of Optical Properties -- Level: subsubpage
• Extinction properties (transmitted radiation)

... The experience of determination of the link between radio sources and dynamical reference frames is presented. To obtain this connection we used a series of very long baseline interferometry (VLBI) observations of the spacecraft Phobos-2 and angularly nearby quasars. ... The dynamical reference frame is determined by equator and equinox of these ephemerides. ... References . ... The relative orientation of the radio and dynamical reference frames can be described by a sequence of three rotations . ...

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• Abstract
• 1803+78: A Helical Core Jet
• Data Format Session at 2001 IAU WG Meeting

... Exposure Time Calculator (ETC) . ... ESO - Public Surveys . ... the recommended values to use for DIT, . ... Detector on-chip integration (DIT): seconds. to your chosen value - a separate page gives recommended values to use for DIT - for modes 1 and 2 below you may wish to start with the maximum recommended values as these will minimize the effect of read noise (a total object exposure of Y secs with DIT=X secs will produce Y/X lots of read noise) and give you a lower limit on the time needed. ...

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• VISTA - Visible and Infrared Survey Telescope for Astronomy

... An anelemma is that figure-8 curve that you get when you mark the position of the Sun at the same time each day throughout planet Earth's year. ... Today or tomorrow, depending on your time zone, the Sun reaches its northernmost point in planet Earth's sky marking a season change and the first solstice of the year 2004. ... Ida and Dactyl: Asteroid and Moon . ... This asteroid has a moon! ... Elliptical Galaxy M87 . ... Even for an elliptical galaxy, though, M87 is peculiar. ... Next [ Last page ] ....

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Prognoz-7 satellites magnetometer observation database . The Prognoz-7 satellite was launched 30 October 1978 into orbit with perigee 500 and apogee 203000 km, orbital period was 98 hours. Magnetic field measurements were conducted by SG-70 magnetometer with working range +/- 60 nT., accuracy about 0.3 nT. and sampling rate 1 measurement per 10.24 sec. Magnetic measurements and satellite position data in GSE coordinate system are presented in separate ASCII files. ...

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• [INTERBALL] pr-7

Marc White . ... Research . ... The outflows driven by forming protostars provide important clues to the nature of the star formation process. My research focuses on observations and analysis of the outflows driven by actively-accreting protostars. ... How are the outflows being driven? ... Built by my home institution, The Research School of Astronomy and Astrophysics of The Australian National University, NIFS is a fantastic instrument for doing protostellar outflow work. ...

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• COALA - Cherie Fishlock
• Student Briefing

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . Sun . ... Stars . ... Monthly Sky Notes . ... Among the wonders of the sky they shared may have been something we do not have today, a neighbouring star roaming through the outer edge of the Solar System. ... Today Scholzт??s Star is about 20 light years from the Sun in the constellation of Monoceros. ... Seen from our Solar System, Scholzт??s Star barely moves across the across the sky. ... Astronotes . ... Subscribe to Astronotes . ...

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... The CAPTION element is used to label a table or figure. Use the align attribute to specify the position of the caption relative to the table/figure. ... CLASS . ... The CLASS attribute is most commonly used to attach a different style to some element, but it is recommended that where practical class names should be picked on the basis of the element's semantics, as this will permit other uses, such as restricting search through documents by matching on element class names. ... ALIGN . ...

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• Divisions
• About RadioAstronomy Dept. of SAI

... 248, 2007 W. J. Jin, I. Platais & M. A. C. Perryman, eds. c 2008 Intern atio nal A stro nom ical U nion doi:10.1017/S1743921308018838 A compiled catalogue of reference stars around the selected ERS in the northern sky V. P. Ryl'kov1 , N. Narizhna ja1 , A. Dement'eva1 , N. Maigurova2 , G. I. Pinigin2 and Y. I. Protsyuk2 1 Main Astronomical Observatory of RuAS, MAO RuAS, Russia email: vryl@gao.spb.ru; 2 Nikolaev Astronomical Observatory, NAO, Ukraine email: pinigin@mao.nikolaev.ua Abstract. ... Pul...

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• Pulkovo Database of Observations of Visual Double Stars

... Pulsars offer a variety of observables for study of interstellar scattering. Observations of scattering of nearby pulsars and intra-day variable quasars point to the existence of a component of the interstellar medium (ISM) which has properties quite different from the more distant, diffuse ISM. ... The time series of electric field emitted by the pulsar is convolved with an impulse-response function due to scattering, when sampled at the observer plane [1]. ... Nearby interstellar scattering. ...

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• Texas Survey of radio sources at 365MHz
• Description of the RadioAstron project, english version
• GOCG Pre-Observation Products

Stellarium 0.12.3 . ... Classes . ... FileљStructure . ... StelQGLArrayVertexBufferBackend Class Reference . Base class for QGL-using vertex buffer backends based on separate attribute arrays. ... virtual voidљ . addVertex (const void *const vertexInPtr) . Add a new vertex to the buffer. ... voidљ . ... Specifications of vertex attributes that will be stored in the buffer. virtual void StelQGLArrayVertexBufferBackend::addVertex . ... virtual void StelQGLArrayVertexBufferBackend::clear . ...

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• Stellarium: StelQGLInterleavedArrayVertexBufferBackend Class Reference
• Stellarium: Position Struct Reference
• Stellarium: File and Directory Structure

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• Potential Energy
• ESO Press Release 06/96, 16 February 1996
• The Galaxy Gallery: Messier Objects

Cosmic ray intensities (left) compared with predictions (right) from IBEX. The similarity between these observations and predictions as evidenced by the similar color regions supports the local galactic magnetic field direction determined from IBEX observations made from particles at vastly lower energies than the cosmic ray observations shown here. The blue area represents regions of lower fluxes of cosmic rays. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B6A0CFC54-E980-48A0-95C9-07BE42AAFE07%7D
• Hawaii astronomers keep tabs on asteroid Apophis | Astronomy.com
• A galactic crash investigation | Astronomy.com