The problem of eXtremely-Metal Deficient (XMD) galaxy ages. ... Problem of ages of XMD galaxies is addressed through the comparison of colours of stars in their outer regions (where one can neglect the effect of recent star-formation activity), with model tracks of evolving stellar populations from, e.g., the popular package PEGASE.2 (Fioc Rocca-Volmerange 1999). For some of XMD galaxies, the contribution of nebular emission in the light of outer regions is negligible or invisible. ...

XMM ­Newton CCF Release Note XMM ­ CCF ­REL­1 Effective area of the X­ray telescopes P. Gondoin October 4, 2000 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS flag XRT1 XAREAEF 0006 2000 ­01­13T00:00:00 ONAXISXAREAEF, VIGNETTING Cal 3.80, xmm ­ sas 20000903 1900 NO XRT2 XAREAEF 0007 2000 ­01­13T00:00:00 ONAXISXAREAEF, VIGNETTING Cal 3.80, ... 3 Scientific Impact of this Update This update has no impact on on­axis the effective area accuracy. ...

XmTel uses the XPA interface for extensible connection to the operating system and scripting. ... Support for several commercial telescopes and controllers under Linux .. ... Software Bisque Paramount ME (requires RTS2 library) . ... In the current version of XmTel .. ... Offers command line and scripted operation using XPA . ... Version 7 includes the XPA server, telescope drivers, a client, utility software, and a standalone option that does not use XPA. ... Previous versions and support for INDI . ...

Images of real SODART telescope SODART covered part of OB at Lavochkin (March 1998) . SODART Flight Optical Block at Lavochkin (30 Jan 1998) . Integration of Flight Optical Block at IABG clean facility (Dec 1997) . SODART slides integrated at Lavochkin (Dec 1997) . Optical block thermal vacuum tests at IKI (Sep 1997) . SODART vibrational tests (Feb 1997) . ... SODART Point Spread Function . Simulated SODART image of 5 X-ray sources: on-axis, 4, 8, 10, 15 arcmin off-axis. ...

... He made observations of a supernova (literally: nova= "new star") in 1572 (we now know that a supernova is an exploding star, not a new star). ... Brahe's meticulous observations showed that the supernova did not change positions with respect to the other stars (no parallax). ... This was early evidence against the immutable nature of the heavens, although Brahe did not interpret the absence of parallax for stars correctly, as we discuss below. Brahe made careful observations of a comet in 1577. ...

... FTP access the basic models is here . ... Below, we put short descriptions of the used SED models for the photometric redshifts providing by the current server . ... The uniqueness of this model consists in expanding to the near IR (NIR) of Rocca-Volmerange and Guiderdoni's (1988) atlas of synthetic spectra with a revised stellar library, which includes parameters of cool stars. ... Homepage of the GISSEL model). ... Another model used earlier is the model of synthetic spectra of Poggianti (1997). ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. ... You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model . ... 2008 Phil Plait. ...

Next: J.E. Chambers, Research Astronomer Up: Research Previous: W.M. Napier, Senior Research Contents . Dr John Butler has carried out activities in the following main areas: . ... Bag?, has started a project on the link between solar activity and cosmic rays on clouds and their possible influence on the Earth's mean temperature. ... The proceedings of the meeting were edited by C.J. Butler and J.G. Doyle and published by the Astronomical Society of the Pacific in their conference series. ...

Static Fourier spectrometers are often used for spectral measurements of the ionosphere emissions. There are two main advantages of Fourier spectrometers (FS) - large geometric factor and high spectral resolution; these parameters are two orders better than for grating spectral instruments. ... In scanning Fourier spectrometer optical and electric modulation of signal is used to avoid this problem, for static Fourier spectrometer there are no such ways. ...

Next: Initial binary parameters Up: Population synthesis of Previous: Introduction . Monte-Carlo method for statistical simulation of binary evolution was originally proposed by Kornilov & Lipunov (1983a,b) for massive binaries and developed later by Lipunov & Postnov (1987) for low-massive binaries. ... Recently Leitherer & Heckman (1995) have modelled star formation for elliptical and spiral galaxies, taking into consideration only the single stars. ... Initial binary parameters . ...

... 1993: . Based on the microwave observations of the Sun on the RATAN-600 and the Large Pulkovo Radio Telescope with high spatial and frequency resolution a new model of interaction of the photospheric and coronal magnetic fields in active regions was finalized. ... Archive . ...

... Telescope Tours . Use fun activities like Trip Around the Triangle, Telescopes as Time Machines, and Telescope Treasture Hunt to engage your visitors while looking through your telescope. What Power is your Telescope ? ... Why does the Moon have Phases ? Using a simple 3D model, allow participants to discover why the Moon has phases. ... Sharing the Universe is based upon work supported by the Informal Education Division of the National Science Foundation under Grant no DRL-0638873. ...

EPM-ERA2012 Lunar Ephemeris and selenodynamical parameters from LLR data(1970-2012) M.V. Vasilyev, E.I.Yagudina IAA RAS, St-Petersburg, Russia Reflector at the Moon The reflector 's positions at the Moon surface 3.5 m telescope at Apache station INTRODUCTION MODERN EPHEMERIDES: 1. ... IAA RAS, Russia-EPM-ERA2012 The present analysis of (17580) LLR observations, (time interval 1970, March - 2012, February) Model ( brief description). The dynamical model EPM-ERA has been developed by G.A. Krasinsky. ...

Castalia . Asteroid 4769 . Asteroid 4769 Castalia is a near-Earth crossing asteroid that was discovered by Eleanor F. Helin (Caltech) on August 9, 1989. Scientists used radio astronomy and computer modeling to generate this image of Castalia. They obtained the data for the computer model in 1989 using the Arecibo radar/radio telescope in Puerto Rico when the asteroid passed within 5.6 million kilometers (3.5 million miles) of the Earth. ... Topographic Map of Castalia . ...

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