... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... The Magazine . ... Observing . ... Back Issues . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Heading back to Jupiter's moons . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter...

... 2009 December 29 . Rigel and the Witch Head Nebula . ... More formally known as IC 2118 , the Witch Head Nebula glows primarily by light reflected from Rigel . ... Pictured above , the blue color of the Witch Head Nebula and of the dust surrounding Rigel is caused not only by Rigel 's blue color but because the dust grains reflect blue light more efficiently than red. ... Rigel, the Witch Head Nebula , and gas and dust that surrounds them lie about 800 light-years away. ... About APOD | ...

Next: EVOLUTION MODELS Up: EXTREME HELIUM STARS: PULSATION Previous: EXTREME HELIUM STARS . The characteristic surface properties, effective temperature , surface gravity and composition , of EHes have been summarized by Jeffery (1996). ... Helium: ( ) By definition, helium dominates the atmospheric abundances. ... This is supported by a correlation between N and Fe abundances in EHes. ... Next: EVOLUTION MODELS Up: EXTREME HELIUM STARS: PULSATION Previous: EXTREME HELIUM STARS Simon Jeffery . ...

... Internal rules for dormitories . ... Samara State Aerospace University Students life Internal rules for student dormitories of Samara State Aerospace University . ... Residents of the dormitory and the University Administration, according to the Charter of SSAU and the Provisions for students' dormitories at SSAU, must sign the Mutual Responsibilities Agreement. ... Residents are informed about the Regulations by the Head of the Dormitory, and confirm their awareness of the rules in writing. ...

... Dust in the region is studied photometrically at ultraviolet, optical, and far-infrared wavelengths to analyze nebular colors, grain properties, and scattering geometry. Constraints on this geometry are provided by spectroscopy of radio emission lines and optical absorption lines of the interstellar gas, which also reveal a significant amount of fine-scale filamentary structure. ... Return to Thesis Page ...

... Stellar Evolution . Nucleosynthesis in Stars . The Evolution of Star Clusters . JAVA Physics Lab . Alternative Energies Class . Steve Kevan's Physics 251 Class . ... Talk on Solid State Physics of CCD detectors . Talk on Cosmological Issues . ... Digital Spectra of Stars . NETexperts E-mail List . The Electronic Universe Project e-mail: nuts@moo.uoregon.edu ...

... Academics . Research Innovation . ... University Psychological Counseling . ... Center for International Education . ... Research Institutions . Research Institute of Astronomy . Research Institute of Biology . Research Institute of Chemistry . ... About the Department . ... The Research Institute of Chemistry (established in 1929) is the first research institute founded at Kharkiv University. ... Chemistry. ... Research Affairs Record Manager of the Research Institute of Chemistry . ...

... Natalya V. Raguzova and Sergei B. Popov . ... We present a compilative catalogue of Be/X-ray binaries and candidates in the Galaxy and in the Large and Small Magellanic Clouds. This catalogue contains 160 sources and provides information on names and spectral types of optical components, distances, on spin characteristics of neutron stars, and on orbital and X-ray properties of binary systems. ... Be/X-Ray Binaries and candidates in the Galaxy . Galactic sources: comments to the Table 1 . ...

... The Science Operation Department is composed of Astronomers, Telescope Instruments Operators(TIOs) and Data Handling Administrators(DHAs). ... Astronomers have proposed several methods to quantitatively measure the amount of turbulence above the telescope, which the most common ones is Differential Image Motion Monitor (DIMM). In optical testing, the Hartmann test is the common method to test the quality of optical components. ... Hartmann mask consists of 48 lenses. ...

... (matthias.busch@easysky.de) 2003-07-20 '--------------------------------------------------------------- Function ListProperties(ByVal image ) On Error Resume Next WScript.Echo 01 Airmass = image .Airmass WScript.Echo 02 Altitude = image .Altitude WScript.Echo 03 ApertureArea = image .ApertureArea WScript.Echo 04 ApertureDiameter = image .ApertureDiameter ...

... Media types relate to HTML as follows: . When a Web server sends an HTML document, it should specify the correct media type ( text/html ) in the HTTP headers it sends along with the document. ... You can check what is the media type information sent by a server as follows: Assuming we are interested in the media type of the document at URL http:// host / path , establish a Telnet connection to host using the port number in the URL if present, port 80 otherwise. ... HEAD / path HTTP/1.0 . ...

... It has been largely superceded by MatWeb . Conversion Factors . Material properties . Physical constants . Astronomical constants . This table gives conversion factors to convert various units to their SI equivalents. ... The units are SI. This is a short list of physical constants in SI units. ... Boltzmann constant . ... Gas constant . ... Mass . ... Plank's . ... Radiation constant . ... This is a short list of astronomical constants in SI units. ... Sun . ...

Next: stecf.impol - Package Tasks Up: stecf.impol - an IRAF Previous: stecf.impol - an IRAF . All the instrumental set-up, such as filters, polarizers, rotation angles, etc. are read from the image headers. Many input images ( 3 < N < 64) can be processed. ... Output images can be rebinned to increase the polarization signal-to-noise per output pixel. ... Output error images have fully propagated statistical errors from the input error images. ...

Professor in Astrophysics, Head of Group . ... Department address: . ... Battcock Centre for Experimental Astrophysics, . Cavendish Laboratory, . ... Cambridge CB3 0HE. Telephone: (+44) (0)1223 337477 . Fax: (+44) (0)1223 337563 . College address: . Jesus College, . ... Cambridge CB5 8BL. Telephone: (+44) (0)1223 339432 . ... Cavendish | Astrophysics Home ] . ...

JSC History . ... NASA History . ... White Sands Space Harbor . ... Historic American Engineering Record (HAER) Level II Documentation . From 1976 to 2011, NASA has operated and managed the White Sands Space Harbor (WSSH) for astronaut training operations and as an alternate landing facility for the Space Shuttle Program (SSP). ... White Sands Space Harbor HAER Level II documentation (complete - 20.6 MB) . White Sands Space Harbor HAER Level II documentation (individul sections) . ...

Wave propagation in an irregular plasma . Methods of the ionospheric plasma radio sounding . ... Program, Grant No. ... Investigation of Anomalous Attenuation Effect Caused by Radio Wave Scattering and Transformation on the Ionospheric Irregularities . ... Grant No. ... Diagnostics of Ionospheric Irregularity Spectrum Using Measurements of Radio Wave Anomalous Attenuation Under Vertical Sounding . ... Simple numerical model of radio wave multiple scattering effects in the ionospheric plasma layer. ...

... Lecture course (2015/2016) "Galactic Astronomy" (PPT, PPTX) (for 2nd grade students, in Russian) . ... Lecture course (2015/2016) "Astronomical Distances" (PPT) (for postgraduate students, in English) . Lecture course program "Galactic Astronomy" (DOC, for 2nd grade students, in Russian) . Lecture course program "The Elements of Stellar Dymamics" (for 4-5th grade students, in Russian) . Tutorials on astronomy (PDF, PS, DJVU, HTML) . ... My Reviews and Talks (In Russian) . ...

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Download Izmccd (~2.7 MB). ... a) a choice of the best mode of measurements of stars and objects ("Properties/Measurement"), . b) a choice of reference stars. ... 1) necessity of presence on an image of a plenty of stars (we recommend to apply this mode, if on the frame of reference stars is more 100) . ... Sx and Sy depend from residuals at all reference stars (reference stars are marked by blue color). ... These residuals are the image of the star a minus function of a profile for each pixel. ...

... Future seminars . P a s t seminars . ... E.G. Berezhko (Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy) . ... CR acceleration (generation) at the shocks, produced by supernova explosions, and the properties of nonthermal emission generated by CRs accelerated in supernova remnants are detaily discussed. ... Due to magnetic field amplification CR acceleration in supernova remnants provide the formation of the observed galactic CR spectrum up to the energy 10**17 eV. ...