Point Spread Function . The OTA spherical aberration produces a Point Spread Function (PSF--the apparent surface brightness profile of a point source), as presented to the instruments, with broad wings. ... It shows the aberrated HST PSF, the WFPC2 PSF, and for comparison the PSF that would be obtained from a long integration if HST were installed at a ground based observatory with one arcsecond seeing. ... The WF/PC-1 core was approximately 50% broader than the core that is obtained with WFPC2). ...

The parameter brief (with its actual uncertainty sbrief) is the mean effective surface brightness in B-band , i.e. the mean surface brightness inside the effective aperture (the circular aperture enclosing one-half the total flux). It is expressed in mag arcsec -2 . ... 2) from the mean surface brightness "LV" inside the effective isophote (elliptical isophote enclosing one half the total flux) measured by Launberts&Valentijn (1989) . ... Effective radius . ... HyperLeda . ...

Understanding Europa's Radiation Environment and How it Influences Landing Site Characterization G.W. Patterson, L.M. Prockter, C. Paranicas Applied Physics Laboratory Introduction · The surface of Europa is weathered by charged and neutral particles, micrometeroids, and photons. ... Background · Criteria for characterizing potential landing sites [e.g., Figueredo et al., ... 2004) Background · Criteria for characterizing potential landing sites [e.g., Figueredo et al., ... Figueredo et al., ...

Журнал ПОВЕРХНОСТЬ публикует оригинальные статьи и обзоры по наиболее актуальным проблемам изучения поверхностных явлений. ... Редакция журнала 'Поверхность. ... Англоязычная версия журнала Journal of Surface Investigation . X-Ray, Synchrotron and Neutron Techniques выходит 6 раз в год . The Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques ( Poverkhnost '. ... X-ray, Synchrotron and Neutron Techniques is abstracted and/or indexed in (Impact Factor 0.359): . ...

XMMнNewton CCF Release Note XMMнCCFнRELн12 RGS Effective Area C. Erd October 4, 2000 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS flag RGS1 QUANTUMEF 0006 1998н01н01T00:00:00 CCD DESC, SI1, SI2, SI3, SI4, SI5, SI6, SI7, SI8, SI9, RGA EFF, RGA INTERCEPT, RGA OBSCURATE --- NO RGS2 QUANTUMEF 0006 1998н01н01T00:00:00 CCD DESC, SI1, SI2, SI3, SI4, SI5, SI6, SI7, SI8, SI9, RGA EFF, RGA INTERCEPT, ... RGS-COL-CAL-00006 Page: 4 Auth.: ... 2] Jean Cottam. ...

... Baily s Beads near Solar Eclipse Totality . ... As the Moon moves to completely cover the Sun in a total solar eclipse, beads of bright sunlight stream around the edge of the Moon. ... Recorded on August 12 during the Perseid Meteor Shower, the wide-angle view takes in a large swath along the photographer's eastern horizon. ... This bright and colorful meteor flashed through Tuesday's early morning skies, part of the annual Perseid Meteor Shower. ... Black Hole Candidate Cygnus X 1 . ... August . ...

In this gallery are many images of Low Surface Brightness Galaxies which have recently been discovered and analyzed. ... The central surface brightness of this galaxy is 24.28 . Malin 2 This galaxy is another huge disk galaxy with a scale length of 15 kpc and a redshift of 15000 km/a. The high surface brightness knot in one of its spiral arms actually has the same color, luminosity and H-alpha equivalent width as the entire Large Magellanic Cloud . ... Truly it is a Low Surface Brightness Galaxy. ...

... Planets . ... The planets were found using the HARPS instrument on the 3.6m telescope at ESOтАЩs La Silla Observatory. ... A planet in orbit around a star causes the star to regularly move towards and away from observers on Earth. ... One newly discovered planet, HD 85512 b, is best hope found so far for a habitable exoplanet. ... The HARPS team so far have found that about 40% of stars similar to own Sun have at least one planet smaller than Saturn (which is 95 times more massive than Earth). ...

... Image courtesy of Korea Astronomy and Space Science Institute . ... There are already 29 multi-planet extrasolar planetary systems discovered (including this last one), so what makes this particular system unique? ... International Year of Astronomy, Ireland National Node . ...

... BOT OF M2 CONE TOP OF M3 CONE M3 INT. BAF1 M3 INT. BAF2 M3 INT. BAF3 M3 INT. BAF4 M3 INT. BAF5 : Angle in degrees Y-Value Weight 0.000000 0.500000 0.050000 1.000000 0.075000 2.000000 0.090000 0.500000 0.099500 0.500000 VCX 0.000000 0.000000 0.000000 0.000000 0.000000 VCY 0.000000 0.000000 0.000000 0.000000 0.000000 VAN 0.000000 0.000000 0.000000 0.000000 ...

... News Research . ... Expert in the characterisation of magnetic activity and the coronae of slowly rotating (solar-type) and planet-hosting stars. ... Characterising the spectra of M dwarfs in the optical and NIR and studying the effects of strong magnetic fields. ... Experienced in modelling the coronae of planet-hosting cool stars and currently mapping magnetic fields in young pre-main sequence stars using HARPS spectropolarimetric data. ... Space Girls Space Women - Gaitee . Science Fuse . ...

... We are developing the following problems: a) combine optical and microwave technic to the indication of non-linear surface waves and wave breaking field; b) modelling of microwave propagation in a multiphase air-water interface; c) obtain quantitative dependencies of microwave radiation on geometry and statistics of wave breaking field in ocean surface; d) monitoring of ocean surface states using optical amd microwave airspace data sets. ... Important issue is spray and underwater bubbles. ...

The efficiency of interaction of radiation with a particle and hence its optical properties depend on the particle chemical composition, size, shape, structure, etc. ... Particle size expressed in units of the wavelength of incident radiation, together with chemical composition, most strongly affects the optical properties of a scatterer. ... There are many methods to solve the light-scattering problem for a homogeneous spheroid (our survey of the light-scattering methods see here ). ...

... We present a computer program for modelling energy flux distribution and light curves of eclipsing binaries from far ultraviolet to infrared regions. The Roche model is assumed. Proximity effects of components (reflection of radiation and surface gravity darkening) are taken into account. ... Figure 1: The surface temperature distribution for Algol A-B system before (upper plot) and after (lower plot) correction for temperature due to the irradiation effect. ...

The night after the John Glenn program, I pitched the terraforming idea to my students. I asked them if they'd like to terraform Mars as a big class project; I wanted to throw the idea to them and see how they would react. Already I had a vision of splitting the class into several groups and having each group take charge of a portion of the project. ... Following my initial idea on how to conduct the project, I split the class into six groups, each student choosing his or her group. ...

Consequences of Impacts of Cosmic Objects in Circumstances of Changing Climate . ... The consequences of the impacts of asteroids about 1 km in size on the Earth are considered from the viewpoint of their negative effects under conditions when the climate changes. These effects are ejection of greenhouse gases, fires, changes in surface albedo, and global dispersion of asteroid material. ...

THE PARAMETERS INVOLVED IN HAPKE'S MODEL FOR ESTIMATION OF THE COMPOSITION OF THE EJECTA LUNAR TERRAINS. ... In the previous papers we were estimated the surface roughness of the ejecta lunar terrains by means comparison of the local phase function and the average integrated lunar indicatrix. ... The Hapke's theoretical model of the lunar surface reflection. ... For THE PARAMETERS INVOLVED IN HAPKE'S MODEL: S.G. Pugacheva, V.V. Shevchenko a low-albedo lunar surface parameter Bo = 1. ...

... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Right now as I write this, the planet Venus shines brightly in the evening sky, getting higher with each passing day. ... Actually, when astronomers were first able to start measuring properties of Venus, it did look very much like a twin of Earth. ... 2008 Phil Plait. ... Subscribe to the Bad Astronomy Newsletter! Talk about Bad Astronomy on the BA Bulletin Board! ...

... David R. Scott (Colonel, USAF, Ret.) NASA Astronaut (former) . ... He has graduated from the Air Force Experimental Test Pilots School and Aerospace Research Pilots School. ... Scott served as command module pilot for Apollo 9, March 3-13, 1969. ... The ten-day flight provided vital information previously not available on the operational performance, stability, and reliability of lunar module propulsion and life support systems. ...

... Telescopes ћ Binoculars ћ Microscopes . Meade Ultra-High Transmission coatings (UHTC ) Group . ... Meade Standard Coatings: The optical surfaces of all Meade telescopes include high-grade optical coatings fully consistent in quality with the precision of the optical surfaces themselves. ... These specialized, and extremely advantageous, coatings are offered here as the Meade Ultra-High Transmission Coatings (UHTC) group, a coatings group available optionally on many Meade telescope models. ...