... Armagh Observatory, 24th March 2009: The International Space Station ( ISS ) has recently become the second brightest object in the night sky тАФ even brighter than the planet Venus, and second only to the Moon. Evenings will provide the chance of a spectacular view, if the sky is clear, as for the next few days the orbit of the ISS around the Earth repeatedly takes it over Ireland. ... At its best, it is now the second brightest object in the night sky. ...

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. ...

... Credit: Giovanni Benintende Explanation: Big and beautiful spiral galaxy M81 lies in the northern constellation Ursa Major . ... This superbly detailed view reveals its bright yellow nucleus, blue spiral arms, and sweeping cosmic dust lanes with a scale comparable to the Milky Way . ... Scrutiny of variable stars in M81 (aka NGC 3031) has yielded one of the best determined distances for an external galaxy -- 11.8 million light-years. ... Publications with keywords: M81 - spiral galaxy . ...

... The time taken to read through a quadrant on the array sets a fundamental limit on the fastest electron collection rate which can be achieved by resetting all the pixels. An inherent consequence of the methods of operating the NICMOS array detectors in the ACCUM, MULTIACCUM, and RAMP modes is therefore that there is a minimum possible exposure time, ~ 0.6 seconds (0.302 for MULTIACCUM), set by the time required to read the array. ... Figure 15.1 illustrates the operation of bright object mode. ...

... 2006 July 7 . Bright Galaxy M81 . ... Explanation: Big and beautiful spiral galaxy M81 lies in the northern constellation Ursa Major . One of the brightest galaxies in planet Earth's sky, M81 is also home to the second brightest supernova seen in modern times. This superbly detailed view reveals M81's bright yellow nucleus, blue spiral arms, and sweeping cosmic dust lanes with a scale comparable to the Milky Way . ... About APOD | ... NASA Web Site Statements, Warnings, and Disclaimers . ...

... TOA strongly distorted by calibration errors Second ATNF Gravitational Wave Workshop 13 December 2007 Second ATNF Gravitational Wave Workshop 13 December 2007 Second ATNF Gravitational Wave Workshop 13 December 2007 Second ATNF Gravitational Wave Workshop 13 December 2007 Second ATNF ...

AUTOMATED CREATION OF THE LUNAR HYPSOMETRIC MAP: TECHNIQUES OF COMPILING. ... And the second one is the database, obtained from the raster images of the Lunar Subpolar regions (higher than latitude ±60°) where brightness of each pixel depends on its height [1]. ... Due to these reasons it was necessary to develop the special 10-stage methodology of data processing and map compiling. ... The height data were obtained and the lunar hypsometric map was created according to the 10-stage methodology. ...

... The MIT-Green Bank (MG) 5 GHz survey covers 1.87 sr of sky in the declination range between -0.508 and 19.496 degrees, and galactic latitude, b, above |b| > 10 degrees. The MG catalog contains 5974 sources with a signal-to-noise ratio greater than 5. ... The final MG II catalog contains 6182 sources detected with a signal-to-noise ratio greater than 5. The catalog was produced from two separate north and south surveys with the National Radio Astronomy Observatory (NRAO) 91m transit telescope. ...

... Guider functions . ... Guide Sensor Performance . ... Guide Sensor Sky Coverage/ Star Availability . Guide Star Selection Criteria . ... Guide fiber organization and reach at plug plate . ... Plug plate holes for guide stars are identical to those for science FO . ... FOV for each of 9 guide stars is 7.4 arcsec dia. (0.45 mm FO, Sumitomo IGN-05/10) . ... Selected guide stars must have no neighbor stars within TBD (5 arcsec) radius that have a brightness within TBD (5 mag.) of guide stars . ...

Solar corona data format (up to June 1957) 1-4 Year 6-7 Month 9-13 Day (with fractional part) Data in line 5303 Angstroem : 15-17 Latitude of the radiation center ( 999 =no data ) 18 Limb (E= east , W=west) 20-21 Basis of the luminous zone, in degrees (99=no data ) 23 Brightness in 6-grade scale, or 0 ( brightness is below threshold), or 9 (no data ) Data in line 6374 Angstroem : 25-27 ...

... Science . ... Science Users Information > Science Publications > Science Announcements > Final Data Release of zCOSMOS-bright Redshift Survey . ... Observing Facilities . ... Observing with ESO Telescopes . ... ESO HST Image Galleries . ... This final release of zCOSMOS-bright includes 20689 1-d spectra. The survey was split into two parts: the first, zCOSMOS-bright, which is the subject of this release, aimed to produce a redshift survey of about 20000 I -band selected galaxies at redshift z<1.2. ...

... Kepler's Laws . ... Second Law . 12a. More on 2nd Law . ... Kepler's 2nd law prescribes the way the velocity V of an object orbiting a single center varies around its orbit: . The rate at which the line to the center ("radius vector") covers area does not change around the orbit." As noted in section #12 , this means that the object's velocity V increases when its distance r decreases, and vice versa. ... Because by Kepler's 2nd law, the Earth moves in its orbit a little faster in winter. ...

... the average spectra was computed for each band. the rms/mean by channel was computed for each band. ... The rfi mask was used to compute the total power for each band. ... interim correlator 9 level sampling, 1 second spectra, 25 Mhz bw, 1024, centered at 1385. take data for 4200 seconds. rms/mean computed over the 4200 seconds and then a mask was created using a linear fit to rms/mean. total power was computed using the above mask. the spectrum of the total power was also computed. ...

... The TRACE images may be used without restrictions in publications of any kind. ... These two images, taken on 18 November 2000 at 15:54UT and 16:11UT, respectively, show such an event: the red circle in the image to the left shows a region where many loops are cooling, with bright loop tops (the intensity scales with the square root of the image to reduce the dynamic range). ... See also a collection of images related to the Sun, other cool stars, and solar-terrestrial effects . ... Images | ...

... By admin September 24, 2010 Posted in: Planets . ... Although it is hard to imagine technology that could enable people to survive on Venus that has not stopped a few science fiction tales from describing humans visiting or settling on the surface of Venus; the TV series Space Odyssey (2004) and Defying Gravity (2009) had near future astronauts in armoured spacesuits making brief EVAs on the planet. ... I googled ?on venus, what would kill you first?? and this page was the number one result. ...

Definitions of Magnitudes and Surface Brightness 1 The magnitude system 1.1 Apparent magnitude Astronomers are stuck with the antiquated old system of magnitudes and so a clear explanation of what this system is and how it relates to more sensible units is important. ... 1.2 Absolute magnitude Absolute magnitude is a logarithmic luminosity scale. ... One usually goes by the round about process of referring to the absolute magnitude of the sun. ... Magnitudes and surface brightness 6/6 ...

Bright Supernova - Archives On these pages you will find references to Supernovae which have faded into oblivion. ... Finally, in 1999, when I took over the International Supernova Network's Latest Supernovae page I retitled the main page "Latest Supernovae", BUT, it's the "Latest Supernovae" page of the "Bright Supernovae" pages which are also sub-pages of ISN. ... Brightest supernova in 2005 . ... Brightest supernova in 2002 . ... Brightest supernova in 2000 . ... Brightest supernova in 1999 . ...

An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . THE ANCIENT UNIVERSE . c) The Age of Light from the Most Distant Galaxies: The "Time Machine" Effect . ... Thus we are actually seeing these galaxies not as they are today, but as they were billions of years ago. ... The Universe: An Overview | ... The Ancient Universe - The Age of the Expanding Universe - The Age of the Oldest Stars - The Age of Light From Distant Galaxies - The Age of the Chemical Elements | ...

... Impact craters and associated concentric rings are about the only features to be found on Callisto. ... It has a bright central region that is 600 kilometers in diameter, and its rings extend to 3000 kilometers in diameter. ... This image shows the heavily cratered surface of Callisto. ... Also visible is a fresh, sharp-rimmed crater some 90 km (56 miles) across named Igaluk (center left third of picture), and a bright zone in the south polar area (bottom of image) which could be an impact scar. ...

... Tonight's Sky . ... The Magazine . ... Observing . ... 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 . ... Bright planets meet at dusk . ... Astronomy magazine subscribers can read the full article for free. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter....