Optical Filters . The polarizer quads were also designed to map onto a four-faceted WFC configuration and, consequently, also require a partial filter rotation of -33 degrees to move the filter quadrant 1 (nominal polarization angle 135 degrees ) into WFCs 2 and 3, with some vignetting of both camera fields. Several additional partial rotations have been added to allow observations with different polarization angles on the same CCD. ...

... Data Reduction FAQ > A number of OmegaCAM filters show vignetting in their central regions. What are the causes for this and what are the dimensions of these features? ... Observing with ESO Telescopes . ... ESO-MIDAS . ... ESO Data . ... ESO HST Image Galleries . ... ESO Data Access Policy . ... ESO Science Newsletter . ... A number of OmegaCAM filters are not monolithic, but consist of four segments (each covering 8 detectors) that have a central cross-shaped support structure. ... Filter . ...

... Feeding the Monster: Gas Caught in its Death Spiral into a Massive Black Hole . ... Stromlo Professor Mike Dopita have used the Hubble Space Telescope to discover how a massive Black Hole in a nearby galaxy feeds itself. ... Earlier Hubble Telescope data obtained by another team member, Professor Holland Ford of Johns Hopkins University in Baltimore, Maryland, had found a disk of gas rushing around the Black Hole at a speed of 500 kilometers a second. ...

... Young super-Jupiter found wandering without a parent . ... Astronomy for Kids . ... Tune into the Asteroid Day press conference . ... Astronomy 101 . ... How can six Trojan asteroids reside in Neptune's L4 region without colliding? ... The gravity of a planet, its star, and the centrifugal force associated with the planetary orbit nearly balance in five regions near the planetт??s path where an asteroid (or spacecraft) could orbit safely. ... Get instant access to subscriber content on Astronomy.com...

... High spectral, spatial and temporal resolution UV observations of the quiet Sun transition region show a highly structured and dynamical environment where transient supersonic flows are commonly observed. ... Estimates of the kinetic and enthalpy fluxes associated with these events show that explosive events are not important so far as solar coronal heating is concerned. ... In some cases, non-Gaussian line profiles are associated with supersonic flows in small magnetic loops. ...

NB: column filters work on tables only. ... Please show how to use column and regions filters . Filter events through a circular region using physical pixels fundisp foo.fits'[circle(512,512,.5)]' X Y PHA PI TIME DX DY ---- ---- --- --- --------------------- ---- ---- 512 512 6 7 79493997.45854475 578 574 512 512 8 9 79494575.58943175 579 573 512 512 5 6 79493631.03866175 578 575 512 512 5 5 79493290.86521725 578 575 512 512 8 9 79493432.00990875 579 573 . ...

... 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 | ...

... Australia Telescope Compact Array Radio Imaging of the Proplyd-like Objects in the Giant HII Region NGC 3603'' . M?cke, A., Koribalski, B.S. , Moffat, A.F.J., Corcoran, M.F., Stevens, I.R. 2002, ApJ 571, 366 . ... Brenneman, L., Corcoran, M.F., Moffat, A.F.J., Marchenko, S.V., Ptak, A., Skalkowski, G., Mushotzky, R., Stevens, I.R., Mueke, A., Koribalski, B.S. , et al. ... Physical Properties of visual counterparts to X-ray sources in the giant HII region NGC 3603'' . ...

Example 2: Figure 8 (90 Kbytes) shows an image of M31. While this is not a particularly spectacular image of M31 it is nevertheless unique as it was taken in a suburban backyard using a Lynxx CCD camera. The exposure is unfiltered. ... The image scale in this system is 41 arcseconds per pixel which yields a total field size of 2.2 x 1.9 square degrees. At this pixel resolution M32 blends into the light of M31, although NGC 205 (marked with a red arrow) is plainly visible. ... Page 6 . ...

18oct05 When 100 Mhz 3 level data centered at 1384 Mhz is taken (a2010), radar birdies appear in the band. ... The birdie at 1350 Mhz is the Faa radar. ... The table below shows where the 1350 Mhz birdies sits in the 1st IF and at baseband. It also includes the location of the baseband 2nd and 3rd harmonics of the 1350 Mhz birdie. ... When the center frequency is 1380 Mhz, both the 2nd and 3rd harmonics at baseband alias down to 1390 Mhz. ... The 1380 radar birdie comes from the 1350 Mhz birdie. ...

... rgsregions defines and constructs the various RGS event-selection regions, and adds them to the source list (see rgssources ). ... Image regions and the background region refer to the plane of dispersion versus cross-dispersion ( image plane ) and select events based on their spatial coordinates. ... The order regions refer to the plane of dispersion versus calibrated pulse-height ( energy plane ) and select events from a specific astrophysical source within a particular reflection order. ...

Next: Summary Up: The Second EGRET Catalog Previous: Upper Limits for . In regions of the sky where two or more sources have overlapping point spread functions, it is often difficult to resolve the number of sources and their locations. ... As an example, Nolan et al.(1995) list a source 0445+62 at l = 146.89 , b = 10.65 , with a = 4.0 and a source 0500+59 at l = 150.52 , b = 10.25 , with a = 4.2. ... Both of these sources lie close to the threshold adopted for this catalog. ... 1995). ...

... ONLY include the controls you are actually using. ... only used if > -100 !Profile_xmax = 1.2 !-101 ! ... only used if > -100 Profile_other_ymax = -101 ! ... step number. negative means use default. ... negative means use same value as for window CONV_file_aspect_ratio = -1 ! negative means use same value as for window ! ... negative means use same value as for window Surf_Hist_file_aspect_ratio = -1 ! ... negative means use same value as for window Power_file_aspect_ratio = -1 ! ...

... Telescopes . ... The spectrograph is installed in the Nasmyth focus of the BTA telescope, the equivalent focal length is 186 m (F/31). ... The preslit device unit is marked by number 3. ... Fig. ... slit unit of the MSS, 4.1 ? ... The spectrograph slit unit consists of a mirror that redirects the light beam from the Z axis and from the calibration path at an angle of 65њ to the axis of the telescope focus into the slit, the order separation filter, the block of the slit and the shutter (Item 4 in...

Peremennye Zvezdy", . ... Star Name: . ... During observations of a field in Perseus, we discovered a transient event. ... A total of 5 images with 5-minute exposures were obtained on JD 2455538. ... The combined image is shown under the light curve (top right panel). ... At the transient's position, an extremely faint star-like image is visible, marked as "Var"; its magnitude is approximately 13 m . ... Light Curve . The light curve of the transient and four images of the region around it. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Planets . ... Of the worlds in our Solar System (gas giants excluded) only Venus has a completely ice-free surface. ... The continued melting of polar ice and consequent freshening of the waters of the Arctic Ocean might stop some ocean currents €аaffecting the lives of hundreds of millions of people.€а Studying the ice worlds of space helps us understand the part that ice has played in the history of our own planet and our present day existence on it. ...

... Next: The PROS Big Up: Software Systems Previous: Data Reduction Software . ... The srcinten task provides PROS users with a tool to compute count rates for point sources in the ROSAT High Resolution Imager (HRI). ... Corrected upper limits are cited at locations where the count rate falls below the source detection threshold. ... Srcinten is a new PROS task that computes and applies the above correction factors to the net counts in a user-specified aperture. ...

... Plot description For each month separately the time intervals of the simulative magnetic conjugations between two spacecrafts are shown on the ASCII file and on the plots. - shows the month, which contains the time intervals of the simulative magnetic conjugations, . shows the month without conjugations. ... Click the button to access the ASCII file, which contains the coordinates of the magnetic conjugation between IB_AUR and IB_TAIL for the corresponding month and year. ... INTERBALL mission . ...

... GCN 8471 | ... TITLE: GCN CIRCULAR NUMBER: 8516 SUBJECT: GRB 081102: MASTER refind and final results DATE: 08/11/11 15:50:10 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.Parkhomenko Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalognikh Ural State GCN Circ 8470, Lipunov et al., ...

Enceladus . Saturn II . Enceladus [en-SELL-ah-dus] is one of the innermost moons of Saturn. ... Parts of Enceladus shows craters no larger than 35 km in diameter. ... This Voyager 2 mosaic of Enceladus was made from images taken through the clear, violet and green filters on August 25, 1981, from a distance of 119,000 kilometers (74,000 miles). ... Some regions of Enceladus show impact craters up to 35 kilometers (22 miles) in diameter, whereas other areas are smooth and uncratered. ...