Figure 4a. The defocus in arcseconds of blur on the image plane is shown as a function of time for the night of August 14. Arrows mark the times at which the telescope focus was manually changed. The labels show the magnitude of the changes made. The squares show measurements of the defocus just prior to and after manual focus changes. ... Below I will show clear indications of errors in the secondary motions which are probably contributing significantly to focus errrors in the telescope. ...

... We demonstrate through numerical simulations that model parameters estimated with our technique are essentially bias-free, even when the average number of counts per bin is 1. ... The IW technique avoids such biases by estimating through successive iterations, where for each iteration, j, , and the best-fit parameters are determined by minimization of . ... In our sample, we find that the minimum values and best-fit parameters converge after about 6 iterations. ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Astrophysics graduate student programs . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ...

[Top] [Prev] [Next] [Bottom] . The next few pages show a few selected examples of how the patterns work on astronomical observations. [Top] [Prev] [Next] [Bottom] . stevens@stsci.edu Copyright ї 1997, Association of Universities for Research in Astronomy. All rights reserved. Last updated: 07/24/97 15:33:47

. F IGURE . 4. Metallicity is plotted against galactocentric distance (a) and distance from the Galactic plane (b) for the globular clusters of thick disk (triangles) and old halo (circles). The slopes of linear regressions gives the values of radial and vertical metallicity gradients, corresponding. The points denoted with squares have been excluded from regressions according to the 3 rule. discussion in the text | previous figure | next figure .

... We can investigate projection of this distribution onto the celestial sphere in two ways: in terms of lines of constant SN frequencies per one square degree for all galaxies from the sample (Figure 36 ), and in terms of constant GW amplitudes at a given SN frequency per square degree (Figure 44 ). ... Figure 45: The sky distribution of the total supernova frequency from nearby galaxies in terms of lines of equal frequencies per square degree. ...

... Archives . ... DOE Petascale Data Analysis Program . ... Before using any adaptations of chi-square statistic, please spend a minute or two to ponder whether your strategy with chi-square belongs one of these categories. ... Chapter 10: On the Use and Misuse of Chi-square ? ... I wonder if XSPEC and Sherpa offers a tool to check the balance between the sum of observed counts and the sum of expected (model) counts. ... Category: arXiv , Bad AstroStat , Cross-Cultural , Data Processing , Stat | ...

PERFORMANCE COMPARISION OF KODAK DCS460 DIGITAL CAMERA AND PIXELVISION BACK-ILLUMINATED CCD . ... ABSTRACT : A Kodak DCS460 digital camera (with 1300 x 1000, 9-micron square pixels) and a PixelVision, back-illuminated digital CCD camera (with 1024 x 1024 elements, 12-micron square pixels) were tested at calibrated light levels ranging from 10 -2 footcandles to 10 -5 footcandles. The PixelVision back-illuminated CCD was shown to be 10,000 more sensitive than the Kodak DCS460 CCD camera. ...

... This example illustrates how to expand and contract the clipping region of a layer, without changing the wrapping width of the layer. ... Creating the Colored Squares . ... The basic aim of the changeNow() function is to start expanding the layer if it is fully contracted, or start contracting the layer if it is fully expanded. ... For each layer, it contains the HTML text for an embedded layer that displays the layer's number at a place that will be visible when the layer is fully contracted. ...

... Культовая серия Deus Ex возвращается! ... Глобальный заговор набирает обороты в "Недостающем звене" - масштабном дополнении к Deus Ex: Human Revolution. ...

If the cband cal was left off for many minutes and then turned on, it would take up to 5 seconds for the cal to go from 95% of the maximun value up to the maximum. ... Then toggle the diode off 5 secs, on 10 secs, off 5 secs, on 10 secs, off 10 secs. ... Figure 1 cband polA . Figure 2 cband polB . Figure 3 lband wide polA . ... Figure 5 lband narrow polA . Figure 6 lband narrow polB . ... Figure 10 430 dome polB Only cband has this problem of slowly approaching the maximum. ...

... Astrophysics Group . ... STFC announces бе119 million contribution to The Square Kilometre Array . ... SKA AAVS0 array . ... One of these is the Square Kilometre Array telescope . ... STFC has as well announced today a contribution of бе165 million to theб European Spallation Source and бе25 millionб to participate in the M3 Space Mission (PLATO).б  Speaking ahead of an event at Jodrell Bank Observatory Science Minister David Willetts announced the funding for the two projects. ...

... The hot star system known as MWC 922 , however, appears to be embedded in a nebula with just such a shape. ... A leading progenitor hypothesis for the square nebula is that the central star or stars somehow expelled cones of gas during a late developmental stage . ... Researchers speculate that the cones viewed from another angle would appear similar to the gigantic rings of supernova 1987A , possibly indicating that a star in MWC 922 might one day itself explode in a similar supernova . ...

... 2016 January 31 . MWC 922: The Red Square Nebula . ... Explanation: What could cause a nebula to appear square? ... A leading progenitor hypothesis for the square nebula is that the central star or stars somehow expelled cones of gas during a late developmental stage . ... Researchers speculate that the cones viewed from another angle would appear similar to the gigantic rings of supernova 1987A , possibly indicating that a star in MWC 922 might one day itself explode in a similar supernova . ...

. XMM-Newton Science Analysis System . ssclib (ssclib-3.33.4) [xmmsas_20080701_1801-8.0.0] . Meta Index / Home Page / A module which contains / Constants . Name . Value . Description . RootTwo . 1.4142135623730951 . RootThree . 1.7320508075688772 . RootTen . 3.1622776601683795 . RootPi . 1.7724538509055159 . XMM-Newton SOC/SSC -- 2008-07-01

... Old World First Asteroid Radar Echo. ... It testifies that 4179 Toutatis is a double object like asteroid 4769 Castalia. ... Interference of Radar Echo from the Binary Asteroid 4179 Toutatis. ... An analysis of the 6-cm radar data revealed quasi-harmonic oscillation of the echo’s “central” Doppler frequency with a period of about 14 sec and a deviation of about (0.7*B) Hz, where B is the echo bandwidth, which for 4179 Toutatis was equal to 2.1 Hz and 1.9 Hz for 1992 Dec 8 and 9, respectively. ...

. Hard-copy notes from this video. Back Main Data Handling Page .

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Magnetic (red squares) and non-magnetic (black points) Herbig Ae/Be stars plotted in a Hertzsprung-Russell diagram. ... Using the projected rotational velocities measured at the surface of the stars, we have calculated the angular momentum of the sample and plotted it as a function of age. We have then compared the angular momentum and the v sin i distributions of the magnetic to the non-magnetic HAeBe stars. ...

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... The Magazine . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Saturn "squared"? ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Оказывается, что этот классический результат Лагранжа можно гораздо естественнее и быстрее доказать, если использовать некоторые простые объекты математики 20 века: решетки, конечные группы и поля, алгебру кватернионов. При этом можно понять, что же, собственно, происходит и почему теорема Лагранжа верна, а по ходу дела и познакомиться с некоторыми важными понятиями современной математики. ...