... A new and powerful methodology for treating noise and clutter in astronomical images is described. ... trous wavelet transform, and the multiresolution support data structure. ... Figure 2: Top row: original noisy spectrum; filtered spectrum using the multiresolution support method; both superimposed. ... Figure 5 shows an image filtered by the wavelet transform (Starck and Pierre 1997a). ... Figure 5: ROSAT image of the cluster A2390 filtered by the method based on wavelet coefficients. ...

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

... Standard magnitudes can only be computed for the U, B and V filters and hence the only standard colours that can be calculated are U-B, B-V and U-V. An important point to note, is that these standard colours can be computed using the following instrumental colours - U-B, B-V, U-V, (UVW1-U), (UVW1-B), (UVW1-V), (UVW2-B) and (UVW2-V). ... The program loops through these colours and if the relevant instrumental magnitudes are present computes the standard magnitudes and standard colour. ...

Next: Hierarchical Wiener filtering Up: Noise reduction from Previous: The convolution from . Let us consider a measured wavelet coefficient at the scale i . We assume that its value, at a given scale and a given position, results from a noisy process, with a Gaussian distribution with a mathematical expectation , and a standard deviation : . ... We get: . ... This is done from the study of the variation of the noise between two scales, with an hypothesis of a white gaussian noise; . ...

... Recognition of Anomalous Events S. Monai 1,2 and F.Pasian 2 1 Osservatorio Astronomico di Brera Merate, Italy 2 Osservatorio Astronomico di Trieste, Italy Abstract. We present an original algorithm for the recognition of anomalous events in a CCD frame (i.e., cosmic hits, bad pixels etc.) ... Raw images, as read from a CCD, are often a#ected by some events which are revealed by anomalous pixel values, i.e., single saturated pixels or pixels at zero intensity (also named hot or bad pixels). ...

Optical Filters . A number of different choices are possible on WFPC2 in order to approximate the Johnson-Cousins system often used in ground based observing. These choices differ in throughput, wavelength fidelity, color transformability, and cosmetics. The HST science program as a whole benefits if a standard set can be agreed upon by the community for broad band photometry. ... These filters form the basis for the WFPC2 broad band photometric system. ...

... I have compiled a list of throughput filter curves from a variety of telescopes, instruments, and surveys. Click on the name of the filter to download it. The first line of each filter is the zeropoint for that filter. If the filter is in the AB system, it is listed as 0.0 (or in otherwords -48.55). ... Filter . Effective Wavelength . ... A_V . ... 0.987 . ... 0.050 . ...

. Position . Logical Name . Description . 0 . D . Stop . 948 . J . Standard Filter J (1.12-1.40?m) . 1896 . SJF . BandPass Filter (0.91-1.12?m) . 2844 . F1 . Hole . 3792 . EPS . LongPass Filter (1.65-2.55?m) . 4740 . H . Standard Filter H (1.48-1.82?m) . 5688 . FHK . BandPass Filter (1.76-2.12?m) . 6636 . K . Standard Filter K (2.00-2.41?m) .

Statistical Tools Statistical Tools and Techniques for Solar Astronomers Alexander W Blocker Nathan Stein SolarStat 2012 Statistical Tools Outline Outline 1 Introduction Objectives Statistical issues with astronomical data Example: filter / hardness ratios Standard approach Building a statistical model Using the model 2 3 4 5 6 Statistical ...

... Interim correlator, ri . ... The programs with "filter" in column 2 are filter programs that read from standard input and write to standard output. The filters are classified as to their data input and output types: . ... BtoB: binary input to binary output . ... Programs Table . ... scan an interim correlator datafile and output a summary of each scan in the file. corstripch . ... read an ainterim correlator or ri datafile and output each scan to a separate file (or a subset of scans). ...

This library currently provides subroutines used to transform theoretical spectra to intermediate and broad-band photometric indices. ... Typical tasks are the response functions and transmission curves for various filters, mirrors and photomultiplier windows. ... The response is zero outside the given wavelength range. ... real . input . Wavelength in nanometres . PHOT_1P21 . ... PHOT_AIR . ... PHOT_ALUM . ... Inputs must be valid as for PHOT_FILTER, PHOT_AIR, PHOT_ALUM and PHOT_1P21. ...

... As stable VLT work horses during the past 8 years obviously the two FORSes have in many ways also been instrumental to the definition of the VLT queue observing paradigm which includes both systematic collection of calibration data, online and offline reduction pipelines. The original concept for the photometric calibration and the FORS imaging pipelines involved acquisition of simple twilight images which were used for flatfielding, and observation of Landolt photometric standards. ...

... Superb optical performance coupled with time proven computerized pointing and tracking has made the LX200 ACF series a best-seller in the high-performance telescope class. ... MeadeтАЩs new LX70 Series offers high-quality German equatorially mounted telescopes with slow-motion controls and heavy-duty steel tripods. ... For crisp wide-field observing and imaging, few optical designs match the performance of a true triple-element apochromatic refractor. ... Meade Standard Field Tripod #07020. ...

... Original Xiaomi Mi Position Activated Carbon Filter . Brand: Xiaomi . ... Package Contents: 1 x Original Xiaomi Mi Position Activated Carbon Filter . Цвет: узор черный/экрю . ... Цвет: серебристый . ... Цвет: серый . ... Пол: Женский . ... Цвет: Синий . ... Пол: Для девочки . ... Джинсовая куртка темно-синего цвета марки MAYORAL для девочек. ... Цвет: белый . ... Цвет: Черный . ... Пол: Мужской . ...

Optical and UV Spectrophotometric Standard Stars . ... Apache Point expresses its thanks to J. R. Walsh and to ESO for allowing us to place a copy of these pages at Apache Point. ... Access to the standards is either through: . ... The data for the standard stars come from four sources: . ... Data for 23 stars based on IUE and optical spectra and calibrated by the primary WD standards. ... The data from which the plots were produced are also available by ftp access from the standard star pages. ...

The original files with the data were in different formats. ... Such files were named "standard data files" and linked to the database. They can be easily transformed to any desirable format by a code. Here we present two simple computer programs of this kind. ... When running the code, you can specify columns in the output file: wavelength, energy (eV) or wavenumber (cm -1 ) as the first column, and complex refractive index or dielectric function as the second and third columns. ...

... There are compelling reasons for the pulsar community to utilise a standard data storage format. For example, standardisation of file formats significantly decreases the amount of effort required to integrate new instruments into the analysis chain. ... Accordingly, we have defined PSRFITS as a standard FITS-based format for pulsar data files. ... For example, the first line of Processing History HDU contains information about the data acquisition program and the initial structure of the file. ...

splitxyz - filter to divide (x,y,z[, distance ,heading]) data into (x,y,z) track segments . splitxyz [ xyz [ dh ] file ] -C course _ change [ -A azimuth / tolerance ] [ -D minimum _ distance ] [ -F xy _ filter / z _ filter ] [ -G gap _ distance ] [ -H [ nrec ] ] [ -M ] [ -N namestem ] [ -S ] [ -V ] [ -Z ] [ -: ] [ -bi [ s ][ n ] ] [ -bo [ s ] ] ... If xy _ filter is non-zero, the data is first divided into segments and then the x,y values of each segment are filtered separately. ...

RTT150 . Russian-Turkish 1.5-m Telescope . ... Until 2002 observations were mostly performed with ST-8E CCD in the 1:7.7 Cassegrain focus. ... In April, 2003 telescope was equipped with a larger-size CCD Andor DW436 . ... 2048 x 2048 pixels, . ... Since summer of 2002 the main focal detector of the RTT150 telescope was AP47p CCD in 1:7.7 Cassegrain focus. ... During September 3-13, 2002 works on installation of new autoguiding system ( photo 1 ) were carried out on RTT150 telescope. ...

Russian Version [ MS-Win ] . ... Satellite data ] . ... The program is a powerful tool for multi-purpose image analysis and processing. It operates on files in main standard image storage formats: TIFF, BMP, GIF, PDF. The program contains a rich collection of operations for visual image quality improvement: linear and logarithmic normalization, equalization, brightness transformation by arbitrary look-up table, etc. ... ALMAZ-1 satellite data processing . NOAA satellites data processing . ...