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; . ...

Instrument Science Report ACS 2005-09 The Internal CCD Flat Fields R. C. Bohlin & J. Mack July 18, 2005 A BSTRACT The internal flat field lamp has been used since launch to monitor the stability of the ACS HRC and WFC flat fields. ... Introduction Multiple observations of the internal flat field lamp have been taken via proposals 9562, 9657, 10049, and 10376 with the HRC and WFC in filters F435W, F625W, and F814W. The purpose is to measure any trend in the CCD flat field structure. ...

... Actual stars are expected to be more complicated than these simulations. ... The spot may be entirely visible most of the time (one would observe a prolonged flux minimum low), and then part of it may disappear over the horizon briefly and then return (slow rise and then fall back to constant level). ... With the set of observations taken here, I have information available from several comparison stars and color information. ... The period found must be consistent with the data from any given night....

... This gives a nice opportunity to check the quality of the FIRPO photometry against that of TIRGO. ... The values are Program POLYFIT V 10/Jul/90 ( A.Richichi ) - 24-Aug-1997 13:38:25 File : diff_temp_jc.dat Pol. degree: 1- N = 10- [ 2786.00- 4095.00 ] - [ 0.00- 1194.00] 1 -.10304E+01 0.26412E+00 2 0.29958E-03 0.74406E-04 sdev: 0.16063E+00 chi2 :0.24486E+01 Program POLYFIT V 10/Jul/90 ( A.Richichi ) - 24-Aug-1997 13:42:59 File : diff_temp_hc.dat Pol. degree: 1- N = 10- [ 2786.00- ...

ARCSAT ID NUMBER: AS01 DESCRIPTIVE TITLE: Stromgren Photometry of Galactic Streams PI: Dmitry Bizyaev OBSERVER(S): Dmitry Bizyaev UNCERTIFIED/UNTRAINED OBSERVERS: N/A COLLABORATORS: CONTACT INFORMATION: dmbiz @ apo.nmsu.edu TIME REQUESTED: 3 weeks in the dark time between May and October 2014 The preferred time slots (based on Mon - Sun basis) are: May 5 - 11 June 2-8 September 22 - 28 INSTRUMENT: SurveyCam FILTERS : ... The standard Stromgren set is available at APO. ... 2014). ...

Blackholes2 Forum Message . ... Post . ... Shifts Are As Would Be Expected. ... Post Message | ... Red and blue shifts can be caused by velocities also. ... The expectd result would be a red or blue shift proportional to the aparent distance an object is from the observer. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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Proposal Identification No.: ... Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours Next Semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time : Expected Data Storage: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 61.5 0 0 0 2 hours less than 100 GB What SDSS Misses: A Pilot Program to Find More Low Mass ...

... Analysis of in-orbit data closely follow the CSL data analysis. Stars with known astrometric positions are matched with their image centroids. ... The measured position, the expected position and the offset between the measured and expected positions are calculated and written into a file. ... select catalogued positions for different observations/pointings (e.g. positions of objects in photometric sequence) . ... The new distortion map was generated from in-flight observations of the G153 field. ...

Next: The derived luminosity and Up: The galactic population of Previous: The galactic population of . Figure 16: The observed distribution of pulsar dispersion measures. Dotted curve is the total known population, solid curve is the Parkes survey. Figure 17: The observed distribution of pulsar distances above the galactic plane. ... Figure 18: The observed distribution of pulsar flux densities. ...

Trail encounter . ... Expected meteor rates . ... The Leonids are the debris of Comet 55P/Tempel-Tuttle. ... The Earth's passage right through the centre of trails is associated with the most spectacular meteor displays (studies show that, as well as how close to the centre of the trail you are, the strength of the display also depends on how far along a trail's length you are). ... The encounter with the 1932 trail will lead to enhanced meteor activity: a nice outburst, but below storm level. ...

Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 02 - 08.02.2015, Forecast on 09 - 16.02.2015, Carrington Rotation 2160 (1,28.02.2015) SUNSPOT-FORMING ACTIVITY OF THE SUN REMAINED AT THE MIDDLE LEVEL ALL DAYS. ... NEXT WEEK EXPECTED THE AVERAGE LEVEL OF SUNSPOT ACTIVITY. ... FLARE ACTIVITY WAS AT THE MODERATE LEVEL ON 04.02, AND THE LOW ON OTHER DAYS. ... BY DATA OF CORONOGRAPHS SOHO AND STEREO WERE OBSERVED > 21 CME. NO EARTH-DIRECTED CME WERE OBSERVED THROUGHOUT THE PERIOD. ...

Welcome to K -corrections calculator, simple service allowing one to determine K -corrections of a galaxy, given its redshift and one or more colours. ... K -correction in choose filter.. ... Redshift . Colour choose colour.. Colour value . Calculator . ... calculate spectral energy distributions , K-corrections calculator , GALEX FUV NUV , UKIDSS YJHK , K-corrections of galaxies , spectral based k-corrections , SDSS filter set K-corrections , K correction code IDL , kcorrect IDL C , . ...

Following are instructions to build and install the programs in this distribution. Make sure that you have all necessary tools for building executables. ... The automatic build process expects a configuration file called Config.local . ... The configuration file specifies the directory in which to install the binaries, as well as control over the generation of debugging code and reference clock support. ... Cleans out object files, programs and temporary files. make distclean . ...

... From the peculiar shape of the light curve in the visible spectral region (a long phase interval of light constancy was observed by Hensberge et al. in 1981 ), HD 56022 had been expected to show unambiguously the nonequatorial symmetry of its surface brightness distribution. However, analysis of the light curve has yielded a possible equatorial position of a spot. ... A solution seems only possible, if the light constancy over the long phase interval in the visible is not observed in the UV. ...

Astronomy Picture of the Day . ... Right now, however, a new comet has brightened unexpectedly and is visible as a faint streak to the unaided northern observer in the eastern morning sky just before sunrise. ... Comet Pojmanski , officially designated C/2006 A1 and discovered only in January, now sports a turquoise tail several times longer than the full moon. ... Publications with keywords: comet - comet tail . Publications with words: comet - comet tail . ... Comet Holmes Over Hungary . ...

Some peculiarities of orbits of observed comets. ... Icarus, 2005 Simulation and reality Distribution of anti-perihelia of short-period comets with e 0.9 ( ecliptic coordinates ) Distribution of anti-perihelia of short-period comets with e 0.9 ( ecliptic coordinates ) Distribution of anti-perihelia of long-period comets with 0.9 e 1 ( ecliptic coordinates ) ґ ...

... Tonight's Sky . ... Observing . ... Bob Berman . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Dave's Universe . ... Bob Berman's Strange Universe . Bob Berman's strange universe: Expect a surprise . ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Meade Instruments Corporation . ... Meade Pictor 616A Color Filter System Instruction Manual . ... Remove the Meade Pictor 616A Color Filter System from the telescope or camera. Use the supplied hex wrench to remove the three screws from the telescope side of the Meade Pictor 616A Color Filter System. Position your Meade Pictor 616A Color Filter System to align with the diagram below. ... Carefully screw each filter into the wheel, and re-assemble the Meade Pictor 616A Color Filter System. ...

Next: NICMOS/HST H-band (F160W) Images Up: NICMOS Science Previous: HST NICMOS Observations of . ... Observations of P . ... The NICMOS team has devised a comprehensive program of observations of the Galactic Center. ... Data in hand give a first look at variability and a detailed look at the search for the tip of the main sequence will be discussed where NICMOS has demonstrated adequate sensitivity and photometric precision to identify likely O8-B1 stars at the Galactic Center. ...