Astronomy Picture of the Day . ... 4.12.2007 . ... Credit: Tom Matheson ( Guidescope.net ) Explanation: An analemma is that figure-8 curve that you get when you mark the position of the Sun at the same time each day throughout planet Earth's year. Above, 26 separate exposures were recorded to illustrate the regular solar motion -- a difficult project performed mostly during the calendar year 2006. ... Publications with keywords: analemma - Sun . Publications with words: analemma - Sun . ...

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• Астронет > Movie: Analemma Over New Jersey
• Астронет > Fomalhaut Dust Disk Indicates Planets
• USNO A2.0 Catalog: A Digital Sky

... 2007 December 4 . Movie: Analemma Over New Jersey . ... Above, 26 separate exposures were recorded to illustrate the regular solar motion -- a difficult project performed mostly during the calendar year 2006. The images were taken at 8 am in the morning in northern New Jersey , USA , and digitally combined with a single foreground image later. The individual images have since been combined into a movie . ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...

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• APOD: 2004 February 24 - X-Rays Indicate Star Ripped Up by Black Hole
• APOD: 2006 August 2 - Methane Rain Possible on Titan
• APOD: 2003 November 22 - Moon AND Sun

Making HST Pictures: Examples and Illustrations . ... These illustrations represent some of the steps and techniques used to produce “pretty pictures” from HST images. ... TIFFs (ftp) . ... Separate images are exposed through different color filters. ... An alternate way to make color images . ... Eight bit (one byte) images contain 256 different values that may be represented by 256 shades of gray or 256 arbitrary colors from a color map (or palette) of all possible colors. ...

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• CSPICE Routines: GETMSG_C
• Association Keywords
• WFC3 Aperture Coordinate System

This diagram shows how the 'vertical-align' properties on cells combine to determine the height of the row containing the cells. The diagram also illustrates the meaning of some values of 'vertical-align' that apply to table cells: baseline, top, bottom, and middle. The diagram shows a row of five (labeled) table cells of varying heights and alignments. ... The first cell is aligned with the row baseline and extends to just below the row top. ...

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• Long description of example illustrating the collapsing borders model
• Tutorial on Fortran 90, Digital UNIX

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

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• Rapid Changes in the Inner Coma of Comet Hyakutake
• ArtistтАЩs impression of GJ 1214b in transit | ESO
• ArtistтАЩs impression of a gamma-ray burst shining through two young galaxies

... The combined exposure map covers the area defined by rgsangles as the minimum and maximum legal values ( TLMIN and TLMAX ) for BETA_CHANNEL and XDSP_CHANNEL . ... Even so it is nevertheless possible for the camera to drift outside these bounds, and in that case the combined exposure map is truncated with respect to the aggregate of node-specific maps (which are aligned to the same grid but not confined by it). ... The combined map is output to its own dataset, separate from the event list. ...

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• XSPEC session thread
• Parameters

... Values have been scaled arbitrarily. High ratios are shown in blue, corresponding to blue colors, and low ratios are shown in red, corresponding to red colors. ... Noise combined with background subtraction difficulties in the lower left quadrant of the WISP1 data (see Fig. \ref{Fig:wisp_snr_mskd}) make colors in this area very unreliable. ... The values shown here are typically a factor of ~3 less than those calculated for the Schmidt data, shown in Figure \ref{Fig:bj_alpha}. ...

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• VIRGOHI 21
• Disclaimer National Astronomy and Ionosphere Center (Arecibo Observatory)

... News | ... ASKAP News . ... According to Dr Aaron Chippendale, ASKAP research engineer, this is a great step towards understanding the new first-of-kind system. тАЬCapturing 188 radio signals and transporting them over 1.4km of fibre with low noise reflects a key success of the ADE design in the field,тАЭ said Aaron, тАЬThese preliminary results are extremely encouraging and indicate that phased array feeds will achieve the system temperature we want for ASKAP, and ultimately, the SKA.тАЭ . ...

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• Project CLEA: Digital simulations in the Introductory Laboratory
• uvflag
• Generalized Faraday rotation

Suzaku explored faint X-ray emission of hot gas across two swaths of the Perseus Galaxy Cluster. The images, which record X-rays with energies between 700 and 7,000 electron volts in a combined exposure of three days, are shown in two false-color strips. Bluer colors indicate less intense X-ray emission. ... Red circles indicate X-ray sources not associated with the cluster. Inset: An image of the cluster's bright central region taken by NASA's Chandra X-ray Observatory is shown to scale. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B012D8400-CE53-4BEB-BC4F-4ACDF527D941%7D
• New Cassini data from Titan indicate a rigid, weathered ice shell |
• Brown dwarfs, stars share formation process, new study indicates | Astronomy...

... The COMBINE/CCD command offers the possibility to combine a number of input images using different combining methods. COMBINE/CCD takes three input parameters at maximum: the exposure type of the images to be combined, the input frames themselves and and output frame. ... In the case of DO input (association) table, from the name of the output calibration frame in the table the command extracts the names of all requested single calibration frames and combines these frames in the output frame. ...

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• Saving and Loading Session Parameters
• Combining Methods
• Performing Batch Reduction

... The axial support is provided by 78 air pistons. ... The transverse support is provided by 38 air pistons, supported by cantilevers from the mirror cell, that act on the mirror local center of gravity surface. ... The locations where the transverse mirror support forces should be applied to the mirror are listed in Table 1 and illustrated in Figure 1. ... Figure 1: CAD drawing showing the 2.5-m primary mirror and the locations of the transverse support posts (black) and axial pneumatic pistons (blue...

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• Astrophysical Research Consortium - Apache Point Observatory
• Astigmatism II
• Tracking error budget

DIGITAL WDC EXCHANGE FORMAT . FOR OBSERVATORY 1.0 MINUTE VALUES 1. ... DATA-1 .. DATA-60 are 1-minute values of the given element for that hour. ... Typically, digital 1-minute values received by WDCs from organizations operating automatic magnetic observatory instruments are averages of more frequendy sampled values, e.g. 10-second point samples. ... If the method used to obtain 1-minute average values is important to a user, the WDC will assist in determining the exact procedure applied. ...

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... Many boards supported by comedi have digital input and output channels. ... Comedi groups digital channels into subdevice, which is a group of digital channels that have the same characteristics. ... Individual digital lines can be read and written using the functions comedi_dio_read(device,subdevice,channel,unsigned int *bit); comedi_dio_write(device,subdevice,channel,unsigned int bit); . ... It indicates that an external digital line should be used to trigger the event. ...

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• Optimization of spectroscopic observations
• fork()
• Comedi Reference

ASTRONOMICAL YEARBOOK FOR 2005 (in Russian) . Preface . In the тАЬAstronomical YearbookтАЭ (AY) the ephemerides of the Sun, Moon, major planets and stars computed with the maximum precision in accordance with the resolutions approved by the International Astronomical Union (IAU) are published. ... N.I. Glebova; . ... The seasons values, the phases of the Moon, the planetary configurations, the data for the eclipses of the Sun and Moon (N.I. Glebova, M.V. Lukashova) are placed on a site . ...

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• AY2006 (preface)
• AY2011 (preface)
• AY2008 (preface)

This is a color composite image made by Karen Gloria at Hopkins Observatory using a 6-inch refractor and a 512x512 element CCD detector. This is the famous Trifid Nebula, often photographed. It is a nice illustration of the combined effections of ionization and scattering caused by the large yield of blue and UV photons from newly formed massive stars.

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• Digital Stellar Spectra
• Thermal History of the Universe
• CCD Astronomy Magazine Article Page 5

... We report on the preliminary results of experiments using a Bayesian cluster method to cluster objects present in photographic images of the POSS-II. ... We believe that the application of such algorithms to large-scale astronomical sky surveys can aid in cataloging the detected objects, and may even have the potential to discover new categories of objects. ... We have thus started to explore new clustering analysis and unsupervised classification techniques for this task. ...

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• NICMOS Calibration Pipeline: Processing Associations of Exposures
• ADASS VIII Cover Illustration
• ADASS VII Cover Page

... are preliminary IAU-style names for ChaMP objects. Finalization of names awaits the final systematization of optical coordinates and source identification. ... The yellow regions highlight atmospheric telluric bands at ~6900A and ~7600A. The optical ID, X-ray ID, classification, and redshift are given at the top of each plot, and a series of lines are shown that are often found in sources of that given classification. ... HS limit? ... g' band magnitude; calibrated SExtractor Kron mag or limit . ...

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• V616 Mon (A0620-00)
• Possible Pitfalls
• The AstroStat Slog Blog Archive [tutorial] multispectral imaging, a case study

... An analysis on new observational data taken with the MPFS and SCORPIO spectrographs indicates that we are dealing with the "galactic wind": the gas is blown above the galactic plane with the characteristic velocity of about 130km/s. The gas outflow is caused by a combined action of winds from the supernovae and young massive stars located in the galaxy's circumnuclear region. ... The most probable hypothesis is that the accretion of intergalactic gas clouds is feeding their star formation. ...

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• Electronic version of Russian Bulletin
• Sun image
• Contacts

CLEAN Map gif -- is a plot of the naturally weighted CLEAN image. The red dashed contours indicate negative flux. The beam is shown in the bottom left corner of the images. The plot is in GIF format.

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... From the chain visibility point of view, it is very recommended to look at the Javascript movies , especially if the frame rate can be not regulated in your MPEG player. ... The non-CH-associated large-scale chains visible on the SOHO/EIT images at three wavelengths of 171, 195 and 284 as well as on the MLSO/HAO He I 10830 spectroheliogram of December 16, 1997. ... The SOHO/EIT movies at 171 and 195 show the chain dynamics on June 1-3, 1998. ... Javascript movie (230 KB), SOHO/EIT, 171 . ...

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• The 14 July 2000 meter-wavelength dynamic radio spectrum