... Mindful of these biases, I can now explore the relations between the measured rotation periods and various other observables. The hypothesis behind monitoring stellar variability is that active stars have asymmetric spot distributions on their photospheres. ... They found that only stars with rotation periods greater than seven days show variations greater than 0.4 magnitudes at I. Bouvier et al . ... 1993a) demonstrated a relation between X--ray flux and spectral type in ZAMS stars. ...

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• Evolutionary Effects

Astronomy Discussion Forums . ... New Theory Of Relativity [Nwobu's Effect] . ... Post Message | ... Nwobu’s effect is an optical theory of relativity that explains the principle of physical observation. ... I observed this phenomenon and started solving it mathematically but it latter, turned out to be a Special Theory Of Relativity. ... www.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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• FURTHER EXPLANATION [NWOBU'S EFFECT] - an Astronomy Net Observation_reports
• The END Of The DARK ENERGY - an Astronomy Net General Forum Message

IBIS Data Analysis . ... IBIS . ... Flat Fielding - Introduction . The images obtained by IBIS will have intensity variations across the field of view that are not due to the solar image, but rather caused by instrumental effects that alter the observed intensity in each point of the field of view. ... IBIS Flat Fielding Techniques . ... Therefore, it is desirable to obtain the flat field measurements center on a point along the equator near the heliographic center of the solar disk. ...

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• A universal physical relation for quasars
• Educator's Guide to Spotting the Shuttle
• A collection of images

... The first column shows the kinematical diagrams, where is the angle between the line of sight on the object and the vector of rotation about Z -axis, and V S is objects line-of-sight velocity relative to an observer at rest at the position of the Sun. The straight lines are regression fits, whose slopes yield the subsystem’s rotation rate. The second column shows the relations between metallicity and distance from the Galactic plane. ... privious figure | next figure . ...

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• Mid Scales Role
• Vertical Structure, figures

... A document window is shown, with 8 lines (numbered 1 to 8), each 24px high. The text of the "outer" box (at the end of line 1, halfway into line 2, and halfway into line 3) is shifted upward 12px. The text of the "inner" box, thought shifted upward as well, has been relatively positioned so that it lies in its normal flow position at the end of line 2. ... The lines, as they appear in the image, contain: Start 1 Beginning of body contents. 2 of outer contents. Inner contents. ...

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A Fog Bow Over California . ... What is being seen is a fogbow , a reflection of sunlight by water drops similar to a rainbow but without the colors. ... The fogbow 's relative lack of colors are caused by the relatively smaller water drops . The drops active above are so small that the quantum mechanical wavelength of light becomes important and smears out colors that would be created by larger rainbow water drops acting like small prisms reflecting sunlight. ... NASA Official: Jay Norris. ...

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• A Fog Bow Over California
• XWare > APOD

... Why this is interesting: reasons for which astronomers get very excited around this time, and how your help can be valued for scientific research by Dr Apostolos Christou (Tolis), Armagh Observatory . Observing times . ... A variety of observing methods are suitable for the scientific study of mutual events. ... Time . The need for accurate time information is as important as the need for a reference object. ... International Year of Astronomy, Ireland National Node . ...

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• Armagh Observatory
• SCL Sfit SLV Commands
• Leap Second 2008

Program Id: . ... UTC End Time: . Astronomer/PI Name(s): . ... Observer Name(s): . Nightlog Day: Sunday Monday Tuesday Wednesday Thursday Friday Saturday Month: January Febuary March April May June July August September October November December Day (DD): Year (YYYY): Full Night A (First half) B (Second half) Special Schedule . ... Note: Open this weather logfile program in another browser window. Please copy and past the resultant info below at the end of the night) . ...

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• Spectrographic time budget
• Telescope Tracking Smoothness
• ARC 3.5m | AGILE

... For more distant stars we must use other techniques. ... Hence if we see a distant galaxy and can pick out any cepheids lying within it, we can calculate its distance. ... Here then is another method to gauge the size of the Universe and there are yet more. volume at high enough temperature a nuclear fusion reaction sweeps across the white dwarf's surface and eventually we will see a spectacularly bright new star (hence nova) in our skies. ... Why is this relevant to the size of the Universe? ...

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• http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/hubble.pdf
• http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/Parallax.pdf
• Was the 21 September Fireball a Second Moon? | Astronotes

... The Stellar Oscillations Network Group (SONG) seeks to study p-mode (acoustic) oscillations in solar type stars. ... The observation of many solar-like stars will also help us to understand how solar p-modes are excited and damped. ... Naively, the two or three orders of magnitude improvement over this provided by the normal 1 second time resolution of the KPNO CCD cameras should be quite sufficient for such a detection. ... Figure: Non-cadenced data-a free-running observing sequence. ...

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• ISO-SWS Data Analysis
• NICMOS Calibration Pipeline: Processing Associations of Exposures
• Star Finding and PSF Determination using Image Restoration

Contents. planet: 5 - Jupiter satellites: 320 - S/2003 J 20 - Carpo J-46 : 2 total number: 2 type: absolute dates: 2003-2003 observatory: 568 - Mauna Kea Reference. ... Year of the moment of observation 3. Month of the moment of observation 4. Day of the moment of observation with decimals 5. Hour of right ascension (alpha, h) 6. Minute of right ascension (alpha, m) 7. Second of right ascension (alpha, s) 8. Degree of declination (delta, deg) 9. ...

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• jo1039
• jo1036
• jg0026

... They are concerned with Attitude Control System of the spacecraft, satellite visibility from tracking stations, limits on the satellite autonomous operations during the orbit, and needs for auxiliary operations with the spacecraft. ... Among the operational constraints the most important one is the number of programmed slews per orbit, which determines the maximum number of radio sources to be observed during one orbit. ... System temperature (K) . ... Progress of the RadioAstron Project in Pictures...

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... The choice of the spectrograph design (Fig.2) is determined by the quantity R, the overall dimensions of the PF cage and the restrictions on the rigidity of the structure of the device. ... As the camera's objective a fast 4-lens aplanat is used having a focal distance F cam =140 mm and a relative aperture of 1:1.8, the resolution at the centre is no less than 80 gr/mm, that over the field at a distance of 3 mm from the edge along the frame ( ) diagonal is 35 gr/mm. ...

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• Observational data
• Discussion
• di_eks

This module provides for the generation of Expires HTTP headers according to user-specified criteria. ... This module controls the setting of the Expires HTTP header in server responses. The expiration date can set to be relative to either the time the source file was last modified, or to the time of the client access. ... ExpiresByType . ExpiresDefault . The ExpiresDefault and ExpiresByType directives can also be defined in a more readable syntax of the form: . ... Module: mod_expires . ...

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• Hints on Running a High-Performance Web Server

To give a relative path to a file below your current directory: pwd (prints the current directory) /home/eucs/jane (the full pathname to the current directory) ls -l presentation/docs/oview.html (lists information on the file) . ... To define a file that is in another directory: pwd (prints the current directory) /home/eucs/jane/presentation/docs (the full pathname) cd ../illustrations (use relative pathname) pwd (check the current directory) /home/eucs/jane/presentation/illustrations . ...

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• Copying files to another host
• Copying files from another host
• Changing to another directory

... During the analysis of the surveys carried out on RATAN-600, it was found that almost one fifth of the detected sources shows significant radio flux variations. ... We used the data from "Cold" radio surveys carried out with RATAN-600 in 1980-1994 to search for radio sources with significant flux variability. ... On possibility of detection of variable sources using the data of Cold surveys carried out on RATAN-600. ... Detection of Variable Sources Using the Data of "Cold" Surveys. ...

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• Evidences of supercritical accretion onto black hole in SS433
• Galaxy sector, archive 2014
• Detection of radio pulsar pairs

... Home Education Classes AAA Winter Astronomy Class: Measuring Distances in Space тАУ Dec 2015 тАУ Feb 2016 . ... Classes . AAA Fall Astronomy Class: Astronomy Basics тАУ October-November 2015 . AAA Winter Astronomy Class: Measuring Distances in Space тАУ Dec 2015 тАУ Feb 2016 . AAA Spring Astronomy Class: The Physics of Astronomy тАУ February - March 2016 . ... This MonthтАЩs Sky тАУ April 2016 . ... Dec. ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ...

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• Amateur Astronomers Association of New York ? Amateur Astronomers Association
• Upcoming Events ? Amateur Astronomers Association of New York
• Links ? Amateur Astronomers Association of New York

... The colors indicate the relative motions of galaxies with accurately measured distances, with shades of green and blue indicating motions toward us and shades of yellow to red indicating motions away from us. Our nearest neighbors have only small relative motions (represented by yellows and greens), as seen best in the exploded view of the right panel. We, along with all these nearest neighbors, are moving together toward the lower right corner of the figures. ...

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• Observing Basics: Distances in Space | Astronomy.com
• Is Mars red because of iron corrosion? If so, what process caused it to occur?
• Do scientists know what caused Valles Marineris on Mars? | Astronomy.com

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... One of the rarest but most interesting effects which can be observed with the Irkutsk IS radar is anomal high power signal registraion(coherent echo) due to strong magnetic storms. ... These signals are formed at E-layer heights in the presence of a strong electric field which causes particles to drift. ...

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... Fitting the observed dependence includes calculations of the polarization cross-sections averaged over particles orientation and size distribution, their normalization and the comparison of obtained dependencies with Serkowski's curve representing observational data for a chosen star. ... Variations of the polarization factors with wavelength are shown in Fig. 16 for homogeneous spheroidal particles with PF orientation. ... The distinction between prolate and oblate spheroids is also clearly seen. ...

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• A Nature of Polar-Ring Candidate Galaxy ZGC 2315+03
• Optical constant database - Level: measurement/paper
• Database of Optical Constants -- Level: welcome