... Given the observing time and frequency, task plplt plots the expected visibility function for a planet. You will most likely want to check this visibility function before observing and discovering that the planet is resolved out! NOTE that mfboot and plplt do not include the effect of the ATCA's primary beam - the planet is implicitly (and silently) assumed to be small compared with the primary beam. ... Information on using the ATCA to observe a planet is available on-line . ...

The Cycle 11 calibration program will be defined a few months after the Phase II deadline for approved programs. ... In special situations it is possible that observers may find the STScI calibration programs do not meet their needs. ... In these cases observers may propose to obtain their own calibration data. ... During Cycles 9 and 10, two WFPC2 Calibration Outsource programs were awarded. ... Results of both programs will be disseminated via the WFPC2 WWW site, as results become available. ...

... Comet Ikeya-Zhang, designated C/2002 C1 (Ikeya-Zhang), is named after Kaoru Ikeya of Shizuoka prefecture, Japan, and Daqing Zhang of Henan province, China, who independently discovered it on the night of 1 February 2002. A preliminary orbit reported the following day indicated that it would come moderately close to both the Earth and the Sun and that it might become visible to the naked eye during late March and April 2002. ... Bailey, M.E., Clube, S.V.M. and Napier, W.M. The Origin of Comets . ...

... 2006 March 6 . Unexpected Comet Pojmanski Now Visible . ... Explanation: Have you ever seen a comet? ... Comet Pojmanski , officially designated C/2006 A1 and discovered only in January, now sports a turquoise tail several times longer than the full moon. Comet Pojmanski 's ion tail is due to gas particles expelled by the comet being pushed away from the Sun by the solar wind , the same wind that ionizes gas in the tail causing its blue tint. ... About APOD | ... NASA Official: Jay Norris. ...

... The hotter the gas, the faster they move, and the more energy each of them holds. The free ions and electrons in a plasma behave the same way. Knowing the temperature of the high atmosphere of Earth, or that of the Sun, we can calculate energies expected of ions and electrons found there. However, ions and electrons actually observed in space are often much , much more energetic, and may move at a respectable fraction of the velocity of light (300,000 km/sec or 186,000 miles/sec). ...

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 . ...

... P2864 Arecibo Observatory Date Received: 2013-Sep-03 16:15:21 William E. Gordon Telescope Observing Time Request COVER SHEET Section I - General Information Submitted for Sep 1 2013. ... We are requesting a total of 70 hours of observations at L-band over the course of one year, with an observation per day for the first ten days, then additional observations taken approximately once every other week there after. ... For these observations night-time is not needed. ...

... Science . ... Science Users Information > Data Handling and Products > Data Reduction FAQ > I see unexpected boxy emission-like features in my REDL spectra - where do they come from? ... Observing with ESO Telescopes . ... ESO-MIDAS . ... ESO Data . ... The pipeline by default interpolates across the bad columns in the REDL CCD when it creates the master bias, but does not so when it processes the science data. This inconsistency can create boxy emission-like features as seen in the figure below. ...

... 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....

... Information about a variety of different calendars for different cultures (e.g., Christian, Jewish, Muslim, Chinese, Hindu etc.) ... In addition, the Chinese had two different ways of interpreting and observing celestial events. One way the Chinese used astronomy was known as lifa; it was a discipline that aimed to understand the regularities and the predictable events in the celestial system through careful, observations, measurements and records. ... back to Teachers' Newsletter Main Page ...

... INSTRUMENT: SurveyCam FILTERS: Stromgren uvby, 2" square COMMENTS: remote observations are expected BRIEF SCIENCE JUSTIFICATION: Last decade numerous faint structures at the periphery of regular galaxies, as arcs, tails, or streams, have been discovered (see e.g. Martinez-Delgado et al., ... The broad-band photometry is used for observing the faint structures, but it does not allow to break the age-metallicity degeneracy efficiently. ... The standard Stromgren set is available at APO. ... 2014). ...

... 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. ...

... December 30, 1998 . Supernova 1994D and the Unexpected Universe . Credit: High-Z Supernova Search Team , HST , NASA . Explanation: Far away, long ago, a star exploded. ... Supernova 1994D was not of interest for how different it was, but rather for how similar it was to other supernovae . ... The large number and great distances to supernovae measured in 1998 have been interpreted as indicating that we live in a previously unexpected universe . ... About APOD > . ... NASA Technical Rep.: ...

... CI ) - Cm (I )) ( = 2 (I) N 2 2 PKS0558-504 simultaneous fitting The Chi-Squared is the most common statistic in use to fit a function f to data {x, y} : = 2 N ( yi - f ( xi )) 2 2 i N = number of data points i2 = variance (related to the measurement error for yi ) y = independet variable x = dependet variable f = assumed relationship between x and y yi = observed mean f(x i ) = predicted mean Statistical concepts relevant to data ... 2 * < 1 { (I) OVERESTIMATED} BAD FITTING!! ...

The Chi-Square Goodness of Fit Statistic . This statistic enables us to test whether observed frequencies are close to . those we would expect. ... Expected frequencies . ... For example, if we . have an honest die we would expect 1/6 of all cases to show any of . ... So, for example, if we roll a die 60 times we would expect : . ... If we actually roll a die 60 times we wouldn't expect each of the faces . ... times each face actually comes up is the observed frequency for that face. ...

... Observing . ... Solar Observing . ... April 3 (SUN) - Solar Observing, Central Park , Manhattan . ... APRIL'S SKY . ... Lecture Series at the American Museum of Natural History The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the .. ... The€аAmateur Astronomers Association of New York€аwas organized in 1927 to promote the study of Astronomy, emphasizing its cultural and inspirational value. ...

... A star party is a gathering of amateur astronomers who set up their telescopes and observe the dynamic night sky. ... Star parties are best scheduled during first quarter and waxing gibbous Moon. During full moon, the moon is so bright it obscures a view of other celestial objects and even the Moon is best viewed when NOT full. ... We will consult local weather forecasters and make a decision by 2:00p on the day of the star party. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

Next: The ESO VLT CCD Detectors Software . ... Up: Instrument-Specific Software . ... The framework for data calibration and analysis of the VLT instrumentation is presented, based on the concepts of a calibration plan, pipeline calibration, quality control, and archiving of calibrated data for a ground-based observatory. ... Quality Control Pipeline provides quality assessment for instrument performance data and observing conditions, and tests the results of the Reduction Pipeline. ...

... We compare our results with the GRANAT X-ray observations of the Galactic center (Churazov et al. ... It is instructive to compare our results for the Galactic center starburst with what might be expected for a continuous star formation, with the average rate characteristic for the whole Galaxy. For this continuous star formation model, we would expect to observe in the region of around the Galactic center about 10% of the total number of X-ray sources in the Galaxy. ...

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" . ...