... 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. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2009 September 8 . Unexpected Impact on Jupiter . ... Explanation: Two months ago, something unexpected hit Jupiter. First discovered by an amateur astronomer Anthony Wesley on 2009 July 19, the impact was quickly confirmed and even imaged by the Hubble Space Telescope during the next week. ... About APOD | ...

... These are ``quirks'' rather than ``bugs''. Below is a list of quirks. When loading a file and ``Reset Intensity Upon File Load'' is disabled, the intensity range of the previous image will be used. ... When moving between two images (such as when blinking, or when loading a new image), the display system attempts to retain the old image parameters (i.e. zoom box). What is retained are the corners of the zoom box measured in image pixel co-ordinates, not world co-ordinates. ...

Next: Analysis in the Up: MIDAS utilities for Previous: Fourier analysis . For the detection of smooth signals, e.g. sinusoids, use either SCARGLE/TSA or AOV/TSA with bins. ... SCARGLE/TSA -- . Scargle sine model: This command computes Scargle's (1982) periodogram for unevenly spaced observations x . ... In this way, the command can be used to perform a CLEAN-like analysis manually by removing individual oscillations one by one in the time domain (see Roberts et al. ... AOV/TSA -- . ...

... We have been using it to analyze PC images of known gravitational lenses and QSOs which are candidates for lensing (Falco 1993). ... Fig. 1 plots the higher contours of the PC image of 0142 in the upper left, and its power spectrum in the upper right. ... If we fit the envelope of the power spectrum with a binary model, we find that best fit gives a separation of the two components of 1.3 PC pixels or about 58 mas. ... The lower two curves are cuts through the 0142 power spectrum. ...

... 2000 March 12 . 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 over the past few years have been interpreted as indicating that we live in a previously unexpected universe . ... About APOD | ...

Next: Coordinate Systems Up: IRAF/PROS Previous: Other Types of Files . A few new features and enhancements to the standard IRAF system have been introduced with the PROS software: . ... Default compound extensions are used by the PROS tasks when no extension is given for the output file name. Most PROS tasks allow the output file name to be defaulted, with the convention that the output file name will be composed of the input `root' name, plus the default extension specific to the task. ...

... S.P. KOROLEV ROCKET AND SPACE CORPORATION ENERGIA . ... OAO RSC "Energia" . ... Company's History . ... History . ... ISS Russian Segment . ... ISS 45/46 . ... check for the following onboard the ISS RS: a capability to demonstrate the action of physical laws of dynamics of reactive and gyroscopic forces on ellipsoid (Letauschaya Tarelka device) rotating in the unsupported medium in microgravity, with video record of its behavior in the station module; . ... 2015 JSC "S.P. Korolev RSC "Energia" . ...

Astronomy Picture of the Day . Unexpected Impact on Jupiter . ... 8.09.2009 . ... First discovered by an amateur astronomer Anthony Wesley on 2009 July 19, the impact was quickly confirmed and even imaged by the Hubble Space Telescope the very next day. ... It is now thought that a small comet -- perhaps less than one kilometer across -- impacted Jupiter on or before 2009 July 19. ... July . ... Publications with keywords: Jupiter - impact . Publications with words: Jupiter - impact . ...

... 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. ...

... The door of the control box was "open" in one case, and "closed" in the other. For this to be a meaningful test, the ALFA feeds were uncovered (to allow sampling of the possible interference), but the array was deliberately not kept at the focus (to reduce possible confusion from sky contribution as well as the usually expected RFI at L-band). ... The left and bottom panels show average spectrum (black), auto/cross-correlation for pairs at the same frequency (green) and the efficiency (blue). ...

Looking for Galactic foregrounds and CMB polarization with SPOrt Marco Tucci et al. ... Thanks to simulations of SPOrt's performance and of the astrophysical and cosmological scenario, we analyse its capability of recovering po- larized sky maps with suitable destriping techniques. We also discuss the expected Galactic foreground angular spectra, in par- ticular by computing the synchrotron spectra at lower frequencies; and the problem of foreground separation in the cosmological win- dow. ...

Astronomy Discussion Forums . ... I Expected More Sense Than That. ... Post Message | ... Posted by Richard D. Stafford, Ph.D. on November 8, 2002 04:14:05 UTC . ... You are missing the point - harvey1 - November 8, 2002 - 13:10 UTC . I hope Stafford doesn't mind my intruding his forum - mrsouza - November 8, 2002 - 14:55 UTC . ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Dead time corrections are not considered explicitly in the current version of this task, as it is expected that the EXPOSURE attribute, written to the spectral file by evselect (see also Julian Osborne's proposal regarding exposure-type attributes available on the SOC web server), should take into account dead time effects. arfgen calls the task attcalc internally. ... Note that the intermediate event dataset also contains attributes used to initialise the CAL in the subsequent call by attcalc . ...

In the PROJECT we are using the following peculiar . features of RATAN-600 . ... Brightness temperature sensitivity being equal to the antenna temperature sensitivity .. ... Receiver system .. ... Using aperture averaging effect. dual- beam and dual (multi-) frequency filtration, we demonstrated full filtration of the atmosphere noise down to the receiver noise at all scales of acoustics peaks ( Fig.1 , Fig 2 ). ... We select this frequency as the central one in our project. ... Antenna surface . ...

The Russian Parliament will soon consider a bill that would restructure the Russian space program, 35 years after the launch оf Sputnik. ... But the legislation's most striking and controversial feature is a provision that would ban testing and deployment оf space weapons ? including anti-satellite weapons and space-based missile interceptors. ... A draft bill was written by a group of experts within the Moscow Space Club, several of whom now work on space issues with the Russian Parliament. ...

October 14, 2006 ---------------- Version 3.1 ----------- As of this version, XmTel is considered stable for routine use. and it is useful for the control of telescopes for both amateur and professional uses. ... XmTel does not yet include the suite of pointing corrections that are already in the menu system (but disabled). ... With the offset correction a well-aligned small telescope will point to arc minute accuracy and well enough to put an object in a CCD camera field of view. ...

Next: A New Entropy Measure Based on Multiple Resolution and Noise Modeling . ... The entropy measurement has been proposed for image restoration several years ago in astronomy. ... The multiscale entropy has the advantage to introduce a noise modeling, and the concept of information at different level of resolution. ... We show in this paper that it can also be used for background fluctuations analysis. ... Five simulated images were created by adding 400, 200, 100, 50, 0 sources to a noisy image. ...

... Ж.Ф. Родионова, А.А.Карлов, Т.П. Скобелева и др. ... Sternberg State Astronomical Institute, 119899, Moscow, Russia; jeanna@sai.msu ru. ... Moscow State University, Vorobjovy Gory, 119899, Moscow, Russia. Brown University - Vernadsky Institute Microsymposium 34, October 8-9, 2001, Moscow, Russia . ... Rodionova J1., ... Sternberg State Astronomical Institute, Moscow University, jeanna@sai.msu.ru . ... 1 Sternberg State Astronomical Institute Lomonosov Moscow University, Russia; marss8@mail.ru . ...

... I.A.Dynnikov, Three-page approach to knot theory. ... Universal semigroup, Funktsional'nyi Analiz I Prilozhenija, 34 (2000), no.1, 29-40 (Russian); English translation in Functional Analysis and Its Appl. 34 (2000), no.1, 24-32. I.A.Dynnikov, Finitely presented groups and semigroups in knot theory. ... Math. 2000, no. ... English translation: Russian Math. ... A.Vershik, Numerical invariants of exponential groups, and a locally free approximation of braid groups (in Russian), Zapiski Nauchn. ...