System Throughput and SNR / Exposure Time Estimation . ... Figure 6.11 shows the photometric monitoring data for the standard star GRW+70D5824 (a white dwarf classified DA3; B-V = -0.09) in the WF3 and PC1 for the set of filters which are routinely monitored. ... Figure 6.12 shows the throughput decline in all four chips as a function of days since the last decontamination for the F170W filter. ... Figure 6.12: - Throughput for the F170W Filter Following Decontaminations. ... Time. ...

... Bad Astronomy . ... I think I will break from my usual format of Bad Astronomy/ Good Astronomy by saying that the way we define seasons currently is not strictly bad, but I feel (in my opinion!) that it could be better. The definition of when the seasons begin is at the moment of solstice or equinox; that is, winter (in the north) starts on December 22 nd and summer starts on June 22 nd . ... Now imagine breaking up the Sun's 46 degree up-and-down yearly swing into 1 day intervals. ...

... XMM-Newton SOC Home Page Conferences & Meetings . ... Data Analysis SAS News What is SAS? How to use SAS SAS Workshops SAS Version Changes Download and Install SAS Science Simulator (SciSim) . ... EPIC cameras optical loading . ... The PI is invited to cross-check the expected X-ray flux from the target source (and from any other potentially bright source in the target field of view), or to provide the SOC with her/his own estimate, if not originally specified in the proposal. ...

... Monthly plots: . ... Plots of wind during storms: . ... It stores the date, wind velocity, and wind direction. ... The wind meter is often offline/disconnected while the computer continues to log the data. ... The monthly average wind velocity versus wind direction. ... 02sep10: for 7 day plots switched from median to mean for direction data. 31aug10: wind meter direction reset. 29may09: wind meter disconnected to test distomat. jun08: wind meter reinstalled. jorge installs new version of program. ...

... Gravity data reflect changes, related to the groundwater redistribution, ice melting, and precipitation accumulation. ... We apply Multichannel Singular Spectrum Analysis (MSSA, or extended EOF) technique to filter GRACE data and separate the principal components (PCs) of different periods. We performed data averaging over the large river basins of Russia. ... Fig 1. ... MSSA is a promising method for GRACE data processing, de-striping, filtering, and Principal Components (PCs) separation. ...

... Phase Diversity Imaging: Real Time Correction of the Atmosphere and Telescope . Dr. Robert A. Gonsalves . ... Join us this month for what promises to be an engaging talk by Dr. Robert A. Gonsalves, “Phase Diversity Imaging: Real Time Correction of the Atmosphere and Telescope.” Phase diversity imaging uses multiple images of an object to combat the deleterious effect of the changes in the atmosphere and telescope. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

Is the ozone layer recovering ? ... Global Regulation Global Regulation · · · · 1985: Vienna Convention 1987: Montreal Protocol Several amendments and adjustments Quantity for (chemical) ozone depletion of ODS: EESC (Equivalent Effective qu ect Stratospheric Chlorine): Weighting over release and ozone depletion of individual ODS EESC for mid-latitudes http//:www.wmo.ch/web/arep/reports/ozone_2002/q&as.pdf, Seite Q.29 1980 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100 3. ...

... enabled for phoenix v2, MCALIB production . ... supporting MASTER/SLAVE model (MUSE) . ... upload to qcweb (monitor/FINISHED); on SLAVE accounts, also scp to MASTER . ... The monthly output pages list only the SCIENCE ABs (if for IDPs) or only the processed CALIB ABs. ... YES . ... YES|NO (NO); if YES, the tool checks for the marker PROCESSED_SLAVE in $DFO_SCI_DIR and thereby recognizes data content as coming from the SLAVE account (which is then marked by dark square). ... PROC_INSTRUMENT . ... ABS...

Astronomy Picture of the Day . Three Month Composite of Comet Holmes . ... 5.02.2008 . ... Since brightening unexpectedly by nearly one million fold in late October, the last three months have found the coma of Comet 17P/Holmes both expanding and fading. This spectacular composite image shows how the coma and tail of Comet Holmes have changed. ... The extent of the coma currently makes Comet Holmes over five times the physical size of our Sun. ... Publications with keywords: comet . ...

Posting Observations . ... You will need to subscribe to vsnet-acc (to allow you access to post your observations). ... VSNet has several different e-mail sigs, and sub sigs. ... These list are controlled by a software package called " Majordomo ", which allows you to subscribe and unsubscribe yourself from these list with an e-mail message (automated). ... Once you have subscribed to vsnet-acc (which will only send you a welcome message back and nothing else) you can post to the other list. ...

... Tonight's Sky . ... The Magazine . News . Observing . ... Community . ... Sky this Month . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... Astronomy for Kids . ... The Sky this Month . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... 8, ``Celestial Mechanics'', 2002 Station coordinates from observations of DORIS system TOPEX/Poseidon satellite M. V. Vasiliev, E. I. Yagudina Institute of Applied Astronomy, St. Petersburg, Russia The satellite system DORIS (Doppler Orbitography and Radiopositioning In­ tegrated by Satellites System) is the effective means of space geodesy and geody­ namics. ... Along with SLR, GPS observations of DORIS system are used also for EOP parameters de­ termination. ...

. To sort a file in dictionary order: sort -d +1 -2names > orders . Lines in the file names are sorted on field 2 into dictionary order and the result placed in the file orders . To sort a file in month order: sort -M +2 -3 -o breakdown orders . Lines in the file orders are sorted on field 3 into month order and the result placed in the file breakdown .

... a) assembling and tuning of printing-circuit boards for the Test-set device and assembling of the Test-set device itself; . ... Engineering models of the On-board Rubidium Frequency Standard (ORFS-SRT) and Space Radio Telescope On-board Heterodyne and Clock Frequencies Synthesizer set (OHCFS-SRT) were packed and delivered to LA to be assembled with the SRT in the Device Container. ... FC                  Focal Container – hermetic package with the scientific payload; it contains receivers, . ...

... 2008 February 5 . Three Month Composite of Comet Holmes . ... Explanation: How has Comet Holmes changed? Since brightening unexpectedly by nearly one million fold in late October, the last three months have found the coma of Comet 17P/Holmes both expanding and fading. This spectacular composite image shows how the coma and tail of Comet Holmes have changed. ... The extent of the coma currently makes Comet Holmes over five times the physical size of our Sun. ... About APOD | ...

... With this adjustment, the largest three-month range occurs in February-April and is 71 њF. The range for all year, still removing the January 1962 record low, is 88 њF. The expansion coefficient for aluminum alloy 6061 is 24.3 microns/m-њC while that for borosilicate glass E6 is 2.8 microns/m-њC. The expansion coefficient difference is 21.5 microns/m-њC. Combining this number with the scale factor equation from the previous section gives a coefficient of 0.207 mm/њC for primary motion. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Monthly Sky Notes . ... Posted on April 6, 2016 | No Comments Spring has truly sprung. ... Continue Reading.. Posted on March 1, 2016 | No Comments See you later February, youтАЩve been a wonderful month, but now it is time to welcome March. ... Posted on February 2, 2016 | ... Posted on January 7, 2016 | ... Posted on December 3, 2015 | ... Posted on November 4, 2015 | ... Posted on October 5, 2015 | ... Posted on September 3, 2015 | ...

... We continue multicolor photometric CCD UBVRI monitoring of the peculiar red nova V838 Mon using CCD photometer and SAO RAS 1-m reflector . ... To understand these changes, one should take into account that before the explosion in 2002, V838 Mon was a system containing two B3V type stars, and brighter companion exploded. ... In the season of 2007-2008, B3V companion was captured by expanding remnant, but its variable radiation leaked through the cloudy structure of the remnant's envelope. ... 2008) ....

... EXPNO SOURCE FRQ Corr DOY DY: DATE UT RANGE #TEL TELESCOPES VS04h J1218-46 C Pent 32 Su:Feb-01 19:30 - 02:00 3 HH MP CD VS02x J1512-09 C Pent 33 Mo:Feb-02 21:00 - 02:00 3 KA MP CD VS02b J1613+34 C Mitk 35 We:Feb-04 19:00 - 04:00 5 UD NT KA MP TR VS02r J1550+05 C Pent 36 Th:Feb-05 19:00 - 00:00 3 UD KA MP VS07f J1727+45 C Mitk 37 Fr:Feb-06 20:00 - 01:00 4 KA MP TR CD V030p2 1624+416 C Socr 38 Sa:Feb-07 05:00 - 09:00 9 VLBA HALCA SAFE HOLD V140b4 CEN-A C ...

... Kieran Hickey of Armagh Observatory has been testing the link between increased temperatures in North-West Europe and the frequency of storms, as shown in the historical records of climate at Armagh and elsewhere. This is part of an on-going research project at Armagh into the nature of climate change in North-West Europe using long-term meteorological records. ... Some years have significantly more winter storms than others, possibly as a result of the North Atlantic Climate "Seesaw". ...