Observation Strategies . For broad band filters the sky background will limit the detection of faint targets. ... See Table 6.3 on page 113 for sky level as function of ecliptic coordinates.) If these higher sky levels would severely impact the science data, observers should consider specifying the special requirement LOW-SKY on the Phase II proposal. ... Scattering of bright Earth light in the OTA can produce non-uniformities in the background which may hamper analysis of faint target images. ...

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• Sky Background
• Chapter 7:  Observation Strategies
• Chapter 7: Observation Strategies

... The J, H and K bands are characterized by a bright background, such a background is mainly due to the emission of atmospheric lines and of thermal radiation. ... If the source cover a large fraction of the slit, spectra off-source must be observed to adequately sample the sky background. ... The on chip integration time (time spent in each position of the slit) must not exceed 40 seconds in J and H bands and 60 seconds in K band. ... We suggest a sequence of 10 for each elementary integration time. ...

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• Observing capabilities
• IBIS: SolarNet Access
• Cannibal Stars Cause Giant Explosions in Fornax Cluster Galaxy (ESO Press

... A1 centered at 2500 angstroms with a width of 1200 angstroms . ... UGC 6151 is a Low Surface Brightness Galaxy which is at the center of the first deep survey field taken with UIT. The total exposure time was 1370 seconds out of a planned 2000 through the A1 filter. ... The galaxy has very faint outer spiral structure and tightly wound inner spiral structure. The outer spiral structure should be more prominent at UV wavelengths if star formation is occurring out there. ...

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• Galaxy Gallery Page III

... 11 Yellow-Green (78% transmission): Contrasts well with the red and blue characteristics of surface features on Jupiter and Saturn. ... 82A Light Blue (73% transmission): Useful on the Moon, Mars, Jupiter, and Saturn, this subtle pale blue filter enhances areas of low contrast while avoiding significant reduction of overall image brightness. ... Meade Series 4000 Photo-Visual Color Filters may be ordered individually or in the following sets: . ... Meade Series 4000 Broadband Nebular Filters . ...

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• Meade Series 4000 Broadband Nebular Filters
• Meade Series 4000 #905 Variable Polarizing Filter (1.25")
• Meade Series 4000 Moon Filter: ND96

XMM-Newton OM Response Files Page . ... Data Analysis SAS News What is SAS? ... The response files have the name om_effarea_<filter>_v2.0.rsp. The response files should be used in conjunction with a spectral data file containing the filter count rate. Such a data file may be created by editing the template filter file om_filter_default.pi with a fits editor such as 'fv' and changing the "RATE" and "STAT_ERR" entries in the SPECTRUM extension to the filter count rate and error. ...

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• pn Filter Wheel Closed Data
• Proposal change classes
• XMM-Newton Current Calibration File: Updates

Next: AXAF Recipes Up: ROSAT HRI Recipes Previous: Quantum Efficiency Correction (a.k.a. For some observations, a significant amount of data may have been rejected during SASS processing because the background level was higher than the calculated threshold for rejection. ... REJECTED EVENTS . ... The recipe will allow the user to include rejected events in the generation of a new qpoe file and filter on the background level. ... This creates a qpoe file with standard + rejected events. ...

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• Champlane Observation: CTIO 4m/MosaicII June 22-23, 2009
• Chandra Images for SNR J0537.8-6910
• Period Determination

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Australia Telescope Online Archive (ATOA) . ... Parkes | ... Australia Telescope 20GHz Survey . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ...

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• PPTA Wiki | Main / Observing
• Pre- and Post-Correlation filters
• The high quality H interference filter

adapted from Observe: Eclipses, published in 1979 by the Astronomical League and "Safe Solar Filters," by B. Ralph Chou, Sky and Telescope, August 1981) . ... Tape TWO pieces of film together into a sandwich, and tape this over the opening in the cardboard. ... The cardboard frame will act as a shade from the bright Sun, while you safely observe through the film sandwich. ... Undeveloped film is not safe. ... tape . ... At the end of one of the tubes, tape the aluminum foil, and make a tiny pinhole. ...

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• ASP: Guest Observer
• ASP: Star Science in the Autumn Sky
• ASP: Beacons in the Gloom

... The R , I photometric observations of SBS 0335-052W were obtained occasionally during the study of SBS 0335-052 with the 3.5m telescope in Calar Alto on 1991 October 6. ... Aperture photometry was performed on the standard star observations using MAGNITUDE/CIRCLE task with the same aperture for all stars. ... For photometry of extended objects, we used the package SURFPHOT as well as dedicated software for adaptive filtering developed at the Astrophysical Institute of Potsdam (Lorenz et al. ...

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• Getting the observations
• Individual data
• Optical spectroscopy

... Tonight's Sky . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... solar system . galaxies . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Imaging Basics . ... Observing Basics . ... Observing Basics: Visual Solar Filters . ... Expand your observing at Astronomy.com . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

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• How do light pollution filters work? Do they actually help? | Astronomy.com
• Maximize a minimum filter | Astronomy.com
• Bright planets meet at dusk | Astronomy.com

... Science Users Information > Observing with ESO Telescopes > Phase 2 Preparation > Observing conditions . ... Service Mode Philosophy . ... The following definitions of the observing conditions are common between Phase 1 preparation and Phase 2 preparation, as well as between Service Mode and Visitor Mode observations. ... There are additional Service Mode Policies and Service Mode Guidelines regarding the observing conditions. ... Seeing (Phase 1) and Image quality (Phase2) constraints . ... Moon . ...

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• Home page WG on calibrators
• Observing list preparation
• ESO - Phase 2 Observing Preparation . for ESO telescopes

In 2007-2008, the planet Uranus will reach one of its annual equinoxes for the first time since 1966. As a consequence, its five major satellites orbiting in the equatorial plane will undergo a season of mutual eclipses and occultations very similar to the one that Jupiter's Galilean satellites undergo every 6 years. ... Some of these events occur when Uranus is at conjunction, or the satellite is transiting or too close to the limb of the planet. ... Complete table of events . ...

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• HISTORICAL BACKGROUND
• Historical Background
• Observations with the Faulkes Telescopes

... Up: Proposal Processing . ... ESO is prototyping a distributed ``Phase II'' system that will allow astronomers to prepare their observations at their home institutions, while maintaining a central repository for all observation data. ... ESO is developing a Phase II Proposal Preparation system (P2PP) to collect detailed scientific programme descriptions, in the form of observation blocks (OB). ... ESO's Phase II Proposal Preparation system is an integral part of the VLT Data Flow System (DFS). ...

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• A User Friendly Planning and Scheduling Tool for SOHO/LASCO-EIT
• Towards Optimal Analysis of HST Crowded Stellar Fields
• ADASS 2002 Conference Proceedings

Proposal Identification No.: A2031 Date Received: 2004 ­Oct­04 15:24:54 Technical Page Proposal Type: Regular General Category: Astronomy Sub­Category: Spectroscopy Observation Category: Solar System Total Time Requested: 50 Hours Proposal Title: OH Observations of Comets in 2005: Including Deep Impact Mission Target 9P/Tempel 1 ABSTRACT: As part of a continuing e#ort to observe the 18­cm OH lines in comets we propose to observe 9P/Tempel 1 and C/2003 T4 LINEAR in spring 2005. ...

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• Spectral-Line Observing
• RF observing program
• INTRODUCTION to Spectral Line Observing at AO

Home . ... Observing . Exposure Time Calculator (ETC) . Survey processing . ... ESO - Public Surveys . near IR surveys . ... Exposure Time Calculator . ... Survey Area Definition Tool . Recommended values for Detector Integration Time (DIT) . ... Detector Properties . ... Filter properties . ... ESO ][ VISTA Home ] ...

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• VISTA - Visible and Infrared Survey Telescope for Astronomy
• VISTA ETC - Exposure Time Calculator

... Virtually all detectors and telesco pes are sensitive to only a particular range of frequencies or wavelengths. ... Flux per unit wavelength or frequency So in practice, when we measure how much radiation we receive from some object, we usually mean the energy at some particular frequency, not the integral of the energy over all frequencies (which would be the bolometric brightness). ... But imaging data at UV, optical and IR wavelengths often uses a different approach: broad-band imaging. ...

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• http://www.mso.anu.edu.au/pfrancis/ObsTech/TutEx1.pdf
• Siding Spring Survey Follow-up Obs
• Observational Techniques: Assignment 1

... The Galactic low-mass X-ray binary GS 2023+338 was discovered during the burst on May 22, 1989 with the Japanise satellite Ginga (aka Galaxy). The flux reached 17 crabs (this unit of flux measurement is an bright X-ray source, Crab Nebula) at 10-35 keV. ... No other radio telescope worldwide carried out multi-frequency measurements. ... Upon 14 days the radio flux fell below the detection level at the RATAN-600 in relation to the decrease of the X-ray flux. ...

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• GRB090726
• RCJ0311+0507

Peremennye Zvezdy", . ... System . ... Find.Chart . ... GSC 01137-00293 . ... The system 2MASS J22514830+1532034 (indicated as V in the finding chart) is situated in the field of view of the known variable stars BG Peg and BH Peg. ... MaxI MinI = 0.34 mag and MaxI MinII = 0.33 mag in B filter. ... The system GSC 01137-00293 (indicated as V in the finding chart) is situated in the field of view of the known variable star AT Peg. ... MaxI Min.I = 0.06 mag and MaxI MinII = 0.04 mag in B filter. ...

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• XWare > APOD

m31 _B_00098_df.fits TARGET = ' M31 ' / target EXPTIME = 100 . / exposure time (seconds) FILTER = ' (2) B (375-490)' / filter DATE-OBS = ' 2012-11-22T00 :40:42.618' / date of observation (UT) m31 _B_00099_df.fits TARGET = ' M31 ' / target EXPTIME = 100 . / exposure time (seconds) FILTER = ' (2) B (375-490)' / filter DATE-OBS = ' ...

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• http://www.astro.louisville.edu/shared_skies/archive/select/ngc/ngc104_47tuc/20101004/log.txt
• http://www.astro.louisville.edu/shared_skies/archive/select/ngc/ngc6888_crescent/20121121/log.txt
• http://www.astro.louisville.edu/shared_skies/archive/select/messier/m33/20121121/log.txt

... The following charts/text are intended as tools for monitoring the Type Ia supernovae ( SNe ) event visually or photographically (utilizing telescope equipped CCD equipment).The files include: A replication of The Type Ia SNe , V- magnitude (with data point checks from other cited references)and color index (B-V) templete (to indicate a general color-related trend of the type Ia ... I believe this might help alleviate some of the problems involving the making of acceptable amateur light curves...

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• Statistics from S. Pesci and P. Mazza logbook.
• Contributions by amateurs: SN1996bk.