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1. http://www.stsci.edu/documents/dhb/webvol2/c17_hsperror.fm10.html
... HSP photometric accuracies are strongly dependent on the observational setup and observing conditions, such as spacecraft jitter. Absolute photometry can be done only with a one sigma limiting accuracy of approximately 5%, but relative photometry is possible with an accuracy of 1-2%. Estimated HSP Calibration Accuracies . Absolute Timing . ... Relative Timing . ... 1991 through summer 1993 monotonic decrease, . ... Absolute photometry . ... 5% (one sigma) . ... Relative photometry . ...
[ Сохраненная копия ]  Ссылки http://www.stsci.edu/documents/dhb/webvol2/c17_hsperror.fm10.html -- 4.8 Кб -- 10.02.1998
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2. BL Lacs
... The BL Lac objects found within DXRBS fall mostly in the range . ... A large fraction of the BL Lacs so far in our sample are at L X / L R < 10 -6.5 , the region of Figure 6 populated by LBLs. In this region of parameter space (to the left of the left-most dashed line in Figure 6), DXRBS includes objects up to two orders of magnitude fainter than the 1 Jy survey. ... For comparison, we have plotted the values for members of these three ROSAT-based surveys (DXRBS, HQS/RASS and RC) in Figure 7. ...
[ Сохраненная копия ]  Ссылки http://www.eso.org/~ppadovan/survey/dxrbs_paper/node15.html -- 10.3 Кб -- 03.12.2003
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3. Performances of NICS
The overall efficiency (including atmospheric transmission, reflectivity of the telescope mirrors and overall efficiency of the optics and of the detector) for broad-band imaging should be about 25% in H and K, and about 15% in J. The main noise source for both broad- and narrow-band imaging should be the photon noise associated to the background+source flux. ... Flat fielding (and possibly background subtraction) might increase the noise by a factor 2 ? ...
[ Сохраненная копия ]  Ссылки http://www.arcetri.astro.it/irlab/instr/nics/generale/prest.html -- 3.8 Кб -- 28.07.2005
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4. beam_repair_2010
... 17mar10: allowable za range, tiedown tensions for mar10 . ... We have at least 20 kips of td tension on each corner . ... A constraint for our pointing model is that the carriage house is at stow (8.835 degrees). ... Bottom: With the dome at za=8.4, the carriage house can travel from 0 to 20 degrees za and stay within the 3000 kip-feet limit. ... run the dome from 6 to 10 degrees za with the carriage house at stow (8.835). run the ch from 0 to 20 degrees with the dome at 8.4 degrees za. ... dome . ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/~phil/hardware/telescope/beam_repair_2010.html -- 13.4 Кб -- 01.05.2010
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5. Album: Limited dynamic range demostrations
. Album : asv-album :: Technical photos :: a80tests ::Limited dynamic range demostrations . Up . IMG 0308 . IMG 0309 . IMG 0396 . IMG 0397 . IMG 0398 . IMG 0399 . Album created by album script a script by David Ljung on Mon Jan 19 20:23:14 2015 .
[ Сохраненная копия ]  Ссылки http://crydee.sai.msu.ru/album/tech/a80tests/dynamic_range/index.html -- 12.8 Кб -- 19.01.2015
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6. Influencing the plan
... The program will propose reasonable default choices, and will provide some approximate estimates of the magnitudes where photon noise becomes excessive, and where photon and scintillation noise are comparable. ... Table shows what a typical crossover table looks like. ... We would generally prefer to have the extinction measurements limited only by scintillation noise, so the initial faint limit for extinction stars is set 1.5 magnitudes brighter than the brightest of the crossover values. ...
[ Сохраненная копия ]  Ссылки http://www.sao.ru/precise/Midas_doc/doc/94NOV/vol2/node281.html -- 11.8 Кб -- 23.02.1996
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7. Sensitivity Limits
... ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Astrophysics graduate student programs . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... In general it is expected that the overall sensitivity limit will be imposed by the readout noise from the science detector, even given that coherent `blind' integration is possible. ...
[ Сохраненная копия ]  Ссылки http://www.atnf.csiro.au/pasa/14_2/robertson/paper/node5.html -- 52.2 Кб -- 08.04.2016
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8. Limits on Phase Correction Performance Due to Differences Between Astronomical
... Bojan Nikolic web pages (r. 329) . ... Using high-resolution three-dimensional realisations of turbulent fields, we investigate the limits on achievable performance of atmospheric phase correction using water-vapour radiometers arising from following effects: the incoherent measurement of power from water by the radiometers (in contrast to coherent detection of the astronomical signal); the different tapers of the response patterns of the astronomical and radiometer receivers; and, the ...
[ Сохраненная копия ]  Ссылки http://www.mrao.cam.ac.uk/~bn204/alma/memo573.html -- 11.0 Кб -- 04.04.2016
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9. ADASS 2002 Conference Proceedings
... Using a simple 2-D Gaussian Point Spread Function (PSF) on a constant (flat) sky background, I derive a theoretical photometric and astrometric performance model for analytical and digital PSF-fitting stellar photometry. ... The photometric performance is maximized when either the effective background area or the effective-background-level measurement error is minimized. ... An important, but frequently ignored, noise source is the uncertainty of the measurement of the effective background level ( )...
[ Сохраненная копия ]  Ссылки http://www.adass.org/adass/proceedings/adass02/P4-2/ -- 25.4 Кб -- 12.03.2003
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10. ARC 3.5m | Closure Conditions
... ARC 3.5m | Weather Closure Conditions . The enclosure will be closed by the Observing Specialist under the following conditions. ... This policy will be consulted whenever there are questions or disagreements concerning closure of the APO 3.5-meter telescope due to hazardous conditions or situations, at times when telescope operations are being overseen by an APO Observing Specialist. ... the on-duty Observing Specialist has full responsibility, and sole authority, to make this decision. ...
[ Сохраненная копия ]  Ссылки http://www.apo.nmsu.edu/arc35m/closure_conditions.htm -- 9.2 Кб -- 19.03.2014
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