Поиск по:www.stsci.edu -
Поискать по всем серверам
На этой странице приведены все страницы сервера www.stsci.edu ,которые мы индексируем. Показаны документы 441 - 460 из 36095.
Упорядочить по:
URL
|
дате изменения
441. COS/FUV Lifetime Position 3 Line Spread Functions and Cross-dispersion Spread
... COS/FUV Lifetime Position 3 Line Spread Functions and Cross-dispersion Spread Functions now available on the COS website . ... Line Spread Functions (LSF), which describe the one-dimensional line profile of an infinitely narrow spectral line from a point source, and Cross-dispersion Spread Functions (CDSF), which describe the cross-dispersion profile of a point source on the detector, are now available on the COS website (see http://www.stsci.edu/hst/cos/performance/spectral_resolution ). ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2016_03/lp3_lsf_cdsf_release -- 20.8 Кб -- 12.04.2016
Похожие документы
Похожие документы
442. New ETC Release (20.2)
... New ETC Release (20.2) . ... Data . ... HST Overview . ... FUV HV History . ... COS Data Handbook . ... As part of the ETC 20.2 release, the included COS and STIS throughputs have been updated to provide our best estimates for Cycle 20. ... Comparing the ETC 20.1.1 and 20.2 predictions for April 2013, the STIS NUV dark rate has decreased by 30%, the COS NUV dark rate has increased by 11%, and the FUV dark rates (for both spectroscopic and spectroscopic target acquisition modes) have increased by 130...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2012_06/new_etc_release.html -- 21.3 Кб -- 12.04.2016
Похожие документы
Похожие документы
443. Common Mistakes that Can Ruin Your Data and Your Program
... HST . ... Data . ... HST Overview . ... Phase I Proposing . ... DD Time . ... Retrieving HST Data . ... Astronomer's Proposal Tool . ... Observers are reminded that BUFFER TIME values need to be provided in the Phase II proposal. An incorrect computation of the BUFFER TIME can lead to partial or, sometimes, significant loss of data. ... The value returned by the ETC should always be compared against the exposure time as well as the source count rates in order to avoid data gaps and/or data loss. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2012_02/common_mistakes.html -- 21.8 Кб -- 12.04.2016
Похожие документы
Похожие документы
444. New ETC Release: Changes in the FUV sensitivity and new throughput curves
... New ETC Release: Changes in the FUV sensitivity and new throughput curves . ... HST Overview . ... Cycle 24 Announcement . ... A new version of the ETC (20.1.1) was released on January 26, 2012. ... The new throughputs are projected to January 1, 2013. ... While there has been no change in the slope of the sensitivity decline, which is ~11% per year, this throughput had not been updated in the last two years, leading to exposure times that would be underestimated by ~25% by the middle of Cycle 20. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2012_02/new_etc_release.html -- 19.4 Кб -- 12.04.2016
Похожие документы
Похожие документы
445. Pixel-based CTI Corrections for STIS CCD Data
... HST . ... HST Overview . ... Phase I Proposing . ... Retrieving HST Data . ... The COS/STIS team at STScI has created a stand-alone automated script to apply Charge Transfer Inefficiency (CTI) corrections to STIS CCD data. ... The script (version 1.0) uses a pixel-based correction algorithm and runs in Python. The script automatically generates CTI corrected dark reference files, applies CTI corrections to the science data, and outputs the usual CALSTIS products with CTI corrections applied. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2015_09_STIS/cti_correction -- 18.9 Кб -- 12.04.2016
Похожие документы
Похожие документы
446. Observing Background Limited Targets with the STIS FUV MAMA and the COS FUV XDL
... Detectors . ... Observing Strategy . ... Observing Background Limited Targets with the STIS FUV MAMA . For the STIS FUV MAMA the current version of the Exposure Time Calculator (ETC) adopts a uniform detector background rate of 1.5e-4 counts/pixel/second (c/p/s). ... When the FUV MAMA HV is first ramped up for the day, the initial detector background is only about 1e-5 c/p/s, a factor of ~15 lower than the canonical number. ... Observing Background Limited Targets with the COS FUV XDL . ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2015_03/bkg_limited_targets -- 27.8 Кб -- 12.04.2016
Похожие документы
Похожие документы
447. Exposure Time and S/N calculated by the ETC for the G130M/1055 and G130M/1096
... Exposure Time and S/N calculated by the ETC for the G130M/1055 and G130M/1096 Settings are NOT correct . ... HST Overview . Overview . ... DD Time . ... ETC . ... The focus of the G130M/1055 and G130M/1096 settings were recently adjusted to increase their resolution. ... Because of these two changes, exposure times may be underestimated by as much as a factor of 4, and S/N may be overestimated by as much as a factor of 2. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2012_12/ETC_correction.html -- 19.1 Кб -- 12.04.2016
Похожие документы
Похожие документы
448. CTE Correction
... HST . ... Data . ... HST Overview . ... The STIS CCD is a 1024 X 1024 pixel, thinned, backside illuminated SITe CCD, with sensitivity from below 2000 е up to about 11000 е. In a space environment, CCD detectors accumulate radiation damage, which over time leads to increasing dark current, more hot pixels, and reduced charge transfer efficiency. ... The Charge Transfer Efficiency (CTE) measures the fraction of the charge in a given pixel that is transferred to the next row during the readout. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2012_06/CTE_correction.html -- 21.3 Кб -- 12.04.2016
Похожие документы
Похожие документы
449. January 2016 STAN
... HST . ... Data . ... HST Overview . ... Reference Files . ... COS Data Handbook . ... A new version of CalCOS, version 3.1, has been installed in the operational pipeline and the available cache of COS data has been reprocessed with the latest version. ... This new version includes minor bug fixes from CalCOS 3.0, the addition of a new reference file, and code changes to handle localized transient events in FUV data. ... See the COS Data Handbook for more information on the COS extraction methods. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2016_01/calcos_3.1_release -- 20.9 Кб -- 12.04.2016
Похожие документы
Похожие документы
450. New High Contrast Coronagraphic locations for STIS provide inner working angles
... New High Contrast Coronagraphic locations for STIS provide inner working angles of ~0.2" . ... News and . ... The smallest of these supported positions is at WEDGEA0.6, corresponding to an inner working angle of ~0.3". ... These new positions allow high contrast imaging at a minimum inner working angle of 0.15", with demonstrated performance to ~0.2"--roughly 3 lambda/D, and close to a factor of two better than WEDGEA0.6. ... http://www.stsci.edu/hst/stis/strategies/pushing/coronagraphic_bars . ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2014_03/bent_finger_corona -- 19.5 Кб -- 12.04.2016
Похожие документы
Похожие документы
451. Change to COS FUV Pulse Height Filtering to Lower the Observed Dark Rate
... Change to COS FUV Pulse Height Filtering to Lower the Observed Dark Rate . ... Changing Programs & Resolving Problems . ... FUV HV History . ... 99% of source counts while removing approximately 20% of the observed dark counts. The actual amount of the dark rate reduction depends on the PHD of the dark counts in each observation, which varies between observations and with solar cycle activity. Because of the incredibly low dark rate on COS, the effect on most observations is very small. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2012_12/phatab_change.html -- 18.9 Кб -- 12.04.2016
Похожие документы
Похожие документы
452. CalCOS v2.15.4 Installed in OPUS
... HST . CalCOS v2.15.4 Installed in OPUS . ... Data . ... HST Peer Review Process . ... HST Overview . ... Phase I Proposing . ... Cycle 24 Announcement . ... Phase II Cycle 23 . ... Retrieving HST Data . ... Instrument Handbook . COS Data Handbook . ... CalCOS v2.15.4 was installed in OPUS on January 12, 2012. A detailed list of changes related to CALCOS v2.15.4 can be found on the "CALCOS Release Notices" web page at http://www.stsci.edu/hst/cos/pipeline/CALCOSReleaseNotes/notes/ ). ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2012_02/calcos_2_15_4.html -- 19.8 Кб -- 12.04.2016
Похожие документы
Похожие документы
453. Calibration of COS Observations of Extended Targets in Cycle 24
... Calibration of COS Observations of Extended Targets in Cycle 24 . ... With the move to Lifetime Position 3 (LP3) of the COS/FUV detector, which occurred in February 2015, the calibration of COS/FUV observations of extended objects, and of COS/FUV observations using the Bright Object Aperture (BOA), has become more complex. ... Extended targets with COS/FUV . ... Users should make themselves aware of the limitations in the calibration of COS/FUV observations of extended targets or with the BOA at LP3...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2016_03/extended_targets -- 22.9 Кб -- 12.04.2016
Похожие документы
Похожие документы
454. Effect of COS FUV Gain Sag on FUV Dispersed Light Target Acquisitions
... Effect of COS FUV Gain Sag on FUV Dispersed Light Target Acquisitions . ... HST Overview . Overview . ... FUV HV History . ... Target Acquisition . ... While this y-walk has no effect in extracted spectra, it could potentially affect FUV dispersed light target acquisitions which use information about where the target's spectrum is found in the cross- dispersion direction vs where it is supposed to be found (determined from the location of the wavecal) to center the target in the aperture. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2010_12/gain_sag_ta.html -- 19.3 Кб -- 12.04.2016
Похожие документы
Похожие документы
455. Release of CALCOS v2.13.6
... HST . Release of CALCOS v2.13.6 . ... Data . ... HST Overview . ... Phase I Proposing . ... Cycle 24 Announcement . ... FUV HV History . ... Instrument Handbook . ... CALCOS v2.13.6 was released as part of STSDAS 3.13 in December 2010 and was installed in the Operations Archive on January 19, 2011 (OPUS Release 2010.4). A detailed list of changes related to CALCOS v2.13.6 can be found on the "CALCOS Release Notices" web page at http://www.stsci.edu/hst/cos/pipeline/CALCOSReleaseNotes/notes/ ). ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2011_01/opus_2010_4.html -- 19.8 Кб -- 12.04.2016
Похожие документы
Похожие документы
456. Incorrect COS ACQ/IMAGE coordinate keywords
... HST . ... Data . ... HST Overview . Overview . ... Phase I Proposing . ... Retrieving HST Data . ... COS Data Handbook . ... The WCS (World Coordinate System) keywords for COS ACQ/IMAGE observations contain an error in the reference pixel for the WCS coordinates. ... Users drafting and submitting Phase II HST programs should remember that the coordinates given by the COS WCS are only as accurate as the coordinates of the guide stars used, and may contain additional sources of pointing error. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2013_06_2/wcs_acq_image -- 18.5 Кб -- 12.04.2016
Похожие документы
Похожие документы
457. Update to the dark rates of the COS FUV segments and impact on ETC calculations
... Update to the dark rates of the COS FUV segments and impact on ETC calculations for Phase I proposals . ... Phase I Proposing . ... Phase II Cycle 23 . ... If the impact to the number of requested orbits is minimal, PIs might want to consider using the conservative dark rate currently implemented in the ETC. ... The Cycle 21 Phase II ETC will be updated with segment-dependent dark rates and will take into account changes to the new blue modes due to the focus change (resolution and extraction height...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2013_02/dark_rates.html -- 22.2 Кб -- 12.04.2016
Похожие документы
Похожие документы
458. COS Data Handbook v3.0 release
... HST . COS Data Handbook v3.0 release . ... HST Overview . ... Phase I Proposing . ... Cycle 24 Announcement . ... Phase II Cycle 23 . ... Instruments . ... COS Data Handbook . ... A new version of the COS Data Handbook (v3.0) has been released and is available here: . http://www.stsci.edu/hst/cos/documents/handbooks/datahandbook/ . The Data Handbook contains full details of the calcos reduction pipeline and the various COS data file types, as well as examples of data reduction strategies. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2015_10/dhb_v3_release -- 18.6 Кб -- 12.04.2016
Похожие документы
Похожие документы
459. Move of COS FUV Spectra to Lifetime Position 3 and Revisions to CalCOS to
... Move of COS FUV Spectra to Lifetime Position 3 and Revisions to CalCOS to Support Spectral Extraction at the New Position . ... News and . ... To mitigate the effects of gain sag on the COS/FUV detector (see COS ISR 2011-05 ) the location of the COS FUV spectra was moved to Lifetime Position 3 (LP3) on Feb 9, 2015 (except for G130M/1055 and G130M/1096 that remain at LP2). ... With the move to LP3, the new spectral location is offset by -2.5" from the original lifetime position (LP1). ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2015_02/new_extraction -- 42.9 Кб -- 12.04.2016
Похожие документы
Похожие документы
460. A 3% increase in the STIS CCD Readnoise at GAIN=4
... HST . A 3% increase in the STIS CCD Readnoise at GAIN=4 . ... The STIS team routinely monitors the readnoise of most GAIN, binning, and amplifier modes available with the STIS CCD by measuring the rms value of bias images. ... Recently, it was discovered that the readnoise suddenly increased for GAIN=1 from 5.7 e- to 6.25 e- on the STIS CCD between 5/14/2014 02:57 UT and 5/15/2014 00:54 UT (See this earlier STAN ). ... Other increases in STIS/CCD readnoise for GAIN=4 have occurred in the past. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/hst/cos/documents/newsletters/cos_stis_newsletters/full_stories/2014_12/STIS_readnoise -- 20.0 Кб -- 12.04.2016
Похожие документы
Похожие документы