... We will consider the rms, (K), for observations with a receiver of system temperature, T , frequency resolution, per polarization, and total integration time per observing cycle, . ... For ``in-band'' frequency switching, the line under investigation is always in the observing band. ... Position Switching or ``Out-of-Band'' Frequency Switching: Here the line is only observed for one half of the time, with noise being present all of the time. ...

Еще в разделе: (Показать все результаты (>7074) - www.naic.edu/ )

• The Telescope Optics and Pointing
• Calibration Scans on Continuum Sources
• Calibration Scans

... Current APO Weather . ... Search Site . ... Information for New Users . ... Technical Staff pages . Night Logs and Mailing Lists (maintained by APO) . ... Technical Documents and Database Search . ... Observer's Documentation and Procedures . ... Problem Reporting and APO Technical Documents Database Search . ... APO Drawing/Document Management Procedures . ... APO Technical Documents Database Search . Home Astrophysical Research Consortium . ... Mail Lists (maintained by APO) . ...

Еще в разделе: (Показать все результаты (>953) - www.apo.nmsu.edu/ )

• Astrophysical Research Consortium - Apache Point Observatory
• Observers Instructions for filling out the ARCSAT nightlog

These observations are aimed at fully charactering FORS1 photometric system (UBVRI zero-points, color-terms and extinction coefficients) for the Tektronix 2048x2048 pixel CCD (24µm px) . To this aim, the two Landolt/Stetson photometric fields SA95 and SA101 will be observed on a number of epochs and at different airmasses during February and March 2007. ... SA101 . ... OBs for SA101 have to be observed during evenigh twilight (exceptions are expected for the second half of March) . ...

Еще в разделе: (Показать все результаты (>66844) - www.eso.org/ )

• ESO - ALMA
• ESO - Swedish Heterodyne Facility Instrument Science Verification
• FORS Sec Std and Abs Phot Project

... Go to new wiki . ... TidNotes / . The antenna pointing models, subreflector rotation, first source coordinates etc are different depending on the observation. ... Build link with antenna and receiver, spacecraft 50 (VLBI), pass 0, two receivers. antenna startup . in NMC:CTRL Connection Control: . ... Check for: . ... ap move r=240 . ... select SC 99 and S band and [apply]) . ... You will need to enter offset commands at the NMC and observe the effect with xplot or the squarelaw sampler plot. ...

Еще в разделе: (Показать все результаты (>32101) - www.atnf.csiro.au/ )

• Pulsar Group Observing/Psrcorr
• SEST -- MOPRA Comparison at Millimetre-Waves
• lbaops:tidnotes:antennastartup [ATNF VLBI Wiki]

. XMM-Newton Science Analysis System . arfgen (arfgen-1.70.4) [xmmsas_20060628_1801-7.0.0] . Meta Index / Home Page / Usage and Examples . Here is another example with an explicit source position - (1000,-1000) in DET coordinates - specified: . arfgen spectrumset=spectrum.pha . withsourcepos=true sourcecoords=det sourcex=1000 sourcey=-1000 . See also 5.4 for details of why the task needs the source position, and how to change it. XMM-Newton SOC/SSC -- 2006-06-28

Еще в разделе: (Показать все результаты (>9292) - xmm.vilspa.esa.es/ )

• Example 1: Point source

The Linear Ramp Filters (LRFs) provide a narrow band ( ) imaging capability which is continuously tunable from 3710е to 9762е. These are essentially a collection of narrow band interference filters whose central wavelength varies with position on the filter glass. ... If it is necessary to know which CCD will be used, observers can consult Table 3.7 or Table 3.8 , or use the on-line LRF calculator tool on the WFPC2 WWW pages. ... See Linear Ramp Filters for further details on LRFs.) ...

Еще в разделе: (Показать все результаты (>20283) - www.stsci.edu/ )

• Observing Faint Targets Near Bright Objects
• Observing Faint Targets
• Examples and Photometric Tests

... Exposure Time Calculator (ETC) . ... ESO - Public Surveys . ... the recommended values to use for DIT, . ... Detector on-chip integration (DIT): seconds. to your chosen value - a separate page gives recommended values to use for DIT - for modes 1 and 2 below you may wish to start with the maximum recommended values as these will minimize the effect of read noise (a total object exposure of Y secs with DIT=X secs will produce Y/X lots of read noise) and give you a lower limit on the time needed. ...

Еще в разделе: (Показать все результаты (>28) - www.vista.ac.uk/ )

• VISTA - Visible and Infrared Survey Telescope for Astronomy

... Activity 3: Measuring the Position of the Sun in the Sky . Purpose: To give students the opportunity to measure the position of the Sun in the sky using simple tools and methods. ... Alternatively, you may have students devise their own methods of relative measurement and apply them to measuring the position of the Sun in the sky. ... Rangi is the sky, and when the Sun is near Rangi's head it is summer in New Zealand. ... Read the Maori story to students. ... back to Teachers' Newsletter Main Page ...

Еще в разделе: (Показать все результаты (>1322) - www.astrosociety.org/ )

• ASP: The Story of Astronomy
• ASP: Low-Level Observing
• ASP: Guest Observer

... On-line calibration consists of calibration operations performed to maintain the ALMA observing system properly tuned to successfully execute the planned observations. ... Among processing operations are the calibration of the atmospheric absorption, of phase radiometric correction, of pointing scans, of phase and amplitude reference measurements, .. ... In the mean time tests of the calibration software will proceed using both simulated data and data from the antenna prototypes...?re 1 . ...

Еще в разделе: (Показать все результаты (>1845) - www.adass.org/ )

• Using Java for Astronomy: The Virtual Radio Interferometer Example
• ADASS 2002 Conference Proceedings
• Electronic Submission of HST Phase I Observing Proposals

... This appartus will drop a mass from different heights. When the mass strikes the ground, some percentage of its original energy will be absorbed by the ground. ... The percentage of the energy which is absorbed by the surface on each "bounce" (EAS) . ... The impact velocity of the object will also be given at each bounce. ... Start= Drop the ball after Energy, Mass and EAS have been set; resume after step or pause has been selected . ... Reset = Reset experiment to intial values . ...

Еще в разделе: (Показать все результаты (>389) - zebu.uoregon.edu/ )

... With enough velocity, a spacecraft can break loose from the Earth's gravity and enter an orbit around the Sun, like that of a planet. If it then orbits the Sun with the same period as the Earth--one year--it may keep a fixed position relative to Earth. ... If the distance is just right--about 4 times the distance to the Moon or 1/100 the distance to the Sun--the spacecraft, too, will need just one year to go around the Sun, and will keep its position between the Sun and the Earth. ...

Еще в разделе: (Показать все результаты (>872) - www.iki.rssi.ru/ )

• The Wind Spacecraft
• Trigonometry--what it is good for?
• Kepler and His Laws

... With enough velocity, a spacecraft can break loose from the Earth's gravity and enter an orbit around the Sun, like that of a planet. If it then orbits the Sun with the same period as the Earth--one year--it may keep a fixed position relative to Earth. ... If the distance is just right--about 4 times the distance to the Moon or 1/100 the distance to the Sun--the spacecraft, too, will need just one year to go around the Sun, and will keep its position between the Sun and the Earth. ...

Еще в разделе: (Показать все результаты (>1226) - www.cosmos.ru/ )

• Seasons of the Year
• Trigonometry--what it is good for?
• Trigonometry beyond 90 degrees

IBIS Data Analysis . ... IBIS . ... Flat Fielding - Introduction . The images obtained by IBIS will have intensity variations across the field of view that are not due to the solar image, but rather caused by instrumental effects that alter the observed intensity in each point of the field of view. ... IBIS Flat Fielding Techniques . ... Therefore, it is desirable to obtain the flat field measurements center on a point along the equator near the heliographic center of the solar disk. ...

Еще в разделе: (Показать все результаты (>9954) - www.arcetri.astro.it/ )

• mod_setenvif - Apache HTTP Server
• Procedures for Observations
• Arcetri designs innovative superconductor microwave filters for the Sardinia

... Fields Observed . ... Data Archive . ... Complete Optical and X-ray data for all ChaMPlane fields are available through the DS9 VO interface . ... functionality of DS9 is available to manipulate the results in addition to those provided by the "Champlane tools" You can select images, compare . ... our region of interest has been selected by drawing a red square region on the image. at bottom left the high res optical image of that selected region, and on the right is the X-ray image. ...

Еще в разделе: (Показать все результаты (>4813) - hea-www.harvard.edu/ )

• An Example - 3C 120
• ChaMPlane apj_appendix
• Where to Find Example/Test Code

... 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...

Еще в разделе: (Показать все результаты (>8321) - www.sai.msu.su/ )

• Lighting plug-in
• APOD: March 31, 1996 - Comet Hyakutake Finder Chart for Early April
• Further Information and Bibliography

... A comparison of the computed and experimental relations F max ( H), as well as comparison of drift scans of point sources across different horizontal cross-sections of the BP with the corresponding computed cross-sections were made. ... The drift scans of the point source 3С84 (H=87 o ) at the wavelength 7.6 cm across the horizontal cross-sections of the BP (black lines) and the computed horizontal cross-sections of the BP corresponding to them (red lines). ...

Еще в разделе: (Показать все результаты (>1097) - jet.sao.ru/ )

• Instrumentation
• Receiving signals - signal()
• Low Level Operators and Bit Fields

Here user should specify the origin of coordinate system (observer's position). In case of rectangular coordinates it can be center of any major planet or the Sun or any minor planet. ... For spherical coordinates the origin of coordinate system can coincide only with the center of the Earth or with any point on the Earth surface. ... a)by code of observatory in the list of observatories maintained by Minor Planet Center (see IX. Observatories ). b)by introducing name of observatory. ...

Еще в разделе: (Показать все результаты (>649) - www.ipa.nw.ru/ )

... Comet Ikeya-Zhang, designated C/2002 C1 (Ikeya-Zhang), is named after Kaoru Ikeya of Shizuoka prefecture, Japan, and Daqing Zhang of Henan province, China, who independently discovered it on the night of 1 February 2002. A preliminary orbit reported the following day indicated that it would come moderately close to both the Earth and the Sun and that it might become visible to the naked eye during late March and April 2002. ... Bailey, M.E., Clube, S.V.M. and Napier, W.M. The Origin of Comets . ...

Еще в разделе: (Показать все результаты (>3105) - star.arm.ac.uk/ )

• sfit help file
• Planetary positions
• Faulkes Telescope

The preliminary version of documentation of the format for the interchange of calibrated optical/IR data being developed by Tom Pauls of NRL and John Young of COAST was presented and a number of issues discussed. The proposed format is in the general form of a relational database with different components stored in FITS binary tables. ... Should there be a single data table type that includes all data types, or multiple table types, one per data type? What data types are needed? ...

Еще в разделе: (Показать все результаты (>3094) - www.mrao.cam.ac.uk/ )

• Welcome Bojan Nikolic web pages (r. 329)
• Introduction to phase correction for ALMA Bojan Nikolic web pages (r. 329)
• Astrophysics Group VSA

You can search an object from a designation. ... NGC4486 It is also possible to find an object from a positional cross-identification by following the examples: . ... nearest:[J123049.2+122329,10] which mean respectively: the nearest object to the position J123049.2+122329 , or the nearest object to the NED position of object named in NED: Virgo A . ... For example NGC4486%,NGC337% When a designation is returned out of HyperLeda it is chosen out of the whole list of names descending the hierarchy: . ...

Еще в разделе: (Показать все результаты (>2553) - www.sao.ru/ )

• Discussion
• Entry points
• Event Handling