. Next: Masses Up: Stellar parameters from calibrations Previous: Stellar parameters from calibrations Contents . Absolute visual magnitudes for stars are derived from their spectral type and luminosity class. Calibrations are stored in files spec_par.V, spec_MV.IV, spec_par.III, spec_MV.II, spec_MV.Ia, spec_MV.Iab, spec_MV.Ib in oyster/starbase . amv_stars Compute MV for all stars in startable. amv_star ( spectrum _char ) Function. Return MV for star with specified spectrum. Christian Hummel 2015-04-28

... HST Overview . ... First on-orbit absolute photometric calibrations for NICMOS were obtained during SMOV. The results of these limited calibrations were used to establish in July 1997 preliminary corrections to the predicted photometry based on ground-based vacuum measurements. ... To quantify the accuracy in the absolute photometry, the observed/predicted countrate ratios for NIC1 , NIC2 and NIC3 filters have been computed with SYNPHOT after photometric corrections for each camera were applied. ...

The technical memorandum: Time and Time Interval Measurement with Application to Computer and Network Performance Evaluation (PostScript) describes a number of techniques for conducting experiments typical of computer network and transmission systems engineering. ... The usual data collected during a performance run of some experiment might include time offsets, time delays, frequency offsets and various error statistics. ...

A computer controlled low light photometer for nightglow observations. Hardware units of portable photometer for low light measurements, especially night glow emission is described. ... Interface card contain three channels of 24 bit counter, 4 channels of 12 bit ADC and the buffer bus for the controlled motors of the altazimuthal fork mounting and filters wheel, the position encoders. ... Where N( ) is output signal photometer generated input light flux F( l ) . ... PMT # . 599 . ...

mabs , the B-band absolute magnitude is computed from the corrected magnitude btc and the distance modulus modz (from the redshift) or mod0 (redshift-independent). For nearby galaxies ( v < 500 km/s, modz is not computed because it would be too imprecise (the peculiar motions dominate the Hubble flow), and the absolute magnitude is computed as: mabs = btc - mod0 For more distant galaxies, it is computed as: mabs = btc - modz . HyperLeda . Questions: leda@univ-lyon1.fr

... Meta Index / Home Page / Fast Mode Photometry Window / Annuli controls When clicked the photometry for the selected source is computed and the computed parameters will be displayed and will replace the values for that source in the source-list. Also, an average magnitude will be computed for all the magnitude determinations made by the user, plus the original one, and displayed in the combobox near the bottom of the window. ... XMM-Newton SOC/SSC -- 2008-07-02 ...

... Archives . ... Differential Emission Measure [Eqn] . ... Astro 301, class 1, and it took all of 20 minutes of talk about stellar magnitudes to put that notion to permanent rest. ... Now, it turns out that the human eye perceives brightness on a log scale, so magnitudes are numerically similar to log (brightness). ... frac{5}{2}\log_{10}\left(\frac{f_{object}}{f_{standard}}\right) \,,$$ . ... frac{5}{2}\log_{10}\left(\frac{L_{object}}{4 \pi d^2}\frac{1}{f_{standard}}\right) \,.$ ... Chandra Blog . ...

ABSOLUTE PROPER MOTIONS OF 331 OPEN CLUSTERS . ... The proper motions of stars in the fields of 331 open clusters were taken from Four-Million Star Catalog (4M-catalog) of positions and proper motions (Volchkov et al. ... The absolute proper motions for 21 young open clusters have been derived by comparison of precise relative proper motions of individual stars and their corresponding absolute proper motions. ... Sign of proper motions in RA . ... 0.0001 arcsec/yr . ... rms error in RA proper motion . ...

... Avg: the average value of the spectra (maybe throwing out some channels at the edges). <>:average over the spectra (throwing out points at the edges if you want). gCal(f) :- frequency dependence of the tabulated cal values. ... calInK(Avg): Scaler cal value averaged over the band. calOffSpc(Avg): cal off value averaged over the band (in spectrometer counts) . ... cntsToK(avg) = calInK(Avg) / (calDif_cnts(Avg)) . To convert a spectrum b_cnts in spectrometer counts to b_K in Kelvins using cntsToK: . ...

Next: The Photometric Performance of Up: NICMOS Data Calibration and Previous: Status and Goals of . ... Absolute Spectrophotometric Standards . Absolute Photometry . ... Velocity shifts and Photometry with Narrow-band Filters . ... HST, NICMOS, near-infrared, standards, photometry, calibration . ... In practice NICMOS does not have a set of filters matching any of the standard ground-based photometric bands and this poses a challenge when trying to achieve precise absolute photometry. ...

... Meade Instruments Corporation . ... Autostar Computer Controller Instruction Manual . Autostar Computer Controller . ... NOTE: This manual covers both Model #495 Autostar and #497 ETX Autostar Computer Controllers. ... Autostar Primary Menus and Options . ... Chapter 3: Alignment . ... Guided Tour Menu . ... Chapter 5: Autostar Menu Functions . ... Meade Autostar Computer Controller . ... Meade #505 Connector Cable Set Manual . ... Copyright 2006 Meade Instruments Corporation, All Rights Reserved. ...

Next: Writing Visibility FITS Files Up: Reading Visibility FITS Files Previous: AIPS Frequency Bugs . The time stored in a Miriad visibility dataset is nominally UT1 (although the difference between UT1 and UTC is not significant for the purposes of Miriad ). ... When a FITS file contains multiple antenna tables, the times stored in the FITS file have usually been offset from the true time by the AIPS task DBCON . Task fits assumes that such an offset has been added, and corrects for it. ...

... It is precisely these values that are displayed as O – C. In case computed positions of minor planet for all or some part of moments are found without accounting for perturbations, the corresponding moments are followed by asterisk (without perturbations are computed positions for all minor planets if moments of their observations lie outside the basic interval of 16 months or for ordinary ... The coordinate system and type of computed positions are indicated in status bar. ...

ON THE IMPACT OF THE GALACTIC ABERRATION ON VLBI-DERIVED PRECESSION MODEL Z.M. MALKIN Pulkovo Observatory Pulkovskoe Ch. ... Corrections to adopted precession rate are usually computed from the linear trends in long-term time series of celestial pole offset (CPO), which are the differences between the measured and the theoretical coordinates of the celestial pole. ... CONCLUSIONS We have estimated the impact of GA on parameters of precession-nutation model derived from VLBI observations. ...

... Dr. Ravil Nazirov is the head of the workshop, and Andrew Ananjev is the secretary of the workshop. ... The workshop is used to be held in the last decade of the month, preferably on Tuesdays. ... The next session will take place October 29, 1996 . ... There is "CONPAS" mailing list which you can join to discuss issues of problem solving and to be automatically notified of important dates and decisions with respect to the coming sessions. ... Secretary of the Workshop: Andrew Ananjev . ...

... int abs ( int n) - Get absolute value of an integer . double acos( double x) - Compute arc cosine of x. double asin( double x) - Compute arc sine of x. double atan( double x) - Compute arc tangent of x. double atan2( double y, double x) - Compute arc tangent of y/x. double ceil( double x) - Get smallest integral value that exceeds x ...

Participants of the High Performance Computing courses held at the Armagh Observatory. Staff and students from institutions throughout the island of Ireland have visited the Armagh Observatory to attend three advanced courses on High Performance Computing (HPC) over the 4-day period 16th to 19th February 2009. ... The advanced HPC courses were delivered by staff from the Irish Centre for High-End Computing and the National University of Ireland, Galway . ...

The original files with the data were in different formats. ... Such files were named "standard data files" and linked to the database. They can be easily transformed to any desirable format by a code. Here we present two simple computer programs of this kind. ... When running the code, you can specify columns in the output file: wavelength, energy (eV) or wavenumber (cm -1 ) as the first column, and complex refractive index or dielectric function as the second and third columns. ...

... Using the Echelle with TUI . Using the Echelle with Remark . ... Configuring TUI to use the Echelle . Setting up the Echelle exposure parameters . ... Focusing the Echelle . ... Changing the echelle guider filters . ... Configuring Remark to use the Echelle . ... Echelle User's Manual . ... The Echelle home page is http://astro.uchicago.edu/echelle . ... Echelle Description . ... Enclosure . ... schematic CAD files . schematic PDF files . ... enclosure wiring schematic . ...

... In this report the measurement results are presented of the ACE Benchmark Suite, run on a variety of UNIX based systems, ranging from personal computers, through workstations, to multi-processor superminis. ... This 1988 edition of the report "Benchmarking UNIX Systems" contains the results for many new systems, besides some which were already present in the previous, September 1987 issue. ... 3.6 From the Philips Set 16 . ... Hewlett & Packard 152 . 14.1 The Hewlett & Packard HP 9000/319 152 . ...