... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

Next: On the Fly Bad Pixel Detection for the Chandra X-ray Observatory's Aspect Camera . ... Using these models we have produced a set of simulations of the Chandra point spread function (PSF) which is available to the users via PSF library files. ... The image pixels indicate the number of counts used for each PSF image. ... High resolution library (I) with a step of 1 arcminute between images: contains 1$$m pixel images covering a 1 to +1 arcminutes grid (3 3) about the optical axis. ...

... Дни открытых дверей к юбилею САО РАН (12-14 апреля 2016 г.) . Международная конференция "Dark Ages and White Nights (Spectroscopy of the CMB)" (20-24 июня 2016 г.) . ... Международная конференция MULTI-SPIN GALAXIES - 2016 (26-30 сентября 2016 г.) . Международная астрономическая конференция "Физика звезд: от коллапса до коллапса" (3-7 октября 2016 г.) Архив . ... Подробнее.. ... 10.02.16 . ... БТА в реальном времени . ... Цейсс-1000 в реальном времени . ... Последнее обновление: 22/03/2016 ...

... Oke (AJ, 99, 1621, 1990) has provided absolute spectral energy distributions covering the wavelength range 3200 to 9200A in AB magnitudes for 25 stars. ... The reduced magnitudes are tabulated at 1A intervals from 3300 to 4700A and at 2A intervals from 4700 to 9200A. Comparison of the fluxes with those determined elsewhere showed that Oke's absolute magnitudes are systematically brighter by 0.04 mag. The magnitudes and fluxes plotted have been corrected for this effect. ...

... Reference Data for Calibration and Tools . ... There are two independent directories which contain the spectra of ultraviolet and optical standard stars. The CALSPEC directory contains the composite ultraviolet and optical absolute calibrated reference spectra of the HST standards. ... Details of the CALSPEC data, along with another supplemental CALSPEC directory, are contained in the above web page. ... Another directory of supplemental calspec data is available and detailed on the calspec page. ...

... Public . Science . ... Science Users Information > Observing with ESO Telescopes > Observing Tools and Services > Standard Stars Catalogues . ... Observing with ESO Telescopes . ... Publications with ESO Data . ... Large Programmes . ... ESO/GTC Programmes . Public Surveys Programmes . ... Phase 1 Proposals . ... Public Surveys Phase 2 . ... Science Data Products Forum . ... ESO Data . ... ESO Data Access Policy . ... Below follows a non-exhaustive list of on-line standard star catalogues. ...

DIGITAL WDC EXCHANGE FORMAT . FOR OBSERVATORY 1.0 MINUTE VALUES 1. ... DATA-1 .. DATA-60 are 1-minute values of the given element for that hour. ... Typically, digital 1-minute values received by WDCs from organizations operating automatic magnetic observatory instruments are averages of more frequendy sampled values, e.g. 10-second point samples. ... If the method used to obtain 1-minute average values is important to a user, the WDC will assist in determining the exact procedure applied. ...

The Astronomical Society of Australia has been asked by STANDARDS AUSTRALIA to compile a list of "designated" optical observatories that are valuable resources for (i) research, (ii) education and (iii) community use. The ASA is the final arbiter of whether any particular observatory is so designated. ... Upon receipt of your application form, your observatory will be entered on a list of "Pending Designated Observatories" on the ASA Home Page. ... It will be emailed for you. ... Email . ...

... Archives . ... His foremost knowledge and historic account on statistical models related to errors may benefit astronomers. Although I didn?t study history of astronomy and statistics, I?m very much aware of how astronomy innovated statistical thinking, particularly the area of large sample theory. ... On the history and use of some standard statistical models . ... The particular reason for this paper into the slog is the following sentences: . ... Chandra Blog . ML Theory . ...

Next: Column label: TELESCOP Up: File Formats Required Previous: MJD --- column . Data for all the telescopes at an observatory can be stored in a single MIDAS table file, called (by default) esotel.tbl. A standard path needs to be established for this file. ... Each observatory file should contain a C*72 descriptor OBSERVATORY that contains the name of the observatory, preferably as it is given in [ 6 ]. ... Each column label can be a standard FITS keyword, if an appropriate one is available. ...

... The material in "From Stargazers to Starships" meets several important requirements of the national standards. Pages cited below are from National Science Education Standards National Academy Press, Washington 1995. ... For example: the sections on astronomy not only describe calendars and sundials (including their construction), but also the astronomy of the ancient Greeks, including two different ways in which ancient Greeks estimated the distance to the Moon. ...

The GPS and GPS Common-view are the methods used to refer measurements made using the Parkes observatory clock ("UTC(PKS)") to Universal Coordinated Time (UTC). ... Transfer from UTC(AUS) to UTC is possible via the offsets reported in Circular T. These methods of the clock corrections commenced on the MDJ 50844. ... Currently used scheme is fully integrated into tempo2 , where fairly regularly sampled values of the offset between pairs of clocks are recorded in ASCII text files, one pair per file. ...

Chandra X-Ray Observatory CXC 1E0102.2-7219 as a Standard Candle for X-ray Astronomy Paul Plucinsky, Joseph DePasquale, Steven Snowden Paul Plucinsky 1 ICWG June 2006 Chandra X-Ray Observatory CXC Why Use E0102 as a Calibration Source for X-ray Astronomy? ... Paul Plucinsky 2 ICWG June 2006 Chandra X-Ray Observatory Gratuitous Pretty Pictures of E0102 S3 Summed Data ~100 ks True Color Image CXC Paul Plucinsky 3 ICWG June 2006 Chandra X-Ray Observatory Spectral Model: Calibration vs. ...

Standard analog magnetograms (20 mm / sec) are presented in the form of digital images, . ... Observatory, . ... 1949 , 1950 , 1951 , 1952 , 1953 , 1954 . ... 1951 , 1952 , 1953 , 1954 , 1955 , 1956 , 1957 . ... 1950 , 1951 , 1952 , 1953 , 1954 , 1955 , 1956 , 1957 , . ... 1950 , 1951 , 1952 , 1953 , 1954 , 1955 , 1956 , . ... The project was conducted in 2003 by the International Council for Science ( "Rescue of Old Analogue Magnetograms by converting to digital images" , ICSU Grant–2003 Project). ...

... The New 1997 IEEE Standards Products Catalog features the complete listing of standards publica-tions and services IEEE Standards offers, along with the information you need to place your order. ... Books and Other Products on Standards - contains a detailed listing of informative print and electronic publications relevant to standards and their implementation in areas of electrical engineering, electronics and computer technology. ... IEEE Standards Products Listing 22 . ... Power Electronics 41 . ...

... The main 7C survey at 151 MHz with resolution 70?70 cosec(declination) arcsec 2 (EW?NS) covers a large part of the northern hemisphere above declination 30њ, excluding the Galactic plane.There is now a final unified non-redundant catalogue for this main survey in ASCII format together with a CDS-style ReadMe file, both available by ftp from MRAO. ... Regions surveyed at resolution 70?70 cosec(dec) arsec 2 , ftp accesses standardised data: . ... a region centred at 17 h , 65њ: ftp ; . ...

. To redirect the standard output from a command use the > (greater than) symbol followed by the name of the output file. If the file that you redirect standard output to does not already exist it will be created. For example: grep Smith /etc/passwd > popular . This redirects the standard output from the grep command so that it goes to the file popular . This file will contain all occurrences of the string Smith that were found in the /etc/passwd file. **Caution** . Did You Know? .

The CHIANTI database consists of 4 primary ASCII files for each ion in the database. contains the energy levels in cm^(-1) It includes both experimental data and theoretical values of the levels energies. ... MNRAS, 264, 627, 1993 %observed energy levels(4-5,7-8,12,14,17-21,23-27): NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61, 1995. ... contains the spline fits to the electron collision strengths scaled according to Burgess and Tully (1992). ...

... SAI CAS . ... Catalog Access Services . ... This site is about the Virtual Observatory project at the Sternberg Astronomical Institute, Moscow University ( SAI MSU ). We provide a public access to the growing set of astronomical services developed by the SAI RVO development team in accordance with the Virtual Observatory standards. ... We provide access (programmatic and interactive) to the all major and biggest astronomical catalogs (about 4 billions objects total) as well as other web-services. ...

. " The Arecibo Observatory is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations . expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation."