. Next: Introduction Up: ROSAT HRI Recipes Previous: Summary of tasks in . љ . Introduction . Data analysis and Spatial Corrections . A Preliminary Investigation . Dewobble Procedure: treating each obi separately . Additional Tools . An Example - 3C 120 . References . rsdc@cfa.harvard.edu . 1998-06-10

RELATIVE SUNSPOT NUMBERS Description of Data from SGD Explanation of Data Reports: Relative Sunspot Numbers -- The relative sunspot number is an index of the activity of the entire visible disk of the Sun. ... The provisional daily Zurich relative sunspot numbers, Rz, were based upon observations made at Zurich and its two branch stations in Arosa and Locarno and communicated by M. Waldmeier of the Swiss Federal Observatory. ... This indicates the uncertainty above and below the predicted number. ...

... Problem 1.1: (4pts) We want to use supernovae as a standard candle to measure luminosity distance as a function of redshift in order to determine the Hubble Constant. ... Problem 2: In a flat Universe, the luminosity distance to an object at redshift z, in a universe made up of i forms of matter each with an equation of state wi and density, i is given by ,1 / 2 z & ) c 3 + 3wi DL = (1 + z) # dz"(% $i (1 + z") + H0 'i * 0 2.1 (5 pts). ... Assume the universe is radiation dominated the whole time. ...

... Watchouts . ... With SAS 6.1 we have released a Time Correlation data treatment, based on a new type of file, containing "Reconstructed Time Correlation (TCX)". This has proven to solve the problems posed in some observations, containing defects in the TCS files. ... SAS 6.5 established the use of the TCX files per default. ... Easily: the environment variable SAS_TIMECORR has to be defined to "TCX" at the beginning of a SAS session. ... Pages maintained by SAS librarian . ...

... Research areas . ... Events The Second All-Russian Research and Practical Conference 'Actual problems in Avionics Research: Theory, Service, Developments' . ... The Second All-Russian Research and Practical Conference 'Actual problems in Avionics Research: Theory, Service, Developments' "(AVIATOR) will take place at the Faculty of Aviation Equipment of the Military Educational and Scientific Centre of Air Force 'Air Force Academy named after Professor N. E. Zhukovskiy and Yu. ...

... We compare our results with the GRANAT X-ray observations of the Galactic center (Churazov et al. ... It is instructive to compare our results for the Galactic center starburst with what might be expected for a continuous star formation, with the average rate characteristic for the whole Galaxy. For this continuous star formation model, we would expect to observe in the region of around the Galactic center about 10% of the total number of X-ray sources in the Galaxy. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . The distance of the Sun from Earth is the basic unit of all astronomical distances. ... The 18th century transits of Venus allowed a proper geometrical determination of this unit to be made for the first time. ... One of the most famous of these problems is the black drop effect. ... They calculated the mean distance to the Sun to be 95 million miles whereas the currently accepted value is close to 93 million miles. ...

... 1996RMxAC___4__118V Informations. relative to: 5-Jupiter reference frame: astrometric centre of frame: topocentre epoch of equinox: J2000.0 time scale: UTC-3h reduction: no information coordinates: X, Y diff. refraction: no information receptor: CCD telescope: Ritchey-Chretien reflector, D=1.6 m, F=15.8 m observers: Veiga C. H., Vieira Martins R. data included in standard data file: no Comments. ... X observed, arcsec 11. ... X calculated, arcsec 13. ... O-C) X observed - X calculated, arcsec 15. ...

... ARTICLE: The Adventurous Search For The Astronomical Unit . ... Kepler himself had suggested to use the rare occasions of Venus transiting (crossing) the solar disk to measure our distance to the planet. ... Due to the orbital inclination of Venus against the ecliptic of 3.5°, a Venus transit is so rare that it happens only at intervals of 121.5 years, 8 years, 105.5 years, 8 years and so on. ... Crabtree witnessing the transit of Venus 1639 . ... Transits of Venus - The Quest for the Solar Parallax...

... Meade Instruments Corporation . ... Refracting telescopes (Meade Models NG-60, NGC-60, DS-2070AT, ETX-70AT, LXD55-AR5, LX55-AR6 ) and mirror-lens telescopes ( ETX-90AT, 105AT, 125AT, LXD55-SC8, 8LX90, LX200 GPS Series ) are generally more versatile in a wide array of land and astronomical applications. ... The intermediate-level observer, or the non-casual telescope user who wishes to purchase one telescope for a lifetime, should consider a Meade Model LXD55 series, 8LX90, or LX200GPS. ... Meade 4M ...

... The Science Operation Department is composed of Astronomers, Telescope Instruments Operators(TIOs) and Data Handling Administrators(DHAs). ... Astronomers have proposed several methods to quantitatively measure the amount of turbulence above the telescope, which the most common ones is Differential Image Motion Monitor (DIMM). In optical testing, the Hartmann test is the common method to test the quality of optical components. ... Hartmann mask consists of 48 lenses. ...

THE RELATIVE MONTHLY MEAN SUNSPOT NUMBER ON OCTOBER 2015 HAS MADE Woct. = 37.1 (old), 61.7 (new) THAT GIVES FOR