On' failures in the NIRSpec MEMS ST-ECF Instrument Science Report NGST 2002-02 The effects of `on' failures in a MEMS array for the NGST NIRSpec Santiago Arribas, Robert Fosbury Peter Jakobsen --1-- ST-ECF Instrument Science Report NGST 2002-02 The effects of `on' failures in a MEMS array for the NGST ... Assuming that the spectrum of a single facet uses 2000 detector pixels, only 0.01% of `on' failures is acceptable (i.e., 400 facets in a 2k в 2K MEMS array). ...

... To go back in time, archaeoastronomers and teachers can turn to personal computers and any of a number of software packages. ... Examples include the Long Man of Wilmington, England and the Owl Man of Peru (see figure 8 and figure 9 ). ... Deciphering the unique number system of the Maya is another archaeoastronomy topic that involves a minimum of math. ... Several collections of early writing of the Maya survive; numbers from them can be read and in some cases interpreted (see figure 12 ). ...

... The experience of determination of the link between radio sources and dynamical reference frames is presented. To obtain this connection we used a series of very long baseline interferometry (VLBI) observations of the spacecraft Phobos-2 and angularly nearby quasars. ... The dynamical reference frame is determined by equator and equinox of these ephemerides. ... References . ... The relative orientation of the radio and dynamical reference frames can be described by a sequence of three rotations . ...

. Field of research interest . Telecommication networks and systems , Programming. Scientific Degree . Student of MIPT. Position . Laboratory assistant of IKI. Department Number . 902 (Space Monitoring Information Support) . Postal Address . Space Research Institute . Russian Academy of Sciences . Profsoyuznaya St. 84/32 . Moscow, RUSSIA . Postal Code . 117810 . Telephone Number . +7(095) 333-53-13 . E-mail . andrew@d902.iki.rssi.ru . If you want to get more information click here

... Sun's ecliptical positions. Explanations. Each row contains at 0h of Time Dynamical Terrestrial: month, day , day of the week, julian day number at beginning of day (only last three digits is given, add head of column to form correct number ), longitude in system of mean equinox of date (degrees, minutes, seconds ), two latitudes (the first for mean equinox of date and the second for mean epoch of year; seconds ), radius-vector (astron. units), precession in ...

... J5: Radio and Radar Studies of the Solar System. ... Analogously, the key idea of the USSR (United Solar System Radar) concept would be the thousandfold increase in sensitivity over existing radar astronomy facilities, and besides, only the tenfold increase in transmitting power and collecting areas of transmitting and receiving antennas is necessary for this purpose. ... So, let us try to imagine the scientific impact, which would provide this United Solar System Radar. ... 3)  Asteroid's moons; . ...

... January . February . March . April . ... November . December . ... April ((April Fools)) . ... April (Star Party Reports) . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... 8 February , 2014 SAI seminar (Ryde et al 2010) 5 Thermal emission from GRB jet progenitor observer photon jet Photosphere (=1) · · · · Photons are not produced at the photosphere We have to calculate radiative transfer We need to know where the photons are produced We construct the expression for effective optical depth in relativistic flow considering random walk process in relativistic flow SAI seminar 6 8 ... 8 February, 2014 SAI seminar 28 ...

... March 25, 2006: Version 3.0.0 New control panel with an observing queue and a log Pointing to apparent position including proper motion precession and nutation to epoch of ... declination axis to polar axis non-orthogonality optical axis skew altitude- and azimuth-dependent mechanical effects encoder reference Control of telescope hardware August 20, 2006 Version 3.0.4 Modifications from Dan Azari adding features suported by the RC Optical Systems ...

Scale-heights of the Galactic disk subsytems with different ages and metallicities . V.Marsakov & Yu. ... It is based on the fact, that all stars cross the disk plane several times during their Galactic orbital period. ... We have used our representative sample of nearby disk F2-G2 stars Marsakov & Shevelev (1995) in which fundamental stellar parameters was determined on the basis of published date on uvby-photometry, proper motion and radial velocities. ... Marsakov V.A., Shevelev Yu.G. Bull. ...

... Behemoth black hole found in an unlikely place . ... black holes . ... Observing springtime deep-sky objects with a large telescope . ... Could large numbers of black holes account for much of the "dark matter" estimated to exist in our universe? ... NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University) No, because the universe never had the raw material to grow enough black holes to account for current estimates of dark matter. Get instant access to subscriber content on Astronomy.com! ...

Statistics of sunspot activity . The sunspot indices . ... The solar regions . ... 2016 . ... February . ... February, 2016 . Visual indices of solar activity by author's observations . ... Average . ... 0.00 . ...

Please enter the lightcurve file name and period search parameters: . Lightcurve file: . ... Apply the Heliocentric correction and convert all dates to Terrestrial Time (TT)? ... Also, the Heliocentric correction cannot be applied to such lightcurves. ... This period search service is also available at the mirror sites: Mirror 1 , Mirror 2 , Mirror 3 , Mirror 4 . You may download the latest source code distribution and install the period search service at your own web server. ...

I/146 Positions and Proper Motions (Roeser+ 1988) ================================================================================ Catalogue of Positions and Proper Motions Roeser S., Bastian U. =1988A .. ... 449R ================================================================================ ADC_Keywords: Positional data; Proper motions Description: PPM North gives J2000 positions and proper motions of 181,731 stars north of -2.5 degrees declination. ... The mean epoch is near 1931. ...

DSS Mirror Archive at SAI MSU Search Position in the form "ra,dec" where ra and dec are given in decimal degrees in the ICRS coordinate system. ... ALL GRAPHIC METADATA image/fits image/jpeg . Field name Survey Observation midpoint as Modifed Julian Date RA of image center Dec of image center Number of axes Image size Image scale for each axes Bandpass CD matrix Reference pixel Reference pixel Projection Coordinate system reference frame Image format Image URL ...

... Home Lectures Lecture Series 2015-2016 . ... Lecture Series 2014-2015 . ... Beyond New York City . ... The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the public. ... Amateur Astronomer Association is pleased to announce we will be offering select, limited reserved seating for current AAA members for the Friday, January 8, 2015 AAA Lecture entitled Robert Nemiroff ?2015 Astronomy Picture of the Day?. ...

Crater Gassendi . ... I made this drawing was made on the 26th of november 2001. If you compare this one with the previous drawing of Gassendi (below) the differences are clear. ... This drawing was made on the 28th of september 2001. After nearly a full month without observations I had a one hour gap between the thicker clouds. ... This drawing was made on the 29th of august 2001. ... This drawing was made on the 27th of august 2001. ... This drawing was made on the 25th of august 2001. ...