... HST . ... Data . ... HST Overview . Overview . ... Cycle 24 Announcement . ... Retrieving HST Data . ... Instruments . ... Grism Spectroscopy . ... UVIS Flats . ... Instrument Handbook . Data Handbook . ... The Wide Field Camera 3 (WFC3) is a fourth-generation UVIS/IR imager aboard the Hubble Space Telescope (HST). WFC3 was installed in May 2009 during HST servicing mission 4, and replaces the Wide Field Planetary Camera 2 (WFPC2). ... ISR 2016-09: WFC3 Cycle 22 Proposal 14007: UVIS Gain . ...

Prime focus adapter . The optical reducer is mounted on the universal adapter of the prime focus, which contains two movable bundles of fibers for the off-axis guiding, lamps for the calibration of the wavelength scale (a He-Ne-Ar lamp) and for flat fielding (a continuous spectrum lamp). The lamps are placed in an integrating sphere providing uniform illumination of the field. ...

Blackholes2 Forum Message . ... Post . ... A Field Does Not Contain Energy? ... Post Message | ... Here are two sites of many which use rest mass terminology. http://www.iop.org/EJ/abstract/0026-1394/41/5/S04/ . ... This site refers to the energy contained in a static gravitational field. http://www.ias.ac.in/currsci/mar25/articles27.htm . ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Files in red?history) . ... Field Lines . ... EM Waves . ... Magnetic field lines similarly describe the structure of magnetic fields in three dimensions.They are defined as follows. ... Maxwell Most scientists nowadays view field lines as intangible abstractions, useful only for describing magnetic fields. ... Maxwell also showed (perhaps his greatest achievement) that an "electromagnetic wave" was possible, a rapid interplay of electric and magnetic fields spreading with the velocity of light. ...

... Files in red?history) . ... Field Lines . ... EM Waves . ... Magnetic field lines similarly describe the structure of magnetic fields in three dimensions.They are defined as follows. ... Maxwell Most scientists nowadays view field lines as intangible abstractions, useful only for describing magnetic fields. ... Maxwell also showed (perhaps his greatest achievement) that an "electromagnetic wave" was possible, a rapid interplay of electric and magnetic fields spreading with the velocity of light. ...

Astronomy Picture of the Day . ... 15.09.1998 . ... The above New Technology Telescope SUSI Deep Field photograph isolated a small patch of sky picked to contain no bright objects at all. A very long exposure was then taken, similar to the Hubble Deep Field , in order to see the many faint objects that are usually washed out by the light of bright foreground objects . ... September 1998 . ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: universe . ...

... There are two ways to produce flat fields for use with IR data. The standard method is to take 'LAMP ON' and 'LAMP OFF' exposures of the calibration spot on the telescope dome. The 'LAMP ON' exposure contains light from both the calibration lamp, which should provide the even illumination needed for the flat field, together with potentially uneven illumination from the telescope and instrument environments. ... In MIDAS, you may directly use COMPUTE/IMAGE to perform the subtraction. ...

... Tonight's Sky . ... Observing . ... Sky this Month . ... Observing Podcasts . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Iceland: Northern Lights, Lava Fields, and Glaciers . ... The northern lights . ... Iceland, the least densely populated country in Europe, is a land of boiling mud pools, spurting geysers, glaciers, and waterfalls. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Bionic eyes. If our eyes could see in different wavelength bands, this is what the Sun would look like. ... Visible light, crucial to photosynthesis, is a type of radiation. ... At the heart of this revolution is the recognition that light travels as a wave. ... Dreams of Fields . ... By the time the fields go from strong to weak and back to strong, the wave has moved a certain distance, known as the wavelength. ... Red light, blue light, infrared light, ultraviolet light, radio waves, x-rays ? ...

... 2010 July 19 . Dark River, Wide Field . ... Scrolling right will reveal many of these objects including (can you find?) the bright orange star Antares , a blue(-eyed) horsehead nebula , the white globular star cluster M4 , the bright blue star system Rho Ophiuchi , the dark brown Pipe nebula , the red Lagoon nebula , the red and blue Trifid nebula , the red Cat's Paw Nebula , and the multicolored but still important center of our Galaxy . ... About APOD | ...

Galaxy Detection within the RATS project Michael Campbell Zone of Avoidance Our solar system lies about two thirds, or 25,000 light years, away from the galactic centre of the Milky Way. ... The Galaxy Threshold Value After much trial and error it was discovered that the vast majority of object with a star class less than 0.35 were galaxies and the vast majority of objects above 0.35 were stars. I called this the Galaxy Threshold Value. ... Not every object of star class beneath 0.35 is a galaxy. ...

... This thread contains a step-by-step recipe to extract EPIC (pn will be used as an example) light-curves of a point-like source, starting from a calibrated, concatenated event list (either produced with epproc or available as PPS product; it will bear the name: PN.fits in this thread). The content of this thread is the same as Extraction of a X-ray light curve for a point-like source (command-line version). ... in the lccorr GUI window (see Fig.7) define at least the following widgets: . ...

The T-matrix or transition matrix is well known in the quantum theory of scattering [ 56 ] where one also uses the Heisenberg S-matrix connected with the T-matrix by the relation . In contrast to the coordinate representation in the integral equation method, where the scattered and incident fields are connected by the Green function, the T-matrix connects the coefficients of the expansions of the scattered and incident fields in terms of a complete system of the vector basis functions. ...

... celprm Struct Reference . ... It consists of certain members that must be set by the user ( given ) and others that are set by the WCSLIB routines ( returned ). ... Given and returned) This flag must be set to zero whenever any of the following celprm struct members are set or changed: . ... Given ) The native longitude, [deg], and ... double celprm::theta0 . Given ) ... the native latitude, [deg], of the fiducial point, i.e. the point whose celestial coordinates are given in celprm::ref [1:2]. ...

... Previous: Generalized Linear Multi-Frequency Imaging in VLBI . ... At Astronomical Observatory of Valencia University (OAUV), CCD observations of asteroids and big planets satellites are obtained since 2001 with a big format camera and several telescopes. ... Software for comparison of single and overlapped CCD fields obtained at different epochs has been developed. ... After images measurement in CCD field, catalogue stars are identified and adjusted with images. ...

... See "About ATMoB" / "Network" for more details on the clubhouse network. ... Direct viewing of a laser-pointer beam, even briefly and at a distance of a kilometer or two, has the potential to cause temporary flash blindness — the same effect you get right after a flash photo is taken — or afterimages. ... To help use our laser tools safely, the Amateur Telescope Makers of Boston, Inc. has adopted these recommendations as policy. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

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... Minute Values of Geomagnetic Field Components . ... AA 1868 - Present (3 hourly and daily) (monthly) (yearly) (Lists and histograms of geomagnetic disturbance and Solar Sunspots) KP_AP 1932 - Present (3 hourly and daily) (Lists and histograms of geomagnetic disturbance and Solar Sunspots) AE_HV 1957-75, 78-88 (hourly) AE_MIN 1978-881-6;198903;1990-94 (minute) DST 1957 - Present (hourly) PC 1975 - Present (15-minute) AMANAS 1959 - Present (3 hourly and daily) KMKNKS 1983 - Present (3 hourly) . ...

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 . ...

Originally a manually operated photographic telescope, the Uppsala Southern Schmidt (USS, 0.5 metre corrector plate aperture) has been refurbished and modernised. ... This image of omega Centauri shows the central portion of the field. ... Built in 1956 at the Uppsala Observatory workshop in Sweden, the telescope was first located at Mount Stromlo Observatory near Canberra in 1957. ... The Uppsala Southern Station was relocated to Siding Spring Observatory in 1982. ... Siding Spring Survey Main Page . ...