adapted from Observe: Eclipses, published in 1979 by the Astronomical League and "Safe Solar Filters," by B. Ralph Chou, Sky and Telescope, August 1981) . ... Tape TWO pieces of film together into a sandwich, and tape this over the opening in the cardboard. ... The cardboard frame will act as a shade from the bright Sun, while you safely observe through the film sandwich. ... Undeveloped film is not safe. ... tape . ... At the end of one of the tubes, tape the aluminum foil, and make a tiny pinhole. ...

System Throughput and SNR / Exposure Time Estimation . The presence of significant red leaks in the UV filters, together with the much greater sensitivity and wavelength coverage in the red part of the spectrum, can make UV observation and calibration difficult. ... The counts contributed by red leak can be a significant noise source, and must also be taken into account during SNR and exposure time estimation. ...

Next: Pressure Up: Additional information Previous: Additional information . ... Although the ESO Archive standard is to record temperatures in kelvins, this is often inconvenient. ... Therefore, if the temperatures are not in kelvins, the appropriate units should be provided in the table file (if temperatures are in a column), or as a comment. ... If filter and detector temperatures are otherwise regulated or recorded, it may still be useful to record DOMETEMP in the data file as a Real*4 column. ...

Peremennye Zvezdy ( Variable Stars ) 26 , No. ... Moscow 119992, Russia . ... 84/32, Moscow 117997, Russia . ... Our CCD observations compared to times of minima derived from the archival photographic plates and from the NSVS and ASAS-3 data clearly show that the orbital period of the system is variable. ... The phased light curve for the light elements . ... CCD, Moscow . ... and for the current linear light elements (in excellent agreement with the NSVS, ASAS, and our CCD observations): . ...

... Parameters . Filters . ... Direct images . ... The SCORPIO-2 project: . Spectral Camera with Optical Reducer for Photometric and Interferometric Observations - 2 . The broad-band glass filters made in SAO RAS are used for the observation in the Johnson-Cousins (UBVRI) photometric system in the direct images mode. The glass filters transmission curves are shown by solid line. ... The filters transmission curves of the `comets' filters measured with the SCORPIO-2 in the F/4 beam. ...

m31 _B_00098_df.fits TARGET = ' M31 ' / target EXPTIME = 100 . / exposure time (seconds) FILTER = ' (2) B (375-490)' / filter DATE-OBS = ' 2012-11-22T00 :40:42.618' / date of observation (UT) m31 _B_00099_df.fits TARGET = ' M31 ' / target EXPTIME = 100 . / exposure time (seconds) FILTER = ' (2) B (375-490)' / filter DATE-OBS = ' ...

... Обзор LPR фильтра. Впечатления от наблюдений с LPR фильтром. ... Характеристики цветных фильтров Baader-Planetarium . Мой перевод pdf- файла о фильтрах с сайта Baader-Planetarium (379 кб) . ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Lightcurve of HW Vir from images obtained using the Faulkes Telescope South, operated by Las Cumbres Observatory . The blue triangles show the difference between two stars whose brightness is constant. ... This shows the value of the Faulkes Telescopes in the follow-up observations of eclipsing binaries with the aim to detect and characterise additional circumbinary companions. ...

STEP INTO THE BLUE - MEADE INSTRUMENTS PRODUCT GUIDE . ... Products . Telescopes . LX850 Series . ... Coronado€о Solar . ... H-Alpha Filters . ... Blocking Filters . ... Coronado 5mm Blocking Filter . ... Blocking filter for Coronado primary filters . ... Coronado BF-5 right angle (1.25" diagonal) type secondary blocking filter. The blocking filter is the second element in any Coronado H-alpha system, it is just as crucial to your safety and the system's performance as the front element. ...

... Solar Eclipses in 2009 : . There are two eclipses of the Sun (an annular eclipse on January 26 and a total eclipse on July 21-22 ) in 2009. ... Annular Solar Eclipse . ... Annular Eclipse of the Sun on January 26, 2009 . ... Beginning of northern limit of umbra . ... Beginning of center line; central eclipse begins . ... Central eclipse at local apparent noon . ... Total solar eclipse . ... An annular eclipse occurs when the apparent disk of the Moon is smaller than that of the Sun. ... Umbra: . ...

... The March 20 total solar eclipse was visible over the North Atlantic and Arctic Oceans. ... Solar eclipses are of interest for radio astronomy, as they make it possible to observe individual details on the solar disc (spots, filaments, flocculi, etc.) ... On March 20, 2015 the integrated observations of the solar eclipse were carried out at the RATAN-600 radio telescope at 70 wavelengths simultaneously in the range of 1.65cm to 10cm with the 1% frequency resolution. ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Australia Telescope Online Archive (ATOA) . ... Parkes | ... Australia Telescope 20GHz Survey . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ...

Next: AXAF Recipes Up: ROSAT HRI Recipes Previous: Quantum Efficiency Correction (a.k.a. For some observations, a significant amount of data may have been rejected during SASS processing because the background level was higher than the calculated threshold for rejection. ... REJECTED EVENTS . ... The recipe will allow the user to include rejected events in the generation of a new qpoe file and filter on the background level. ... This creates a qpoe file with standard + rejected events. ...

... Two additional extensions contain the polynomial coefficients describing the distortion for all the filters. FILTER-U . ... Each extension FILTER-FilterId holds a binary table sampling the detector distortion of a specific filter at a coarse resolution ( 1 datapoint every 25 subpixel). ... The filter element is found in the column FILTER_ID. The required binary table entry is identified by matching the value of the column FILTER_ID with the State Variable FilterID. ... not applicable . ...

RTT150 . Russian-Turkish 1.5-m Telescope . ... Until 2002 observations were mostly performed with ST-8E CCD in the 1:7.7 Cassegrain focus. ... In April, 2003 telescope was equipped with a larger-size CCD Andor DW436 . ... 2048 x 2048 pixels, . ... Since summer of 2002 the main focal detector of the RTT150 telescope was AP47p CCD in 1:7.7 Cassegrain focus. ... During September 3-13, 2002 works on installation of new autoguiding system ( photo 1 ) were carried out on RTT150 telescope. ...

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 . ...

... ARCSAT ID NUMBER: AS09 DESCRIPTIVE TITLE: Monitoring H-alpha Variability in Be Stars in Young Clusters PI: Steven Souza (Williams College) OBSERVER(S): Steven Souza UNCERTIFIED/UNTRAINED OBSERVERS: summer research students Hallee Wong (Williams College '18), Aylin Garcia Soto (Wesleyan University '18) COLLABORATORS: none CONTACT INFORMATION: Steven Souza; ssouza@williams.edu; 413-441-9892 TIME REQUESTED: My request is for one week total during Q3. ...

... Tonight's Sky . ... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Filtered solar views . ... With the range of filters and telescopes available for solar observing these days, we have never had a better opportunity to safely observe the Sun from the comfort of our backyards. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Observations have received at the telescope AT-64 of the Crimean Astrophysical Observatory . GRB . ... RA(2000): 11h 45m 10.54s . DEC(2000): 17o 24' 34.44" . ... Filter: none . ... Date, time (UT) . Exposure . ... 2000.07.29 18:21:52 . 30 sec . ... RA(2000): 19h 58m 19.61s . DEC(2000): 23o 32' 35.15" . ... 120 sec . ... DEC(2000): 6o 20' 47.07" . ... 240 sec . ... DEC(2000): 51o 46' 34.93" . ... DEC(2000): -13o 04' 30" . ... DEC(2000): +55o 18' 25.0" . ... 2000-11-09T16:03:19 . ...

Astronomy Discussion Forums . ... Total Lunar Eclipse May 15-16 . ... Post Message | ... A total Lunar Eclipse. On the night of May 15-16 the Earth will come between the Sun and the Moon casting a shadow that will slowly cover the Moon. ... The last total Eclipse was on a day where it snowed 10? all day. ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...