... ARC 3.5m | Weather Closure Conditions . The enclosure will be closed by the Observing Specialist under the following conditions. ... This policy will be consulted whenever there are questions or disagreements concerning closure of the APO 3.5-meter telescope due to hazardous conditions or situations, at times when telescope operations are being overseen by an APO Observing Specialist. ... the on-duty Observing Specialist has full responsibility, and sole authority, to make this decision. ...

... Studies of calibration images have been used to determine an average zodiacal light intensity of S10 = 191 units and a detector background for the new F/96 relay of B p = 6 \Theta 10 \Gamma4 and for the new F/48 relay B p = 2 \Theta 10 \Gamma3 counts s \Gamma1 pixel \Gamma1 . Figure 41 shows the predicted exposure time in seconds needed to reach a S/N = 10 for a specified visual magnitude of a B5V star through the F342W (U) filter for the two cameras. ... 18 20 22 24 10 100 1000 Figure 42. ...

DISCLAIMER: The larger the aperture, the more light a telescope will gather and the fainter the object you can see. Here is a range of magnitudes you might expect to see. Given excellent sky conditions and good optics, a well trained eye can sometimes add up to 0.8 magnitude to these values. Limiting Magnitude depends on much more than the instruments aperture. ... One formula is for aperture in inches the other is for aperture in millimeters. ... Aperture (inches) . ... 15.2 . ...

... The IAA's Observing Night + Leonid Watch at Delamont Country Park on Saturday night started well, following a good weather forecast, with crystal clear skies very little light pollution. ... But ever the optimist I set the alarm for 03.45 to allow time to get up out to a dark site if it did clear. ... The Leonids were spectacular - I had almost forgotten just how fast they are: even one streaking halfway across the sky takes less than 1/4 second! ... Clear Skies, Terry Moseley . ...

Statistics of sunspot activity . The sunspot indices . ... NGDC's observations . The solar regions . ... Average annual indices . ... November . ... November, 2013 . Visual indices of solar activity by National Geophysical Data Center . ... Average . ...

... Science Users Information > Observing with ESO Telescopes > Phase 2 Preparation > Observing conditions . ... Service Mode Philosophy . ... The following definitions of the observing conditions are common between Phase 1 preparation and Phase 2 preparation, as well as between Service Mode and Visitor Mode observations. ... There are additional Service Mode Policies and Service Mode Guidelines regarding the observing conditions. ... Seeing (Phase 1) and Image quality (Phase2) constraints . ... Moon . ...

... 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?. ...

... GCN 8471 | ... TITLE: GCN CIRCULAR NUMBER: 8516 SUBJECT: GRB 081102: MASTER refind and final results DATE: 08/11/11 15:50:10 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.Parkhomenko Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalognikh Ural State GCN Circ 8470, Lipunov et al., ...

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. ...

Last modified: 23 October 1999 . ... V codes are for AO1 experiments W codes are for AO2 experiments VS experiment codes are VSOP Survey Observations VT Test/Calibration Observations ------------------------------------------------------------------------ EXPNO SOURCE FRQ Corr DOY DY: DATE UT RANGE #TEL TELESCOPES W027a4 J1927+73 C Socr 311 Su:Nov-07 20:00 - 06:00 11 VLBA EB V330b W066b2 J0841+70 C Socr 312 Mo:Nov-08 15:00 - 23:00 10 VLBA V030j W044b1 J0808+49 C* ...

ATMoB "Open Cluster Observing Award " Guidelines Purpose: To promote observing among the membership of the Amateur Telescope Makers of Boston through participation in the Open Clusters Observing Awards program. Introduction: This awards program is oriented towards visually observing open clusters above magnitude 9.9. ... It turns out that a very unprejudiced and convenient method to dermine the limiting magnitude is to count the number of visible stars in certain areas on the sky. ...

This section of AMPLE provides a means for identification of minor planets. ... Due to special organization of the package, AMPLE permits the identification to be reliable fulfilled THROUGHOUT the TITLE YEAR. ... In such cases the result of identification depends on where the nearest opposition of inspected planet is situated, within basic interval lasted from November of preceding year to February of subsequent one or without it. ...

... Sun images . Magnetic storms online . Sun flares . ... November : 2010 . ... X-ray emission of the Sun from 08.11.2010 to 09.11.2010 (GOES-15) . No solar flares of C, M and X-class were observed today . No solar flares of C, M and X-class were observed yesterday . Last updated: November 10, 2010 00:00 UT . ... 1953-2016 Laboratory of X-ray astronomy of the Sun, LPI RAS, Russia . ... 7(499)132-65-96, Fax: +7(499)132-65-97 . ...

... Seidewand created the event FREE WEEKLY TELESCOPE VIEWING AT STRASENBURGH PLANETARIUM: 4/2 cancelled for clouds, snow, . ... Free! ... Call Jim at 703-9876 for more info. 1 week ago . ... Seidewand created the event FREE TELESCOPE VIEWING AT STRASENBURGH PLANETARIUM . ... Seidewand created the event FREE TELESCOPE VIEWING AT STRASENBURGH PLANETARIUM: 3/26 outlook is hopeful . ... Seidewand created the event FREE TELESCOPE VIEWING AT STRASENBURGH PLANETARIUM: 3/19 outlook is excellent . ...

... At the Limit of Diffraction . ... Credit Copyright: Yuri Beletsky ( Las Campanas Observatory , Carnegie Institution ) Explanation: Did you ever want to just look through the eyepiece of a large telescope in space ? If you could, you would see a sharp view that was diffraction limited . ... Still, in this working earth-based snapshot a new active adaptive optics system (MagAO) is being used to cancel out the atmospheric blurring in a visual observation of famous double star system Alpha Centauri . ...

... In this activity, students will observe that the faintest stars which they can see in the sky are affected by many things: the adaptation of their eyes to the dark, the presence of clouds or haze, the time of year, and the presence of light pollution. General Information . ... After completing this activity, students should have a better understanding of the practical processes for dealing with the light pollution problem and with other environmental and societal issues. << previous page | ...

Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 12 - 18.11.2012, Forecast on 19 - 26.11.2012, Carrington Rotations 2130 (04,86.11.2012) SUNSPOT-FORMING ACTIVITY OF THE SUN WAS REMAINED ON THE AVERAGE LEVEL. ... FLARE ACTIVITY WAS AT THE HIGH LEVEL ON NOVEMBER 13, THE AVERAGE LEVEL ON NOVEMBER 12 AND 14 AND THE LOW LEVEL - 15 - 18.11. BY DATA SOHO AND STEREO CORONOGRAPHS WAS OBSERVED BY 49 CME ONE OF WHICH WAS THE "PAR- TIAL ГАЛО III" TYPE AND 3 - THE "PARTIAL ГАЛО II". ...

... NOTE 2: There is NO warning in CIMA if the current source goes outside the allowed ZA range--the telescope will just silently stop tracking the source when it has reached the ZA limit. ... A 'CIMA Observing Menu' window will open. ... Click on 'Backend Control' in the 'CIMA Main Menu' on the left. ... After the telescope has slewed to it, in 'CIMA observing menu' click 'Observe' (if this is buried below a mass of windows, you can bring it up by clicking 'Pulsar Observing' in the 'CIMA Main Menu'). ...

... In 1976, Polyakov (1976) predicted the existence of ionospheric AlfvИn resonator (IAR), equivalent to the ionospheric waveguide , but operating in vertical direction with shear AlfvИn waves . ... Belyaev, P. P., S. V. Polyakov, V. O. Rapoport, and V. Y. Trakhtengerts, The fine structure of the radiation of an AlfvИn maser, Geomagn. ... Belyaev, P. P., S. V. Polyakov, V. O. Rapoport, and V. Y. Trakhtengerts, The ionospheric AlfvИn resonator, J. Atm. ... Space Physics Text Book of Oulu ...

... 2004 November 14 . Leonids Above Torre de la Guaita . ... Explanation: The 1999 Leonids Meteor Shower came to an impressive crescendo. Observers in Europe observed a sharp peak in the number of meteors visible around 0210 UTC during the early morning hours of November 18. ... Visible are at least five Leonids meteors streaking high above the Torre de la Guaita, an observation tower used during the 12th century in Girona, Spain . ... About APOD | ... NASA Official: Jay Norris. ...