Estimating the NEO Population and Impact Risk: Past, Present and Future . ... Since most of the risk resides in the largest impactors, finding that fraction of the largest bodies, and that none of them has a significant chance of impacting in the next century or so, "retires" more than 90 % of the impact risk, including most of the risk of a globally catastrophic impact event. ... In the mid-size range, from ~150 m to ~1 km, the main risk is from tsunami generated by an ocean impact. ...

... Precisely one month ago, on 11 July 2009, the last active area of the new solar cycle disappeared from the surface of the Sun. Over the 30 days following this, neither observers on Earth nor devices in space have been able to detect the emergence of any sunspots. ... Therefore, it seems that our star has once again returned to a state of deep solar "winter", following several sparks of activity in May-June 2009. ... To date, this period has lasted 30 days. ...

... Bondarko M.V., Vostokov S.V, Zhukov I.B., Additive Galois modules in complete discrete valuation elds// Algebra and Analysis, 1997, issue 4, 2846. ... Bondarko M.V., Vostokov S.V, Isomorphism of ideals regarded as Galois modules of complete discrete valuation elds with residue eld of positive characteristics // Trudy St. Peterburgskogo Matematicheskogo Obsh'estva, vol. 6, 2000, 4251, translation in Amer. ... Bondarko M.V., Z[ p ]-motivic resolution of singularities// Compositio Math., vol. 147, iss....

Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Space Flight . Human Exploration . Robot Exploration . ... ItтАЩs strange how you wait years for an exciting free astronomy app for your iPod/Pad/Phone from Armagh Planetarium and then two of them show up in a fortnight. ... Tweets that mention Spacebrains: new astronomy app from Armagh Planetarium | ... Here you will find the latest news and views from the fascinating worlds of astronomy and space exploration. ...

... The collecting area is increased by nesting concentric mirror pairs, all having the same focal length. ... Figure shows the largest optical element being ground at HDOS. ... X-ray testing demonstrated that the CXO mirrors are indeed the largest high-resolution X-ray optics ever made; the nominal effective area (based on the ground calibrations) is shown as a function of energy in the left panel of Figure , along with those of their Einstein and ROSAT predecessors. ...

... VaST is a software tool for finding variable objects on a series of astronomical images. ... VaST performs object detection and aperture photometry using SExtractor on each image, cross-matches lists of detected stars, performs magnitude calibration with respect to the first (reference) image and constructs a lightcurve for each object. ... VaST FITS image viewer ./pgfv . ... Part I" PZP, vol. ... K. V. Sokolovsky, S. A. Korotkiy; "New Variable Stars Discovered by the NMW Survey" PZP, vol. ...

. english || русский . Main . Location . Telescope . Instruments . Program . Science . Publications . Images . Photos . Links . The following focal instruments are currently available at the telescope: . CCD-photometer . TFOSC -- medium and low resolution spectrometer . ( The page at TUG ) . High resolution echelle-spectrometer in coude focus . High Energy Astrophysics Department 2016 IKI RAN

. | Front page | . | << - Number counts | Contamination - >> | . Robert J. Smith, ">rsmith@mso.anu.edu.au Last modified: Fri Sep 24 11:39:02 EST 1999 .

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