... Up: Data Analysis and Processing Techniques . ... Also, a method for quality control of CCD observations is suggested. ... Everyone who observes a celestial object using a CCD detects moving celestial objects as a ``by product''. ... We hope that our investigations may be useful for near-Earth space control and also for searches of the moving celestial objects through analysis of old and new CCD frames obtained at any amateur or professional astronomical observatory. ...

... 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 . ...

Pulkovo NEO Page . ... NEA Accuracy Estimation . ... The estimation of accuracy of the current CCD observations of asteroids and comets is constantly performed at Pulkovo Observatory. ... The (O-C) values, so called "Observed" minus "Calculated" positions, characterize numerically the observations of any observatory, both professional and amateur, during a short period (one or several close nights). ... So the (O-C) values for these objects nearly entirely define the errors of observations. ...

... Contact A Problem of an estimation of accuracy of the asteroid CCD observations . The Minor Planet Center supported by the Interntional Astronomical Union is the main office for keeping observational data of the small Solar System bodies and their investigations. ... At Pulkovo Observatory we are estimating an accuracy of the CCD asteroid observations obtained by amateurs and professional astronomers all over the World using the MPC database. ...

... Non-disruptive Target of Opportunity Observations Denise C. Taylor and William M. Workman, III December 5, 2010 ABSTRACT This report describes the different scheduling timelines for disruptive and non-disruptive Target of Opportunity observations. ... In that case, in order to be considered as non-disruptive, the observation would be held a week, then included on the next building observing schedule, which would execute June 21-27, 19-25 days after the activation. ...

Estimations of the change of the Sun s mass and the gravitation constant based on high-accuracy observations of planets and spacecraft . ... More than 635 000 positional observations of planets and spacecraft of different types have been used for estimating possible changes of the gravitation constant, the solar mass, and semi-major axes of planets. ... gravitation constant, positional observation, Sun's mass. ...

... R2662 Date Received: 2011-Aug-24 12:55:26 Technical Page Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: We propose three days of S-band radar observations of asteroid 1999 JU3, target of Japan's Hayabusa 2 spacecraft mission, which will return samples from this asteroid in 2020. The only opportunity to observe 1999 JU3 with radar prior to arrival by the spacecraft occurs in October, 2011, at a distance of 0.44 AU. ...

... Programme . ... Its emission is detected from radio to -rays. Despite the fact that Centaurus A is one of the best studied extragalactic objects the origin of its hard X-ray and soft -ray emission is still poorly understood. ... A review of hard X-ray and -ray emission will be given (keV up to GeV) and the contribution of this observations to models of the Centaurus A emission wil be discssed. If no other talk addresses the newly reported emission > 250 GeV, this will be included.) . ...

GRANAT is the Russian x-ray sattelite launched to the high apogee orbit (200,000 km) and operated almost for 10 years (1989 -1999) , carrying out four major instruments: French SIGMA coded-mask hard x-ray telescope (30-1000 keV), Soviet ART-P coded-mask telescope (2??-60?? keV), all-sky monitor WATCH (6-150 keV), and a gamma-burst detector PHEBUS . ... Since September 1994, GRANAT is in the survey mode. ... Explore pages devoted to individual GRANAT instruments (including main scientific results): . ...

... 88, Jan. 1983, p. 1-15. l. A survey of extragalactic radio sources made using driven declination scans is reported covering an area of about 0.07 sr to a limiting flux density of 35 mJy. The fast-scan survey was carried out at a galactic latitude greater than 17 deg with the NRAO 91-m telescope operating at 4.755 GHz, and the 480 sources detected were reobserved at 1.4 GHz with the National Astronomy and Ionosphere Center 305-m telescope at Arecibo. ...

... Old World First Asteroid Radar Echo. ... It testifies that 4179 Toutatis is a double object like asteroid 4769 Castalia. ... Interference of Radar Echo from the Binary Asteroid 4179 Toutatis. ... An analysis of the 6-cm radar data revealed quasi-harmonic oscillation of the echo’s “central” Doppler frequency with a period of about 14 sec and a deviation of about (0.7*B) Hz, where B is the echo bandwidth, which for 4179 Toutatis was equal to 2.1 Hz and 1.9 Hz for 1992 Dec 8 and 9, respectively. ...

... Future seminars . P a s t seminars . ... The Whisper experiment on-board the Cluster mission: multipoint observations on density and wave structures " . ... In a first part, will by present the instrument: functioning, quantity measured, performances, typical observations. In a second part, will be present wave observations in various regions of the magnetosphere, and indicate a few directions of ongoing studies or considered . ... In a third part, will be discussed density structures. ...

We investigate models for main-sequence and horizontal-branch (HB) stars constructed using the Carson opacities and make comparisons with models based on the Cox-Stewart opacities. ... The drop in the hydrogen-shell luminosity due to the helium-core expansion during HB evolution is greater than that obtained with the Cox-Stewart opacities. ... Studies of main-sequence (MS) stars lead to agreement with Stothers' (1974a,b, 1976) results for homogeneous models constructed with Carson opacities. ...

... The analysis shows, that asteroid ­ rubble pile loses its fast fragments in no time but the retaining fragments forms a compact structure immersed in dust ­ gas atmosphere, created by interaction of interplanetary medium with dispersed product of collisional evolution of asteroid. By interaction of an asteroid ­ rubble pile with interplanetary medium structures asteroid can increase its brightness on account of blowed up dust simulating phenomenon of distant comet's brightening. ...

... In order to compare the number of different evolutionary stages obtained and X-ray luminosity of the chosen X-ray sources with the observed galactic values we use the sum of C/O+O/C , where C and O are the calculated and observed values of a given binary type, respectively. If we make comparison for a number of different binary species (for example, we compare the number of CV, number of X-ray pulsars,   total X-ray luminosity of LMXB, etc.), we write this criterion in the form: . ...

Find Similar Abstracts (with default settings below ) . Also-Read Articles . Translate Abstract . ... Spectroscopic and speckle-interferometric observations of the multiple system ADS 11061 . ... 49A Binary star 41 Dra is a member of the hierarchical quadruple system ADS 11061 which includes 41 Dra with a very big eccentricity (e=0.9755). Since 1993 we have performed speckle interferometric observations of the system using the 6-m BTA telescope. ... Abstract Text . ... Query Results . ...

... 3) National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801, USA . ... At 3.6 and/or 6~cm we detect a total of 34 discrete sources, 13 of which are found in five separate extended complexes. ... The fact that, when observed with a compact VLA configuration, the IRAS sources with ``UCHII colors'' are found to be associated with arcminute-scale extended sources, rather than with compact or unresolved radio sources, may have important implications on the estimated lifetime of UCHII regions. ...

Trudy GAISH, vol. LXV, 1996 . Abstracts . The global distribution of average (5 O x 5 O ) depths . of Mohorovicic discontinuity on the Earth . ... Such analysis allows detecting whether the sources of the largest anomalies reside within the Earth's core. This is possible if the limit depths of the sources exceed the depths of the core-mantle boundary. ... by Pasinok S.L. Influence of the Earth’s cover on the polar free oscillation of the Earth’s inner core is considered. ...

Report “Laboratory zero-baseline interferometer tests” (ZBT) was prepared and issued in ASC (35 pages including 17 figures and diagrams in Russian language). ... The Ground-Space radio interferometer (OVLBI) Radioastron includes several space and ground-based segments which are designed and manufactured by different countries and organizations. ... ZBI tests (for OVLBI) were implemented in Russia firstly. The tests were implemented by joint team of ASC, JPL and NRAO in 1999. ...

THE TEMPERATURE OF NONSPHERICAL CIRCUMSTELLAR DUST GRAINS N.V.Voshchinnikov and D.A.Semenov Astronomy Department and Sobolev Astronomical Institute, St.Petersburg University, St.Petersburg, 198504 Russia ABSTRACT The temperature of prolate and oblate spheroidal dust grains in the envelopes of stars of various spectral types are calculated. ... The temperature ratio T_d (spheroid)/ T_d (sphere) depends most strongly on the grain chemical composition and shape. ...