... 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. ...

Cherechukin A.A., Koledov V.V., Shavrov V.G., Tulaikova A.A., Vasil'ev A.N. Magnetic and structural phase transitions in Ni2+УMn1-УGa (0<У<1) alloys are investigated experimentally. The martensite domains formation under the action of external magnetic field on the surface of polycrystalline Ni2,19Mn0,81Ga specimen was investigated by optical method. ... It is found that the martensite phase formation temperature is enhanced by the order of 0,3 K in magnetic field of 1 kOe. ...

... Direct data transmission rate (Mbps) . ... the density of electron fluexs with energies in four bands from 0.04 MeV to 1.7 MeV; . ... sensor (TV, IR) data and heliogeophisical information (HGI) transmission to data receiving and processing centers at a rate of up to 2.56 Mbps; . ... 1.76 GHz - TV- and heliogeophysical information and DCLI's data transmission to data receiving and processing centers; . 7.5 GHz - TV- and heliogeophisical data transmission to data receiving and processing centers; . ...

Next: Discussion Up: Other Stars Previous: Stars with Less . While periods were detected on 59 of 105 stars monitored only 12, ten in Orion OB1a and OB1b plus TAP 26 and P1724, had detections with FAP's below 1%. This seems consistent with results from the Van Vleck Observatory. ... The Van Vleck Observatory has reported periods for 75 stars (Choi & Herbst 1996) and variability has been seen in 186 stars (Attridge & Herbst 1992) over four years. ... Thu Dec 5 13:29:36 EST 1996 ...

Dynamical chaos in the problem of magnetic jet collimation O. Yu. ... In the paper of Bisnovatyi-Kogan (2007) magnetic collimation resulting from torsional oscillations of a cylinder with elongated magnetic field and periodically distributed initial rotation around the cylinder axis was considered. ... Space and time periods of oscillations depend on the conditions of jet formation: the length-scale, the amplitude of the rotational velocity, and the strength of the magnetic field. ...

Once students get the hang of it, they can find and measure the brightness of Delta Cephei in a few minutes. ... of Delta Cephei . ... Oct. ... The following table lists the measurements of Delta Cephei made by one amateur astronomer in autumn 1990. ... 4.0 . ... This activity is a simplified version of one that appeared in Hands-On Astrophysics, a series of activities prepared by the American Association of Variable Star Observers with support from the National Science Foundation. << previous page | ...

... the radiative transfer equation (RTE) for the randomly-irregular magnetized plasma has been derived on the base of general grounds of the multiple scattering theory . ... Solutions of several absolute tasks of the scattering theory have been obtained (on the optical depth of the ionospheric plasma layer, on the value of radio wave anomalous attenuation, on anomalous refraction, on the backscattered signal intensity for the source being placed within a plasma layer). ...

The technical memorandum: Time and Time Interval Measurement with Application to Computer and Network Performance Evaluation (PostScript) describes a number of techniques for conducting experiments typical of computer network and transmission systems engineering. ... The usual data collected during a performance run of some experiment might include time offsets, time delays, frequency offsets and various error statistics. ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Astrophysics graduate student programs . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ...

ENERGOSPECTROMETER OF IONOSPHERIC PLASMA P3-3 . ... The major objective of the P3-3 experiment is complex investigation the main parameters of ionospheric plasma with high time and spatial resolution. ... Measured parameters: . ... The experiment produce regular data - measured with fixed time interval and «packet» data - measured once per specific time interval and producing blocks of TM-information. ... If all parameters will be measured once per second, the experiment will produce 10 MB per orbit. ...

. I will briefly summarise the methods to estimate the magnetic field strengths of different types of neutron stars and the caveats associated with them. In this context I will present some recent results we have obtained in finding the limits to the field strengths of accreting millisecond X-ray pulsars from the interaction between the accretion disk and neutron star magnetosphere.

... Be Stars . ... Magnetic Stars . ... Magnetic fields in stars are common. ... The earliest star known to have a magnetic field is the O-star 1 Ori C, one of trapezium stars in the central cluster of the Orion nebula of spectral type O6. ... The non-existence of more rapidly rotating magnetic stars was thought to be an immediate consequence of the magnetic field: The field would help the star to get rid of angular momentum by forcing the wind into co-rotation, and so to brake down the star. ...

... Using the CFBDSIR wide field survey for brown dwarfs, we identified CFBDSIRJ214947.2-040308.9, a late T dwarf with atypically red J-Ks colour. ... SN 2009ip in NGC 7259 Electronic Telegram No. ... 7.09, [19.0; 2009 Aug. ... Accepted for publication in MNRAS Subjects: High Energy Astrophysical Phenomena (astro-ph.HE) The jet opening angle theta_jet and the bulk Lorentz factor Gamma_0 are crucial parameters for the computation of the energetics of Gamma Ray Bursts (GRBs). ...

Follow-up observations with the University of Washington 0.76 m telescope at Manastash Ridge Observatory (MRO) of the Sloan Digital Sky Survey (SDSS) cataclysmic variable (CV) SDSS J170053+400358 are presented. ... They estimate that the dimming amounted to about 0.028 mag (using two comparison stars that were each about 4 mag fainter than HD 209458). only UW affiliated authors have been listed, student researchers are marked with an ``*'' . ... XTE J1859+226" UW affiliated authors: *Kevin Krisciunas. ...

... It was found in this way that the radio variations (5 MHz) followed the optical ones, but that the time delay was a linear function of time with the mean value being about 2370 days and with the rate of increase days/year. ... We take days/year as the test value. ... To show that the method has real abilities to determinate a value of of the time delay rate of increase in the light curves we again use Monte-Carlo simulation as it is explained in (1) and (2), but the actual value is 110 days/year. ...

V, K: As a rule, V magnitudes are from the Simbad database, if source is variable the maximum is shown. ... For what concerns K magnitudes, they also are extracted from the Simbad database unless one of the following suffixes is present: a) the magnitude is an estimate obtained for the typical V-K of the given spectral type; b) estimate derived from the signal level during the occultation event; c) photometric measurement shortly preceding or following the occultation event. ...

... A complication to transforming from CHIPCOORD to sky coordinates is that the spacecraft attitude is never completely fixed, thus the exact transform varies with time. ... Each chip image is subjected to multiple transforms, one per attitude bin; the output image consists of a weighted sum of these transformed images, the weights being proportional to the duration of each attitude bin (but see also section 3.2 below). ... It may for example be unwise to make OOTE sky maps this way. ...

... Sun images . ... September : 2013 . ... Image of Sun's chromosphere obtained 09.09.2013 at 07:12 UT in Kanzelhoehe Solar Observatory (Austria) . ... Image of Sun's photosphere obtained 09.09.2013 at 23:47 UT with HMI instrument on board SDO spacecraft . ... Image of Sun's magnetic field obtained 09.09.2013 at 23:47 UT with HMI instrument on board SDO spacecraft . ... Image of Sun's transition region obtained 09.09.2013 at 23:39 UT with AIA instrument on board SDO spacecraft . ... Image of solar wind...

... SHORT TERM PREDICTION OF POWER SOLAR FLARES FROM SSRT DATA . The algorithm for short term prediction of powerful solar flares, based on SSRT data, includes microwave emission characteristics in total and polarized flux, the structure of active region (AR) magnetic field at the photospheric level, and H a patrol data. ... During this period, 7 AR's crossed the solar disk, in which 20 flares of importance ? ... Data on AR's and magnetic fields were received from the Sayan observatory by teletype. ...

Determination of the orbits and estimation of the masses of ADS 7251 and ADS 5983 ( Gem) Natalia A.Shakht, Elena A.Grosheva, Denis L.Gorshanov. ... For ADS 7251 we have used the observations of W. and O. Struve 1821­1878 years (see Fig. ... In the motion of ADS 5983 our astrometric observations have been shown perturbations with period from 5.6 to 6.1 years, which are repeated during all interval of observations and assumed the presence of unseen component with low limit of the mass equal to 0.2 M . ...