... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Problems posed by massive stars . ... These questions were at least part of the motivation when CУЕssio Barbosa of Brazil's University of SУ?o Paulo and Donald Figer of the Space Telescope Science Institute in Baltimore surveyed observers and theorists to see what they believed were the most pressing problems concerning massive stars. ... Get instant access to subscriber content on Astronomy.com! ...

The problem of turbulence is one of the most important and challenging problem of the modern science. ... An experimental investigation of turbulent flows with special experimental setup and equipment, which allow to obtain reliable data with good precision, is very difficult and expensive process. ... The natural assumption for the theory of turbulence is that there exist some (unknown yet) general and universal properties for wide range of different turbulent flows. ...

Telescope Jumps: One Cause is Found . ... One tries to take out the sag of the secondary cage as the telescope is pointed toward the zenith. The second component tries to take out changes in the secondary piston caused by temperature changes of the truss structure. ... Second, the jumps only occur when the temperature data causes motions of the piston which go in a direction opposite to the direction in which the sag component is driving the secondary. ... One has to wonder how this can occur. ...

This page could be summarized with the statement: don't require Apache to use DNS for any parsing of the configuration files . ... In order for Apache to function properly it absolutely needs to have two pieces of information about each virtual host: the ServerName and at least one IP address that the server responds to. ... use IP addresses in Listen . ... In any event it doesn't seem possible to reliably boot a virtual-hosted web server when DNS has failed unless IP addresses are used. ...

... About ATMoB . ... The Observing Committee is starting an Observing Awards Program to promote observing among the membership of the Amateur Telescope Makers of Boston. ... Participant must be a current member of the Amateur Telescope Makers of Boston . ... To qualify for your Observing Award Certificate, turn in your worksheet and drawings to an ATMoB Observing Committee member or observing@atmob.org . ... This Excel sheet has useful macros. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... Mosaicing may be used in aperture synthesis to map large fields of view. ... A CLEAN-based method has been developed, in which the components are located in a modified expression. ... Mosaics . ... We present here a CLEAN-based method for the mosaic deconvolution. ... This is a basic problem in mosaic deconvolution: if we intend to apply CLEAN on , the risk of taking a noise peak as a CLEAN component is too important. ... A new CLEAN-based algorithm for mosaic deconvolution has been developed. ...

... 8, ``Celestial Mechanics'', 2002 Parameterization of the Solar Radiation Pressure model for GPS satellites I. S. Gayazov Institute of Applied Astronomy, St. Petersburg, Russia The treatment of solar radiation pressure (SRP) effect until now is the main problem in precise modeling of GPS satellite orbits. ... In practice, however, all seven parameters of the empirical model cannot be confidently determined from phase observations. ... BarґSever Y. E. A new model for GPS yaw attitude. ...

... Radio Astronomy . ... ASRAS Board Members . ... To see the most up to date news and events happening with ASRAS log in with your user name and password and then click on the Activities page. ... Messier Marathon (Member Observing) CANCELLED Saturday, April 9, 2016 9:00 PM Location:Farash Center Ionia NY . ... ASRAS Members meeting - Friday May 6 at Farash Center - Ionia NY . ... ASRAS Board members meeting - monday May 9 @ Farash Center Monday, May 9, 2016 7:00 PM Location:Farash Center Ionia NY . ...

... Corporation . OAO RSC Energia . President of the Corporation . ... Brief History of Rocket and Space Technology . ... Space Station MIR . ... Space Records . ... Image . ... Contribution of RSC Energia to the Russian Space Technology . International Space Station . Project History . ... First Crew . Required Resources . ... Images . ... Second Crew . ... First Russian Visiting Crew . ... Third Crew . ... Fourth Crew . ... Rockets . ... Official WEB-site of S.P.Korolev RSC Energia . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... astronomers . ... Space Flight . ... Science Fiction . UFOs and Fringe Science . ... Amateur Astronomy is a fascinating and reward?нing hobby, enjoyed by people from all walks of life and all ages. ... As far as I know none these people are amateur astronomers, however there are some celebri?нties who are genuinely into astronomy. ... Amateur astronomers do seem to have an image problem. ... Subscribe to Astronotes . ...

... The choice of the spectrograph design (Fig.2) is determined by the quantity R, the overall dimensions of the PF cage and the restrictions on the rigidity of the structure of the device. ... As the camera's objective a fast 4-lens aplanat is used having a focal distance F cam =140 mm and a relative aperture of 1:1.8, the resolution at the centre is no less than 80 gr/mm, that over the field at a distance of 3 mm from the edge along the frame ( ) diagonal is 35 gr/mm. ...

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 | ...

Next: UNSOLVED PROBLEMS Up: OTHER HYDROGEN-DEFICIENT STARS Previous: Carbon stars . During the past century, three stars have been observed as being both hot subdwarfs and RCB stars at different times. V605Aql is now the hydrogen-deficient central star of a planetary nebula (Abell58). ... In 1996, an unremarkable faint blue star suddenly brightened and within three years had become a very cool and luminous carbon star, now known as Sakurai's Object or V4334Sgr ([ Nakano et al. ... 1999 ]). ...

In this chapter we will consider an example of visual expert system written on the Actor Prolog language. ... There are a lot of methods of oil field bed stimulation that increase output of the oil production: thermal, physical-chemical, gas, microbiological, and others. ... Fig. ... The Top-Most diagram consists of three blocks: the "Describe parameters of hydrocarbon field" block, the "Check adaptability of existed methods of oil production" block, and the "Display solution" block. ... Gas methods. ...

General Forum Message . ... The Rules Of The Universe . ... Once we know how to unlock the cosmic order, most of our daunting problems are solved. ... The rules are simple, but we can not see them ? it requires the genius of an Einstein coupled with the logic of a Kasparov to know the rules of this Universe. ... It is a combination of modern physics, mathematics, logical order and intuitive ability that one requires to know the rules of our Universe. ... www.astronomy.net . About Astronomy Net | ...

... Proof of the Dulac's conjecture: Polynomial vector field in the real plane has but a finite number of limit cycles. The proof of this short statement requires a book [44] published by AMS in 1991; it was the subject of the talk in the ICM-1990. ... The proof of the same conjecture given by Ecalle and based on the ideas of the four authors appeared in a book published in 1992. ... Generation of limit cycles under perturbation of planar Hamiltonian systems. ...

... Advises . Contact Advises . As an advise for amateurs we would like to underline: if it's possible, try to observe 3 asteroid positions per night and do not neglect to observe the Numbered Minor Planets in your telescope field of view as a "by product" of your observational programs. ... We think such estimations ought to be produced every morning after CCD observations of the moving celestial objects by observer himself. ...

... Exposure Time Calculator (ETC) . Survey processing . ... VISTA is a 4-m class wide field survey telescope for the southern hemisphere, equipped with a near infrared camera (1.65 degree diameter field of view at VISTA's nominal pixel size) containing 67 million pixels of mean size 0.34 arcsec and available broad band filters at Z,Y,J,H,K s and a narrow band filter at 1.18 micron. A wide field visible camera, if constructed, could also be used on VISTA. ... Tile . ... ESO VISTA Public Surveys . ...

... Currently, there is very little information on comets which are active beyond the orbit of Jupiter. ... Previous observations conducted by our team with the SAO RAS 6-m telescope showed that some of these comets have extended tails dissimilar to the tails of comets forming at close heliocentric distances. ... We for the first time measured the linear polarization of scattered emission for the two distant comets C/2010 S1 (LINEAR) and C/2010 R1 (LINEAR) at heliocentric distances of 5.9-7.0 au. ...

Ilya M. Chertok . A researcher of the Solar and Solar-Terrestrial Physics . ... by I. M. Chertok, A. V. Belov, V. V. Grechnev . ... by Chertok I. M., Grechnev V.V., and Meshalkina N.S. Astronomy Reports , Vol. ... Solar Events of October-November 2003 by IZMIRAN Radio Observations , . ... by I.M. Chertok, V.V.Grechnev, H.S. Hudson, and N.V. Nitta. ... by Chertok I.M., Fomichev V.V., Gorgutsa R.V., and Sobolev D.E. Ї Slowly Drifting Fine - Structure Radio Continuum of 4 April 2001 , by Chertok I . ...