... Low Polar Orbit . ... Different types of satellite orbits have different uses: while the synchronous orbit is best for communication satellites, Lagrangian point orbits help monitor the solar wind before it reaches Earth. ... Many spacecraft use such orbits, e.g. the US Air Force surveillance satellites of the DMSP series, or the series of French Earth-resources spacecraft SPOT . ... If the satellite then starts near a noon-midnight orbit, it will always pass near noon and near midnight. ...

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• Magnetospheres other than Ours
• FAQ: "The Great Magnet, the Earth"
• Trapped Radiation

... The greater the distance, the smaller the parallax. ... That triangle has the same proportions as the much larger triangle ABC, and therefore, if the distance B'C to the thumb is 10 times the distance A'B' between the eyes, the distance AC to the far landmark is also 10 times the distance AB. ... The most distant objects our eyes can see are the stars, and they are very far indeed: light which moves at 300,000 kilometers (186,000 miles) per second, would take years, often many years, to reach them. ...

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• Polar Orbiting Satellites
• Magnetospheres other than Ours
• Trapped Radiation

... May 13, 1997 . Optical Transient Near GRB970508 Shows Distant Redshift . ... Explanation: The GRB distance scale controversy may have just ended with a flash . ... Most importantly, continued scrutiny showed that this optical transient had absorption lines with a redshift of about 0.8 - the distance scale of galaxies and quasars . ... Above is a "negative" image of the GRB970508 field , located near the north celestial pole, taken hours after the initial flash of gamma rays. ... About APOD > . ...

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• APOD: 2013 December 5 - Planetary Nebula Abell 7
• APOD: 2001 February 22 - 3C294: Distant X Ray Galaxy Cluster
• APOD: 2002 March 19 - Breaking Distant Light

... Magnetic fields, subatomic particles, etc., traveling in different directions fill the universe. Do they deflect or otherwise affect one another? If so, isnт??t the information we get from them distorted? ... Neutrino astronomy, which is still in its infancy, is attractive because neutrinos interact so weakly with matter that few of these distorting effects occur. Get instant access to subscriber content on Astronomy.com! ...

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Optical Filters . The polarizer quads were also designed to map onto a four-faceted WFC configuration and, consequently, also require a partial filter rotation of -33 degrees to move the filter quadrant 1 (nominal polarization angle 135 degrees ) into WFCs 2 and 3, with some vignetting of both camera fields. Several additional partial rotations have been added to allow observations with different polarization angles on the same CCD. ...

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• Andy Fruchter's Homepage
• HST this week: 061
• Polarization Observations

... IRAF View . This is the orientation of the image as viewed in an image display via IRAF (e.g. ximtool, saoimage). Note: This is different from the orientation of the image as viewed on a Macintosh, via Remark . ... A +X, +Y instrument offset will move a star in the direction indicated by the arrows. ... Note: The offset direction depends upon which interface the offset command was issued in! ... Note: This is different from the orientation of the image as viewed by IRAF. ...

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• TUI:Telescope:Offset Types

... Neptune in Infrared . ... Neptune is the eighth most distant planet from the Sun, thirty times the Earth-Sun distance. ... The Magnetic Carpet Of The Sun . ... Its visible surface appears to be carpeted with tens of thousands of magnetic north and south poles joined by looping field lines which extend outward into the Solar Corona. ... NGC 2261: Hubbles Variable Nebula . ... Earth's North Magnetic Pole . ... A magnetic compass does not point toward the true North Pole of the Earth. ...

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... What is necessary for the CPR search is a distant source of polarized radiation for which the polarization angle at the emission can be safely predicted and then compared with the observed one. ... Table 1: A summary of CPR searches Experiment R R R R C C C C C CPR angle Бstat (Бsyst) Frequency or Distance 3.6 cm ~1300Х ~3000Х ~1300Х 145 GHz 100-150 GHz 100-150 GHz 23-94 GHz 95-150 GHz <z>=0.78 <z>=2.80 z=0.811 <z>=2.80 z~1100 z~1100 z~1100 z~1100 z~1100 Direction Reference esolved RG radio pol. ...

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• http://www.arcetri.astro.it/~palla/ANDREAIMMAGINI/Galassie/0104a-b-c.txt
• http://www.arcetri.astro.it/~sperello/JENAM2010.pdf
• The Face on Mars

Classroom Activity: Pinhole Protractor Gene Byrd and Renato Dupke . ... We cannot directly perceive the distances or sizes of far-away objects. Instead, our eyes only detect the angular size of objects. ... In Part II, which will appear in a future issue of The Universe in the Classroom, students will see how astronomers use parallax -- an extension of binocular vision -- to determine the distances of stars in the Sun's neighborhood. ... distance = 57.3 x physical size angular size (in degrees). ...

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• ASP: An Ancient Universe - Changes in the Universe
• ASP: To Every Season There is a Reason
• ASP: Good Astronomy Activities on the WWW

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. ...

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... Computing the pointing error . ... The platform can be rotated by pulling on the tie downs or redistributing weight on the platform. ... The horn rotates through the same angle as the platform. ... The plots show the computed pointing error for different platform rotation angles (.ps) ( .pdf ): . This shows the pointing error in as you tilt the platform. ... B2209+080 has the pointing errors with no tilt. ... The computed pointing error for a platform tilt track the measured errors pretty well. ...

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• alpaca: rfi tests with fat dipoles
• Planetary Radar: Arecibo Radar Images of Asteroids

Next: A Universal Diagram for Up: ``Ecology'' of Magnetic Rotators Previous: The Corotation Radius . The interaction of a magnetic rotator with the surrounding plasma to a large extent depends on the relation between the four characteristic radii: the stopping radius, , the gravitational capture radius,   , the light cylinder radius,   , and the corotation radius,   . ... Hence, the classification of the interaction regimes may well mean the classification of magnetic rotators. ...

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• E-P transitions for different orbits
• Gravitational waves from supernova explosions
• ``Ecology'' of Magnetic Rotators

Scale-heights of the Galactic disk subsytems with different ages and metallicities . V.Marsakov & Yu. ... It is based on the fact, that all stars cross the disk plane several times during their Galactic orbital period. ... We have used our representative sample of nearby disk F2-G2 stars Marsakov & Shevelev (1995) in which fundamental stellar parameters was determined on the basis of published date on uvby-photometry, proper motion and radial velocities. ... Marsakov V.A., Shevelev Yu.G. Bull. ...

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• Scientific Directions Achievements
• Vladimir Marsakov Abstracts

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• Astronomy HyperText Book: Stellar Clusters

. Album : Фотоальбом Сергея Аюкова :: Travels to distant places and countries :: 1996/05 Greece, Chalkidiki :: Boat trip to Mount Athos. Peninsula governed by monks. Up . << Prev . Coast is pretty different here -- from beaches to unclimbable rocks. Next >> . Created with the tool album script from MarginalHacks by David Ljung on Wed Jun 5 20:38:30 2013 .

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• Image: View from the bridge (downtown direction)
• Album: Boat trip to Mount Athos. Peninsula governed by monks.
• Image: Imperial Palace park. At the distance you can see the mountain with a

Next: Polarization efficiency: size/shape/orientation effects Up: Optical properties of cosmic Previous: The 2175? feature . To model the interstellar polarization one needs to calculate the forward-transmitted radiation for an ensemble of non-spherical aligned dust grains. ... Let non-polarized stellar radiation passes through a dusty cloud with a homogeneous magnetic field. ... The angle between the line of sight and the magnetic field is ( ). ... where the angle is connected with and ( ). ...

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• Extinction properties (transmitted radiation)
• Nebular Abundances For PNe of Different Central Star Masses
• intro3e

... 13, Moscow 119992, Russian Federation, e-mail: busarev@sai.msu.ru; 2 Research Institute Crimean Astrophysical Observatory, p/o Nauchnyi, Crimea 334413, Ukraine, e-mail: prok@crao.crimea.ua Summary: We propose a combined method of astronomical investigations of small or distant planets incorporating registration of a set of integral spectra of an object and their frequency analysis. ... An application of the method is shown on example of asteroid 21 Lutetia. ... 6] Busarev V. V. (2002), Solar Sys. ...

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Blackholes2 Forum Message . Forums: . ... Discussion Forums | ... Cool Ideas Krill . Forum List | ... Post Message | ... But we see it with a narrower diameter, due to bending of light at great distances by mass (like Einstein's idea of large mass bends light). ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• Distant Galaxy Red Shift Caused By Time Passage Variation. - an Astronomy Net

... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. ... You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model . ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Bitesize Astronomy
• Phil Plait's Bad Astronomy: Bad TV
• Phil Plait's Bad Astronomy: Mad Science

... 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. ...

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• Measurement of the dark halo shape in polar ring galaxies