. Next: The galactic population of Up: Distances Previous: Optical identifications . љ . Binary Pulsars . Very precise timing . Measure the proper motion . Measure the orbital period derivative . Proper motion causes a time variable Doppler effects which contributes to the observed . If dynamically clean system . Solve for distance and velocity. Jon Bell . Thu Dec 19 15:15:11 GMT 1996

... Сегодня: 10 апреля 2016 г. Компания Boeing Business Jets объявила о поставке первого самолета модели "Боинг Бизнес Джет-2". ... Предполагается, что на долю самолетов "Боинг Бизнес Джет 2" будет приходиться 25% от суммарного объема продаж компании Boeing Business Jets. ... Дальность полета "Боинг Бизнес Джет 2" - 10650 км. ... Компания Boeing Business Jets поставила первый самолет модели "Боинг Бизнес Джет-2", на долю которой предположительно будет приходиться 25% от объема продаж компании . ...

... Recent Topics . ... Forum . MAO main . Info . IAU General Assembly: Business Sessions* . ... Тема: *IAU General Assembly: Business Sessions* . ... You will find attached the schedule of the two Business Sessions of the . next General Assembly in Honolulu. ... These Sessions will be preceded on the first day of the General Assembly . ... General Secretary . ... Board Categories MAO main - Info - MAO - news - Flame Technical - Technical Support(Forum)(Техподдержка(Форум)) . ...

... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

... See "About ATMoB" / "Network" for more details on the clubhouse network. ... Direct viewing of a laser-pointer beam, even briefly and at a distance of a kilometer or two, has the potential to cause temporary flash blindness — the same effect you get right after a flash photo is taken — or afterimages. ... To help use our laser tools safely, the Amateur Telescope Makers of Boston, Inc. has adopted these recommendations as policy. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... 23a. The Centrifugal Force . ... 24a.The Rotating Earth . ... Sunlight Earth . ... One important rotating frame is the surface of the Earth, rotating with a period of about 24 hours--more accurately, 23 hrs 56.07 min or 86164 seconds. ... To derive the centrifugal acceleration on the equator (i.e. the force in Newtons on one gram mass, rotating with the Earth), we calculate in meters and seconds . ... Effective gravity on the equator is reduced by the rotation, but only by about 1/3 of a percent . ...

... The effect of the bug has been that timestamps indicating when data was taken (FITS-header keyword CRVAL5) may be off by one second. ... DETAILED DESCRIPTION -------------------- AFFECTED KEYWORD: The affected keyword is: CRVAL5 (time stamp indicating start time of subscan) Synchronisation errors between the 1PPS pulses and the NTP-controlled system clocks have frequently caused the timestamps indicating the start of each subscan (CRVAL5) to be off by one second. ... That problem has also been fixed...

... Two years ago, the Clementine space probe snatched this picture of the Moon as lit not by direct sunlight, but by reflected sunlight from Earth. ... Out With the Tide . ... Tides occur because the gravitational force between two bodies decreases with distance. ... The imbalanced gravitational pull of the Moon causes the oceans to be slightly non-spherical, creating two high tides and two low tides. ... In return, the Moon exerts a gravitational force on the high tide, causing Earth to rotate slower....

... Archives . ... They find yearly modulation in their detected scintillation rate that matches what you would expect if the Earth were rushing through Galactic Dark Matter as it goes around the Sun. ... Significant! ... Certainly, at 8-sigma, it is easy to accept that there is modulation. ... Astronomers in general are extremely suspicious of any yearly modulations, as we have learnt from hard experience that it is an extremely common source of systematic error. ... Chandra Blog . ...

... With the Moon's terminator moving almost 10 mph (16 km/h) across its equator, how long would it take for an observer using binoculars to notice a change in lunar features? ... The lunar terminator, the sunset/sunrise line that sweeps across the Moon s surface as the Moon orbits Earth, travels at a rate of 9.6 mph (15.4 km/h) along our satellite s equator. ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

Astronomy Discussion Forums . Forums: . ... Discussion Forums . ... Does Gravity Propagate Like EM Waves? Forum List | ... Post Message | ... Do you mean the effect of gravity , In that how long it takes for a gravitational effect to reach the object it's effecting? ... John . ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

Authors: V.A. Marsakov , Yu.G. Shevelev , . Journal: 1988, Astron Zh. ... Absolute magnitudes, metallicities, effective temperatures, surface gravities, distances, and tangential velocities are calculated for 5498 F stars with homogeneous data on uvby photometry and proper motion, and placed within 80 pc from the Sun. Components of space velocities, eccentricities of galactic orbits, perigalactic and apogalactic distances, and maximal remotness from galactic plane are presented for 1787 stars. ...

... Events . Educational programs (English) . ... Pre-university education . ... Grants and support . ... Samara region . SSAU History . SSAU roadmap . ... Student clubs . ... On February 19, the technological enterprise club held its first meeting at the SSAU Media Center. ... The meetings are supposed to help people believe in themselves, and then to find the answers to such questions as how to start your own business, where and how to find an investor, what support programs are there. ...

The 6th INTEGRAL Workshop . The Obscured Universe . ... Travel support . Past workshops . ... Visa support . ... All foreigners are required to obtain visas to enter Russia. If you travel alone, the cheapest option (saves you $30) is to obtain a "business visa" using an official invitation from IKI. ... The ESA representatives can obtain an official invitation for a "business visa" from the ESA Office in Moscow. ... If you travel alone, IKI can generate an invitation for "business visa". ...

Previous Editions of the M111: . ... Severe Space Weather . ... On Line"! ... Any time you have something you'd like to offer - be it a story of how you first got started in astronomy, a star party you just attended, a telescope you just bought, or your favorite constellation, just drop me a line with the story included and I'll be sure to get it posted! ... You can keep an eye on space weather yourself at the National Weather Service's Space Weather Prediction Center, www.swpc.noaa.gov . ...

... A rough estimation is that in the United States there is one planetarium per 100,000 population, ranging in size from the Hayden Planetarium's 20-meter dome seating 430 people, to three-meter inflatable portable domes where children sit on the floor. ... Together dblo associates make a huge impact in the architecture, interior design and development arena in London. ... With the holidays around the corner what better way to spoil your family than with your very own private home cinema. ...