Definitions of Magnitudes and Surface Brightness 1 The magnitude system 1.1 Apparent magnitude Astronomers are stuck with the antiquated old system of magnitudes and so a clear explanation of what this system is and how it relates to more sensible units is important. ... 1.2 Absolute magnitude Absolute magnitude is a logarithmic luminosity scale. ... One usually goes by the round about process of referring to the absolute magnitude of the sun. ... Magnitudes and surface brightness 6/6 ...

... Home Articles Mars Attacks: First Anniversary of the Great Approach . ... Beyond New York City . ... Mars Attacks: First Anniversary of the Great Approach . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... Our own two Amateur Astronomers Association events were a resounding success. ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... The ST-ECF consisted, until its closure in December 2010, of a small group of astronomers, software scientists and media specialists who support Hubble science in Europe and collaborate internationally on HST science, instrument, archive and outreach activities. provided detailed technical information about the HST and its science instruments, . supported European astronomers in the preparation of HST observing proposals . ... acted as a European centre for associated meetings and workshops, . ...

... Programme . ... Presenter: Ronald Ekers (CSIRO/ATNF) . Abstract: Centaurus A is a very special for radio astronomers: it heralded the discovery of the extragalactic radio source population. It is the brightest radio source in the southern sky, the closest radio galaxy, the closest AGN and probably the closest super massive blackhole. For a long time it was also the largest radio galaxy known. ... CSIRO 2009 Legal Notice / Privacy Statement Last modified: 15/11/2010 ...

THE RELATIVE MONTHLY MEAN SUNSPOT NUMBER ON JUNE 2011 HAS MADE Wjune =37.0, THAT GIVES FOR 24 MONTH (2010, DECEMBER) DEVELOPMENT CURRENT 24 CYCLES OF SOLAR ACTIVITY THE SMOOTHED MONTHLY MEAN SUNSPOT NUMBER W*dec. ... THE INTERNATIONAL DAILY VALUE OF RELATIVE SUNSPOT NUMBER FOR 2011, JUNE ACCORDING DATA OF 70 SOLAR OBSERVATORIES HAS MADE 1.. ... NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY IS EXPECTED TO BE LOW AND BY THE END OF THE PERIOD APPROUCH THE AVERAGE VALUE. ...

MAIN PAGE . ... Nova Cygni August 1975! ... 1975/76: Comet West! ... Dr. Richard West (4th from left) & AAL members visiting SES Betzdorf on occasion of our club's 25th anniversary - October 1996 . Comet West Information . ... It was the brightest comet visible from Earth since Comet West in 1976. ... 1997: Comet Hale-Bopp! ... Thus Comet Hale-Bopp never got closer to Earth than Earth gets to the Sun. ... Comet Hale-Bopp JPL Page . ... 1999: Total solar eclipse over Luxembourg! ...

... Meta Index / Home Page / Source Flagging Algorithms Any source either having a raw count-rate >= 80, or with quality flag bit 4 set (mod-8 pattern) is checked for "close" neighbours, which may be flagged. ... Check each source in the vicinity of the bright source . ... Compute the maximum distance for flagging the source from maxRad = max(exclusionradius, min(70.0, 35.0 * countTable(i) // 80.0) ) If the flagging is done by omdetect, the exclusion radius is determined from the algorithm at the end . ...

. Album : asv-album :: Travels to distant places and countries :: 1999/09 Florence, Rome (Italy) :: 14/09 Across the Arno . Up . << Prev . Close-up of the city wall. On via di Belvedere. Next >> . Album created by album tool from MarginalHacks by David on Tue Jun 23 14:47:02 2015 .

... 8, ``Celestial Mechanics'', 2002 CCD observations of planetary satellites and occultations and close approachments of stars by asteroids with 26­ inch refractor of Pulkovo observatory T. P. Kiseleva, I. S. Izmailov, M. A. Mozhaev Pulkovo Observatory, St. Petersburg, Russia ST--6 CCD camera has been used with 26-- inch Refractor at Pulkovo for ob­ servations of ... These estimates are \Sigma0:015 arcsec and \Sigma0:014 arcsec for X and Y correspondingly. ...

Тема : Хвостатые гостьи V (информация для наблюдения комет) .. Показать сообщение отдельно . ... Хвостатые гостьи .. ... после того, как ISON приплыл мимо нас, земля находится на орбитальной траектории, которая пройдет через след частицы кометы (тот, который ISON оставил позади, когда это приближалось к солнцу и это случайно встретит или вокруг 12 января - 15, 2014 . ... лучшее время наблюдения 22:00 LDT (Northern hemisphere 45њ North) .. - радиант расположен вблизи Al'dzhabkhakh (30-Eta Leonis, ? ...

... Corvus Capital, along with its own capital, has the backing of a number of international funding partners. ... MyCloudtag App has launched in the Apple App Store Google Play store! App Fitness & Health . Andrew Regan lead a 10 man team on the first ever there-and-back crossing of the Antarctica. ... CloudTag is a London Listed Company focused on the Fitness and Wellbeing Market. AIM Fitness & Health . Sirius Petroleum is an Oil Gas Company listed on London's AIM. AIM Oil & Gas . ...