... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2015 March 9 . Galaxy and Cluster Create Four Images of Distant Supernova . ... In this case the masses are a large galaxy and its home galaxy cluster . ... Measuring the locations and time-delays between the supernova images should allow astrophysicists to recover the amount of dark matter in the galaxy and cluster. ... About APOD | ...

... May 3, 1997 . Giant Cluster Bends, Breaks Galaxy Images . ... Explanation : What are those strange blue objects? Many are images of a single, unusual, beaded, blue, ring-like galaxy which just happens to line-up behind a giant cluster of galaxies. ... The distinctive shape of this background galaxy -- which is probably just forming -- has allowed astronomers to deduce that it has separate images at 4, 8, 9 and 10 o'clock, from the center of the cluster. ... About APOD > . ...

Supernova 2001X in NGC 5921 . This page is devoted to information on Supernova 2001X in NGC 5921 Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page . Information on the original web pages for many of these images can be found on the updates and links web pages. ... SNWeb has a 2001X page . ... 2001/03/02.386 . ... 15.2 . ... Arne Danielsen image . ... JM Llapasset image . ... vsnet-alert 5763 ] SN 2001X in NGC 5921 . ...

ABSOLUTE PROPER MOTIONS OF 331 OPEN CLUSTERS . ... The proper motions of stars in the fields of 331 open clusters were taken from Four-Million Star Catalog (4M-catalog) of positions and proper motions (Volchkov et al. ... The absolute proper motions for 21 young open clusters have been derived by comparison of precise relative proper motions of individual stars and their corresponding absolute proper motions. ... Sign of proper motions in RA . ... 0.0001 arcsec/yr . ... rms error in RA proper motion . ...

... After the 2nd World War, the Executive Committee of the International Astronomical Union (IAU) made two groups in Moscow responsible for catalogues of variable stars. ... Presently, the variable-star catalogue groups still exist within the Sternberg Astronomical Institute and the Institute of Astronomy of Russian Academy of Sciences . ... Elena Kazarovets (variable stars in open clusters, Peremennye Zvezdy journal, GCVS) . ... Nataliya N. Kireeva (variable stars, globular clusters, GCVS) . ...

... Новости Астрономии и Космонавтики: от ПРАО , от "Звездочета" , от Железнякова , от "Переплета" ; . ... Рейтинг страниц в теме: . ... В списке темы всего страниц: 29 , из них 7 новых (менее 100 дней) и 1 малооцененных (менее 5 оценок) . ... Оценено и сдано в архив! . ... Rambler-Наука (в т.ч. Астрономия) . ... Курс общей астрономии' (4-е издание, для высших учебных заведений) new! ... Основы астрономии (учебный курс на базе основ физики и математики) new! ... Проект 'Физика и астрономия' new! ...

... The distance scales of the objects are matched both by comparing the first derivatives of the angular velocity determined separately from radial velocities and proper motions and by the statistical-parallax method. ... Good agreement between the inferred 0 and our calculations based on space velocities suggests that the Lindblad relation holds throughout the entire sample volume. ... Brandt and Blitz (1993) published the distances and radial velocities for a total of 206 H II-regions. ... Astron. ...