... Classifying or clustering (or semi supervised learning) spectra is a very challenging problem from collecting statistical-analysis-ready data to reducing the dimensionality without sacrificing complex information in each spectrum. ... Continue reading ?[ ... Category: Algorithms , arXiv , Cross-Cultural , Data Processing , Jargon , Methods , Spectral , Stat | ... Category: Algorithms , arXiv , Astro , Bad AstroStat , Cross-Cultural , Data Processing , Frequentist , Jargon , Methods , Stat | ... ADS ...

... 295 Astronomical Data Analysis Software and Systems XII, eds. H. E. Payne, R. I. Jedrzejewski, & R. N. Hook (San Francisco: ASP), 431 . ... We discuss the development of a Java toolbox for astronomical time series data. ... The TSA module analyzes the time series data and performs trend prediction and rule discovery on both real time and historical data. ... Hetland, M. L. 2002, in Data Mining in Time Series Databases, ed. M. Last, A. Kandel and H. Bunke (World Scientific), in press. ...

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Stellar Clusters are very useful laboratories for empirically studying stellar evolution. ... All cluster stars are at the same distance . All cluster stars have the same physical age . ... CM diagram Young Cluster In this case we see the Main Sequence fully represented. The blue dots represent massive stars with short main sequence lifetimes. ... Thus, identifying the most massive star which is still on the main sequence is an effective means of determining the age of a stellar cluster. ...

... Our recent observations with the Hubble Space Telescope (August 29, 2014) led to revealing a highly isolated dwarf spheroidal galaxy KKs 3 situated at a distance of 2.12 0.07 Mpc from the Milky Way. The dSph galaxy locates on the southern sky (RA=02 h 24 m 44.4 s , Dec.= ... Over the last decade, about 30 dSph galaxies have been discovered inside the Local Group through systematic search in the vicinity of M31 and more that a dozen dSphs were discovered in the nearby group around M81. ...

... Comet Hartley Passes a Double Star Cluster . ... Open clusters NGC 869 and NGC 884, however, are doubly impressive. Also known as "h and chi Persei", this unusual double cluster , shown above, is bright enough to be seen from a dark location without even binoculars . ... Captured earlier this month, the bright comet 103P/Hartley , informally called Comet Hartley 2, passed well in front but only a few degrees away from the famous double cluster. ... Hartley 2 Star Cluster Tour . ...

One of the goals of ALFALFA (the Arecibo Legacy Fast ALFA Survey) is that of verifying whether a significant population of optically faint, baryon rich, low mass systems exists. ... ALFALFA has easily detected the cloud VIRGOHI 21, reported by Davies et al. ... The clouds in the complex appear not to be gravitationally bound to one other, and may represent the remnant of an ancient episode of harassment. ... Davies, J., Minchin, R., Sabatini, S., van Driel, W., Baes, M. et al. ...

... Catalog . Publications . ... Koposov, S., Glushkova, E., Zolotukhin, I. 2008: Automated search for Galactic star clusters in large multiband surveys. ... BibTeX entry ] . ... Glushkova, E.V., Zabolotskikh, M.V., Koposov, S.E., Spiridonova, O.I, Vlasyuk, V.V., Rastorguev, A. S. 2010: Photometry of the poorly studied galactic open star clusters King 13, King 18, King 19, King 20, NGC 136, and NGC 7245 , Astronomy Letters, 36, 75 . ...

... Space Research Institute (IKI), Moscow, Russia . ... Title: Storage, Mining and Visualization of Environmental Data Archives . ... New technologies of data streaming and data storage in a parallel cluster of MS SQL databases, when combined with the parallel data mining and visualization algorithms inside the same MS Windows HPC cluster, will provide a powerful tool for interactive knowledge discovery for environmental research in the fields of global change, remote sensing and geophysics. ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... ESO . ... Survey Telescopes . ... Images . ... Galaxy Clusters . ... Star Clusters . ... Reproduction of the XMM-Newton observations of the nearby active galaxy NGC7314 (bright object in the centre) from which the newly found distant cluster (white box) was serendipitously identified. ... The inset shows the diffuse X-ray emission from the distant cluster XMMU J2235.3-2557. ...

... There is also an edge-on view of the asteroid belt here . This video was created by Scott Manley. ... View of the solar system showing the locations of all the asteroids starting in 1980. ... Notice how the pattern of discovery follows the Earth around its orbit. ... At the beginning of 2010 a new discovery pattern becomes evident, with discovery zones in a line perpendicular to the Sun-Earth vector. ... An edge-on view of the asteroids . ... Other asteroid and comet animations by Scott Manley . ...

PROGRAM LEADER: HELMUT JERJEN (ANU) . ... Kim, Dongwon; Jerjen, Helmut; Milone, Antonino P.; Mackey, Dougal; Da Costa, Gary S., 2015, "Discovery of a Faint Outer Halo Milky Way Star Cluster in the Southern Sky", ApJ, in press . ... Metz, M., Kroupa, P., Jerjen, H., 2009, "Discs of satellites: the new dwarf spheroidals", MNRAS, 394, 2223 . ... Metz, M., Kroupa, P., Jerjen, H., 2007, "The spatial distribution of the Milky Way and Andromeda satellite galaxies", MNRAS, 374, 1125 , or astro-ph0610933 . ...

... The most powerful and widely used methods to calculate the scattering matrix of a fractal cluster are based on the coupled dipoles methods (e.g. the Discrete Dipole Approximation, DDA) and the theory of light scattering by a cluster of spherical particles [2-4]. ... At present the procedure of calculation of the scattering matrix is well developed for both an oriented cluster of spherical particles and for chaotically oriented clusters of such particles [4]. ...

18th of March 2016 . Discovery of Two New Pulsars in 47 Tucanae . by George Hobbs (CASS) . Today's image shows the discovery plots for two new millisecond pulsars in the globular cluster 47 Tucanane: PSRs J0024-7204aa (the fastest known pulsar in the cluster) and J0024-7204ab. ... The new pulsars are described in Pan et al. (2016) , which includes CASS' George Hobbs and is now accepted for publication by MNRAS. ... today * ATNF | ...

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... Star Atlas . ... Behemoth black hole found in an unlikely place . ... stars . ... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... Surprising black-hole discovery changes picture of globular star clusters . ... Artist's conception of black hole in globular cluster. ... In a globular cluster, many of these stellar-mass black holes probably were produced early in the clusterт??s 12-billion-year history as massive stars rapidly passed through their life cycles. ...

... The routines implemented are CLUSTER which has 8 options for hierarchical clustering and PARTITION which carries out non--hierarchical clustering. ... The former is non--hierarchical clustering or partitioning. The latter is hierarchical clustering. Brief consideration will show that a sequence of n-1 agglomerations are needed to successively merge the two closest objects and/or clusters at each stage, so that we have a set of n (singleton) clusters, n-1 clusters, ..., 2 clusters, 1 cluster. ...

. F IGURE . 14. Age dependences of (a) metallicity, (b) Galactocentric distance, and (c) distance from the Galactic plane for the globular clusters of Galactic origin. Notation is the same as in Fig. 3 . The dashed lines are rms regression fits for both subsystems taken together, and the solid lines are the individual regression fits for each subsystem. The squares indicate clusters excluded from the regression solutions according to a 3 criterion. discussion in the text | privious figure .

An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . THE CHANGING UNIVERSE: EVOLUTION HAPPENS! . b) Changes in Stars . One of the great discoveries of modern science is that stars (like people) live only a measurable life-time and then die. Although the lives of the stars are enormously longer than the span of a human life, we can learn about the life story of the stars by studying them at many different stages in their life cycle, from birth to death. ...