... Submitted by Al Takeda on 10/12/2010 13:23:34 . P103/Comet Hartley 2 and the Double Cluster . P103/Comet Hartley 2 and the Double Cluster in Perseus. The comet brightened to approximately 6th magnitude as it passed the open clusters NGC 869 and NGC 884. The clusters are separated by a few hundred light years (ly) and are 7,000 ly away. ... 8 October 2010. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... Archives . ... Another deduced conclusion from reading preprints listed in arxiv/astro-ph is that astronomers tend to confuse classification and clustering and to mix up methodologies. They tend to think any algorithms from classification or clustering analysis serve their purpose since both analysis algorithms, no matter what, look like a black box . ... Category: Algorithms , arXiv , Astro , Bad AstroStat , Cross-Cultural , Data Processing , Frequentist , Jargon , Methods , Stat | ...

The AstroGuide . ... AstroGuide | ... AstroGuide Listing . ... See many more Astronomy Listings by: Category or Alphabet . The ATMoB is a group of about 300 individuals in the greater Boston area. In addition to telescope making, our club members are involved in star, comet, and planetary observing. ... Web Site . ... Web . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... HST . ... APT . ... HST Overview . Overview . ... Phase I Proposing . ... Cycle 24 Announcement . ... Phase II Cycle 23 . ... Documents . ... After you have brought up APT you will see a "Help" menu on the top menu bar. From here you can also bring up the documents that will help you to learn APT. Phase I: You can bring up Phase I Specific APT Training Materials to learn about using APT to submit your Phase I proposal. ... These are the same documents you will find on the HST Website. ...

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. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Stars . ... Space Flight . ... Monthly Sky Notes . ... By admin October 1, 2010 Posted in: Stars . A sky of blazing stars (Image Credit: NASA/ESA) . Imagine that once the Sun sets, rather than a dark sky sprinkled with a few thousand dim stars, we had a sky blazing with ten thousand or so stars blazing brighter than Venus. ... Planets orbiting stars in the NGC 3603 Young Cluster would experience just such a sky. ...

... Credit Copyright: Rogelio Bernal Andreo Explanation: An alluring Comet Hartley 2 cruised through planet Earth's night sky on October 8, passing within about a Full Moon's width of the famous double star cluster in Perseus. ... On October 20, the comet will make its closest approach to Earth, passing within about 17 million kilometers. ... October . ... Publications with keywords: comet - Perseus cluster - Heart Nebula . Publications with words: comet - Perseus cluster - Heart Nebula . ...

... In 1930, Trumpler noticed that linear diameters (LD) of open clusters increase with distance (D) from the Sun. ... Since that time, the interstellar absorption has become one of the best studied factor in astrophysics, and we may hope that current OCL distance scales are free from this LD-D correlation. To verify if this is the case we have chosen several modern OCL distance scales and test them with the same clusters and the same angular diameters that Trumpler had used back in 1930. ...

... Star Atlas . ... Giant star clusters make new stars by т??adoptingт?? stray cosmic gases . ... STAR CLUSTERS . ... This method stands in contrast to the conventional idea of the clusters initial stars shedding gas as they age in order to spark future rounds of star birth. ... We have now finally shown that this idea of clusters forming new stars with accreted gas might actually work, said de Grijs, and not just for the three clusters we observed for this study, but possibly for a whole slew of them....

... 2010 October 14 . Clusters, Hartley, and the Heart . ... Explanation: An alluring Comet Hartley 2 cruised through planet Earth's night sky on October 8, passing within about a Full Moon's width of the famous double star cluster in Perseus. ... To capture the cosmic moment, a relatively short 5 minute exposure was used to freeze the moving comet in place, but a longer exposure with a narrow-band filter was included in the central and right hand frames. ... About APOD | ...

... Mr. and Mrs. Star Cluster thanking everybody . The Waltz of Uta Fritze-von Alvensleben and Jan Palous . ... Kathy enframed by Terry and Eric . ... Andrew McWilliam, Andrea Gilbert, and Bernhard Brandl . Jay Gallagher making the point . Jay Frogel having fun . Jenny Eric: applause for the party . Tango at its best: Paul Andrea . Markus, extremely excited about the party ... or about Rupali and Pauline? ...

... Do not warn when variables are not explicitly declared. ... Do not check if a variable has been initialized before being used. If a variable is not in a DATA, COMMON, PARAMETER or SAVE statement, and if it is not a dummy subroutine argument, then Flint normally attempts to check that the variable is initialized before it is used. ... By default Flint warns if subroutine or variable names are longer than 8 characters, or if they contain underline or dollar characters. ...

. Reconnecting Science and Art . Album . News . Resources . Web . Links . Who are we? . A Peace and Reconciliation project supported by the European Union through the Southern Cluster Partnership . Next . List . Ideas for you to make . б© 2010 OASES . [Back To Top] .

... 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]. ...

Title: A New Model of the Gravitational Lens 0957+561 and a Limit on the Hubble Constant . Authors: Norman A. Grogin , Ramesh Narayan (Harvard Univ.) ... Title: ROSAT/PSPC observation of the distant cluster CL0939+472 . ... Title: Interaction in the Bimodal Galaxy Cluster A3528 . ... Title: Cosmological Implications of Galaxy Cluster Evolution . ... Title: Galaxy Cluster Virial Masses and Omega . ... Matches 201 to 222 from a total of 222 matches for the search pattern galaxy cluster . ...

... We have made observations of the Perseus cluster with the Westerbork Telescope at 610 MHz. ... Several newly detected sources are identified with cluster galaxies. ... No evidence is found for the existence of the previously reported ~ 65'x25' cluster halo, 3C 84B. Key words: radio galaxies - clusters - tailed radio sources buoyancy The Perseus Cluster of galaxies is one of the most fascinating systems accessible to extragalactic astronomers. ...

... 2000, ApJ, 537, L49 . ... F. Palla . Invited Talk at the IAU Symposium 200 "The formation of binary stars" eds. R.D. Mathieu and H. Zinnecker (ASP Conf. Ser.) in press . Optical follow-up of ROSAT discovered candidate members of the open cluster Coma Berenices . ... 2000, A , in press . ... 2000, ApJ, in press . ... 2000, ApJ, in press (Sept. ... 2000, ApJ Lett., in press . ... Click to examine publications from other years . ... Star Formation Group . ... Arcetri Home Page . ...

... Structure of Data . ... Catalog . ... In SAI OCL Catalog, we introduce our work on investigation of the Milky Way system of open star clusters. The main goal of our study is a search for new clusters using huge surveys. 168 new clusters have been already discovered by us using J,H,Ks data from 2MASS point source catalog. ... For 141 new clusters, we found their physical parameters using J,H,Ks data from 2MASS catalog and, for a number of clusters, our UBVRI CCD observational magnitudes. ...

... ISC Kosmotras . ... Comments, Opinions Publications Dnepr Program . Dnepr launch record 17 August 2011. ... The success of PICARD launch re enforces our high level of appreciation of the quality of the DNEPR launcher and of the professionalism and efficiency of ISC Kosmotras. ... The distinguishing feature of the THEOS launch by a converted SS-18 ICBM (Dnepr LV) is that it was the first ISC Kosmotras mission from the Yasny launch site that headed southward to its Sun-synchronous target orbit. ...

... Bad Astronomy . ... Bitesize Astronomy . ... The next step up are true clusters, called open clusters . Open clusters (sometimes misleadingly called "galactic clusters") are groups of stars ranging in size from a few dozen stars up to tens of thousands. ... The youngest is about 1 or 2 million years old, while the oldest is about 6 or 7 billion years, making it just older than our own solar system. ... So by looking at the stars in the cluster we can tell pretty well how old they are. ...