... NGC 6791: An Old, Large Open Cluster . ... NGC 6791 is one of the oldest and largest open clusters of stars known. ... The Rosette Nebula in Hydrogen, Oxygen, and Sulfur . ... The great abundance of hydrogen gas gives NGC 2237 its red color in most photographs. ... Galaxy Dwingeloo 1 Emerges . ... NGC 4214: Star Forming Galaxy . ... Galaxies Cluster Toward the Great Attractor . ... The galaxies pictured above are part of a cluster of galaxies called ACO 3627 near the center of the Great Attractor. ...

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... 2006 December 8 . NGC 2174: Emission Nebula in Orion . ... Explanation: A lesser known sight in the nebula-rich constellation Orion, NGC 2174 can be found with binoculars near the head of the celestial hunter . ... Covering an area larger than the full Moon on the sky, this stunning narrow band image adopts a typical color mapping of the atomic emission from NGC 2174. ... Placing your cursor on the image will reveal an alternative image of the nebula made through broad band filters . ...

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• APOD: 2009 December 21 - Star Cluster R136 Bursts Out
• APOD: 2003 December 2 - NGC 869 and NGC 884: A Double Open Cluster
• APOD Index - Stars: Globular Clusters

... STScI-PRC00-25 A DYING STAR IN GLOBULAR CLUSTER M15 The globular cluster Messier 15 is shown in this color image obtained with the NASA Hubble Space Telescope's Wide Field Planetary Camera 2 (WFPC2). ... Known as Kuestner 648, this was the first planetary nebula to be identified in a globular cluster. ... At the present time, the most massive stars remaining in M15 have about 80 percent of the mass of our Sun, a fact that makes the existence of a planetary nebula like K 648 something of a mystery. ...

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• APOD: December 13, 1997 - The Coma Cluster of Galaxies
• A Search for Clustering around Herbig Ae/Be Stars
• APOD: 2000 January 11 - The Rosette Nebula in Hydrogen, Oxygen, and Sulfur

... Abstract . ... Orbits, Masses, and Densities of Three Transneptunian Binaries . ... ACS Imaging of a Unique Spitzer Field: Morphology of mid-IR Variable Sources . ... Eclipsing Binaries in the Local Group: Calibration of the Zero-point of the Cosmic Distance Scale and Fundamental Properties of Stars in M31 . ... Pieter van Dokkum, Yale University . ... An ACS Treasury Survey of the Coma cluster of galaxies . ... HST / Chandra Monitoring of a Dramatic Flare in the M87 Jet . ... Past weeks: . ...

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• December 2011
• HST this week: 315
• HST this week: 124

Photon Scattering: Basic Principle of Photon Scattering . Audio Narration is available . No Scattering: Photon Source and Detector . ... For optical photons, scattering goes as wavelength to the -4 power. In the case of blue photons compared to red photons, this means that blue photons are about 10 times more likely to get scattered than red photons. ... Watch the blue photons scatter away from the detector . ... Interstellar dust make stars appear redder than they really are . ...

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• Astronomy HyperText Book: Stellar Clusters

... As an experiment, I made some three-color images of Messier 42, more commonly known as the Great Nebula of Orion. ... green enhanced . ... halfsize or fullsize . ... Each image is a ``true color'' composite of three monochromatic images, in which the red, green, and blue intensities each correspond to the intensity of one of the original images. ... The HST image is assembled from different filters than mine: red is Nitrogen [II] at 6583 , green is H-alpha at 6563 , and blue is O [III] at 5007 . ...

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• Pulsar Highlights - A Dozen new MSPs in Globular Clusters
• The Pleiades
• The Tarantula Nebula

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Survey Telescopes . ... Star Clusters . ... FLAMES . ... 100 Hours of Astronomy . ... IMAX€о 3D Film Hidden Universe . ... This image, the first to be released publicly from VISTA, the worldтАЩs largest survey telescope, shows the spectacular star-forming region known as the Flame Nebula, or NGC 2024, in the constellation of Orion (the Hunter) and its surroundings. ...

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• Artist's impression of an exoplanet orbiting a star in the cluster Messier 67 |

... Posts tagged ?globular cluster? ... Posted by hlee . Someone emailed me for globular cluster data sets I used in a proceeding paper, which was about how to determine the multi-modality (multiple populations) based on well known and new information criteria without binning the luminosity functions. ... On the other hand, obtaining globular cluster data sets was easy because of available data archives such as VizieR . ... Category: arXiv , Astro , CHASC , Data Processing , Imaging , Jargon , Stars | ...

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• The AstroStat Slog Blog Archive my first AAS. IV. clustering
• The Chandra Multiwavelength Project (ChaMP)
• The AstroStat Slog Blog Archive [ArXiv] Bimodal Color Distribution in GCS,

J/AstL/vol/page SAI Open Clusters Catalog (Glushkova+, 2009) ================================================================================ Automated search for star clusters in large multiband surveys. ... Color excesses E(B-V), distance moduli and ages were determined for 141 new and 27 known, but poorly studied clusters. We present the Sternberg Astronomical Institute Open Clusters Catalog (SAI OCL Catalog) of coordinates, diameters and main physical parameters of these clusters. ...

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• SAI Open Star Clusters (SAI OCL) Catalog
• SAI OCL Catalog NGC 7788
• SAI OCL Catalog King 13

... Bad Astronomy . ... Bitesize Astronomy . ... Have you ever looked at pictures of Saturn's rings and noticed what look like gaps in the rings? ... Gian Domenico Cassini discovered a large gap in Saturn's rings in 1675. Later, an astronomer named Encke discovered a smaller gap near the edge of the rings. ... It was found long ago that an orbit in the Cassini Division, as the large gap is named, has a period almost exactly one-half that of one of Saturn's moons named Mimas. ... 2008 Phil Plait. ...

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... Tonight's Sky . ... The Magazine . News . Observing . ... Magazine . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... Astronomy for Kids . ... December 2015 . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...

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• Hubble views an old and mysterious cluster | Astronomy.com
• New VISTA image of star cluster 47 Tucanae | Astronomy.com
• Hubble uncovers largest known population of star clusters | Astronomy.com

... BLUE STRAGGLER STARS are unusually hot and bright stars found in the cores of ancient star clusters known as globulars. ... BACKGROUND (from wikipedia): Blue straggler stars are stars in open or globular clusters that are hotter and bluer than other cluster stars having the same luminosity. ... There is evidence in favor of this view, notably that blue straggler stars appear to be much more common in dense regions of clusters, especially in the cores of globular clusters. ...

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• GSAOI Orion Nebula Cluster Science Page
• GSAOI Super Star Clusters Science Page

. F IGURE . 3. Relations between the metallicity and other GC parameters. The open triangles are thick-disk clusters; open circles, old halo clusters; filled circles, young-halo clusters; filled triangles, corona clusters; and crosses, metal-poor clusters with unknown (B–R)/(B+V+R) . Only clusters with R<60 kpc are shown in (c). A sharp jump near [Fe/H]=-1.0 is seen in all plots. discussion in the text | previous figure | next figure .

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• Population of Galactic globular clusters, tabl
• Vladimir Marsakov Abstracts
• Globular clusters with anomalously small masses, figures

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... Posted on September 11, 2015 | ... Continue Reading.. ... No Comments Peer deep into the constellation Sagittarius and you will find a spectacular young star cluster and its associated stellar nursery. ... Posted on September 14, 2012 | ... No Comments Our Image of the Month was released to celebrate the 22nd anniversary of the NASA/ESA Hubble Space Telescope and is a striking panoramic look at a stellar nursery which is [ ] . ...

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• M55 globular cluster seen by ESO | Astronotes
• Omega Centauri: globular cluster of 300,000 stars | Astronotes
• stellar nursery | Astronotes - Part 2

This animation shows a galaxy cluster with two mass concentrations (the pink shading indicates the projected mass density) lensing a background field of faint blue galaxies. ... Inside the Einstein ring radius one has radial arcs, and right in the center of the cluster there are demagnified images. The highest magnifications occur at the Einstein ring radius, giving the large tangential arcs. ... Abell 2218 and CL2244-02 are clusters with tangential arcs. ... Tutorial : Part 1 | Part 2 | ...

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• A 20 cm VLA survey of Abell clusters of galaxies
• A VLA Survey of Rich Clusters of Galaxies I.
• A VLA Survey of Rich Clusters of Galaxies III

... LMC Project Outline . NGC 1818 Initial Results . ... The Large Magellanic Cloud (LMC) is uniquely suitable for the study of massive star clusters at all stages of evolution. By combining HST observations of these clusters with N-body models we hope to understand the origin and evolution of rich star clusters in our own Galaxy, in the LMC, and beyond. ... We aim to combine our HST observations with N-body models to understand the formation and evolution of globular clusters. ...

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... We still have a long distance to cover before we leave the Milky Way Galaxy -- tens of thousands of lightyears, as a matter of fact -- so let's stop by some interesting objects on the way. ... But we have reached the edge of the Milky Way Galaxy. ... We don't know, but we do know that there are countless voyages left to take. To continue the virtual voyage beyond our galaxy, go to Kent Cheatham's "A Walk in the Stars" at http://www.ionet.net/~cheatham/astro/astrotour.shtml . ...

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• ASP: Big Clusters, Tiny Galaxies
• ASP: Globular Clusters and Satellite Galaxies: Companions to the Milky Way
• ASP: More About Deep Space Objects and Cosmic Terms

... In typical nightly use, the wide field and planetary telescope and cameras record images of favorably placed objects in the sky, including constellations, bright variable stars, nebulae through narrow-band filters, comets, the Moon, and planets. ... Shared Skies telescopes are available for use by students at the University of Louisville and the University of Southern Queensland, and by teachers and students in middle and high schools mentored by faculty at the universities. ...

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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 . ...

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... Compact Binaries . ... Globular Clusters . ... Ultra-Compact binaries in globular clusters . ... It is known that UC X-ray binaries are more abundant in globular clusters compared to that found in Galactic fields (eg van der Sluys, Verbunt \ Pols 2005 and references therein). On the other hand no AM CVn systems have been found in globular clusters, while 20 are known in the Galactic field (for a review of AM CVn systems see Nelemans 2005). ...

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• FETTU - Page 1
• Armagh Observatory
• IAJ: News Views