... Mystery flare , from Terry Moseley: . While observing a pass of the ISS tonight (now last night, July 10!) ... It was in the general region of Gamma Ophiuchi, although the sky was too bright, with too few stars visible, for me to get an accurate position. AHA, you'll say - an Iridium Flare! ... BUT - they usually appear in roughly the same quadrant of the sky as the predicted flares, since the Sun-Earth-Satellite angle is similar. ... International Year of Astronomy, Ireland National Node . ...

Еще в разделе: (Показать все результаты (>3655) - star.arm.ac.uk/ )

... Cluster and Starforming Region Westerlund 2 . ... Credit Copyright: NASA , ESA , the Hubble Heritage Team . ... The cluster's dense concentration of luminous, massive stars is about 10 light-years across . Strong winds and radiation from those massive young stars have sculpted and shaped the region's gas and dust, into starforming pillars that point back to the central cluster. ... April . ... April 2015 . ... NGC 3293: A Bright Young Star Cluster . ... Globular Star Cluster NGC 6752 . ...

Еще в разделе: (Показать все результаты (>126218) - www.astronet.ru/ )

• XWare > APOD

... WFPC2 Home . ... Bright stars near the WFPC2 field of view can cause various artifacts to appear in science images. ... When writing Phase II proposals, observers will sometimes attempt to avoid bright stars by placing them in the un-imaged "L" shaped region adjacent to CCD PC1, or in the region just outside the nominal field of view. ... In both cases the optics can image this light back onto the CCD's. Bright stars must be placed at least 10 arcseconds outside the field to avoid artifacts. ...

Еще в разделе: (Показать все результаты (>15261) - www.stsci.edu/ )

• ST ScI Preprint #1362
• Making HST Pictures: Illustrations
• Observing Faint Targets Near Bright Objects

... 2015 April 25 . Cluster and Starforming Region Westerlund 2 . Image Credit Copyright : NASA , ESA , the Hubble Heritage Team . ... Explanation: Located 20,000 light-years away in the constellation Carina, the young cluster and starforming region Westerlund 2 fills this cosmic scene . ... Strong winds and radiation from those massive young stars have sculpted and shaped the region's gas and dust, into starforming pillars that point back to the central cluster. ... About APOD | ...

Еще в разделе: (Показать все результаты (>6893) - www.sai.msu.su/ )

• APOD: 2002 July 18 - Sunspot Region 30
• APOD Index - Nebulae: Emission Nebulae
• APOD: 2002 July 17 - Star-Forming Region RCW38 from 2MASS

... The TRACE images may be used without restrictions in publications of any kind. ... These two images, taken on 18 November 2000 at 15:54UT and 16:11UT, respectively, show such an event: the red circle in the image to the left shows a region where many loops are cooling, with bright loop tops (the intensity scales with the square root of the image to reduce the dynamic range). ... See also a collection of images related to the Sun, other cool stars, and solar-terrestrial effects . ... Images | ...

Еще в разделе: (Показать все результаты (>9010) - www.arcetri.astro.it/ )

• APOD: October 18, 1999 - NGC 3603: An Active Star Cluster
• The BD+40 region (Abstract)
• TRACE_IMAGES

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

Еще в разделе: (Показать все результаты (>311) - www.badastronomy.com/ )

... Neutral and Ionised Hydrogen in NGC 4214 V. J. McIntyre1,2 1 2 Physics Department, University of Wollongong, Wollongong, NSW 2522, Australia Astrophysics Department, University of Sydney, NSW 2006, Australia vjm@physics.usyd.edu.au Abstract: It is not clear at present how the diffuse ionised gas (DIG) component in galaxies is ionised. ... How porous the ISM must be depends on the (unknown) location of the ionised emission relative to the disk. ... 1996). ... Local H I surface density is 2в1021 cm-3 ...

Еще в разделе: (Показать все результаты (>9899) - www.atnf.csiro.au/ )

• The giant HII region NGC 3603
• ATNF Daily Astronomy Picture

... This program was created for correlating chosen regions in the series of fts images. ... Chosen regions' . ... In this section the program counts the integral for each region of the grid for each image. ... As a matter of fact, the integral is total brightness of the region and it is counted by 'int_tabulated' IDL function. ... In addition, the program will show the count of the regions which correlate with the corresponding region (the brighter region means the bigger count) and its contour. ...

Еще в разделе: (Показать все результаты (>416) - lnfm1.sai.msu.ru/ )

The red colors in this image show the galaxy M66 as it appears at the submillimeter wavelength of 850 microns, while the white background shows the galaxy as it appears in visible light. Regions of cold dust that appear as dark streaks in the white image glow brightly in the red image. ...

Еще в разделе: (Показать все результаты (>7101) - www.astronomy.com/ )

• Bright planets meet at dusk | Astronomy.com
• VISTA finds 96 star clusters hidden behind dust | Astronomy.com

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to Guesthouse . ... Survey Telescopes . ... This video fades back and forth between views of the stellar nursery Monoceros R2 in visible and infrared light. The visible-light view was created from digitised photographs through red and blue filters forming part of the Digitized Sky Survey 2 (DSS) and the new infrared view comes from the VISTA telescope at Paranal. ...

Еще в разделе: (Показать все результаты (>66070) - www.eso.org/ )

• Infrared/visible crossfade of the Monoceros R2 star-forming region | ESO...
• VISTA Reveals the Secret of the Unicorn | ESO
• VISTA Finds 96 Star Clusters Hidden Behind Dust | ESO Ireland

... 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. ...

Еще в разделе: (Показать все результаты (>673) - www.mso.anu.edu.au/ )

• GSAOI Orion Nebula Cluster Science Page
• VV29 = Arp 188 = The Chainsaw Galaxy
• C/2006 P1 (McNaught)

... The large field size of UIT is ideal for studies of globular clusters. ... Very metal poor clusters are conducive for the formation of very hot horizontal branch stars which radiate most of that energy in the UV part of the spectrum. ... M31 is the nearest large spiral galaxy to us. ... These are small dwarf galaxies and NGC 205 is a bit unusual because it still has retained some gas for star formation despite its low mass. M33 is an actively star forming spiral galaxy in the local group. ...

Еще в разделе: (Показать все результаты (>316) - zebu.uoregon.edu/ )

• Galaxy Gallery Page III
• Astronomy HyperText Book: Stellar Clusters
• The Galaxy Gallery Page 6: Comparative Morphology

... 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. ...

Еще в разделе: (Показать все результаты (>206) - www.stecf.org/ )

• Some Experiments with the Restoration of NICMOS Camera 2 Images of OMC-1
• NICMOS/HST H-band (F160W) Images of the 30 Dor Starburst Cluster

True Color Image Gallery: Galactic SNR | Magellanic Cloud SNR . ... Chandra Proposer's Guide pile up section ] During frame readout, the ACIS CCDs take 40 microsec to (parallel) transfer the charge by one pixel. As a result of this, each frame readout, each pixel is exposed for 40 microsec to a source (plus cosmic X-ray background) at each location along its column. ... Note also that the image does not just trail, it extends along the whole column. ... Chandra Supernova Remnant Catalog . ...

Еще в разделе: (Показать все результаты (>2681) - hea-www.harvard.edu/ )

• A Region mask for a radial profile in concentric, elliptical annuli
• The SAOimage Menu (options within SAOimage)
• Select a circle around the central point source

ATMoB "Open Cluster Observing Award " Guidelines Purpose: To promote observing among the membership of the Amateur Telescope Makers of Boston through participation in the Open Clusters Observing Awards program. Introduction: This awards program is oriented towards visually observing open clusters above magnitude 9.9. ... It turns out that a very unprejudiced and convenient method to dermine the limiting magnitude is to count the number of visible stars in certain areas on the sky. ...

Еще в разделе: (Показать все результаты (>66572) - www.atmob.org/ )

• Amateur Telescope Makers of Boston
• Mars pictures from Stellafane by Paul Valleli
• Amateur Telescope Makers of Boston ATMoB Observing Awards Program

... The Pleiades star cluster, also known as the Seven Sisters and Messier 45, is a conspicuous object in the night sky with a prominent place in ancient mythology . ... The stars in the Pleiades are thought to have formed together around 100 million years ago, making them 1/50th the age of our sun, and they lie some 130 parsecs (425 light years ) away. ... Data for these stars are listed in a table below. ... Yes . ... WEBDA Pleiades cluster data . ... M45: The Pleiades Star Cluster (2007 November 18) ...

Еще в разделе: (Показать все результаты (>2833) - www.naic.edu/ )

• Thesis Figures
• I-GALFA View of a Galactic Tangent Region
• ALFALFA Dark Cloud

The Sun's corona . ... For instance, short "plumes" rising from the polar regions of the Sun look very much like field lines coming out of the end of a bar magnet, and they therefore suggest that the Sun, in addition to the intense fields of sunspots, also has a global magnetic field like the Earth's. Arches above the . Sun's surface . ... It is brightest near sunspots, whose arched field lines apparently hamper the outflow of solar wind which carries away energy and helps cool the corona. ...

Еще в разделе: (Показать все результаты (>721) - www.iki.rssi.ru/ )

• Uranus' Moon Umbriel
• Comet Introduction
• Sunspots [Oulu]

... 1) A new bright galaxy of the Local Group VV124 (UGC4879) is found. ... Kopylov A.I., Tikhonov N.A., Fabrika S.N., Drozdovsky I.O., Valeev A.F., MNRAS Lett, V. 387, Issue 1, L45, 2008. ... For systems of galaxies in the regions of the Hercules and Leo superclusters the dwarf-to-giant ratio of galaxies in the r-band is evaluated, and it is found that this ratio increases with increasing X-ray luminosity at log L X > 43.5 erg/s. Kopylova F.G., Kopylov A.I., Ast. ... Kopylova F.G., Kopylov A.I., Ast. ...

Еще в разделе: (Показать все результаты (>297) - mavr.sao.ru/ )

• articles_flera_en
• A unique isolated dwarf spheroidal galaxy KKR25
• Evidences of supercritical accretion onto black hole in SS433

... 227Wink This paper containes an investigation of 91 sources which appear to be point sources when observed with the angular resolution of the 100-m telescope at 4.9 GHz, teta_a = 2.6', and which we expected to be HII regions. The basic search list was prepared from the 4.9 GHz survey of the galactic plane by Altenhoff et al. ... In the present paper we list 4.9 GHz flux densities only for sources for sources for which we present new observations. ... source structure indicated . ...

Еще в разделе: (Показать все результаты (>1759) - www.sao.ru/ )

• Space-Time with Bound Cluster
• Density Determination
• Catalog of Galaxies behind the Milky Way

... We report on our ongoing project ``Infrared Study of HII Regions Associated with Small Clouds.' ... These IR data, combined with optical imaging (which will be obtained from the IAC-80 telescope), IRAS survey maps, and existing CO observations of the associated clouds, will allow us to undertake a detailed investigation of the gas-to-dust mass ratio, initial mass function and the star-formation efficiency in these complexes. ... CHECKPSF: check the PSF (Point Spread Function) model, . ...

Еще в разделе: (Показать все результаты (>1431) - www.adass.org/ )

• Classification of Objects in the Guide Star Catalog
• Clustering Analysis Algorithms and Their Applications to Digital POSS-II
• Mapping the Jagiellonian Field of Galaxies