... NGC 5882: A Small Planetary Nebula . ... Will most stars one day look like this? ... Although planetary nebulae can appear similar to planets like Uranus and Neptune, they are actually gas clouds surrounding stars typically hundreds of light years away. ... A Close-Up of the Lagoon's Hourglass . ... A Close-Up of the Lagoon Nebula . ... Ribbons of red-glowing gas and dark dust surround massive young stars in this close-up of the Lagoon Nebula taken by the Hubble Space Telescope. ...

Еще в разделе: (Показать все результаты (>133161) - www.astronet.ru/ )

... 2001 February 7 . Distant Open Cluster M103 . ... Explanation: Bright blue stars highlight the open cluster known as M103 . The gas clouds from which these stars condensed has long dispersed. ... In fact, a formerly blue star has recently evolved off the main sequence and is visible above as the red giant star near the cluster center. In general, yellow stars like our Sun are usually less bright and hence less prominent in open clusters than their massive blue cousins. ... About APOD | ...

Еще в разделе: (Показать все результаты (>6268) - www.sai.msu.su/ )

• APOD: 2000 February 27 - The Pleiades Star Cluster
• APOD: 2008 February 10 - Abell 2218: A Galaxy Cluster Lens
• APOD: 2004 February 22 - The M7 Open Star Cluster in Scorpius

Astronotes Armagh Planetarium's Stellar Blog! ... Moon . Planets . ... Monthly Sky Notes . ... February . ... The ringed planet will be quite bright, but unlike Jupiter it will not be the brightest point of light in the sky, this accolade will return to Sirius which is the brightest star in our night sky in the constellation of Canis Major. ... Seven days later on February 18, the Moon will be in its full Moon phase. ... Tweets that mention Wonders of the February Night Sky | ... Astronotes . ...

Еще в разделе: (Показать все результаты (>2827) - www.armaghplanet.com/ )

• NGC4666: Secrets of a Starburst Galaxy | Astronotes
• Orion, mighty hunter of the winter sky | Astronotes
• M55 globular cluster seen by ESO | Astronotes

... 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 (>2753) - www.naic.edu/ )

• The Evolution of Galaxies Seen Through The Neutral Hydrogen Line The Evolution

... MOON OCCULTS PLEIADES, 23-24 FEBRUARY. ... known by different designations - don't worry if your PC programme or Atlas shows some of them with other Catalogue numbers STAR Mag Time V 624 Tau 8.2 E22.10 V 1187 Tau 8.3 E22.23 TYC 1803-188 E 8.1 E22.29 16 Tau 5.5 22.44 19 Tau 4.3 22.50 TYC 1799-306 E 8.5 E22.57 TYC 1803-104 E 8.9 E22.59 TYC 1799-184 E 7.2 E23.05 20 Tau 3.9 23.08 21 Tau 5.7 23.09 22 Tau 6.4 23.12 TYC 1804-2081 6.8 23.35 ... Clear Skies, Terry Moseley . ...

Еще в разделе: (Показать все результаты (>2663) - star.arm.ac.uk/ )

• Wonderful Moon - Venus Conjunction | International Year of Astronomy in Ireland
• JLE Dreyer
• Star Formation: How Well do We Understand it? - Wednesday 4 February |

Many intermediate-age star clusters in the Magellanic Clouds exhibit very unusual features in their colour-magnitude diagrams that suggest they may have formed their stars over periods spanning hundreds of millions of years per cluster. ... Nonetheless, this interpretation is enticing in the context of the formation of ancient globular clusters, which almost always exhibit puzzling abundance patterns that apparently require multiple episodes of star formation to explain. ...

Еще в разделе: (Показать все результаты (>584) - www.mso.anu.edu.au/ )

• http://www.mso.anu.edu.au/seminars/abstracts/20160211-1100.html
• http://www.mso.anu.edu.au/seminars/abstracts/20150804-1100.html
• http://www.mso.anu.edu.au/~bessell/thumbnails/images.txt

... STScI-PRC96-10 GRAVITATIONAL LENS CAPTURES IMAGE OF PRIMEVAL GALAXY This Hubble Space Telescope image shows several blue, loop-shaped objects that actually are multiple images of the same galaxy. ... CREDIT: W.N. Colley and E. Turner (Princeton University), J.A. Tyson (Bell Labs, Lucent Technologies) and NASA Image files in GIF and JPEG format and captions may be accessed on Internet via anonymous ftp from oposite.stsci.edu in /pubinfo. GIF JPEG PRC96-10 Grav. ...

Еще в разделе: (Показать все результаты (>8605) - www.arcetri.astro.it/ )

• APOD: February 21, 1996 - Millions of Stars in Omega Centauri
• APOD: May 22, 1996 - Star Cluster in the Rosette Nebula
• APOD: February 9, 1999 - A Supernova Starfield

... From the data taken during Cycle 1, surface brightness profiles have been obtained for 13 globular clusters in M31 (Fusi Pecci et al. 1993), leading also to the detection of a central cusp in a candidate post-core-collapse cluster (Bendinelli et al. ... Surface brightness profiles obtained with VISTA. ... PSF 512 512, data matrix smaller and smaller (256 256, 128 128, 64 64), sky = 0, RMG (Fig. 3b): the derived profiles remain unaffected a part from the reduction in radial extension. ...

Еще в разделе: (Показать все результаты (>13368) - www.stsci.edu/ )

• HST this week: 052
• HST this week: 057
• HST this week: 037

15m) Baerbel Koribalski (ATNF) "The HIPASS Bright Galaxy Survey" . ... 15m) Stuart Ryder (AAO) "HIPASS J0731-69: A New Tidal Feature in the NGC 2442 Group" . ... 15m) Meryl Waugh (U.Melbourne) "The Fornax Region: Searching for Clusters in HIPASS" . ... 15m) Martin Zwaan (U.Melbourne) "Constaints on the Space Density of Intragroup HI Clouds" . ... 15m) Lister Staveley-Smith (ATNF) "Mapping the Magellanic Stream" . ... 15m) Joss Bland-Hawthorn (AAO) "HIPASS HI clouds and the metagalactic UV field" . ...

Еще в разделе: (Показать все результаты (>6675) - www.atnf.csiro.au/ )

• ATNF Daily Astronomy Picture
• Evolutionary Paths in Galaxy Morphology
• AAO Colloquium - Ab Initio Globular Cluster System Formation

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. ...

Еще в разделе: (Показать все результаты (>299) - zebu.uoregon.edu/ )

• Low Surface Brightness Galaxy Gallery
• Astronomy HyperText Book
• Astro-2 and the UIT Experiment

... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... ESO Acronyms . ... Survey Telescopes . ... Galaxy Clusters . ... Star Clusters . ... Stars@ESO . ... ESO 3.6-metre telescope . ... This video pan sequence gives a close-up view of one of the brightest star clusters in the sky. This image from the Wide Field Imager on the MPG/ESO 2.2-metre telescope at ESOтАЩs La Silla Observatory in Chile, shows Messier 7, also known as NGC 6475. ... 180.0€аMB . ...

Еще в разделе: (Показать все результаты (>50434) - www.eso.org/ )

• Zooming in on the bright star cluster Messier 7 | ESO
• The location of the bright star cluster NGC 3532 in the constellation of Carina
• The bright star cluster NGC 6520 and the strangely shaped dark cloud Barnard 86

... DIGITAL EDITIONS . ... Tonight's Sky . ... The Magazine . ... Observing . ... 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 . ... February 2004 . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...

Еще в разделе: (Показать все результаты (>6723) - www.astronomy.com/ )

• February 2008 | Astronomy.com
• February 2003 | Astronomy.com
• February 2015 | Astronomy.com

... 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 (>171) - www.stecf.org/ )

• NICMOS/HST H-band (F160W) Images of the 30 Dor Starburst Cluster
• ESLAB 2007

... Ultraluminous X-ray sources (ULXs) are located in external galaxies, their X-ray luminosities (10 39 - 10 41 erg/s) are thousand times greater than those of brightest black holes in the Galaxy. ULXs may be supercritical accretion disks around black holes of stellar masses (~10 Solar masses) like that in SS433, or they may be a hypothetical intermediate-mass black holes (hundreds - thousands Solar masses) with standard accretion disks. ... 2) The ULX progenitors were ejected from the star clusters. ...

Еще в разделе: (Показать все результаты (>210) - mavr.sao.ru/ )

• important_en
• A unique isolated dwarf spheroidal galaxy KKR25
• Galaxy sector, archive 2012

... Non-NGC Images . ... Globular cluster in Scorpius (M80)..... image ..... caption . ... Globular cluster in Scorpius (M4)..... image ..... caption . ... Globular cluster in Oph (M107)..... image ..... caption . ... Nebula..... image . ... Globular cluster in Hercules (M13)..... image ..... caption . ... Globular cluster in Ophiuchus (M12)..... image ..... caption . ... Infrared-bright galaxy in Ophiuchus..... image ..... caption . ... Globular cluster in Ophiuchus (M10)..... image ..... caption . ...

Еще в разделе: (Показать все результаты (>1155) - www.astrosociety.org/ )

• ASP: Big Clusters, Tiny Galaxies
• ASP: Star Science in the Autumn Sky
• ASP: Sharing the Universe

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 (>403) - www.atmob.org/ )

• http://www.atmob.org/about/observing/awards/files/messier_catalog_2011-02-01.pdf
• http://www.atmob.org/library/member/skymaps/MAP7A.PDF
• Amateur Telescope Makers of Boston ATMoB Observing Awards Program

... Radio source identifications . The Web-server of the Special Astrophysical Observatory supports the mirror version of the Clusters of Galaxies database . At present only the data about radio sources in ACO clusters of galaxies are reasonably complete, while only restricted optical information is in our database. Later on, we also intend to include X-ray data and data about brightest cluster galaxies (BCG). ... ACO: radio optic ( for example, A0690 and " optic "), . ...

Еще в разделе: (Показать все результаты (>1036) - www.sao.ru/ )

• A 20 cm VLA survey of Abell clusters of galaxies
• Gravitational Lensing by Clusters of Galaxies
• A 1400-MHz Survey of 1478 Abell Clusters of Galaxies

Feb 28 2016 Cepheus - The King IC 455 5mm TV VF,VS,OVAL, NND ,R=F Galaxy S0 Nov 16 2012 18 IC 469 5mm TV Galaxy SAB(rs)ab: VF,VS,OVAL,VEXT, NND ,AV2,R=F Nov 16 2012 18 IC 1396 19mmW 25mmPL Open Cluster II3mn **STARS,BRIGHT, NICE DUST LANES,R=G DECENT NIGHT - MEGASTAR CONTROL Sep 07 2005 8 May 22 2004 8 NGC 40 7.5mmW 7.5mmW H58-4 MB,R,R=G Planetary Neb 3b+3 F,VS,R,VSMBM,*12SP Nov 11 2009 12 Oct 06 ... 13 Jul 24 2006 8" Aug 21 2004 8" PB,CS,R=F CLEAR SKIES - H.H. LITE. ...

Еще в разделе: (Показать все результаты (>388) - www.wro.org/ )

• http://www.wro.org/neumann/RNGC_by_Constellation-Aur.pdf
• http://www.wro.org/neumann/RNGC_List_by_Caldwell.pdf
• http://www.wro.org/neumann/RNGC_by_Caldwell.pdf

... This paper ( Burke et al. 2003 ) describes the creation of one such catalogue - the Southern Serendipitous High-redshift Archival ROSAT Cluster (SHARC) survey - which covers an area of 17.7 deg 2 and consists of 32 clusters with redshifts between 0.05 and 0.7 and X-ray luminosities between 7 x 10 42 and 4 x 10 44 erg/s: the high-redshift subsample contains 16 clusters with = 0.3 and X-ray luminosities greater than 2 x 10 43 erg/s (luminosities are quoted for the 0.5 - 2.0 keV energy band). ... 1997 ...

Еще в разделе: (Показать все результаты (>1579) - hea-www.harvard.edu/ )

• Doug Burke: Publications List
• The AstroStat Slog globular cluster
• The AstroStat Slog 2008 February

... 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. ...

Еще в разделе: (Показать все результаты (>352) - www.badastronomy.com/ )

• Phil Plait's Bad Astronomy: Misconceptions
• Phil Plait's Bad Astronomy: Bad TV