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

Astronomy Picture of the Day . ... How do dying stars eject their outer layers? Stars that create elegant planetary nebulas like Henize 3-401, pictured above, are not unusual, causing speculation that, one day, our own Sun may look like this. A Star Cluster in Motion . ... A Setting Sun Trail . ... NGC 1569: Heavy Elements from a Small Galaxy . ... For the open cluster of stars NGC 6520, every day is like this. On the left of the above picture are many of NGC 6520's bright blue stars. ...

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... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... Globular cluster M28, open cluster M25, and planetary nebula NGC 6781 . August 20 27, 2015: Globular cluster M28 and open cluster M25 in Sagittarius offer small-telescope owners nice views, while large-telescope owners can seek out planetary nebula NGC 6781 in Aquila. ... Globular cluster M28 . ... Planetary nebula NGC 6781 . ...

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• A trio of open clusters in Cygnus, planetary nebula NGC 7139, and elliptical
• The Dish Cluster, the Pencil Nebula, and spiral galaxy NGC 2655 | Astronomy.com
• Two open clusters in Canis Major, emission nebula NGC 2316, and spiral galaxy

... GSAOI Home . ... Science . ... Deep imaging at J , H , and K is required to identify all stellar objects, brown dwarfs, and planetary mass objects in the central region of the Orion Nebula Cluster down to masses comparable to that of Jupiter. This is required to establish the initial mass function, i.e., the number of stars of each mass that have formed, in this region of intense massive star formation. ... The fields of the GSAOI detectors are shown as four green squares in each frame. ...

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Our team has obtained HST WFPC2 images of this prototypical example of a planetary nebula in a globular cluster. K 648 was cataloged as a star by Kustner, but identified spectroscopically as a planetary nebula by Pease, both in the 1920's. General WFPC2 view of M15 and K 648 (located near top left edge) . ... The nucleus is shown to have an unusually high mass of 0.60 Msun, and we argue that it must have undergone mass augmentation in a binary that has undergone mass transfer or a merger. ...

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• The Orion Nebula Cluster . as a Paradigm of Star Formation
• Dusty HII Regions and Planetary Nebulae
• HST this week

Feb 28 2016 Monoceros - The Unicorn IC 446 11mmT6 F,PATCH,R-F Nebula bipolar Dec 15 2004 8 IC 2172 11mmT6 F,S,R-F Non-Existent Nov 25 2006 8 NGC 2170 H19-4 Nebula R *9 INVF,PL,NEB,E170 Mar 28 2011 12 17mmAT SMALL, FAINT,IRREGULAR,R=F, OIII FILTER NGC 2182 11mmT6 H38-4 Nebula R PB**,L*NEB,E90 Mar 28 2011 12 VF,VS,IRREGULAR,R=F, OIII NGC 2183 ... 20 Mar 29 2006 8" PF,PS,R=F, NICE GROUP PGC 20274 11mmT6 VF,OVAL,NND,AV,R=G Galaxy IAB(s)m Dec 04 2004 8" Page 3 of 3 ...

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• http://www.wro.org/scodova/RNGC_by_Constellation-Vul.pdf
• http://www.wro.org/neumann/RNGC_by_Constellation-Vul.pdf
• http://www.wro.org/neumann/RNGC_by_Constellation-Aur.pdf

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• Types of Nebulae
• APOD: 2007 May 9 - The Snowflake Cluster versus the Cone Nebula
• APOD: 2002 March 17 - NGC 2244: A Star Cluster in the Rosette Nebula

... 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 . ...

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• ASP: Taking a Grand Virtual Voyage in the Milky Way

... May 22, 1996 . Star Cluster in the Rosette Nebula . ... Explanation: Embedded in the center of the colorful and photogenic Rosette Nebula is a bright, young open cluster . The bright blue stars in this cluster, labelled NGC 2244, emit ultraviolet light that knocks electrons away from hydrogen atoms . ... The Rosette Nebula is thousands of light years distant, but light would take only about 100 years to cross it. ... Tomorrow's picture: The Violent Star Cluster 30 Doradus . ... About APOD | ...

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• APOD: 2000 August 4 - M15: Dense Globular Star Cluster
• APOD: 2000 January 11 - The Rosette Nebula in Hydrogen, Oxygen, and Sulfur
• APOD: October 27, 1999 - In the Heart of the Tarantula Nebula

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• The star cluster and nebula NGC 371
• Star cluster NGC 6193 and nebula NGC 6188
• The Jewel Box cluster and the Coalsack Nebula

Astronotes Armagh Planetarium's Stellar Blog! ... Stars . ... Telescopes and Observatories . ... The majestic star-forming region in the Lagoon Nebula. The pale ring to the right is an internal reflection in the telescope.€а (Image credit: ESO/ VPHAS+/ V. Kalari and J. Vink (Armagh Observatory) . ... The 18 component images were further processed twice. ... Venu and his colleagues use images like this to identify individual young forming stars in the Lagoon Nebula and determine their ages. ...

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• Our Galaxy | Astronotes - Part 5
• stellar nursery | Astronotes - Part 2
• A Summer Night?s Stargazing | Astronotes

ATMoB Awards Program - Messier Marathon Worksheet Observer: Date: Instrument(s) Used: Location: Messier Observing Catalog/Worksheet Observing Order 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Messier Number M 77 M 74 M 33 M 31 M 32 M110 M 52 M103 M 76 M 34 M 45 M 79 M 42 M 43 M 78 M1 M 35 M 37 M 36 M 38 M 41 M 93 M 47 M 46 M 50 ...

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• http://www.atmob.org/library/member/skymaps/MAPKEY.PDF
• http://www.atmob.org/library/member/skymaps/MAP7A.PDF
• http://www.atmob.org/library/member/skymaps/MAP15.PDF

... NGC 2244 Rosette Cluster - рассеянное скопление Caldwell 50 (C50) у 12 Monocerotis (12 Mon) в созвездии Единорог (Monoceros) .. ... NGC 2244 Rosette Cluster - рассеянное скопление Caldwell 50 (C50) у 12 Monocerotis (12 Mon / open cluster near 12 Monocerotis) в созвездии Единорог (Monoceros (http://www.starlab.ru/showpost.php?p=149205&postcount=1)) .. ... NGC 2244 Rosette Cluster .: . ... Искомый кластер NGC 2244 Rosette Cluster (Collinder 99) будет находиться в 2.5? к югу (S) от 13 Monocerotis .. ...

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• Общая Астрономическая Конференция - Показать сообщение отдельно - NGC 2244
• Общая Астрономическая Конференция - Показать сообщение отдельно - Jewel Box -
• Трапеция Ориона (Trapezium, Orion Trapezium Cluster), Тета 1 Ориона (Theta 1

Intricately structured filaments of gas and dust compose the reflection nebula seen around the Pleiades star cluster. These multiwavelength images were presented to the American Astronomical Society meeting in San Antonio, TX on January 16, 1996. Click here for the press release text . ... The Schmidt data were processed further after this photo release; better versions are now available.] Get image: 512x512 (56k) / 1024x1024 (204k) . Pleiades Far-Infrared Heated Dust Emission . ...

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• The Pleiades
• Gas and Dust in the Pleiades Reflection Nebula
• Figures for Scattering Paper

M 13 2° 16h41m41s +36°27'39" N W Globular cluster Open cluster Asterism Galaxy 6207 M 13 3 4 5 6 7 8 9 10 11 12 13 Diffuse nebula Planetary nebula Supernova remnant Part of external galaxy

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• Ключевое слово ?Cluster?
• Stellarium: Nebula Class Reference

... Home Gallery Astrophotography Deep Sky Images by Joe DiNapoli . ... Deep Sky Images by Joe DiNapoli . ... Deep Sky Gallery by Ed Fox . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . Observing Resources for Amateur Astronomers - Part 2: Intermediate Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

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• Astro-Imaging ? Page 9 ? Amateur Astronomers Association of New York
• Michael Krypel Gallery ? Amateur Astronomers Association of New York

RED SEQUENCE DWARF GALAXIES IN CLUSTERS F. G. Kopylova and A.I. Kopylov Special astrophysical observatory, Russian Academy of Sciences Red sequence galaxies in clusters are an important population for understanding galaxy formation and evolution in general. ... To study the red sequence luminosity function and dwarf-to-giant ratio (DGR), we select 10 clusters of galaxies of the Leo Supercluster (z 0.035, D 150 · h-1 M pc) (Fig.1). ...

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• articles_alex_01
• A unique isolated dwarf spheroidal galaxy KKR25

... 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. ...

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• SAI OCL Catalog SAI 138
• SAI OCL Catalog King 13
• SAI OCL Catalog Ruprecht 68

... 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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• Index of /shared_skies/archive/select/unusual/coma_cluster/20120410
• Index of /shared_skies/archive/select/unusual/coma_cluster
• Shared Skies Photo Gallery

N NGC N Созв. ... C-1 NGC 188 Cep OC Open cluster 00h 44.4m +85 20' 8.1 14 C-2 NGC 40 Cep PN Planetary nebula 00h 13.0m +72 32' 12.4 0.6 C-3 NGC 4236 Dra SG Spiral galaxy 12h 16.7m +69 28' 9.7 19 x 7 C-4 NGC 7023 Cep BN Bright nebula 21h 01.8m +68 12' -- 18 x 18 Refl. nebula C-5 IC 342 Cam SG Spiral galaxy 03h 46.8m +68 06' 9.2 18 x 17 C-6 NGC 6543 Dra PN Planetary nebula 17h 58.6m +66 38' 8.1 5.8 Cat's Eye Neb. ... C-103 NGC 2070 Dor BN Bright nebula 05h 38.7m -69 06' -- 40 x 25 Tarantula Neb. ...

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