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NGC 6559



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New infrared star clusters in the Northern and Equatorial Milky Way with 2MASS
We carried out a survey of infrared star clusters and stellar groups onthe 2MASS J, H and Ks all-sky release Atlas in the Northernand Equatorial Milky Way (350deg < l < 360deg, 0deg < l < 230 deg). Thesearch in this zone complements that in the Southern Milky Way (Dutra etal. \cite{Dutra03}a). The method concentrates efforts on the directionsof known optical and radio nebulae. The present study provides 167 newinfrared clusters, stellar groups and candidates. Combining the twostudies for the whole Milky Way, 346 infrared clusters, stellar groupsand candidates were discovered, whereas 315 objects were previouslyknown. They constitute an important new sample for future detailedstudies.

Glittering realms of the summer Milky Way.
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Diameters of Galactic globular clusters
All published aperture photometry of Galactic globular clusters has beenused to derive total magnitudes, V(t), and values of the diametercontaining half the cluster light in projection, D(0.5). For the 98globulars for which this information is available, cluster diameter isfound to correlate with Galactocentric distance. In this respect theGalactic globular cluster system resembles those associated with M31,NGC 5128, and the LMC, in which cluster diameters also increase withincreasing Galactocentric distance. The observed correlation D(0.5)proportional to sq. rt R suggests that compact clusters formedpreferentially from the dense gas clouds near the centers of galaxies,whereas more open clusters formed in the less dense halo regions ofgalaxies. Perhaps surprisingly, cluster diameter does not correlate withcluster luminosity (mass). Furthermore, cluster diameter does not appearto correlate with metallicity.

Spectrophotometric Studies of Galactic Nebulae - Part Twenty-Seven - MS:15 and NS:16 - High Excitation Planetary Nebulae
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The S201 far-ultraviolet imaging survey. III - A field in Sagittarius
Far-ultraviolet imagery of a 20 deg diameter field in Sagittarius,centered near (1950) R.A. 18 h 34 m, decl. -30 deg 25 arcmin, wasobtained by the S201 far-ultraviolet camera during the Apollo 16mission. In a 10-minute exposure covering the 1250-1600 A wavelengthrange, 1034 star images are detectable, with a limiting ultravioletmagnitude of about 10. Most of these objects are identified withearly-type stars listed in the Smithsonian Astrophysical ObservatoryStar Catalog, the Catalog of Stellar Identifications, or both, but 203objects remain unidentified or are identified with late-type stars. Thephotometric measurements appear to be in reasonable agreement with thoseof the International Ultraviolet Explorer for stars in common, and withexpectations for A0 stars. A detailed photometric study was made of theMessier 8 region, and it is concluded that dust-scattered starlightcontributes about half of the total radiation observed from the centralregion of M8.

Surveys of the galactic plane at 1.414, 2.695 and 5.000 GHz
Abstract image available at:http://adsabs.harvard.edu/abs/1970A&AS....1..319A

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Observation and Astrometry data

Right ascension:18h10m00.00s
Apparent magnitude:99.9

Catalogs and designations:
Proper Names   (Edit)
NGC 2000.0NGC 6559

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