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NGC 6866
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NGC 6866 (also Melotte 229, Collinder 412 and OCL 183) is a magnitude +7.6 open star cluster located 3900 light-years away in the constellation Cygnus. The cluster was discovered by German astronomer Caroline Herschel using a 10.7 cm (4.2 inch) 24x f/6 Newtonian reflector at Datchet, Berkshire, E...
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Messier 12
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Based on observations with ESO's Very Large Telescope, a team of Italian astronomers reports that the stellar cluster Messier 12 must have lost to our Milky Way galaxy close to one million low-mass stars.
"In the solar neighbourhood and in most stellar clusters, the least massive s...
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Recurrent Novae
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Title: Comprehensive Photometric Histories of All Known Galactic Recurrent Novae Authors: Bradley E. Schaefer (Louisiana State University) I collect virtually all photometry of the ten known galactic recurrent novae (RNe) and their 37 known eruptions. This consists of my modern measures of n...
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NGC 6772
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NGC 6772 (also IRAS 19119-0247 and PK 33-6.1) is a magnitude +12.7 planetary nebula located in the constellation Aquila. The planetary nebula was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Datchet, England on the 2...
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NGC 6751
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NGC 6751 (also IRAS 19032-0604, PK 029-05 1 and HD 177656) is a magnitude +11.9 planetary nebula located 6,500 light-years away in the constellation Aquila. The planetary nebula was discovered by German astronomer Albert Marth using a 121.92 cm (48 inch) reflector on the 20th July 1863. Right Asc...
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NGC 6775
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NGC 6775 is a group of stars located in the constellation Aquila. The asterism was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope on the 19th July 1828. Right Ascension 19h 16m 42.0s, Declination -00° 55' 58"
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NGC 6830
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NGC 6830 (also Collinder 406 and OCL 125) is a magnitude +7.9 open star cluster located in the constellation Vulpecula. The cluster was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Datchet, England on the 19th July 1784. Right Asc...
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NGC 6892
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NGC 6892 is a group of four stars located in the constellation Sagitta. The asterism was discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 19th July 1865. Right Ascension 20h 16m 57.1s, Declination +23 0...
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NGC 6735
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NGC 6735 is a magnitude +8.0 open star cluster located in the constellation Aquila. The cluster is near to the star SAO 142915. The cluster was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Slough, England on the 18th July 1827. Rig...
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NGC 6793
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NGC 6793 (also OCL 115) is a magnitude +11.5 open star cluster located 3,588 light-years away in the constellation Vulpecula. The cluster was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Slough, England on the 18th Ju...
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NGC 6938
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NGC 6938 is a group of stars located in the constellation Vulpecula. The stellar grouping was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Datchet, England on the 18th July 1784. Right Ascension 20h 34m 42.0s, Declina...
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RR Lyrae stars
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Title: Carbon-rich RR Lyr type stars Authors: George Wallerstein, V. V. Kovtyukh, S. M. Andrievsky We have derived CNO abundances in 12 RR Lyrae stars. Four stars show [C/Fe] near 0.0 and two stars show [C/Fe] = 0.52 and 0.65. Red giant branch stars, which are known to be the predecessors of RR Lyrae st...
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NGC 6823
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Title: The open cluster NGC6823 and possible triggered star formation associated with SNR G59.5+0.1 Authors: Jin-Long Xu, Jun-Jie Wang We investigate the environment in the vicinity of the supernova remnant (SNR) G59.5+0.1 and identify all young stellar objects (YSOs) around the SNR, to deriv...
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NGC 6834
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NGC 6834 (also Collinder 407, C 1950+292 and OCL 134) is a magnitude +7.8 open star cluster located 7,002 light-years away in the constellation Cygnus. The cluster was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Datc...
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NGC 6847
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NGC 6847 (also SH2-97) is a magnitude +13.0 star cloud located in the constellation Cygnus. The star cloud was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Datchet, England on the 17th July 1784. Right Ascension 19h 56...
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