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Learn about the history, emblem, officers, and headquarters of the Order of the Eastern Star, a Masonic appendant body open to both men and women. The order has about 500,000 members under its General Grand Chapter, which is located in Washington, D.C.
A star catalogue is an astronomical catalogue that lists stars. Learn about the history and types of star catalogues from ancient and modern times, and how they are used for astronomy and navigation.
Learn about the origin and meaning of the five-pointed star, a common ideogram in modern culture. Find out how it is used in flags, emblems, coins, and other contexts, such as the yellow star of communism and the European Union.
The Guide Star Catalog II (GSC-II) was compiled by the Catalog and Surveys branch of the Space Telescope Science Institute and the astrometry team of the Astronomical Observatory of Torino (Italy). It has entries for 945,592,683 stars, and has positions, classifications, and magnitudes for 455,851,237 stars. The latest revision of this version ...
In contrast to the PPM, these older catalogs are based on (1) the now obsolete FK4 system of positions and proper motions, and (2) only two position measures per star. While the SAO catalog is more or less complete to V=9, with 4,503 stars fainter than V=10, the PPM catalog is fairly complete to V=9.5, with 102,672 stars fainter than V=10 and ...
The New General Catalogue (NGC) is an astronomical catalogue of deep-sky objects compiled by John Dreyer in 1888. It contains 7,840 objects, such as galaxies, star clusters and nebulae, and has several supplements and updates.
The Sun's spectral type is G2V, indicating a main-sequence star with a surface temperature around 5,800 K. Learn about the history, methods and systems of classifying stars based on their spectral characteristics.
In this case the ACT catalog was used, which had for example more stars and whereas the GSC 1.1 had 3rd order fit for plate distortions, the ACT has a five-order available. Another improvement of the GSC 1.1 was the GSC 1.2. GSC-ACT uses five classification codes: 1 Star; 2 Galaxy; 3 Non-Star; 4 Artefact; See also