By Erik Gregersen
The evening sky is definitely teeming with wonders, from superstar clusters and nebulae to quasars. Astronomy is the ability wherein those and different comparable phenomena are chanced on and saw. This stellar source strains the trail of recent astronomy, from preliminary efforts to map the heavens to todays use of high-tech telescopes and state-of-the-art units that support humans delve deeper into celestial discovery.
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Additional info for Astronomical Observations: Astronomy and the Study of Deep Space (An Explorer's Guide to the Universe)
When the German astronomers began the AGK2 in the 1920s, they ﬁrst required a fundamental reference system that by the following decade was deﬁned in the Dritter Fundamental-katalog des Berliner Astronomischen Jahrbuchs, or FK3. The Fourth Fundamental Catalogue (1963), or FK4, published by the Astronomisches Rechen-Institut in Heidelberg, contains data for 1,535 stars and has now superseded the FK3. Photometric Catalogs A complete mapping of the sky includes magnitudes (and colours) as well as positions and motions.
The Hipparcos catalog has positions for 118,218 stars that are accurate to 1 to 3 milliarcseconds. The Tycho-2 catalog is less accurate (10 to 100 milliarcseconds) but has positions for 2,539,913 stars. Fundamental Catalogs The measurements of accurate places for vast numbers of stars rests on painstakingly and independently determined positions of a few selected stars. A list of positions and proper motions for such selected stars well distributed over the sky is called a fundamental catalog, and its coordinate system is a close approximation to a ﬁxed frame of reference.
The deﬁnitive list of 88 constellations was established in 1930 under the authority of the International Astronomical Union. Its rectilinear constellation boundaries preserve the traditional arrangements of the naked-eye stars. The smallest of the constellations, Equuleus (“the Little Horse”) and Crux (“the [Southern] Cross”), nestle against constellations that are more than 10 times larger, Pegasus and Centaurus, respectively. The standard boundaries deﬁne an unambiguous constellation for each star.
Astronomical Observations: Astronomy and the Study of Deep Space (An Explorer's Guide to the Universe) by Erik Gregersen