iau constellation boundaries

iau constellation boundaries插图

Definition of constellationboundaries by the IAU. The celestial sphere is conventionally divided into 88 regions,called constellations,whose boundaries have been standardized in 1930 on behalf of the International Astronomical Union by the Belgian astronomer Eugne Delporte. The edges of each constellation boundary are segments of meridians of right ascension and parallels of declination in the equatorial coordinate system relative to the equinox B1875.0.

What are constellation boundaries?

Definition of constellation boundaries by the IAU. The celestial sphere is conventionally divided into 88 regions, called constellations, whose boundaries have been standardized in 1930 on behalf of the International Astronomical Union by the Belgian astronomer Eugne Delporte.

How are constellations defined?

IAU and the 88 Constellations Originally the constellations were defined informally by the shapes made by their star patterns, but, as the pace of celestial discoveries quickened in the early 20th century, astronomers decided it would be helpful to have an official set of constellation boundaries.

What is the format of the chart of the constellations?

Chart in PDF format, to be printed in A4 format. A text file containing a set of coordinates that defines the boundaries of the constellations in the sky. The format is: COVINGTON, M. A. Celestial Objects for Modern Telescopes .Cambridge University Press, 2002. pp. 80-84.

What are the abbreviations of the constellation names?

The IAU adopted three-letter abbreviations of the constellation names at its inaugural General Assembly in Rome in 1922. So, for instance, Andromeda is abbreviated to And whilst Draco is abbreviated to Dra.

How many constellations did Eugène Delporte list?

Eugène Delporte originally listed the 88 “modern” constellations on behalf of the IAU Commission 3 (Astronomical Notations), in Délimitation scientifique des constellations. (Delporte, 1930)

Why are constellations important?

One reason was to aid in the naming of new variable stars, which brighten and fade rather than shine steadily. Such stars are named for the constellation in which they reside, so it is important to agree where one constellation ends and the next begins.#N#Eugène Delporte originally listed the 88 “modern” constellations on behalf of the IAU Commission 3 (Astronomical Notations), in Délimitation scientifique des constellations. (Delporte, 1930)

How many constellations are there in the IAU?

Over half of the 88 constellations the IAU recognizes today are attributed to ancient Greek, which consolidated the earlier works by the ancient Babylonian, Egyptian and Assyrian. Forty eight of the constellations we know were recorded in the seventh and eighth books of Claudius Ptolemy’s Almagest, although the exact origin …

What is the name of the brightest star in the constellation Aries?

For instance, Hamal, the brightest star in the constellation Aries (nominative form), is also called Alpha Arietis (genitive form), meaning literally “the alpha of Aries”. The Latin names of all the constellations, their abbreviated names and boundaries can be found in the table below.

When were the first constellations recorded?

Our ancestors may have recorded their view of the night sky on the walls of their cave some 17 300 years ago. It is thought that the Pleiades star cluster is represented alongside the nearby cluster of the Hyades. Was the first ever depiction of a star pattern made over seventeen millennia ago? (Rappenglück 1996)

What is the origin of constellations?

Origin of the Constellations. Ever since people first wandered the Earth, great significance has been given to the celestial objects seen in the sky. Throughout human history and across many different cultures, names and mythical stories have been attributed to the star patterns in the night sky, thus giving birth to what we know as constellations. …

Is there a correct way to pronounce constellations?

There is no single correct way of pronouncing a constellation name , and there are several sources that address the issue. (See also Covington (2002), Davis (1942), The American Heritage Dictionary of the English Language). See for instance: Sky&Telescope web page on constellations names and pronunciation.

What is the name of the brightest star in the constellation Aries?

For instance, Hamal, the brightest star in the constellation Aries(nominative form), is also called Alpha Arietis(genitive form), meaning literally “the alpha of Aries”.

Why are constellations named after stars?

Such stars are named for the constellation in which they reside, so it is important to agree where one constellation ends and the next begins.

How many constellations did Eugène Delporte list?

Eugène Delporte originally listed the 88 “modern” constellations on behalf of the IAU Commission 3 (Astronomical Notations), in Délimitation scientifique des constellations. (Delporte, 1930)

What format is a chart for printing?

Chart for printing (PDF in A4 format)

When were the first constellations recorded?

Our ancestors may have recorded their view of the night sky on the walls of their cave some 17 300 years ago. It is thought that the Pleiades star cluster is represented alongside the nearby cluster of the Hyades. Was the first ever depiction of a star pattern made over seventeen millennia ago? (Rappenglück 1996)

Who discovered the constellations?

Forty eight of the constellations we know were recorded in the seventh and eighth books of Claudius Ptolemy ’s Almagest, although the exact origin of these constellations still remains uncertain. Ptolemy’s descriptions are probably strongly influenced by the work of Eudoxus of Knidos in around 350 BC. Between the 16th and 17th century AD, European astronomers and celestial cartographers added new constellations to the 48 previously described by Ptolemy; these new constellations were mainly “new discoveries” made by the Europeans who first explored the southern hemisphere. Those who made particular contributions to the “new” constellations include the German astronomer Johannes Hevelius; three Dutch cartographers, Frederick de Houtman, Pieter Dirksz Keyser and Gerard Mercator; the French astronomer Nicolas Louis de Lacaille; the Flemish mapmaker Petrus Plancius and the Italian navigator Amerigo Vespucci.