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The Carte du Ciel (literally, 'Map of the Sky') and the Astrographic Catalogue (or Astrographic Chart) were two distinct but connected components of a massive international astronomical project, initiated in the late 19th century, to catalogue and map the positions of millions of
star A star is an astronomical object consisting of a luminous spheroid of plasma Plasma or plasm may refer to: Science * Plasma (physics), one of the four fundamental states of matter * Plasma (mineral) or heliotrope, a mineral aggregate * Quark ...

star
s as faint as 11th or 12th
magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...
. Twenty observatories from around the world participated in exposing and measuring more than 22,000 (glass) photographic plates in an enormous observing programme extending over several decades. Despite, or because of, its vast scale, the project was only ever partially successful – the Carte du Ciel component was never completed, and for almost half a century the Astrographic Catalogue part was largely ignored. However, the appearance of the
Hipparcos Catalogue ''Hipparcos'' was a scientific satellite In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such ...
in 1997 has led to an important development in the use of this historical plate material.


Origins and goals

A vast and unprecedented international star-mapping project was initiated in 1887 by
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Paris Observatory
director
Amédée Mouchez
Amédée Mouchez
, who realized the potential of the new dry plate photographic process to revolutionize the process of making maps of the stars. As a result of the Astrographic Congress of more than 50 astronomers held in Paris in April 1887, 20 observatories from around the world agreed to participate in the project, and two goals were established: For the first, the Astrographic Catalogue, the entire sky was to be photographed to 11 mag to provide a reference catalogue of star positions that would fill the magnitude gap between those previously observed by transit and meridian circle instrument observations down to 8 mag – this would provide the positions of a reasonably dense network of star positions which could in turn be used as a reference system for the fainter survey component (the Carte du Ciel). Different observatories around the world were charged with surveying specific declination zones (see table). The Astrographic Catalogue plates, of typically 6 minutes exposure, were in due course photographed, measured, and published in their entirety. They yielded a catalogue of positions and magnitudes down to about 11.5 mag, and the programme was largely completed during the first quarter of the 20th century. For the second goal, a second set of plates, with longer exposures but minimal overlap, was to photograph all stars to 14 mag. These plates were to be reproduced and distributed as a set of charts, the Carte du Ciel, in contrast to previous sky charts which had been constructed from the celestial coordinates of stars observed by transit instruments. Most of the Carte du Ciel plates used three exposures of 20 minutes duration, displaced to form an equilateral triangle with sides of 10 arcsec, making it easy to distinguish stars from plate flaws, and asteroids from stars. A fascinating contemporary account of this vast international astronomical collaboration, published in 1912, is given by
Herbert Hall Turner Herbert Hall Turner FRS FRS may also refer to: Government and politics * Facility Registry System, a centrally managed Environmental Protection Agency database that identifies places of environmental interest in the United States * Family Res ...
, then
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at Oxford University. Other aspects are covered in various papers in the Proceedings of IAU Symposium Number 133 held in 1988.


The Astrographic Catalogue

For the Astrographic Catalogue, 20 observatories from around the world participated in exposing and measuring more than 22,000 glass plates (see table). Around half of the observatories ordered telescopes from the Henry brothers (Paul and Prosper) in France, with others coming from the factory of Howard Grubb of Dublin. These telescopes were termed ''normal
astrograph observatory. File:Astrograph in Heidelberg-Königstuhl-2.jpg, The ''Bruce double astrograph'' at the Landessternwarte Heidelberg-Königstuhl observatory. An astrograph (or astrographic camera) is a telescope designed for the sole purpose of as ...
s'' with an aperture of around 13 inches (33 cm) and a focal length of 11 feet (3.4 m) designed to create images with a uniform scale on the photographic plate of approximately 60 arcsecs/mm while covering a 2° × 2° field of view. Each observatory was assigned a specific declination zone to photograph. The first such plate was taken in August 1891 at the
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Vatican Observatory
(where the exposures took more than 27 years to complete), and the last in December 1950 at the Ukkel Observatory (Brussels), with most observations being made between 1895 and 1920. To compensate for plate defects, each area of the sky was photographed twice, using a two-fold, corner-to-centre overlap pattern, extended at the zone boundaries, such that each observatory's plates would overlap with those of the adjacent zones. The participating observatories agreed to use a standardized telescope so that all plates had a similar scale of approximately 60 arcsec/mm. The measurable areas of the plates were 2.1°×2.1° (13 cm×13 cm), so the overlap pattern consisted of plates that were centred on every degree band in declination, but offset in right ascension by two degrees. Many factors, such as reference catalogue, reduction technique and print formats were left up to the individual institutions. The positional accuracy goal was 0.5 arcsec per image. Plate measurement was a protracted affair, with measuring done by eye and recorded by hand. The plates were turned over to a large number of semi-skilled "computers" to determine the positions of the stars on each plate. (Before its modern meaning, the word "computer" meant a person who performs calculations). The "computers" would manually measure each star with respect to the dozen or so reference stars within that particular plate, and then perform calculations to determine the star's
right ascension Right ascension (abbreviated RA; symbol ) is the angular distance of a particular point measured eastward along the celestial equator from the Sun at the equinox (celestial coordinates), March equinox to the (hour circle of the) point in questio ...

right ascension
and
declination In astronomy Astronomy (from el, ἀστρονομία, literally meaning the science that studies the laws of the stars) is a natural science that studies astronomical object, celestial objects and celestial event, phenomena. It uses math ...
. The original goal of 11 mag for the limiting magnitude was generally surpassed, however, with some observatories routinely measuring stars as faint as 13 mag. In total, some 4.6 million stars (8.6 million images) were observed. The brightest stars were over-exposed on the plates, not measured, and therefore missing in the resulting catalogues. The plate measurements (as rectangular coordinates), as well as the formulae to transform them to equatorial coordinates, were published in the original volumes of the Astrographic Catalogue, although the accompanying equatorial coordinates are now of only historical interest. Publication of the measurements proceeded from 1902 to 1964, and resulted in 254 printed volumes of raw data. For decades the Astrographic Catalogue was largely ignored. The data were difficult to work with because they were available neither in machine-readable form nor in equatorial coordinates. Decades of labour were expended internationally before the project was superseded by modern astronomical techniques. One problem was that the work took much longer than expected. As originally envisaged, the project was meant to have taken only 10 to 15 years. A more serious problem was that while many European astronomers were preoccupied with this project, which required steady, methodical labor rather than creativity, in other parts of the world notably the United States
astrophysics Astrophysics is a science that employs the methods and principles of physics in the study of astronomical objects and phenomena. Among the subjects studied are the Sun, other stars, galaxy, galaxies, extrasolar planets, the interstellar medium and ...
was becoming far more important than
astrometry in the optical wavelength range to determine precise positions of stars. ''Courtesy NASA/JPL-Caltech'' Astrometry is the branch of astronomy Astronomy (from el, ἀστρονομία, literally meaning the science that studies the laws of ...
. As a result, French astronomy in particular fell behind and lagged for decades.


The Carte du Ciel

The still-more-ambitious Carte du Ciel component of the programme was undertaken by some of the participating observatories, but neither completed nor even started by others. The charts proved to be excessively expensive to photograph and reproduce, generally via engraved copper plates (
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), and many zones were either not completed or properly published. The plates which were taken generally still exist, but cover only half of the sky. They are typically archived at their original observatories. A very few plates have recently been re-measured and re-analysed with the availability of the
Hipparcos Catalogue ''Hipparcos'' was a scientific satellite In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such ...
data (see below).


Combination of the Astrographic Catalogue with Hipparcos

The vast amount of work invested in the Astrographic Catalogue, taking plates, measuring, and publishing, looked for a long time as giving only a marginal scientific profit. But today, astronomers are very much indebted to this great effort because of the possibility of combining these century-old star positions with the results from ESA's
Hipparcos ''Hipparcos'' was a scientific satellite In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such ...
space astrometry satellite, allowing high accuracy proper motions to be derived for 2.5 million stars. Specifically, the Astrographic Catalogue positions were transferred from the decades-old printed catalogues into machine readable form (undertaken at the
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in Moscow under the leadership of A. Kuzmin) between 1987 and 1994. The data were then reduced anew (at the
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in Washington under the leadership of Sean Urban), using the reference stars measured by the
Hipparcos ''Hipparcos'' was a scientific satellite In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such ...
astrometry satellite. The stars from the
Hipparcos Catalogue ''Hipparcos'' was a scientific satellite In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such ...
were used to establish a detailed reference framework at the various epochs of the Astrographic Catalogue plates, while the 2.5 million stars in the Tycho-2 Catalogue provided a dense reference framework to allow the plate distortions to be accurately calibrated and corrected. The proper motions of all the Tycho Catalogue stars could then be derived especially thanks to the Astrographic Catalogue, but additionally using star positions from more than 140 other ground-based catalogues. Aside from the 120,000 stars of the Hipparcos Catalogue itself, the resulting Tycho-2 Catalogue (compiled at the Copenhagen University Observatory under the leadership of Erik Høg) is now the largest, most accurate and most complete, star catalogue of the brightest stars on the sky. It is currently the basis for deriving positions for all fainter stars on the sky. Sean Urban of the
US Naval Observatory The United States Naval Observatory (USNO) is one of the oldest agencies in the , with a primary mission to produce , and for the and the . The observatory is located in at the northwestern end of . It is one of the pre-1900 located in a ...
wrote in 1998:
''The history of the Astrographic Catalogue endeavour is one of dedicated individuals devoting tedious decades of their careers to a single goal. Some believe it is also the story of how the best European observatories of the 19th century lost their leadership in astronomical research by committing so many resources to this one undertaking. Long portrayed as an object lesson in overambition, the Astrographic Catalogue has more recently turned into a lesson in the way that old data can find new uses.''


References


Other Links

* for further details of the Australian contribution

IAU Commission 8 Working Group, includes a photograph of nuns measuring the Vatican plate collection (1910–1921)

Histoire de l'Observatoire de Toulouse (with a section on the Carte du Ciel)

A compilation of historical material by the Palermo Observatory {{DEFAULTSORT:Carte Du Ciel History of astronomy Astronomical catalogues Astronomical catalogues of stars Astronomical surveys Astrometry