Date of Birth: 12/18/1903
Place of birth: Kazan
Born December 18, 1903 in Kazan in the family of the famous Russian astronomer, Kazan University professor Dmitri Ivanovich Dubyago (1849-1918). It is not surprising, therefore, that Alexander Dmitrievich early interest in astronomy; aged 12-13 years, he has observed the variable stars, and in the fourteen years he was one of the first to notice a new star in the constellation Aquila. The first paper prepared by AD Dubyago printing (probably under the guidance of his father), but the rest of the manuscript, was a description of a bright meteor which was observed in the vicinity of Kazan in the summer of 1918. The description was compiled from reports sent by the Kazan observatory. Labour activity Alexander Dmitrievich began very early. At the end of 1918 - after the death of his father, at the age of 15, he joined the staff of the Astronomical Observatory of the University of Kazan to the position calculator, which was responsible for time and service.
In 1920, Alexander D. entered the Physics and Mathematics Faculty of Kazan State University and a student with great love and energy continued to astronomy, mainly theoretical astronomy. At the same time, he showed himself as a skilled observer. AD Dubyago discovered two comets. The first of these was opened April 24, 1921 and was named the 1921 I (Dubiago) (in modern nomenclature C / 1921 H1 (Dubiago)). In the future, after the publication of the observations of this comet, AD Dubyago calculated the elliptical orbit of the comet, which happened a member of the family of Neptune with a period of 79.5 years.
October 14, 1923 Alexander D. discovered comet 1923 III (Bernard - Dubiago). Possessing excellent memory and extraordinary computing capabilities, Alexander D. from a young age, and until the last days of his life he loved to engage in calculations. In 1923 he published his first work on the study of comets movement. One of them contained the prediction of occurrence 6P / d`Arrest comet in 1923 .; in 1920, the comet had a close encounter with Jupiter, which greatly complicates the prediction. Other work has been devoted to the determination of the final orbit of the comet 1909 IV (Daniel). This large volume of work on the Alexander Dmitrievich proved delicate and demanding on the researcher himself. He again made a reduction of 188 comparison stars using inaccessible star catalogs, the position of these stars has led to a fundamental system of Boss and simultaneously determined the proper motions of stars 23. On the basis of the final elements of the comet`s orbit in 1909 AD IV Dubyago recalculate its ephemeris based on perturbations from Jupiter in 1916 and showed that in 1916, the comet was not found due to incorrectly calculated ephemeris, not in connection the poor conditions of its visibility, as in the time expected. As a student, Alexander Dmitrievich was completed and the first of the works associated with the comet Brooks. This comet was then "companion" Alexander Dmitrievich throughout his career.
After graduating from the University of Kazan in February 1925 by Alexander D. was an assistant at the Department of Astronomy and the rest of his life spent in the walls of the Kazan University, having risen from the calculator to the professor and the director of the Astronomical Observatory. Engelhardt at the University of Kazan.
For the prediction of the emergence of difficult business "of the comet Brooks" took Alexander Dmitrievich in 1925. Prior to that, in 1922, the comet passed Jupiter last action area is very uncertain observation it was made in 1910, and in 1918 at the next appearance of a comet It was not observed due to unfavorable conditions of its visibility. In 1925, under the new appearance of the comet`s chances of finding it was not great, but it was found in the photographs obtained in September 1925 in Simeiz. The successful solution of the problem posed by AD Dubyago was ensured by the fact that he very carefully approached the selection of the initial elements for the prediction of the beginning. In carrying out this work, Alexander D. came to the opinion of the importance of studying the movements of this is in many ways remarkable comets and dedicated to her some of its future work.
A study of the orbit of the comet Brooks Baushinger first started, but his work remained unfinished. In 1928, Alexander D. appealed to Baushinger inform him some unpublished material relating to the comet Brooks. Baushinger in a letter dated November 17, 1928 reported that he had in 1911 at the suspected comet Brooks secular acceleration, and expressed the hope that Alexander Dmitrievich bring this work to the end. However, Alexander D., holding motion study of a comet Brooks put a deeper problem - not only to establish the secular acceleration, but also to find out the reasons causing it. The study of motion Brooks comet during its three first appearances and rapprochement with Jupiter in 1886 was engaged in Pur, but his calculations were errors distort the motion of the comet. AD Dubyago performed again the hard work and above all subjected to a thorough revision of all the observations of the comet during its poyav