Tag: henry draper catalogue

Calendar: December 11

A Year: Day to Day Men; 11th of December

Handstand at Window

December 11 was the birthdate of American astronomer Annie Jump Cannon. 

Born in Dover, Delaware to Wilson Cannon, a shipbuilder, and Mary Jump, Annie Jump Cannon was encouraged by her mother to follow her own interests and suggested studies in chemistry, biology and mathematics at Wellesley College in Massachusetts. Taught by her mother to identify stars at an early age, Cannon decided to pursue her love of astronomy. She also made the choice not to marry or bear children. 

In 1880, Annie Cannon attended Wellesley College, one of the top academic schools for women, where she studied under Sarah Francis Whiting, one of the few women physicists in the United States at that time. Cannon graduated as the valedictorian of the college in 1884 with a degree in physics. She returned for a decade to Delaware where she developed skills in the new art of photography. Cannon traveled through Europe in 1892 taking photographs, later published along with her prose in a pamphlet, “In the Footsteps of Columbus”. This pamphlet was later used as a souvenir for the 1893 World’s Columbian Exposition in Chicago. 

Stricken with scarlet fever, Cannon became nearly deaf and immersed her self in her work. She became a junior physics teacher at Wellesley College in 1894 and took graduate courses in both physics and astronomy. In order to gain access to a more powerful telescope, Cannon enrolled at Radcliffe College as a special student; she was able to attend lectures by Harvard professors and gained access to the Harvard College Observatory. In 1896 Cannon was hired as an assistant to the observatory’s astronomer and physicist Edward C. Pickering. In 1907, she graduated with her Masters Degree from Wellesley in 1907. 

In 1896, Annine Cannon became a member of Pickering’s Harvard Computers, a group whose goal was to complete the Henry Draper Catalogue, a mapping and definition of every star in the sky to a photographic magnitude of nine. When Cannon first started cataloging stars, she was able to classify one- thousand stars in three years. By 1013, she was able to accurately classify two-hundred stars an hour by looking at their spectral patterns. 

Cannon is credited with the creation of the Harvard Classification Scheme, the first serious attempt to organize and classify stars based on their temperature and spectral types. She initially started by examining stars in the southern hemisphere and divided them into the spectral classes O, B, A, F, G, K, M based on the Balmer absorption lines that describe the spectral line emissions of the hydrogen atom. After this was understood, her initial classification system was rearranged to avoid updating previous star catalogues. 

In 1911, Annie Jump Cannon was made Curator of Astronomical Photographs at Harvard. Three years later, she became an honorary member of England’s Royal Astronomical Society. In 1922, the International Astronomical Society adopted Cannon’s classification system; except for a few minor changes, it is the basis of star classification to this date. Throughout her forty year career, Cannon manually classified more stars in a lifetime then anyone else, a total of approximately three-hundred and fifty thousand stars. 

Calendar: March 7

Year: Day to Day Men: March 7

Gold Pinstripes

The seventh of March in the year 1837 marks the birth date of American physician and amateur astronomer Henry Draper. Both a professor and Dean of Medicine at City University of New York, he was one of the pioneers in the field of astrophotography. 

Born to John William Draper, a professor at New York University, and Antonia Caetana de Paiva Pereira Gardner, daughter of the royal physician to the Emperor of Brazil, Henry Draper completed all his medical courses at the City University of New York’s School of Medicine by the age of twenty. Too young to graduate, he toured Europe for a year and became acquainted with the work of Irish astronomer William Parsons, Third Earl of Rosse. Draper’s interest in photography and the Earl of Rosse’s observatory would later become the basis of his career.

On his return from Europe, Draper received his Medical Degree and began working as a physician at Manhattan’s Bellevue Hospital. In 1860, he received appointment at the City University of New York as Professor of Natural Science. Draper joined the Twelfth New York Infantry Regiment’s S Company in May of 1862 as a surgeon during the Civil War. His brother, John Christopher Draper, joined him as an assistant surgeon; they served together as surgeons until October in 1862. Draper became Chairman of the Department of Physiology at City University in 1866.

Henry Draper met Mary Anna Palmer, the daughter of Connecticut merchant and real estate investor Courtlandt Palmer, and married her in 1867. A well-educated woman, Mary Anna Draper collaborated with her husband in his expeditions, research and photography. Upon her father’s death in 1872, she became heir, along with her three brothers, to her father’s fortune. Henry and Mary Anna Draper relocated to their summer home in Hastings-on-Hudson, New York, where they constructed an observatory with a 71 cm (28 inch) reflecting telescope and began a fifteen-year research partnership.

Interested in the application of photography to astronomy, Draper started making daguerrotypes of the sun and moon; however in 1872, he succeeded for the first time in photographing the stellar spectrum of the star Vega. Draper discovered in 1879 that the newly developed dry-photographic plates were more sensitive and convenient than the older wet-collodion ones. By 1882 with the use of the newer photographic plates, he was able to obtain over a hundred stellar spectra images, including those of the Moon, Mars, Jupiter (1880) and the Orion Nebula. Draper also succeeded in directly photographing the Orion Nebula, first in September of 1880 with a fifty-minute exposure and later with a one hundred-forty minute exposure though the use of a more accurate clock-driven telescope.

In 1882, Henry Draper resigned from City University to concentrate on his astrophotographic work for which he hoped to obtain higher resolution images. On the twentieth of November in 1882, Draper suffered an untimely death at the age of forty-five from double pleurisy, an inflammation of the membranes that surround the lungs and line the chest cavity. 

After his death, Mary Anna Draper funded the Henry Draper Award of the National Academy of Sciences  for outstanding contributions to astrophysics. She founded the Henry Draper Memorial Fund which financed the famous Henry Draper Catalogue, a nine-volume collection published between 1918 and 1924 that contains spectra details of two hundred twenty-five thousand stars. Draper’s donations enabled astronomer Edward Charles Pickering to continue his classification of stars based on their spectra. She also funded the construction of the Mount Wilson Observatory as well as ongoing research at the Harvard Observatory.